mirror of
https://github.com/kerberos-io/openalpr-base.git
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Added OpenALPR library
This commit is contained in:
Matt Hill
447
src/openalpr/platecorners.cpp
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447
src/openalpr/platecorners.cpp
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/*
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* Copyright (c) 2013 New Designs Unlimited, LLC
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* Opensource Automated License Plate Recognition [http://www.openalpr.com]
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*
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* This file is part of OpenAlpr.
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*
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* OpenAlpr is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License
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* version 3 as published by the Free Software Foundation
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "platecorners.h"
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PlateCorners::PlateCorners(Mat inputImage, PlateLines* plateLines, CharacterRegion* charRegion, Config* config)
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{
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this->config = config;
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if (this->config->debugPlateCorners)
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cout << "PlateCorners constructor" << endl;
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this->inputImage = inputImage;
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this->plateLines = plateLines;
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this->charRegion = charRegion;
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this->bestHorizontalScore = 9999999999999;
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this->bestVerticalScore = 9999999999999;
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Point topPoint = charRegion->getTopLine().midpoint();
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Point bottomPoint = charRegion->getBottomLine().closestPointOnSegmentTo(topPoint);
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this->charHeight = distanceBetweenPoints(topPoint, bottomPoint);
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//this->charHeight = distanceBetweenPoints(charRegion->getCharArea()[0], charRegion->getCharArea()[3]);
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//this->charHeight = this->charHeight - 2; // Adjust since this height is a box around our char.
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// Adjust the char height for the difference in size...
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//this->charHeight = ((float) inputImage.size().height / (float) TEMPLATE_PLATE_HEIGHT) * this->charHeight;
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this->charAngle = angleBetweenPoints(charRegion->getCharArea()[0], charRegion->getCharArea()[1]);
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}
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PlateCorners::~PlateCorners()
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{
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}
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vector<Point> PlateCorners::findPlateCorners()
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{
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if (this->config->debugPlateCorners)
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cout << "PlateCorners::findPlateCorners" << endl;
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timespec startTime;
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getTime(&startTime);
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int horizontalLines = this->plateLines->horizontalLines.size();
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int verticalLines = this->plateLines->verticalLines.size();
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// layout horizontal lines
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for (int h1 = NO_LINE; h1 < horizontalLines; h1++)
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{
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for (int h2 = NO_LINE; h2 < horizontalLines; h2++)
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{
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if (h1 == h2 && h1 != NO_LINE) continue;
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this->scoreHorizontals(h1, h2);
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}
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}
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// layout vertical lines
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for (int v1 = NO_LINE; v1 < verticalLines; v1++)
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{
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for (int v2 = NO_LINE; v2 < verticalLines; v2++)
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{
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if (v1 == v2 && v1 != NO_LINE) continue;
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this->scoreVerticals(v1, v2);
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}
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}
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if (this->config->debugPlateCorners)
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{
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cout << "Drawing debug stuff..." << endl;
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Mat imgCorners = Mat(inputImage.size(), inputImage.type());
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inputImage.copyTo(imgCorners);
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for (int i = 0; i < 4; i++)
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circle(imgCorners, charRegion->getCharArea()[i], 2, Scalar(0, 0, 0));
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line(imgCorners, this->bestTop.p1, this->bestTop.p2, Scalar(255, 0, 0), 1, CV_AA);
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line(imgCorners, this->bestRight.p1, this->bestRight.p2, Scalar(0, 0, 255), 1, CV_AA);
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line(imgCorners, this->bestBottom.p1, this->bestBottom.p2, Scalar(0, 0, 255), 1, CV_AA);
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line(imgCorners, this->bestLeft.p1, this->bestLeft.p2, Scalar(255, 0, 0), 1, CV_AA);
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displayImage(config, "Winning top/bottom Boundaries", imgCorners);
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}
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// Check if a left/right edge has been established.
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if (bestLeft.p1.x == 0 && bestLeft.p1.y == 0 && bestLeft.p2.x == 0 && bestLeft.p2.y == 0)
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confidence = 0;
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else if (bestTop.p1.x == 0 && bestTop.p1.y == 0 && bestTop.p2.x == 0 && bestTop.p2.y == 0)
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confidence = 0;
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else
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confidence = 100;
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vector<Point> corners;
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corners.push_back(bestTop.intersection(bestLeft));
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corners.push_back(bestTop.intersection(bestRight));
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corners.push_back(bestBottom.intersection(bestRight));
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corners.push_back(bestBottom.intersection(bestLeft));
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if (config->debugTiming)
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{
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timespec endTime;
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getTime(&endTime);
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cout << "Plate Corners Time: " << diffclock(startTime, endTime) << "ms." << endl;
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}
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return corners;
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}
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void PlateCorners::scoreVerticals(int v1, int v2)
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{
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float score = 0; // Lower is better
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LineSegment left;
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LineSegment right;
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float charHeightToPlateWidthRatio = config->plateWidthMM / config->charHeightMM;
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float idealPixelWidth = this->charHeight * (charHeightToPlateWidthRatio * 1.05); // Add 10% so we don't clip any characters
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if (v1 == NO_LINE && v2 == NO_LINE)
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{
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//return;
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Point centerTop = charRegion->getCharBoxTop().midpoint();
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Point centerBottom = charRegion->getCharBoxBottom().midpoint();
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LineSegment centerLine = LineSegment(centerBottom.x, centerBottom.y, centerTop.x, centerTop.y);
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left = centerLine.getParallelLine(idealPixelWidth / 2);
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right = centerLine.getParallelLine(-1 * idealPixelWidth / 2 );
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score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL * 2;
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}
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else if (v1 != NO_LINE && v2 != NO_LINE)
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{
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left = this->plateLines->verticalLines[v1];
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right = this->plateLines->verticalLines[v2];
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}
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else if (v1 == NO_LINE && v2 != NO_LINE)
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{
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right = this->plateLines->verticalLines[v2];
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left = right.getParallelLine(idealPixelWidth);
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score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL;
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}
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else if (v1 != NO_LINE && v2 == NO_LINE)
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{
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left = this->plateLines->verticalLines[v1];
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right = left.getParallelLine(-1 * idealPixelWidth);
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score += SCORING_MISSING_SEGMENT_PENALTY_VERTICAL;
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}
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// Make sure this line is to the left of our license plate letters
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if (left.isPointBelowLine(charRegion->getCharBoxLeft().midpoint()) == false)
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return;
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// Make sure this line is to the right of our license plate letters
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if (right.isPointBelowLine(charRegion->getCharBoxRight().midpoint()))
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return;
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/////////////////////////////////////////////////////////////////////////
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// Score "Distance from the edge...
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/////////////////////////////////////////////////////////////////////////
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float leftDistanceFromEdge = abs((float) (left.p1.x + left.p2.x) / 2);
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float rightDistanceFromEdge = abs(this->inputImage.cols - ((float) (right.p1.x + right.p2.x) / 2));
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float distanceFromEdge = leftDistanceFromEdge + rightDistanceFromEdge;
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score += distanceFromEdge * SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT;
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/////////////////////////////////////////////////////////////////////////
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// Score "Boxiness" of the 4 lines. How close is it to a parallelogram?
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/////////////////////////////////////////////////////////////////////////
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float verticalAngleDiff = abs(left.angle - right.angle);
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score += (verticalAngleDiff) * SCORING_BOXINESS_WEIGHT;
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//////////////////////////////////////////////////////////////////////////
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// SCORE the shape wrt character position and height relative to position
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//////////////////////////////////////////////////////////////////////////
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Point leftMidLinePoint = left.closestPointOnSegmentTo(charRegion->getCharBoxLeft().midpoint());
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Point rightMidLinePoint = right.closestPointOnSegmentTo(charRegion->getCharBoxRight().midpoint());
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float plateDistance = abs(idealPixelWidth - distanceBetweenPoints(leftMidLinePoint, rightMidLinePoint));
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score += plateDistance * SCORING_VERTICALDISTANCE_WEIGHT;
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if (score < this->bestVerticalScore)
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{
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float scorecomponent;
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if (this->config->debugPlateCorners)
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{
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cout << "xx xx Score: charHeight " << this->charHeight << endl;
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cout << "xx xx Score: idealwidth " << idealPixelWidth << endl;
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cout << "xx xx Score: v1,v2= " << v1 << "," << v2 << endl;
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cout << "xx xx Score: Left= " << left.str() << endl;
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cout << "xx xx Score: Right= " << right.str() << endl;
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cout << "Vertical breakdown Score:" << endl;
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cout << " -- Boxiness Score: " << verticalAngleDiff << " -- Weight (" << SCORING_BOXINESS_WEIGHT << ")" << endl;
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scorecomponent = verticalAngleDiff * SCORING_BOXINESS_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Distance From Edge Score: " << distanceFromEdge << " -- Weight (" << SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT << ")" << endl;
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scorecomponent = distanceFromEdge * SCORING_VERTICALDISTANCE_FROMEDGE_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Distance Score: " << plateDistance << " -- Weight (" << SCORING_VERTICALDISTANCE_WEIGHT << ")" << endl;
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scorecomponent = plateDistance * SCORING_VERTICALDISTANCE_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Score: " << score << endl;
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}
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this->bestVerticalScore = score;
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bestLeft = LineSegment(left.p1.x, left.p1.y, left.p2.x, left.p2.y);
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bestRight = LineSegment(right.p1.x, right.p1.y, right.p2.x, right.p2.y);
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}
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}
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// Score a collection of lines as a possible license plate region.
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// If any segments are missing, extrapolate the missing pieces
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void PlateCorners::scoreHorizontals(int h1, int h2)
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{
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//if (this->debug)
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// cout << "PlateCorners::scorePlate" << endl;
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float score = 0; // Lower is better
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LineSegment top;
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LineSegment bottom;
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float charHeightToPlateHeightRatio = config->plateHeightMM / config->charHeightMM;
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float idealPixelHeight = this->charHeight * charHeightToPlateHeightRatio;
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if (h1 == NO_LINE && h2 == NO_LINE)
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{
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// return;
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Point centerLeft = charRegion->getCharBoxLeft().midpoint();
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Point centerRight = charRegion->getCharBoxRight().midpoint();
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LineSegment centerLine = LineSegment(centerLeft.x, centerLeft.y, centerRight.x, centerRight.y);
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top = centerLine.getParallelLine(idealPixelHeight / 2);
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bottom = centerLine.getParallelLine(-1 * idealPixelHeight / 2 );
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score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL * 2;
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}
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else if (h1 != NO_LINE && h2 != NO_LINE)
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{
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top = this->plateLines->horizontalLines[h1];
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bottom = this->plateLines->horizontalLines[h2];
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}
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else if (h1 == NO_LINE && h2 != NO_LINE)
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{
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bottom = this->plateLines->horizontalLines[h2];
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top = bottom.getParallelLine(idealPixelHeight);
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score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL;
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}
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else if (h1 != NO_LINE && h2 == NO_LINE)
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{
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top = this->plateLines->horizontalLines[h1];
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bottom = top.getParallelLine(-1 * idealPixelHeight);
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score += SCORING_MISSING_SEGMENT_PENALTY_HORIZONTAL;
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}
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// Make sure this line is above our license plate letters
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if (top.isPointBelowLine(charRegion->getCharBoxTop().midpoint()) == false)
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return;
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// Make sure this line is below our license plate letters
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if (bottom.isPointBelowLine(charRegion->getCharBoxBottom().midpoint()))
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return;
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// We now have 4 possible lines. Let's put them to the test and score them...
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/////////////////////////////////////////////////////////////////////////
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// Score "Boxiness" of the 4 lines. How close is it to a parallelogram?
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/////////////////////////////////////////////////////////////////////////
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float horizontalAngleDiff = abs(top.angle - bottom.angle);
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score += (horizontalAngleDiff) * SCORING_BOXINESS_WEIGHT;
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// if (this->debug)
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// cout << "PlateCorners boxiness score: " << (horizontalAngleDiff + verticalAngleDiff) * SCORING_BOXINESS_WEIGHT << endl;
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//////////////////////////////////////////////////////////////////////////
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// SCORE the shape wrt character position and height relative to position
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//////////////////////////////////////////////////////////////////////////
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Point topPoint = top.midpoint();
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Point botPoint = bottom.closestPointOnSegmentTo(topPoint);
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float plateHeightPx = distanceBetweenPoints(topPoint, botPoint);
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// Get the height difference
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float heightRatio = charHeight / plateHeightPx;
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float idealHeightRatio = (config->charHeightMM / config->plateHeightMM);
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//if (leftRatio < MIN_CHAR_HEIGHT_RATIO || leftRatio > MAX_CHAR_HEIGHT_RATIO || rightRatio < MIN_CHAR_HEIGHT_RATIO || rightRatio > MAX_CHAR_HEIGHT_RATIO)
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float heightRatioDiff = abs(heightRatio - idealHeightRatio);
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// Ideal ratio == ~.45
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// Get the distance from the top and the distance from the bottom
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// Take the average distances from the corners of the character region to the top/bottom lines
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// float topDistance = distanceBetweenPoints(topMidLinePoint, charRegion->getCharBoxTop().midpoint());
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// float bottomDistance = distanceBetweenPoints(bottomMidLinePoint, charRegion->getCharBoxBottom().midpoint());
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// float idealTopDistance = charHeight * (TOP_WHITESPACE_HEIGHT_MM / CHARACTER_HEIGHT_MM);
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// float idealBottomDistance = charHeight * (BOTTOM_WHITESPACE_HEIGHT_MM / CHARACTER_HEIGHT_MM);
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// float distScore = abs(topDistance - idealTopDistance) + abs(bottomDistance - idealBottomDistance);
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score += heightRatioDiff * SCORING_PLATEHEIGHT_WEIGHT;
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//////////////////////////////////////////////////////////////////////////
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// SCORE the middliness of the stuff. We want our top and bottom line to have the characters right towards the middle
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//////////////////////////////////////////////////////////////////////////
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Point charAreaMidPoint = charRegion->getCharBoxLeft().midpoint();
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Point topLineSpot = top.closestPointOnSegmentTo(charAreaMidPoint);
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Point botLineSpot = bottom.closestPointOnSegmentTo(charAreaMidPoint);
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float topDistanceFromMiddle = distanceBetweenPoints(topLineSpot, charAreaMidPoint);
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float bottomDistanceFromMiddle = distanceBetweenPoints(topLineSpot, charAreaMidPoint);
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float idealDistanceFromMiddle = idealPixelHeight / 2;
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float middleScore = abs(topDistanceFromMiddle - idealDistanceFromMiddle) + abs(bottomDistanceFromMiddle - idealDistanceFromMiddle);
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score += middleScore * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT;
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// if (this->debug)
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// {
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// cout << "PlateCorners boxiness score: " << avgRatio * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT << endl;
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// cout << "PlateCorners boxiness score: " << distScore * SCORING_PLATEHEIGHT_WEIGHT << endl;
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// }
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//////////////////////////////////////////////////////////////
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// SCORE: the shape for angles matching the character region
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//////////////////////////////////////////////////////////////
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float charanglediff = abs(charAngle - top.angle) + abs(charAngle - bottom.angle);
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score += charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT;
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// if (this->debug)
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// cout << "PlateCorners boxiness score: " << charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT << endl;
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if (score < this->bestHorizontalScore)
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{
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float scorecomponent;
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if (this->config->debugPlateCorners)
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{
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cout << "xx xx Score: charHeight " << this->charHeight << endl;
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cout << "xx xx Score: idealHeight " << idealPixelHeight << endl;
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cout << "xx xx Score: h1,h2= " << h1 << "," << h2 << endl;
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cout << "xx xx Score: Top= " << top.str() << endl;
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cout << "xx xx Score: Bottom= " << bottom.str() << endl;
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cout << "Horizontal breakdown Score:" << endl;
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cout << " -- Boxiness Score: " << horizontalAngleDiff << " -- Weight (" << SCORING_BOXINESS_WEIGHT << ")" << endl;
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scorecomponent = horizontalAngleDiff * SCORING_BOXINESS_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Height Ratio Diff Score: " << heightRatioDiff << " -- Weight (" << SCORING_PLATEHEIGHT_WEIGHT << ")" << endl;
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scorecomponent = heightRatioDiff * SCORING_PLATEHEIGHT_WEIGHT;
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cout << " -- -- " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Distance Score: " << middleScore << " -- Weight (" << SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT << ")" << endl;
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scorecomponent = middleScore * SCORING_TOP_BOTTOM_SPACE_VS_CHARHEIGHT_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Char angle Score: " << charanglediff << " -- Weight (" << SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT << ")" << endl;
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scorecomponent = charanglediff * SCORING_ANGLE_MATCHES_LPCHARS_WEIGHT;
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cout << " -- -- Score: " << scorecomponent << " = " << scorecomponent / score * 100 << "% of score" << endl;
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cout << " -- Score: " << score << endl;
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}
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this->bestHorizontalScore = score;
|
||||
bestTop = LineSegment(top.p1.x, top.p1.y, top.p2.x, top.p2.y);
|
||||
bestBottom = LineSegment(bottom.p1.x, bottom.p1.y, bottom.p2.x, bottom.p2.y);
|
||||
}
|
||||
|
||||
|
||||
|
||||
}
|
||||
Reference in New Issue
Block a user