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Added per-line values for character height.

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Helps support multiline plates with different heights on each line
This commit is contained in:
Matt Hill
2015-09-20 21:11:14 -04:00
parent 75c6784369
commit 8d765d481d
8 changed files with 66 additions and 41 deletions
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39
src/openalpr/textdetection/characteranalysis.cpp
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@@ -338,7 +338,19 @@ namespace alpr
// Goes through the contours for the plate and picks out possible char segments based on min/max height
void CharacterAnalysis::filterByBoxSize(TextContours& textContours, int minHeightPx, int maxHeightPx)
{
float idealAspect=config->charWidthMM / config->charHeightMM;
// For multiline plates, we want to target the biggest line for character analysis, since it should be easier to spot.
float larger_char_height_mm = 0;
float larger_char_width_mm = 0;
for (unsigned int i = 0; i < config->charHeightMM.size(); i++)
{
if (config->charHeightMM[i] > larger_char_height_mm)
{
larger_char_height_mm = config->charHeightMM[i];
larger_char_width_mm = config->charWidthMM[i];
}
}
float idealAspect=larger_char_width_mm / larger_char_height_mm;
float aspecttolerance=0.25;
@@ -619,31 +631,6 @@ namespace alpr
return false;
}
bool CharacterAnalysis::verifySize(Mat r, float minHeightPx, float maxHeightPx)
{
//Char sizes 45x90
float aspect=config->charWidthMM / config->charHeightMM;
float charAspect= (float)r.cols/(float)r.rows;
float error=0.35;
//float minHeight=TEMPLATE_PLATE_HEIGHT * .35;
//float maxHeight=TEMPLATE_PLATE_HEIGHT * .65;
//We have a different aspect ratio for number 1, and it can be ~0.2
float minAspect=0.2;
float maxAspect=aspect+aspect*error;
//area of pixels
float area=countNonZero(r);
//bb area
float bbArea=r.cols*r.rows;
//% of pixel in area
float percPixels=area/bbArea;
//if(DEBUG)
//cout << "Aspect: "<< aspect << " ["<< minAspect << "," << maxAspect << "] " << "Area "<< percPixels <<" Char aspect " << charAspect << " Height char "<< r.rows << "\n";
if(percPixels < 0.8 && charAspect > minAspect && charAspect < maxAspect && r.rows >= minHeightPx && r.rows < maxHeightPx)
return true;
else
return false;
}
vector<Point> CharacterAnalysis::getCharArea(LineSegment topLine, LineSegment bottomLine)
{