dockerfile/openalpr-base
1
0
Fork 0
mirror of https://github.com/kerberos-io/openalpr-base.git synced 2025-10-06 05:46:51 +08:00
Code Issues Packages Projects Releases Wiki Activity

Improved binarization speed by ~15% with no change in output. Re-using row pointers as opposed to x,y getters/setters.

Browse Source
This commit is contained in:
Matt Hill
2014-04-07 20:42:26 -05:00
parent 21982b246b
commit 947fb939ce
1 changed files with 46 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

67
src/openalpr/binarize_wolf.cpp
View File

@@ -53,21 +53,28 @@ float calcLocalStats (Mat &im, Mat &map_m, Mat &map_s, int winx, int winy)
max_s = 0;
for (int j = y_firstth ; j<=y_lastth; j++)
{
float* mapm_rowdata = map_m.ptr<float>(j);
float* maps_rowdata = map_s.ptr<float>(j);
// Calculate the initial window at the beginning of the line
sum = sum_sq = 0;
for (int wy=0 ; wy<winy; wy++)
{
uchar* imdatarow = im.ptr<uchar>(j-wyh+wy);
for (int wx=0 ; wx<winx; wx++)
{
foo = im.uget(wx,j-wyh+wy);
foo = imdatarow[wx];
sum += foo;
sum_sq += foo*foo;
}
}
m = ((float)sum) / winarea;
s = sqrt ((((float)sum_sq) - ((float)(sum*sum))/winarea)/winarea);
if (s > max_s)
max_s = s;
map_m.fset(x_firstth, j, m);
map_s.fset(x_firstth, j, s);
mapm_rowdata[x_firstth] = m;
maps_rowdata[x_firstth] = s;
// Shift the window, add and remove new/old values to the histogram
for (int i=1 ; i <= im.cols-winx; i++)
@@ -86,8 +93,8 @@ float calcLocalStats (Mat &im, Mat &map_m, Mat &map_s, int winx, int winy)
s = sqrt ((((float)sum_sq) - ((float) (sum*sum))/winarea)/winarea);
if (s > max_s)
max_s = s;
map_m.fset(i+wxh, j, m);
map_s.fset(i+wxh, j, s);
mapm_rowdata[i+wxh] = m;
maps_rowdata[i+wxh] = s;
}
}
@@ -128,11 +135,15 @@ void NiblackSauvolaWolfJolion (Mat im, Mat output, NiblackVersion version,
for (int j = y_firstth ; j<=y_lastth; j++)
{
float* mapm_rowdata = map_m.ptr<float>(j);
float* maps_rowdata = map_s.ptr<float>(j);
float* thsurf_rowdata = thsurf.ptr<float>(j);
// NORMAL, NON-BORDER AREA IN THE MIDDLE OF THE WINDOW:
for (int i=0 ; i <= im.cols-winx; i++)
{
m = map_m.fget(i+wxh, j);
s = map_s.fget(i+wxh, j);
m = mapm_rowdata[i+wxh];
s = maps_rowdata[i+wxh];
// Calculate the threshold
switch (version)
@@ -154,25 +165,31 @@ void NiblackSauvolaWolfJolion (Mat im, Mat output, NiblackVersion version,
exit (1);
}
thsurf.fset(i+wxh,j,th);
thsurf_rowdata[i+wxh] = th;
if (i==0)
{
// LEFT BORDER
for (int i=0; i<=x_firstth; ++i)
thsurf.fset(i,j,th);
thsurf_rowdata[i] = th;
// LEFT-UPPER CORNER
if (j==y_firstth)
for (int u=0; u<y_firstth; ++u)
{
float* thsurf_subrowdata = thsurf.ptr<float>(u);
for (int i=0; i<=x_firstth; ++i)
thsurf.fset(i,u,th);
thsurf_subrowdata[i] = th;
}
// LEFT-LOWER CORNER
if (j==y_lastth)
for (int u=y_lastth+1; u<im.rows; ++u)
{
float* thsurf_subrowdata = thsurf.ptr<float>(u);
for (int i=0; i<=x_firstth; ++i)
thsurf.fset(i,u,th);
thsurf_subrowdata[i] = th;
}
}
// UPPER BORDER
@@ -188,31 +205,39 @@ void NiblackSauvolaWolfJolion (Mat im, Mat output, NiblackVersion version,
// RIGHT BORDER
for (int i=x_lastth; i<im.cols; ++i)
thsurf.fset(i,j,th);
thsurf_rowdata[i] = th;
// RIGHT-UPPER CORNER
if (j==y_firstth)
for (int u=0; u<y_firstth; ++u)
{
float* thsurf_subrowdata = thsurf.ptr<float>(u);
for (int i=x_lastth; i<im.cols; ++i)
thsurf.fset(i,u,th);
thsurf_subrowdata[i] = th;
}
// RIGHT-LOWER CORNER
if (j==y_lastth)
for (int u=y_lastth+1; u<im.rows; ++u)
{
float* thsurf_subrowdata = thsurf.ptr<float>(u);
for (int i=x_lastth; i<im.cols; ++i)
thsurf.fset(i,u,th);
thsurf_subrowdata[i] = th;
}
}
for (int y=0; y<im.rows; ++y)
{
uchar* outputdatarow = output.ptr<uchar>(y);
uchar* imdatarow = im.ptr<uchar>(y);
float* thsurfdatarow = thsurf.ptr<float>(y);
for (int x=0; x<im.cols; ++x)
{
if (im.uget(x,y) >= thsurf.fget(x,y))
{
output.uset(x,y,255);
}
if (imdatarow[x] >= thsurfdatarow[x])
outputdatarow[x]=255;
else
{
output.uset(x,y,0);
}
outputdatarow[x]=0;
}
}
}