/* Description:
Find the largest license plate in the image
- Segment using ThresholdHSVchannels
- Remove blobs which are not license plates
Input:
//Original image
RGB888Image plateImage
Output:
//Segmented license plate
ref Int16Image binaryPlateImage
Return:
//License plate found?
bool
*/
public static bool FindPlate(RGB888Image plateImage, ref Int16Image binaryPlateImage, TresholdConditions state)
{
//Constants
int c_threshold_h_min = 0;
int c_threshold_h_max = 0;
int c_threshold_s_min = 0;
int c_threshold_s_max = 0;
int c_threshold_v_min = 0;
int c_threshold_v_max = 0;
int c_remove_blobs_min = 0;
int c_remove_blobs_max = 500;
switch(state)
{
case(TresholdConditions.NORMAAL):
c_threshold_h_min = 21;
c_threshold_h_max = 50;
c_threshold_s_min = 100;
c_threshold_s_max = 255;
c_threshold_v_min = 100;
c_threshold_v_max = 255;
break;
case(TresholdConditions.ONDERBELICHT):
c_threshold_h_min = 11;
c_threshold_h_max = 119;
c_threshold_s_min = 23;
c_threshold_s_max = 255;
c_threshold_v_min = 56;
c_threshold_v_max = 176;
break;
case(TresholdConditions.OVERBELICHT):
c_threshold_h_min = 0;
c_threshold_h_max = 241;
c_threshold_s_min = 29;
c_threshold_s_max = 241;
c_threshold_v_min = 249;
c_threshold_v_max = 255;
break;
}
//*******************************//
//** Exercise: **//
//** adjust licenseplate **//
//** segmentation **//
//*******************************//
//Find licenseplate
HSV888Image plateImageHSV = new HSV888Image();
//Convert to RGB to HSV
VisionLab.FastRGBToHSV(plateImage, plateImageHSV);
//Threshold HSV image
VisionLab.Threshold3Channels(plateImageHSV, binaryPlateImage, c_threshold_h_min, c_threshold_h_max, c_threshold_s_min, c_threshold_s_max, c_threshold_v_min, c_threshold_v_max);
//Convert to a 32 bit format
Int32Image binaryPlateImage32 = new Int32Image();
VisionLab.Convert(binaryPlateImage, binaryPlateImage32);
//Remove blobs with small areas
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_Area, c_remove_blobs_min, c_remove_blobs_max);
//Remove border blobs
VisionLab.RemoveBorderBlobs(binaryPlateImage32, Connected.EightConnected, Border.AllBorders);
//Length Breath Ratio
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_LengthBreadthRatio, 0, 2.5);
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_LengthBreadthRatio, 6.7, 10);
// Remove blobs that have to less holes
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_NrOfHoles, 0, 5);
// And remove blobs that have a to small area for the holes
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_AreaHoles, 0, 200);
//Convert back to a 16 bit format
VisionLab.Convert(binaryPlateImage32, binaryPlateImage);
//binPlateImage32.Dispose();
binaryPlateImage32.Dispose();
plateImageHSV.Dispose();
GC.Collect();
//Return true, if pixels found
return (VisionLab.SumIntPixels(binaryPlateImage) > 0);
//return VisionLab.LabelBlobs(binaryPlateImage, Connected.EightConnected) == 1;
}
/* Description:
* Find the largest license plate in the image
* - Segment using ThresholdHSVchannels
* - Remove blobs which are not license plates
* Input:
* //Original image
* RGB888Image plateImage
* Output:
* //Segmented license plate
* ref Int16Image binaryPlateImage
* Return:
* //License plate found?
* bool
*/
public static bool FindPlate(RGB888Image plateImage, ref Int16Image binaryPlateImage, TresholdConditions state)
{
//Constants
int c_threshold_h_min = 0;
int c_threshold_h_max = 0;
int c_threshold_s_min = 0;
int c_threshold_s_max = 0;
int c_threshold_v_min = 0;
int c_threshold_v_max = 0;
int c_remove_blobs_min = 0;
int c_remove_blobs_max = 500;
switch (state)
{
case (TresholdConditions.NORMAAL):
c_threshold_h_min = 21;
c_threshold_h_max = 50;
c_threshold_s_min = 100;
c_threshold_s_max = 255;
c_threshold_v_min = 100;
c_threshold_v_max = 255;
break;
case (TresholdConditions.ONDERBELICHT):
c_threshold_h_min = 11;
c_threshold_h_max = 119;
c_threshold_s_min = 23;
c_threshold_s_max = 255;
c_threshold_v_min = 56;
c_threshold_v_max = 176;
break;
case (TresholdConditions.OVERBELICHT):
c_threshold_h_min = 0;
c_threshold_h_max = 241;
c_threshold_s_min = 29;
c_threshold_s_max = 241;
c_threshold_v_min = 249;
c_threshold_v_max = 255;
break;
}
//*******************************//
//** Exercise: **//
//** adjust licenseplate **//
//** segmentation **//
//*******************************//
//Find licenseplate
HSV888Image plateImageHSV = new HSV888Image();
//Convert to RGB to HSV
VisionLab.FastRGBToHSV(plateImage, plateImageHSV);
//Threshold HSV image
VisionLab.Threshold3Channels(plateImageHSV, binaryPlateImage, c_threshold_h_min, c_threshold_h_max, c_threshold_s_min, c_threshold_s_max, c_threshold_v_min, c_threshold_v_max);
//Convert to a 32 bit format
Int32Image binaryPlateImage32 = new Int32Image();
VisionLab.Convert(binaryPlateImage, binaryPlateImage32);
//Remove blobs with small areas
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_Area, c_remove_blobs_min, c_remove_blobs_max);
//Remove border blobs
VisionLab.RemoveBorderBlobs(binaryPlateImage32, Connected.EightConnected, Border.AllBorders);
//Length Breath Ratio
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_LengthBreadthRatio, 0, 2.5);
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_LengthBreadthRatio, 6.7, 10);
// Remove blobs that have to less holes
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_NrOfHoles, 0, 5);
// And remove blobs that have a to small area for the holes
VisionLab.RemoveBlobs(binaryPlateImage32, Connected.EightConnected, BlobAnalyse.BA_AreaHoles, 0, 200);
//Convert back to a 16 bit format
VisionLab.Convert(binaryPlateImage32, binaryPlateImage);
//binPlateImage32.Dispose();
binaryPlateImage32.Dispose();
plateImageHSV.Dispose();
GC.Collect();
//Return true, if pixels found
return(VisionLab.SumIntPixels(binaryPlateImage) > 0);
//return VisionLab.LabelBlobs(binaryPlateImage, Connected.EightConnected) == 1;
}