/*
* Description:
* Locates the characters of the license plate
* - Warp image (Rectify)
* - Segment characters
* - Remove blobs which are to small (Lines between characters)
* Input:
* //Original image
* RGB888Image plateImage
* //Segmented license plate
* Int32Image binaryPlateImage
* Output:
* //Image containing binary six characters
* ref Int32Image binaryCharacterImage
* Return:
* //Function executed successfully
* bool
*/
public static bool FindCharacters(RGB888Image plateImage, Int32Image binaryPlateImage, ref Int32Image binaryCharacterImage)
{
try
{
//Constants
const int c_height = 100;
const int c_width = 470;
const int c_remove_blobs_min = 1;
const int c_remove_blobs_max = 450;
XYCoord leftTop = new XYCoord();
XYCoord rightTop = new XYCoord();
XYCoord leftBottom = new XYCoord();
XYCoord rightBottom = new XYCoord();
//Find licenseplate
VisionLab.FindCornersRectangle(binaryPlateImage, Connected.EightConnected, 0.5, Orientation.Landscape, leftTop, rightTop, leftBottom, rightBottom);
if (!VisionLab.WarpCoordsValid(new Coord2D(leftTop), new Coord2D(rightTop), new Coord2D(leftBottom), new Coord2D(rightBottom)))
{
VisionLab.FindCornersRectangleSq(binaryPlateImage, Connected.EightConnected, leftTop, rightTop, leftBottom, rightBottom);
if (!VisionLab.WarpCoordsValid(new Coord2D(leftTop), new Coord2D(rightTop), new Coord2D(leftBottom), new Coord2D(rightBottom)))
{
return(false);
}
}
Int32Image plateImageGray = new Int32Image();
VisionLab.Convert(plateImage, plateImageGray);
//Rectify plate
VisionLab.Warp(plateImageGray, binaryCharacterImage, TransformDirection.ForwardT, new Coord2D(leftTop), new Coord2D(rightTop), new Coord2D(leftBottom), new Coord2D(rightBottom), c_height, c_width, 0);
plateImageGray.Dispose();
//*******************************//
//** Exercise: **//
//** adjust licenseplate **//
//** segmentation **//
//*******************************//
//Find dark text on bright licenseplate using ThresholdISOData
VisionLab.ThresholdIsoData(binaryCharacterImage, ObjectBrightness.DarkObject);
//Remove small blobs and noise
Int32Image binaryCharacterImageCopy = new Int32Image(binaryCharacterImage);
VisionLab.Opening(binaryCharacterImageCopy, binaryCharacterImage, new Mask_Int32(5, 1, 1));
//Remove blobs connected to the border
VisionLab.RemoveBorderBlobs(binaryCharacterImage, Connected.EightConnected, Border.AllBorders);
//Remove small blobs
VisionLab.RemoveBlobs(binaryCharacterImage, Connected.EightConnected, BlobAnalyse.BA_Area, c_remove_blobs_min, c_remove_blobs_max);
leftTop.Dispose();
rightTop.Dispose();
leftBottom.Dispose();
rightBottom.Dispose();
return(true);
}
catch (System.Exception ex)
{
throw new Exception("FindCharacters: " + ex.Message);
}
}
/* Description:
* Locates the characters of the license plate
* - Warp image (Rectify)
* - Segment characters
* - Remove blobs which are to small (Lines between characters)
* Input:
* //Original image
* RGB888Image plateImage
* //Segmented license plate
* Int16Image binaryPlateImage
* Output:
* //Image containing binary six characters
* ref Int16Image binaryCharacterImage
* Return:
* //Function executed successfully
* bool
*/
public static bool FindCharacters(RGB888Image plateImage, Int16Image binaryPlateImage, ref Int16Image binaryCharacterImage)
{
//Constants
const int c_height = 100;
const int c_width = 470;
const int c_remove_blobs_min = 0;
const int c_remove_blobs_max = 400;
XYCoord leftTop = new XYCoord();
XYCoord rightTop = new XYCoord();
XYCoord leftBottom = new XYCoord();
XYCoord rightBottom = new XYCoord();
// 2de set coordinaten:
// NIEUW
XYCoord leftTop2 = new XYCoord();
XYCoord rightTop2 = new XYCoord();
XYCoord leftBottom2 = new XYCoord();
XYCoord rightBottom2 = new XYCoord();
//Find licenseplate
Int32Image binaryPlateImage32 = new Int32Image();
VisionLab.Convert(binaryPlateImage, binaryPlateImage32);
VisionLab.FindCornersRectangle(
binaryPlateImage32,
Connected.EightConnected,
0.5,
Orientation.Landscape,
leftTop,
rightTop,
leftBottom,
rightBottom
);
// NIEUW
// Coordinaten bepalen voor deze functie
VisionLab.FindCornersRectangleSq(
binaryPlateImage32,
Connected.EightConnected,
leftTop2,
rightTop2,
leftBottom2,
rightBottom2
);
binaryPlateImage32.Dispose();
Int16Image plateImageGray = new Int16Image();
VisionLab.Convert(plateImage, plateImageGray);
binaryCharacterImage.Assign_Op(plateImageGray);
// Eerst de standaard wrap proberen
try
{
//Rectify plate
VisionLab.Warp(
plateImageGray,
binaryCharacterImage,
TransformDirection.ForwardT,
new Coord2D(leftTop),
new Coord2D(rightTop),
new Coord2D(leftBottom),
new Coord2D(rightBottom),
c_height,
c_width,
0
);
}
catch (Exception)
{
// NIEUW
// Als dat mislukt dan de andere gebruiken
try
{
VisionLab.Warp(plateImageGray,
binaryCharacterImage,
TransformDirection.ForwardT,
new Coord2D(leftTop2),
new Coord2D(rightTop2),
new Coord2D(leftBottom2),
new Coord2D(rightBottom2),
c_height,
c_width,
0
);
}
catch (Exception)
{
return(false);
}
}
plateImageGray.Dispose();
//*******************************//
//** Exercise: **//
//** adjust licenseplate **//
//** segmentation **//
//*******************************//
// NIEUW
Int16Image MaxMin = new Int16Image();
Int16Image MaxMin2 = new Int16Image();
// NIEUW
//2 x max rondje ding
//dan 2 x min rondje ding
//dan van elkaar aftrekken
//(zoeken op heldere object)
Mask_Int32 mask = new Mask_Int32(11, 11, 5, 5);
VisionLab.MaximumFilter(binaryCharacterImage, MaxMin, FixEdge.EdgeExtend, mask);
VisionLab.MaximumFilter(MaxMin, MaxMin2, FixEdge.EdgeExtend, mask);
VisionLab.MinimumFilter(MaxMin2, MaxMin, FixEdge.EdgeExtend, mask);
VisionLab.MinimumFilter(MaxMin, MaxMin2, FixEdge.EdgeExtend, mask);
// Maxmin2 holds the result now of the filter oparations
// Get the difference between both
VisionLab.Subtract(binaryCharacterImage, MaxMin2);
MaxMin2.Dispose();
MaxMin.Dispose();
//Find dark text on bright licenseplate using ThresholdISOData
VisionLab.ThresholdIsoData(binaryCharacterImage, ObjectBrightness.DarkObject);
Int16Image bin = new Int16Image();
// NIEUW
// Recreate images that are corralated / deformed
VisionLab.Opening(binaryCharacterImage, bin, new Mask_Int32(2, 2, 1));
// Convert to a 32 bit format
Int32Image binaryCharacterImage32 = new Int32Image();
// Int32Image binCharImg32 = new Int32Image();
VisionLab.Convert(bin, binaryCharacterImage32);
bin.Dispose();
// Remove blobs connected to the border
VisionLab.RemoveBorderBlobs(binaryCharacterImage32, Connected.EightConnected, Border.AllBorders);
// Remove small blobs
VisionLab.RemoveBlobs(binaryCharacterImage32, Connected.EightConnected, BlobAnalyse.BA_Area, c_remove_blobs_min, c_remove_blobs_max);
//Convert to a 16 bit format
VisionLab.Convert(binaryCharacterImage32, binaryCharacterImage);
binaryCharacterImage32.Dispose();
leftTop.Dispose();
rightTop.Dispose();
leftBottom.Dispose();
rightBottom.Dispose();
GC.Collect();
// NIEUW
// Check if 6 characters/blobs have been found and label image.
if (VisionLab.LabelBlobs(binaryCharacterImage, Connected.EightConnected) != 6)
{
return(false);
}
return(true);
}