C # open CV EMGU CV positioning license plate IDEA and code

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Nothing recently, the company leaders want us to understand the image processing, so learning the following! Because I am not very good at C + +, I can only try to write code in C #! However, there is little information about EMGU CV on the Internet, and many of them are in English, and they are not detailed. So slowly pondering. Wrote a C # positioning license plate code, but the effect is not very ideal. Reference the Code of C + + master!

The idea is 1. Grayscale, Vertical edge detection

2. Adaptive binary Processing

3. Morphology treatment (swelling and corrosion)

4. Contour Search and filtering

The code is as follows:

IMAGE&LT;BGR, byte> simage = img;//New IMAGE<BGR, byte> ("license-plate.jpg"); //image<bgr, byte> simage = Sizeimage. Resize (n., Emgu.CV.CvEnum.INTER.CV_INTER_NN);Image<gray, byte> grayimg =NewImage<gray, byte>(simage. Width, Simage.            Height); INTPTR GRAYIMG1= Cvinvoke.cvcreateimage (simage. Size, Emgu.CV.CvEnum.IPL_DEPTH. IPL_DEPTH_8U,1); //GrayscaleCvinvoke.cvcvtcolor (simage. PTR, GRAYIMG1, Emgu.CV.CvEnum.COLOR_CONVERSION.            Bgr2gray); //first create a 16-depth signed image areaIntPtr Sobel = Cvinvoke.cvcreateimage (simage. Size, Emgu.CV.CvEnum.IPL_DEPTH. Ipl_depth_16s,1); //Sobel operator detection in X-directionCvinvoke.cvsobel (GRAYIMG1, Sobel,2,0,3); INTPTR Temp= Cvinvoke.cvcreateimage (simage. Size, Emgu.CV.CvEnum.IPL_DEPTH. IPL_DEPTH_8U,1); Cvinvoke.cvconvertscale (Sobel, temp,0.00390625,0); ////int it = Computethresholdvalue (Grayimg.tobitmap ()); ////Two value processing////image<gray, byte>dest = Grayimg.thresholdbinary (new Gray (it), new Gray (255));Image<gray, byte> dest =NewImage<gray, byte>(simage. Width, Simage.            Height); //two value processingCvinvoke.cvthreshold (temp, dest,0,255, Emgu.CV.CvEnum.THRESH.CV_THRESH_OTSU); INTPTR Temp1= Cvinvoke.cvcreateimage (simage. Size, Emgu.CV.CvEnum.IPL_DEPTH. IPL_DEPTH_8U,1); Image<gray, byte> dest1 =NewImage<gray, byte>(simage. Width, Simage.            Height); Cvinvoke.cvcreatestructuringelementex (3,1,1,0, Emgu.CV.CvEnum.CV_ELEMENT_SHAPE.            Cv_shape_rect, TEMP1); Cvinvoke.cvdilate (dest, Dest1, Temp1,6); Cvinvoke.cverode (Dest1, Dest1, Temp1,7); Cvinvoke.cvdilate (Dest1, Dest1, Temp1,1); Cvinvoke.cvcreatestructuringelementex (1,3,0,1, Emgu.CV.CvEnum.CV_ELEMENT_SHAPE.            Cv_shape_rect, TEMP1); Cvinvoke.cverode (Dest1, Dest1, Temp1,2); Cvinvoke.cvdilate (Dest1, Dest1, Temp1,2); INTPTR DST= Cvinvoke.cvcreateimage (simage. Size, Emgu.CV.CvEnum.IPL_DEPTH. IPL_DEPTH_8U,3);            Cvinvoke.cvzero (DST); //Dest.            Dilate (10); //Dest. Erode (5);            using(Memstorage Stor =NewMemstorage ()) {Contour<Point> contours =Dest1. Findcontours (Emgu.CV.CvEnum.CHAIN_APPROX_METHOD. Cv_chain_approx_simple, Emgu.CV.CvEnum.RETR_TYPE.                Cv_retr_ccomp, Stor);  for(; Contours! =NULL; contours =contours. Hnext) {Rectangle box=contours.                    Boundingrectangle; Image&LT;BGR, byte> test =Simage.                    Copyblank (); Test. SetValue (255.0); DoubleWhratio = (Double) box. Width/box.                    Height; intArea = (int) box. Width *box.                    Height; if(Area > +&& area<10000)                    {                        if((3.0< Whratio && Whratio <6.0) ) {test. Draw (Box,NewBGR (color.red),2); Simage. Draw (Box,NewBGR (color.red),2); Cvinvoke.cvrectangle (Simage,NewPoint (box. X, Box. Y),NewPoint (box. X + box. Width, Box. Y + box. Height),NewMcvscalar (255,0,0),1, Emgu.CV.CvEnum.LINE_TYPE. eight_connected,0); //Cvinvoke.cvnamedwindow ("DST"); //cvinvoke.cvshowimage ("DST", DST);Imagebox1.image =Simage; }                    }                }            }

There's still some details that haven't been dealt with.

C # open CV EMGU CV positioning license plate IDEA and code