Opecv Getting transparent image outlines

Get profile

#import <opencv2/opencv.hpp> #import <opencv2/imgcodecs/ios.h> #import <opencv2/imgproc/types_c.h > @implementation opencvhelper+ (UIImage *) Getimageoutline: (UIImage *) iputimg{    cv::mat cvimage;    Uiimagetomat (iputimg, cvimage);    Cv::mat Gray;    Convert the image to grayscale;    Cv::cvtcolor (Cvimage, Gray, Cv_rgba2gray);    Apply Gaussian Filter to remove small edges    cv::gaussianblur (gray, Gray, Cv::size (5,5), 1.2,1.2);    Calculate edges with Canny    cv::mat edges;    Cv::canny (gray, edges, 0,);    Fill image with white color    //cvimage.setto (cv::scalar (255,255,255,1));    Change color on edges    //Cvimage.setto (Cv::scalar (0,128,255,255), edges);        Cv::mat cvoutimage= Cv::mat::zeros (Cvimage.size (), Cvimage.type ());    Cvoutimage.setto (Cv::scalar (255,255,255,0));    Cvoutimage.setto (Cv::scalar (0,139,139,1), edges);    Return Mattouiimage (cvoutimage);} @end

Convert to Transparent

-(UIImage *) Transparentimage: (UIImage *) image{//Create a pixel buffer in an easy to use format Cgimageref imag    Eref = [Image cgimage];    Nsuinteger width = cgimagegetwidth (imageref);    Nsuinteger height = cgimagegetheight (imageref);        Cgcolorspaceref colorspace = Cgcolorspacecreatedevicergb ();        UInt8 * m_pixelbuf = malloc (sizeof (UInt8) * Height * width * 4);    Nsuinteger bytesperpixel = 4;    Nsuinteger Bytesperrow = bytesperpixel * width;    Nsuinteger bitspercomponent = 8; Cgcontextref context = Cgbitmapcontextcreate (m_pixelbuf, width, height, bi Tspercomponent, Bytesperrow, ColorSpace, Kcgimagealphapremultipliedlast |        KCGBITMAPBYTEORDER32BIG);    Cgcontextdrawimage (context, CGRectMake (0, 0, width, height), imageref);        Cgcontextrelease (context);    alter the alpha int length = height * Width * 4; for (int i=0; i<length; i+=4) {if (M_pixelbuf[i+0] ==255) {m_pixelbuf[i+0] = 0;            M_pixelbuf[i+1] = 0;            M_PIXELBUF[I+2] = 0;        M_PIXELBUF[I+3] = 0;                                             }}//create a new image cgcontextref CTX = Cgbitmapcontextcreate (m_pixelbuf, width, height, Bitspercomponent, Bytesperrow, ColorSpace, KC Gimagealphapremultipliedlast |        KCGBITMAPBYTEORDER32BIG);    Cgimageref newimgref = Cgbitmapcontextcreateimage (CTX);    Cgcolorspacerelease (ColorSpace);     Cgcontextrelease (CTX);        Free (M_PIXELBUF);    UIImage *finalimage = [UIImage imagewithcgimage:newimgref];         Cgimagerelease (NEWIMGREF); return finalimage;}

　　

Opecv Getting transparent image outlines