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11 // For Open Source Computer Vision Library
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43 #import "opencv2/highgui/cap_ios.h"
44 #include "precomp.hpp"
46 UIImage* MatToUIImage(const cv::Mat& image) {
48 NSData *data = [NSData dataWithBytes:image.data
49 length:image.elemSize()*image.total()];
51 CGColorSpaceRef colorSpace;
53 if (image.elemSize() == 1) {
54 colorSpace = CGColorSpaceCreateDeviceGray();
56 colorSpace = CGColorSpaceCreateDeviceRGB();
59 CGDataProviderRef provider =
60 CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
62 // Creating CGImage from cv::Mat
63 CGImageRef imageRef = CGImageCreate(image.cols,
70 kCGBitmapByteOrderDefault,
74 kCGRenderingIntentDefault
78 // Getting UIImage from CGImage
79 UIImage *finalImage = [UIImage imageWithCGImage:imageRef];
80 CGImageRelease(imageRef);
81 CGDataProviderRelease(provider);
82 CGColorSpaceRelease(colorSpace);
87 void UIImageToMat(const UIImage* image,
88 cv::Mat& m, bool alphaExist) {
89 CGColorSpaceRef colorSpace = CGImageGetColorSpace(image.CGImage);
90 CGFloat cols = image.size.width, rows = image.size.height;
91 CGContextRef contextRef;
92 CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast;
93 if (CGColorSpaceGetModel(colorSpace) == 0)
95 m.create(rows, cols, CV_8UC1); // 8 bits per component, 1 channel
96 bitmapInfo = kCGImageAlphaNone;
98 bitmapInfo = kCGImageAlphaNone;
99 contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8,
100 m.step[0], colorSpace,
105 m.create(rows, cols, CV_8UC4); // 8 bits per component, 4 channels
107 bitmapInfo = kCGImageAlphaNoneSkipLast |
108 kCGBitmapByteOrderDefault;
109 contextRef = CGBitmapContextCreate(m.data, m.cols, m.rows, 8,
110 m.step[0], colorSpace,
113 CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows),
115 CGContextRelease(contextRef);
116 CGColorSpaceRelease(colorSpace);