[英]OpenCV with Laplacian formula to detect image is blur or not in iOS
提前感謝您的幫助。
我有很多研發和搜索,但我找不到任何檢測模糊圖像的解決方案。
我使用過這個https://github.com/BloodAxe/OpenCV-Tutorial並使用拉普拉斯公式進行模糊檢測,但無法在圖像中獲得模糊檢測
- (void)checkForBurryImage:(UIImage *)image {
cv::Mat matImage = [image toMat]; cv::Mat matImageGrey; cv::cvtColor(matImage, matImageGrey, CV_BGRA2GRAY); cv::Mat dst2 =[image toMat]; cv::Mat laplacianImage; dst2.convertTo(laplacianImage, CV_8UC1); cv::Laplacian(matImageGrey, laplacianImage, CV_8U); cv::Mat laplacianImage8bit; laplacianImage.convertTo(laplacianImage8bit, CV_8UC1); //------------------------------------------------------------- //------------------------------------------------------------- unsigned char *pixels = laplacianImage8bit.data; //------------------------------------------------------------- //------------------------------------------------------------- // unsigned char *pixels = laplacianImage8bit.data; int maxLap = -16777216; for (int i = 0; i < ( laplacianImage8bit.elemSize()*laplacianImage8bit.total()); i++) { if (pixels[i] > maxLap) maxLap = pixels[i]; } int soglia = -6118750; printf("\\n maxLap : %i",maxLap); if (maxLap < soglia || maxLap == soglia) { printf("\\n\\n***** blur image *****"); }else printf("\\nNOT a blur image"); }
我使用相同的代碼作為Android和它的工作正常,但在iOS,它給我總是積極的價值所以我認為它不起作用,
所以請給我想法或鏈接或任何建議。
用這個 :
Laplacian(gray, laplacianImage, CV_64F);
Scalar mean, stddev; // 0:1st channel, 1:2nd channel and 2:3rd channel
meanStdDev(laplacianImage, mean, stddev, Mat());
double variance = stddev.val[0] * stddev.val[0];
double threshold = 2900;
if (variance <= threshold) {
// Blurry
} else {
// Not blurry
}
用這個
-(BOOL) checkForBurryImage:(cv::Mat) matImage {// Output:(cv::Mat &) outputFrame {
cv::Mat finalImage;
cv::Mat matImageGrey;
cv::cvtColor(matImage, matImageGrey, CV_BGRA2GRAY);
matImage.release();
cv::Mat newEX;
const int MEDIAN_BLUR_FILTER_SIZE = 15; // odd number
cv::medianBlur(matImageGrey, newEX, MEDIAN_BLUR_FILTER_SIZE);
matImageGrey.release();
cv::Mat laplacianImage;
cv::Laplacian(newEX, laplacianImage, CV_8U); // CV_8U
newEX.release();
cv::Mat laplacianImage8bit;
laplacianImage.convertTo(laplacianImage8bit, CV_8UC1);
laplacianImage.release();
cv::cvtColor(laplacianImage8bit,finalImage,CV_GRAY2BGRA);
laplacianImage8bit.release();
int rows = finalImage.rows;
int cols= finalImage.cols;
char *pixels = reinterpret_cast<char *>( finalImage.data);
int maxLap = -16777216;
for (int i = 0; i < (rows*cols); i++) {
if (pixels[i] > maxLap)
maxLap = pixels[i];
}
int soglia = -6118750;
pixels=NULL;
finalImage.release();
BOOL isBlur = (maxLap < kBlurThreshhold)? YES : NO;
return isBlur;
}
以下方法使用OpenCV :
- (BOOL) isImageBlurry:(UIImage *) image {
// converting UIImage to OpenCV format - Mat
cv::Mat matImage = [self convertUIImageToCVMat:image];
cv::Mat matImageGrey;
// converting image's color space (RGB) to grayscale
cv::cvtColor(matImage, matImageGrey, CV_BGR2GRAY);
cv::Mat dst2 = [self convertUIImageToCVMat:image];
cv::Mat laplacianImage;
dst2.convertTo(laplacianImage, CV_8UC1);
// applying Laplacian operator to the image
cv::Laplacian(matImageGrey, laplacianImage, CV_8U);
cv::Mat laplacianImage8bit;
laplacianImage.convertTo(laplacianImage8bit, CV_8UC1);
unsigned char *pixels = laplacianImage8bit.data;
// 16777216 = 256*256*256
int maxLap = -16777216;
for (int i = 0; i < ( laplacianImage8bit.elemSize()*laplacianImage8bit.total()); i++) {
if (pixels[i] > maxLap) {
maxLap = pixels[i];
}
}
// one of the main parameters here: threshold sets the sensitivity for the blur check
// smaller number = less sensitive; default = 180
int threshold = 100;
return (maxLap <= threshold);
}
將 UIImage
轉換 為 OpenCV::Mat
- (cv::Mat)convertUIImageToCVMat:(UIImage *)image {
CGColorSpaceRef colorSpace = CGImageGetColorSpace(image.CGImage);
CGFloat cols = image.size.width;
CGFloat rows = image.size.height;
cv::Mat cvMat(rows, cols, CV_8UC4); // 8 bits per component, 4 channels (color channels + alpha)
CGContextRef contextRef = CGBitmapContextCreate(cvMat.data, // Pointer to data
cols, // Width of bitmap
rows, // Height of bitmap
8, // Bits per component
cvMat.step[0], // Bytes per row
colorSpace, // Colorspace
kCGImageAlphaNoneSkipLast |
kCGBitmapByteOrderDefault); // Bitmap info flags
CGContextDrawImage(contextRef, CGRectMake(0, 0, cols, rows), image.CGImage);
CGContextRelease(contextRef);
return cvMat;
}
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