CODEWITHSUNDEEP
opencv
Bill Williamson
Bill Williamson

Reputation: 73

OpenCV filtering part of an image

I'm using the C++ openCV api, and I would like to selectively blur only certain pixels in an image. What is the best way to do this? I was attempting to do it via submatrices, but haven't been able to get it to work.

//5 is the 'radius' i'm blurring (~1/2 kernel width)
cv::Rect srcRect;
srcRect.x = x - 5;
srcRect.y = y - 5;
srcRect.width = 2*5 + 1;
srcRect.height = 2*5 + 1;

cv::Rect dstRect;
dstRect.x = x;
dstRect.y = y;
dstRect.width = 1;
dstRect.height = 1;

cv::Mat src = srcImage(srcRect);
cv::Mat dst = dstImage(dstRect);

cv::blur(src, dst, cv::Size(5,5));

With the above code, nothing changes.

When i set both of the rectangles to srcRect, the sub images are blurred, but the entire dst is blurred then, instead of just the single pixel.

Any ideas?

Upvotes: 1

Views: 3822

Answers (2)

shimul shakhawat
shimul shakhawat

Reputation: 1

The input is the original image and blur is the clone image of input

int x1=1,y1=1,x2=200,y2=200;

Rect region(x1, y1, x2, y2);

GaussianBlur(input(region), blur(region), Size(5, 5), x,0);

Upvotes: 0

Sam
Sam

Reputation: 20056

src and dst must be the same size. In your example, dst is a subregion of exactly one pixel.

Your code is correct, besides the way you build rectangles.

Rect srcDstRect(7, 7, 100, 100);
cv::Mat src = srcImage(srcDstRect);
cv::Mat dst = dstImage(srcDstRect);

cv::blur(src, dst, cv::Size(5,5));

Upvotes: 3

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