Sharpen the image

C++
1

Hi guys,

I’m new to openCV. I have a picture that taken from long distance and I want to make it clear, so I use bilateralFilter and usm sharp to do operation, but the result is not ideal.
Thanks for help!

The code is like this:

src = imread( samples::findFile( filename ), IMREAD_COLOR );
//![bilateralfilter]
for ( int i = 1; i < 31; i = i + 2 )
        bilateralFilter ( src, dst, i, i*2, i/2 );

Mat blur_usm;
    //display_caption("gausss ");

    // usm sharp
    cv::GaussianBlur(src, blur_usm, Size(0, 0), 25);
    cv::addWeighted(src, 1.5, blur_usm, -0.5, 0, dst);
    imwrite("out.jpg", dst);

before:

70
701920×1080 71.9 KB

2

after:

out
out1920×1080 91.4 KB

3

the data just isn’t there. filters can’t bring it back.

4

USM often helps, at least visually…, but you need to tune the parameters for optimal results, considering image size and content

5

this is all useless . . . .

6

the original picture is 3MB, after upload, it become 91kb, so I think it should be enough