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How to set scan frequency when save jpg using PROGRESSIVE mode

asked 2017-05-24 04:15:23 -0500

s_h1005 gravatar image

updated 2020-09-15 17:04:19 -0500

I saved jpg using PROGRESSIVE mode, this is my code:

Mat img = imread("input.jpg");
vector<int>compression_params;   
compression_params.push_back(IMWRITE_JPEG_PROGRESSIVE);
compression_params.push_back(1);
imwrite("out.jpg",img, compression_params);

Then I opened out.jpg by UltraEdit . I found that "FF DA" appeared 10 times , which meant that the scan time was 10 . How to change the scan time in OpenCV?

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answered 2017-05-24 04:39:49 -0500

berak gravatar image

unfortunately, this is currently not possible.

your compression_params flag just sets a boolean, and it calls jpeg_simple_progression

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Thank you very much.

s_h1005 gravatar images_h1005 ( 2017-05-25 01:09:26 -0500 )edit
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Asked: 2017-05-24 04:15:23 -0500

Seen: 320 times

Last updated: May 24 '17