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so I want to change an image from lets say width=500 to width=100, using linear interpolation. How can I do that?

Andrei Clotan
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  • Your question needs improvments: more infomation about the problem, what you tried in order to solve it etc. See here: https://stackoverflow.com/help/how-to-ask. – wohlstad May 09 '22 at 03:43

1 Answers1

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I'll try to help even though the question requires improvements:

You can use cv::resize to resize the image. The interpolation parameter can be set to cv::INTER_LINEAR for linear interpolation.

Code example:

cv::Mat bigImg(cv::Size(500, 500), CV_8UC1);
// Initialize bigImg in some way ...
cv::Mat smallImg;
cv::resize(bigImg, smallImg, cv::Size(100, 100), 0, 0, cv::INTER_LINEAR);

See the documentation for cv::resize, and interpolation options.

You can also see recommended interpolation method for various cases here: Which kind of interpolation best for resizing image?.

wohlstad
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