Change the image background

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Qiang Cheng 2017-3-31

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https://ww2.mathworks.cn/matlabcentral/answers/332920-change-the-image-background

评论： Qiang Cheng 2017-4-3

Hi, I have some problem to my diesel spray and combustion image. I want to change the background of the image to black.because the quality of the image is bad, so I don't know how to mask the image. Thanks a lot.

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Image Analyst 2017-3-31

编辑：Image Analyst 2017-3-31

Please create an image that you'd want as the output. And what do you want to do assuming you can make it a black background? Measure area fraction or blob size distribution or something?

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Qiang Cheng 2017-4-3

Thank you very much for your reply. The output which i want have been marked as Yellow. Firstly, I think I have to find the boundary of the edge, and then cut the background.