How to extract non linear picture from JPG file

Question

Ibrahim Thorig 2013-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/107225-how-to-extract-non-linear-picture-from-jpg-file

编辑： Image Analyst 2013-11-22

I'm new to matlab, anyone guide me to extract the nonlinear picture from a JPG file. I have a JPG file, which has 3 nonlinear picture, I want to extract these three piece of nonlinear picture in my JPG file.

thank you in advance waiting for response.

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Ibrahim Thorig 2013-11-22

Non linear means, i have a scan image which has torn picture piece. for example:

ls find the attached

Image Analyst 2013-11-22

编辑：Image Analyst 2013-11-22

Is there a real world need for you to do this, or is it just a homework exercise? How did you ever come to have pictures of some torn up photograph at oddball angles? If you work in forensics and need to reconstruct a photo that the suspect tore up, this can be done very easily with Photoshop and manual interaction. There is no need to write some complicated program when you don't have to.

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Answer 1

Walter Roberson 2013-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/107225-how-to-extract-non-linear-picture-from-jpg-file#answer_116072

The JPEG image format cannot store non-rectangular images. MATLAB cannot store non-rectangular arrays.

What you can do in some cases is to read in rectangular images, and found the visual boundary of them, and construct a "mask" to select only the visual object. See for example http://www.mathworks.com/matlabcentral/answers/76961