How to crop image non rectangular region

I new comer in MATLAB, I want to crop this image of handwritten, so I can split each text line (red line boundaries). Can anyone help me how to crop using matlab.

回答(2 个)

https://www.mathworks.com/matlabcentral/answers/122906-how-can-i-determent-baseline-in-arabic-handwriting#answer_130116

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