python - Detecting & highlighting macroblocks in an image with compression artifacts -

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part of large image macroblocks

hello, have image portion of has macro-blocking effect. in attachment below, have taken region of macroblock using scikit & numpy arrays. curious know if there way identify such regions in image , highlight / quantify them i.e identify horizontal & veritical lines/blocks / bounday & highlight them , discard curvature (angular) edges may part of larger image.

i have tried using hough line transform, , see colored lines in other angles along horizontal & veritical lines. want supress other angles not 0/90 deg. possible scikit-image apis?

thanks in advance.


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