How to save bounded rectangle boxes as a separate image/entity in MATLAB?

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I am trying to identify playing cards in a poker game. I have identified the regions that contain the playing cards and have surrounded them with bounding boxes. Now what i want to do is to save those regions as separate images/entities so that i can use SIFT/Template matching on them to identify the cards. Can anyone help me with this?

Answer 1

[Walter Roberson]

https://www.mathworks.com/help/images/ref/regionprops.html

'SubarrayIdx' Returns a cell array that contains indices such that L(idx{:}) extracts the elements of L inside the object bounding box.

You can use then idx{:} to index your original image to extract the relevant portions.

Answer 2

[Image Analyst]

Try using indexing or imcrop() to extract the bounding boxes. then use imwrite() or save() to save them to disk.