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How to find the length of segments of a matrix that meet certain condition?

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Terek Li 2017-11-11

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回答： Image Analyst 2017-11-11

采纳的回答： Image Analyst

Hi guys, I am trying hard to think of an algorithm for this, but no luck.

If I have a matrix a = [77 77 77 79 79 79 77 77 77 77];

And I want to find the length of segments that are equal to 77 (3 and 4).

What is the most efficient way to do this?

thank you very much for your help!

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per isakson 2017-11-11

See % RUNLENGTH_M - RLE coding as M-function for education

You find RUNLENGTH_M under the Functions tab.

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Image Analyst 2017-11-11

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Simply use the function meant for that. If you have the Image Processing Toolbox, use regionprops:

a = [77 77 77 79 79 79 77 77 77 77];
props = regionprops(a == 77, 'Area');
allLengths = [props.Area]

You'll get:

allLengths =
   3     4

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