Edge detection between position and neagtive

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Mohamed Jamal
Mohamed Jamal 2020-7-7
回答： Image Analyst 2020-7-7
Hi guys, Im trying to do in matlab edge detection that when I have a change value between 1 to -1 or between -1 to 1 (ranges is -1<data<1) ) so will detect this crosses/sections between moving from positive to negative or from negative to positive!
any help how can I do that edge detector in matlab? thanks alot

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回答（1 个）

Image Analyst
Image Analyst 2020-7-7
Is this what you're looking for:
% Create sample data in the range -1 to +1.
v = 2 * rand(1, 50) - 1
% Find out which ones of those are negative.
negativeIndexes = v < 0
% Find where it goes from above 0 to below 0
crossingIndexes = strfind(negativeIndexes, [0, 1])

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