how to detect more lines using hough function

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Jack 2011-3-23

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https://ww2.mathworks.cn/matlabcentral/answers/3864-how-to-detect-more-lines-using-hough-function

i need help

i have an image which i want to detect lines from it i do houg, than hough lines than hough peaks. i impose it on the image but only a few of the lines are detected i tried setting the number of peaks to 10, 100 , 500 1000 it didn't help much.

what do i have to do to make it detect all the lines

Thanks

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Answer 1

David Young 2011-3-24

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Try reducing the threshold parameter in HOUGHPEAKS. The default is half the maximum value in the array.

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Answer 2

Jack 2011-3-24

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Thanks for the quick reply. i will try and experiment with the thresh values and report back my results.

Thanks

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Answer 3

Jack 2011-3-26

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https://ww2.mathworks.cn/matlabcentral/answers/3864-how-to-detect-more-lines-using-hough-function#answer_5736

i tried it using the circuit example the problem was keeping the threshold value to default ceil(0.3*max(H(:))) but when i change it to 1 then change the peak values than it works but when i keep peak at 100 and change threshold to 1 says 154 lines, threshold to 10, 0.1 154 lines. so choosing threshol value is not easy as random value .

Thanks for the help