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# Optimising Canny Edge Detector for Android

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## Canny Edge Detector in C

Tag : cpp , By : Franky
Date : March 29 2020, 07:55 AM
like below fixes the issue I am looking for a bit of clarification on how the algorithms implemented in Canny edge detection - Wikipedia entry - work. It seems pretty straightforward to perform noise reduction using a 2D Gaussian filter, but I have heard that using two 1D filters - how is this accomplished? It's also simple to calculate the gradient and edge direction. However, when performing non-maximum suppression is there a neat trick to getting the rounded angle? What I'm currently doing is dividing the edge direction (theta) value by pi/4, casting it to an integer and using a switch statement. But, how does one handle the negative theta values - ie should -pi/4 be handled the same way as 3*pi/4 or the same as pi/4? , Gauss distribution:
[constants are omitted for simplicity]

## Canny edge detector for Android -- StackOverflow on recursive function

Tag : java , By : Mario Tristan
Date : March 29 2020, 07:55 AM
With these it helps Android's default thread stack is much smaller than what you get on a desktop. In current Android builds (2.3), the stack size is set to 12kB I believe. Your recursion is simply too deep.

## Fast Adaptive Threshold for Canny Edge Detector in Android

Tag : java , By : lili
Date : March 29 2020, 07:55 AM

## Canny edge detector for Android

Tag : android , By : TomL
Date : March 29 2020, 07:55 AM

## How to make a canny edge detector in Python like edge() Matlab function

Tag : python , By : Ike
Date : March 29 2020, 07:55 AM