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Asked: 2026-05-22T21:47:20+00:00

I have to implement a Harris detector and am not quite sure about the

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I have to implement a Harris detector and am not quite sure about the following detail regarding the Sobel filter to obtain the image derivative.
When applying the Sobel filter to a Grayscale image, I might get negative intensity values. Do I need to convert the Image back to a Matrix of only positive values before I calculate the Harris Matrix for each pixel or am I supposed to use the values as they are?

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  1. Editorial Team

    I don’t think you need to restrict it to only positive values.

    You can look at VLFeat‘s Harris corner detection implementation (Matlab/C source included). It’s in the toolbox directory: vl_harris.m

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