detecting object in Homogeneous Intensity image.

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Suvidha
Suvidha 2013-2-18
I have image of Tiger's Pugmark (footprint impression) on mud. I want to detect the boundary of the pugmark but the image is uniform in intensity that is foreground and background cannot be distinguished based on intensity variations. What can i do to distinguish between the pugmark and the background.

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Image Analyst
Image Analyst 2013-2-18
Try thresholding and texture filters, like entropyfilt() and stdfilt(). It will be tough, particularly where the pawprint is not very well outlined. I can imagine you could have some parts that don't have a clear and distinct outline - it just kind fades away.
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Suvidha
Suvidha 2013-2-19
编辑：Suvidha 2013-2-19
Thank you . I am going to try it on the imaage. I also tried the 'neon' effect in picasa on this image and it outlined the pugmark impression. But i could not find algorithm for neon filtering. if you know anything about it please share it here. Here's what it looks like after neon effect
Image Analyst
Image Analyst 2013-2-19
编辑：Image Analyst 2013-3-4
Looks like a Sobel filter to me. You can do that with conv2() or imgradient().

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