How to create a gray scale image where the intensty is based on the distance from a set of X and Y coordinates

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Hans Dohse 2014-11-21

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评论： Image Analyst 2014-11-21

I have an array of X and Y coordinates. I want to create an image where the pixel value is the distance (Sqrt( X**2 + Y**2 ) ) to the closest point in the array. I would like a bwdist( 'Euclidian' ) type function that can take in subpixel accuracy on the X and Y position.

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Mikhail 2014-11-21

"intensity is proportional to the distance to the closest point" - what does it mean? May be you want to create an image where intensity is proportional to the distance to a certain point (say, the origin of xy plane, center point of the image, etc). Explain your problem better.

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Image Analyst 2014-11-21

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Not sure why you don't think bwdist() can return fractional numbers. It's right there in the help as the very first example. It gives double results. Perhaps you need to cast your image to double first before calling it.

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Hans Dohse 2014-11-21

It does return fractional numbers but the input points have to be an on pixel in the input BW image. I am currently oversampling the BW image to get better input precision.

Image Analyst 2014-11-21

So use the oversampled image then. Why can't you do that?

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How to create a gray scale image where the intensty is based on the distance from a set of X and Y coordinates

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How to create a gray scale image where the intensty is based on the distance from a set of X and Y coordinates

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