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

Question

Hans Dohse 2014-11-21

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163654-how-to-create-a-gray-scale-image-where-the-intensty-is-based-on-the-distance-from-a-set-of-x-and-y-c

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.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

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.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2014-11-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/163654-how-to-create-a-gray-scale-image-where-the-intensty-is-based-on-the-distance-from-a-set-of-x-and-y-c#answer_159790

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.

2 个评论
显示无隐藏无

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.