How to get which "label" corresponds to which "seed" in the Distance Transform.

[rsapaico]

Hello, I hope you can help me with the following:

I am using the Distance Transform function (ippiDistanceTransform_3x3_8u32f_C1R). My input image has the "seeds" as zeroes, and I am obtaining an output image containing the distance to those seeds.

However, I need also to know, for a given pixel (x,y) whose distance size is "d", which "seed" this distance is relative to. In other words, for each "non-feature" pixel I would like to obtain not only "distances" but also "associations" to a seed pixel.
I have searched the IPP Documentation and I could not find anything about that.

EDIT: I think what I am asking is the same as obtaining the "Voronoi Diagram" for the image, so any hints on this are also appreciated.

I hope I could made myself clear. Any hint will be highly appreciated.

Regards,
Ricardo

[Chao_Y_Intel]

Hi Ricardo,

ippiDistanceTransform is optimized functions for OpenCV function, cvDistTransform(..). It is true that these function do not record the associated seed pixel. Possibly you can modify the cvDistTransform() function ( in OpenCV cvdistransform.cpp file) and recorded the seed pixel according to the requirement in your application.

Thanks,
Chao

[rsapaico]

Hi Chao,

Thank you very much for your response.
I will see what I can do using your suggestion. If I get any good results, I will post back.

Regards,
Ricardo

[lilin_f_]

Hi,

see cv::DistanceTransformLabelTypes, just a hint.