choose a threshold for segmentation

how to choose a threshold to segment object we need from saliency map....

i was trying the code in the link

http://www.mathworks.in/matlabcentral/answers/125398-segment-object-from-saliency-map

for other images.... but it is not working for the images i gave.... i tried adjusting the threshold value... but not getting correctly.... i tried using greythresh to find the threshold but still not getting...

please can someone help me how to choose a threshold for the following images...

The Christ from the images in link...

http://oi60.tinypic.com/2ur5ly9.jpg

http://oi62.tinypic.com/2f06sjn.jpg

The football players...

http://oi58.tinypic.com/23rlkww.jpg

http://oi60.tinypic.com/1zf258m.jpg

original images of football players, they are in 2 colors thats why the saliency map has 2 shades... so when segmenting only one person is segmenting, how to segment both of them....

http://oi57.tinypic.com/15hbhxl.jpg

http://oi58.tinypic.com/2pzky34.jpg

The leaf from the images in the link...

http://oi58.tinypic.com/8xqahf.jpg

Please do help me how to choose a threshold for the above images....

Answer 1

[Image Analyst]

If some part of the uniform is "uniform" (not salient) then you might have to combine it with color segmentation.

[Elysi Cochin]

sir with any of the above images can you show one example of color segmentation....

[Image Analyst]

I don't have time for that, at least not until the weekend at the earliest, if even then. Please apply the color segmentation methods in my File Exchange to your images: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

[Elysi Cochin]

thank u sir...