how i measure a threshold value to use it in a wavelet_based image segmentation ?

hi, i need a help please i want to know how i measure a threshold value to use it in a wavelet_based image segmentation ? if any one has a code , function or any answer that help me please send it thanks for your time

[mona]

note: my image is the gray scale image

Answer 1

[Amith Kamath]

If you are looking at segmentation in general, and tuning parameters to do so, I would recommend using http://www.mathworks.com/matlabcentral/fileexchange/38484-segmenttool-an-interactive-gui-for-segmenting-images.

For specific cases of wavelet transformed images, the threshold would depend on the scale and frequency you want to focus on.

[mona]

thanks Amith Kamath what about the haar wavelet transform ?

[mona]

i need to know how to calculate the threshold value? i type a code for this problem and i can't use the GUI, So if there is away to measure the threshold or function calculate it you will helped me a lot

[Amith Kamath]

As far as I can tell, there is no analytic threshold value which can be preset in your code, and so it would depend on specific cases. http://eeweb.poly.edu/iselesni/lecture_notes/WaveletQuickStudy_expanded.pdf has some good discussion about this.

[mona]

thanks Amith Kamath for your help