image normalization
in [Matlab]
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From: ImageAnalyst on 12 Jun 2010 19:32 On Jun 12, 5:41 pm, "Ahmad Alkandri" <a_alkan...(a)yahoo.com> wrote: > how would i normalize the result to be between 0 and 1 ? ------------------------------------------------------------------------------ Doesn't mat2gray do that? I've never used that before, or even knew about it. I always just use the usual formula (which I'm sure you intuitively know) norm = input/ (max of input), or perhaps norm = (input - min of input) / (max of input - min of input)
From: Matt J on 13 Jun 2010 07:30 "Ahmad Alkandri" <a_alkandri(a)yahoo.com> wrote in message <hv0gtd$43l$1(a)fred.mathworks.com>... > hi all > > how to normalize an image from 0 to 1 ? > > what i'm doing is as foloows : > > BG_img = imread('BG.tiff'); ====== Don't forget to pre-convert to doubles BG_img = double(imread('BG.tiff')); Otherwise BG_img will be an integer type and MATLAB will round all arithmetic operations that you apply to it, esp. the fft
From: Ahmad Alkandri on 21 Jun 2010 06:44
ok the function mat2gray would not normilize the power spectrum of the image .... it will output a matrix of 1's only ..... an idea how to normilize the PSD output to between [0 1] ... ? |