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how to find object map from saliency map of an image?????

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Sansri Basu
Sansri Basu 2014-3-14
评论： Prof M S Prasad 2024-1-13
The codings that i used to find the saliency map of an image is given below:
%%Read image from file
inImg = im2double(rgb2gray(imread('13.jpg')));
inImg = imresize(inImg, [64, 64], 'bilinear');
subplot(1,2,1);
imshow(inImg);title('Original Image');
%%Spectral Residual
FFT = fft2(inImg);
LogAmplitude = log(abs(FFT));
Phase = angle(FFT);
SpectralResidual = LogAmplitude - imfilter(LogAmplitude, fspecial('average', 3), 'replicate');
saliencyMap = abs(ifft2(exp(SpectralResidual + i*Phase))).^2;
%%After Effect
saliencyMap = mat2gray(imfilter(saliencyMap, fspecial('disk', 3)));
subplot(1,2,2);
imshow(saliencyMap, []);title('Saliency Map');
After getting the saliency map, i need to find the object map of the given input image which i am not able to. Please help!!!!!!!!!!
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Prof M S Prasad
Prof M S Prasad 2023-12-23
its an old problem . take histogram then select max value as threshold. then 1 sigma value. one of them would produce good result.
Prof M S Prasad
Prof M S Prasad 2024-1-13
hope you got the result.
threshold selection is based on Histogram. analyse one or we can set it 2 sigma.
i think it will give results.

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回答（1 个）

Image Analyst
Image Analyst 2014-3-26
It looks like it was just thresholded:
objectMap = saliencyMap > someThresholdValue;
I don't know what someThresholdValue might be. It's possible it might change on an image by image basis.
  2 个评论
Sansri Basu
Sansri Basu 2014-3-26
I tried using this code:
t=graythresh(saliencyMap); bw=im2bw(saliencyMap,t); imshow(bw);
But there was a blank output
Image Analyst
Image Analyst 2014-3-26
Maybe that didn't pick the correct threshold. Try it the way I suggested. You can use the interactive thresholding app in my File Exchange if you want. http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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