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【图像算法】图像特征：三个图像显著性区域特征提取方法
SkySeraph Aug 11st 2011 HQU
Email：zgzhaobo@gmail.com QQ：452728574
Latest Modified Date：Aug 11st 2011 HQU
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》第一种方法：
原理：Frequency-tuned Salient Region Detection.CVPR.2009
定义：
简述：
三步，滤波+颜色空间转换+计算SaliencyMap(见源码)
效果：
待测试图(后同)
结果1：(原作者代码测试结果)
结果2：（我用OpenCV改写的代码测试结果）
结果3：（我的改进测试(空间选择不同)）
源码(matlab)：
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%---------------------------------------------------------% Read image and blur it with a 3x3 or 5x5 Gaussian filter%---------------------------------------------------------img = imread(‘input_image.jpg‘);%Provide input image pathgfrgb = imfilter(img, fspecial(‘gaussian‘, 3, 3), ‘symmetric‘, ‘conv‘);%---------------------------------------------------------% Perform sRGB to CIE Lab color space conversion (using D65)%---------------------------------------------------------cform = makecform(‘srgb2lab‘, ‘whitepoint‘, whitepoint(‘d65‘));lab = applycform(gfrgb,cform);%---------------------------------------------------------% Compute Lab average values (note that in the paper this% average is found from the unblurred original image, but% the results are quite similar)%---------------------------------------------------------l = double(lab(:,:,1)); lm = mean(mean(l));a = double(lab(:,:,2)); am = mean(mean(a));b = double(lab(:,:,3)); bm = mean(mean(b));%---------------------------------------------------------% Finally compute the saliency map and display it.%---------------------------------------------------------sm = (l-lm).^2 + (a-am).^2 + (b-bm).^2;imshow(sm,[]);%-------------------------------------------------------- |
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》第二种方法：
原理：
Y. Zhai and M. Shah. Visual attention detection in video sequences using spatiotemporal cues. In ACM Multimedia, pages 815–824. ACM,2006.
定义：
效果：
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》第三种方法：
原理：http://www.klab.caltech.edu/~xhou/projects/spectralResidual/spectralresidual.html
源码（matlab）：
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clearclc%% Read image from fileinImg = im2double(rgb2gray(imread(‘yourImage.jpg‘)));inImg = imresize(inImg, 64/size(inImg, 2));%% Spectral ResidualmyFFT = fft2(inImg);myLogAmplitude = log(abs(myFFT));myPhase = angle(myFFT);mySpectralResidual = myLogAmplitude - imfilter(myLogAmplitude, fspecial(‘average‘, 3), ‘replicate‘);saliencyMap = abs(ifft2(exp(mySpectralResidual + i*myPhase))).^2;%% After EffectsaliencyMap = mat2gray(imfilter(saliencyMap, fspecial(‘gaussian‘, [10, 10], 2.5)));imshow(saliencyMap); |
效果：
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Author: SKySeraph
Email/GTalk: zgzhaobo@gmail.com QQ：452728574
From： http://www.cnblogs.com/skyseraph/
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原文地址：http://www.cnblogs.com/GarfieldEr007/p/5459634.html
