VLFeat-使用matlab版本计算HOG

下载 VLFeat
0.9.20    http://www.vlfeat.org Let 

VLFEATROOT

 denote
this directory. VLFeat must be added to MATLAB search path by running the 

vl_setup

 command
found in the 

VLFEATROOT/toolbox

 directory.
From MATLAB prompt enter：

run('VLFEATROOT/toolbox/vl_setup')

Example computing
and visualizing HOG features

img = imread('lena.jpg');
imgs = im2single(rgb2gray(img));
hog = vl_hog(imgs, 8 , 'verbose');
imhog = vl_hog('render', hog, 'verbose');
clf;imagesc(imhog);colormap gray;