Piotr's Image & Video Matlab Toolbox使用

想提取hog特征，大牛向我推荐Piotr's Image & Video Matlab Toolbox，http://vision.ucsd.edu/~pdollar/toolbox/doc/index.html网站上下载，下载之后 addpath(genpath('c:\toolbox'));
savepath; toolboxCompile;

运行

I=double(imread('cameraman.tif'));

figure(1); im(I)

tic, H=hog(I,8,9); toc, V=hogDraw(H,25); figure(2); im(V)
还是有错误。

Error
using gradientMex

I has incorrect type.

Error in gradientMag (line 51)

else [M,O]=gradientMex('gradientMag',I,channel,full); end

Error in hog (line 72)

[M,O] = gradientMag( I );

resample下就好了

I=imResample(single(imread('cameraman.tif')),[250 250])/255;

figure(1); im(I)

tic, H=hog(I,8,9); toc, V=hogDraw(H,25); figure(2); im(V)

成功了

I=imResample(single(imread('cameraman.tif')),[250 250])/255;

figure(1); im(I)

tic, H=hog(I,8,9); toc, V=hogDraw(H,25); figure(2); im(V)

成功