A loop that can repetitively extract features?

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Kelly Howard 2015-10-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/246782-a-loop-that-can-repetitively-extract-features

编辑： Walter Roberson 2015-10-5

Hi guys,

i would like to seek help! i'm trying to do a extract HOG feature from a list of UCF sport videos and save the size of hoefeature into a folder. how can i do it?

clc; clear; close;
% video data
vidObj=VideoReader('Kicking-Side-004.avi');
video=read(vidObj);
img=zeros(size(video,1),size(video,2),size(video,4));
for j=1:size(video,4)
    img(:,:,j)=im2single(rgb2gray(video(:,:,:,j)));
end
% spatio temporal orientation filter
SOE = SpatialTemporalEnergy(img,'G3',3,0);
% seperate motion energy from static and unstructure energy
structure=max(SOE(:))/100;
SOE=max(bsxfun(@minus,SOE(:,:,:,1:end-1),SOE(:,:,:,end)+structure),0);
% normalization
SOE=bsxfun(@rdivide,SOE,sum(SOE,4)+eps);
% dense HOE
hoefeature=HOE(SOE,4,4,4);
% dense HOG
[gradient_x,gradient_y] = gradient(img);
hogfeature = HOG(gradient_x,gradient_y,4,4,4,8);