HOG in Matlab - split images into blocks and calculate the orientations -


enter image description herei have problem. have implemented code split image blocks calculating orientations each block, code:

a=imread('009055_0m54.jpg'); a1=imresize(a,[300,340]);   cbs=100;   ck1=1; cblock(:,:,:,1)=a1(1:100,1:100,:);   cblock(:,:,:,5)=a1(101:200,1:100,:);   cblock(:,:,:,9)=a1(201:300,1:100,:);   ci1=1:3   ck1=ck1+1;   cj1=1:3   row1=80 ;   row2=180;   cblock(:,:,:,ck1)=a1( (cbs*(ci1-1)+1:cbs*(ci1-1)+cbs), ((row1+1)+(cj1-1)*80:row2+(cj1-1)*80),:);     ck1=ck1+1;   [featurevector, hogvisualization] = extracthogfeatures(cblock(:,:,:,ck1));  figure;  imshow(cblock(:,:,:,ck1)); hold on;  plot(hogvisualization);         end     end

it works, blocks black, without image. if example edit line:

imshow(cblock(:,:,:,1)); hold on;

the program shows me 6 equal block, works well! example, edit line in:

imshow(cblock(:,:,:,3)); hold on;

the program shows me 6 blocks, of 5 equal blocks , first block such black block, without image! in fact when used main code:

imshow(cblock(:,:,:,ck1)); hold on;

the block 3 black code! please, me! everyone

to try replicate 1 need image comes , extracthogfeatures function ?


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