Leo

Hi Victor,

It is a bit difficult to comment on the VL code as it isnt mine, but I think the difference comes from how the normalization of the cells on the boundary is treated.

The cells on the left and bottom boundary only belong to two blocks (or in some cases one). For example there is no block starting at a cell on the left boundary and extending to the left as that would take it outside the image. Thus a 256x256 image only has 63*63 blocks of size 2x2.

If I understand the VL code correctly ,hog.c line 927 and onward, it assumes that every cell belongs to 4 blocks. For the case of boudary cells, where this assumption does not hold, certain block normalization schemes are simply repeated to make up the four blocks, see lines 932-935. So if I am correct, for boundary cells, there should be repetitions in the final descriptor of the VL code. Though obviously you shouldnt cite me on this :)

Hope this helps.

Leo

Hi fairy,

lcc is not a cpp compiler. Using the Visual Studio compiler I think the following should do the trick.

in GBCC.cpp change line 24 to

saved_logs[j] = log(j+1)/log(2);

line 115 to

if (diff_labels[nl]>0) bh-=diff_labels[nl]*(log(diff_labels[nl])/log(2)-log(sum_W)/log(2));

line 151 to

if(diff_labels_l[nl]>0) ch-=(diff_labels_l[nl])*(log(diff_labels_l[nl])/log(2)-log(sum_l)/log(2));

and line 152 to

if(diff_labels_r[nl]>0) ch-=(diff_labels_r[nl])*(log(diff_labels_r[nl])/log(2)-log(sum_W-sum_l)/log(2));

Hope this solves it.

Leo

Hi fairy,

It would seem that the function is not in matlab's search path. You can run

addpath(genpath(cd))

Leo

Hi Victor,

It is a bit difficult to comment on the VL code as it isnt mine, but I think the difference comes from how the normalization of the cells on the boundary is treated.

The cells on the left and bottom boundary only belong to two blocks (or in some cases one). For example there is no block starting at a cell on the left boundary and extending to the left as that would take it outside the image. Thus a 256x256 image only has 63*63 blocks of size 2x2.

If I understand the VL code correctly ,hog.c line 927 and onward, it assumes that every cell belongs to 4 blocks. For the case of boudary cells, where this assumption does not hold, certain block normalization schemes are simply repeated to make up the four blocks, see lines 932-935. So if I am correct, for boundary cells, there should be repetitions in the final descriptor of the VL code. Though obviously you shouldnt cite me on this :)

Hope this helps.

Leo

how to write it in matlab
plz help to run the code in matlab