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大神求解释一下代码的意思，通俗点楼主新手啊~

while ~isDone(hbfr)

[y, cb, cr] = step(hbfr);

[cb, cr] = step(hcr, cb, cr);

image = step(hcsc, cat(3,y,cb,cr));

y = im2single(y);

y = y-mean(y(:));

fg_image = step(hof, y);

[area, bbox] = step(hblob, fg_image);

Idx = bbox(1,:) > line_row;

ratio = zeros(1, length(Idx));

ratio(Idx) = single(area(1,Idx))./single(bbox(3,Idx).*bbox(4,Idx));

ratiob = ratio > 0.4;

count = int32(sum(ratiob));

bbox(:, ~ratiob) = int32(-1);

y2 = step(hshapeins1, image, bbox);

y2(22:23,:,:) = 255;

y2(1:15,1:30,:) = 0;

image_out = step(htextins, y2, count);

step(hVideoOrig, image);

step(hVideoFg, fg_image);

step(hVideoRes, image_out);

end