Plz rectify the error while doing background subtraction, i got error like "reference to non-existant field 'read'.i attach my code here, plz lookafter it

bk_downsample = 300; %The downsample factor for frame averaging disp('Opening video...') vob = mmread('D:\research work\videos\musicperformance\zyVfX0DFSHQ.flv',[],[]); frame=vid2im(mov,5); % vob = VideoReader(input_video); %A warning about being unable to read the number of frames is due to variable frame rate (normal) % frame = vob.read(inf); %Reads to end, takes a while, but now vob knows the number of frames vidHeight = vob.height; vidWidth = vob.width; nFrames = vob.nrFramesTotal;

%% First-iteration background frame background_frame = double(frame*0); disp('Calculating background...') for k = 1:bk_downsample:nFrames background_frame = background_frame + double(read(vob, k)); disp(k/(nFrames)*100) end

%background_frame = uint8(bk_downsample*background_frame/(nFrames)); background_frame = bk_downsample*background_frame/(nFrames);

%imshow(background_frame)

%% Second-iteration background frame %This section re-calculates the background frame while attempting to %minimize the effect of moving objects in the calculation

background_frame2 = double(frame*0); pixel_sample_density = im2bw(double(frame*0)); diff_frame = double(frame*0); stream_frame = diff_frame(:,:,1); bk_downsample = 50;

figure hold on for k = 1:bk_downsample:nFrames diff_frame = imabsdiff(double(read(vob, k)), background_frame); diff_frame = 1-im2bw(uint8(diff_frame),.25); pixel_sample_density = pixel_sample_density + diff_frame; stream_frame = stream_frame + (1-diff_frame)/(nFrames/bk_downsample); nonmoving = double(read(vob, k)); nonmoving(:,:,1) = nonmoving(:,:,1).*diff_frame; nonmoving(:,:,2) = nonmoving(:,:,2).*diff_frame; nonmoving(:,:,3) = nonmoving(:,:,3).*diff_frame; background_frame2 = background_frame2 + nonmoving; %pause disp(k/(nFrames)*100) end

background_frame2(:,:,1) = background_frame2(:,:,1)./pixel_sample_density; background_frame2(:,:,2) = background_frame2(:,:,2)./pixel_sample_density; background_frame2(:,:,3) = background_frame2(:,:,3)./pixel_sample_density;

imshow(uint8(background_frame2)) %imshow(stream_frame)