Detection problem in a video for hand detection?
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I'm doing hand detection and tracking using skin color method. I'm not using Viola-Jones method as it requires training. The problem is that when i use the detection code(shown below) the hand is detected but when i use the same code in a video nothing is detected.
The code for the detection of hand is;
%Read the image, and capture the dimensions
tic;
img_orig = imread('65.png');
height = size(img_orig,1);
width = size(img_orig,2);
%Initialize the output images
out = img_orig;
bin = zeros(height,width);
%Convert the image from RGB to YCbCr
img_ycbcr = rgb2ycbcr(img_orig);
Cb = img_ycbcr(:,:,2);
Cr = img_ycbcr(:,:,3);
%Detect Skin
[r,c,v] = find(Cb>=67 & Cb<=137 & Cr>=133 & Cr<=173);
numind = size(r,1);
numcol = size(r,2);
%Mark Skin Pixels
for i=1:numind
out(r(i),c(i),:) = [0 0 255];
bin(r(i),c(i)) = 1;
end
% Detect radius
[x1,y1] = find(out(:,:,3) == 255, 1,'first');
[x2,y2] = find(out(:,:,3) == 255, 1, 'last');
% Detect Hand Center
hits = 0;
hitsArr = zeros(1,height);
for i = 1:height
hits = numel(find(bin(i,:) == 1));
hitsArr(i) = hits;
end
maxHitr = max(hitsArr);
y = find(hitsArr == maxHitr,1,'first');
hitsArr = zeros(1,width);
for i = 1:width
hits = numel(find(bin(:,i) == 1));
hitsArr(i) = hits;
end
maxHitc = max(hitsArr);
x = find(hitsArr == maxHitc,1,'first');
label = 'Hand';
position = [x y abs(y2-y1)/2; x y 1];
img_out = insertObjectAnnotation(img_orig,'Circle',position,label);
imshow(img_orig);
figure; imshow(img_out);title('Detected hand');
imwrite(img_out,'hand_detect.jpg');
% viscircles([x y],abs(y2-y1)/2,'EdgeColor','r');
% viscircles([x y],1,'EdgeColor','r');
% figure; imshow(out);
figure; imshow(bin);
toc;
and image for the detected hand is
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/156827/image.jpeg)
Now when i use the code for detection in a video nothing is detected.
the code is this;
filename = 'hand_2.wmv';
video = vision.VideoFileReader(filename);
player = vision.DeployableVideoPlayer('Location', [10,100],'FrameRate',30);
while ~isDone(video)
img_orig = step(video);
% Capture the dimensions
height = size(img_orig,1);
width = size(img_orig,2);
%Initialize the output images
out = img_orig;
bin = zeros(height,width);
%Convert the image from RGB to YCbCr
img_uint8 = uint8(img_orig);
img_ycbcr = rgb2ycbcr(img_uint8);
Cb = img_ycbcr(:,:,2);
Cr = img_ycbcr(:,:,3);
%Detect Skin
[r,c,v] = find(Cb>=67 & Cb<=137 & Cr>=133 & Cr<=173);
numind = size(r,1);
%Mark Skin Pixels
for i=1:numind
out(r(i),c(i),:) = [0 0 255];
bin(r(i),c(i)) = 1;
end
% Detect radius
[x1,y1] = find(out(:,:,3) == 255, 1,'first');
[x2,y2] = find(out(:,:,3) == 255, 1, 'last');
if isempty(y1) && isempty(y2)
y1 = 2; y2 = 0;
end
% Detect Hand Center
hits = 0;
hitsArr = zeros(1,height);
for i = 1:height
hits = numel(find(bin(i,:) == 1));
hitsArr(i) = hits;
end
maxHitr = max(hitsArr);
y = find(hitsArr == maxHitr,1,'first');
hitsArr = zeros(1,width);
for i = 1:width
hits = numel(find(bin(:,i) == 1));
hitsArr(i) = hits;
end
maxHitc = max(hitsArr);
x = find(hitsArr == maxHitc,1,'first');
label = 'Hand';
position = [x y abs(y2-y1)/2; x y 1];
img_out = insertObjectAnnotation(img_orig,'Circle',position,label);
step(player, img_out);
end
release(video);
release(player);
What could be the problem?
3 Kommentare
Awais Bilal
am 20 Jun. 2015
Yash Gajjar
am 9 Jan. 2020
I'm working on a similar project, but I need to use webcam and not video. I have tried changing out the image code to webcam compatible code but with no success. It would be great if you could help me with this issue...thx! -ygajjar005@gmail.com
Antworten (1)
Image Analyst
am 16 Feb. 2014
You might need to adjust your Cb and Cr thresholds. Otherwise use the debugger to figure out where it's coming out zeros when it should be giving something non-zero.
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