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how to change video gradient to improve edge detection
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Hi All,
Could you please give me a hand! I am currently writing up some cell analysis code that looks at a cell's radius and see's its change in size over time. At the moment I have gotten the edge detection software working fine but the video seems to be picking up uncessesary noise and I would really like to improve the image quality beofre I move to the next stage.
This is my code for the edge detection:
%% vidobj is input VidioReader Object
vidobj = VideoReader('VID00126.AVI');
numframes = get(vidobj, 'NumberOfFrames');
%% finalvid is output VideoWriter Object
finalvid = VideoWriter('edgedetVID00126.avi');
finalvid.FrameRate = vidobj.FrameRate;
open(finalvid);
c = 1;
for ii = 1 : 17
if rem(numframes,ii) == 0
if c < ii
c = ii;
end
if c == 1
c = 10;
end
end
end
startframe = 1;
stopframe = c;
while (stopframe <= numframes)
frames = read(vidobj, [startframe stopframe]);
for l = 1:size(frames,4)
temp = frames(:,:,:,l);
temp = rgb2gray(temp);
detectedge = edge(temp, 'canny');
detectedge = single(detectedge);
writeVideo(finalvid, detectedge);
end
startframe = startframe + c;
stopframe = stopframe + c;
end
close(finalvid);
I have been trying to use the following link's code to change the gradient but it only seems to be working for images, could anyone tell me what I could do?
Thanks in advance everyone.
Ben
6 个评论
darova
2020-4-9
- At the moment I have gotten the edge detection software working fine but the video seems to be picking up uncessesary noise
You think it happens during writing video? You have good quality in MATLAB?
采纳的回答
darova
2020-4-9
Try this
I0 = imread('Screenshot 2020-04-09 at 15.50.08.png');
I1 = im2bw(I0,graythresh(I0)-0.03); % binarize image with treshold
I2 = bwareaopen(I1,50); % remove small regions (50 pixels)
I3 = edge(I2);
II = imfuse(I0,I3);
imshow(II)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/283200/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/283201/image.png)
Looks like something simple but im not good at this
There is another person who specializes on this. But i don't like him
2 个评论
darova
2020-4-14
Use this to read video
v = VideoReader('xylophone.mp4');
n = v.NumberOfFrames;
for i = 1:n
I0 = read(v,i);
% I0 = imread('Screenshot 2020-04-09 at 15.50.08.png');
I1 = im2bw(I0,graythresh(I0)-0.03); % binarize image with treshold
I2 = bwareaopen(I1,50); % remove small regions (50 pixels)
I3 = edge(I2);
II = imfuse(I0,I3);
imshow(II,'initialmagnification','fit')
pause(0.1)
end
- Would you happen to know their name so I can contact them as well?
Sure, here is he: Image Analyst
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