How to sum up about 3-4 color frames and only show the brightest frame. Matlab
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obj = VideoReader('C:\Users\Robotics\Pictures\Saved Pictures\Lightfile\Prelight.MOV');
for img = 1:obj.NumberOfFrames;
filename = strcat('frame',num2str(img),'.jpg');
b = read(obj,img);
imwrite(b,filename);
end
I have this code that reads the file and get all frames, but I need it to sum up about 3-5 frames then take the brightest frame and store it. Can someone help please!!
2 件のコメント
OCDER
2017 年 9 月 27 日
編集済み: OCDER
2017 年 9 月 27 日
Can you explain what you mean to "sum up 3-5 frames and take the brightest frame"? The sum of 3-5 frames will always be the brightest frame.
Since an image is a matrix, you can simply add images together using matrix math, but use double format (im2double) so that the sum of 3-5 images doesn't exceed the maximum value given a number format (ex: uint8 max value is 255). Rescale all image intensities at the end to prevent flickering effects by inconsistent rescaling.
採用された回答
Walter Roberson
2017 年 9 月 27 日
編集済み: Walter Roberson
2017 年 9 月 28 日
The below code assumes that the frames are RGB.
The below code does not attempt to detect intervals of flash and determine the best out of the interval: it takes the frames frames_per_group at a time and determines the brightest of that group.
obj = VideoReader('C:\Users\Robotics\Pictures\Saved Pictures\Lightfile\Prelight.MOV');
frameidx = 0;
frames_per_group = 5;
frame_history = [];
frameidx_history = [];
while hasFrame(obj)
frameidx = frameidx + 1;
groupidx = groupidx + 1;
b = readFrame(obj);
frame_history = cat(4, frame_history, b);
frameidx_history(end+1) = frameidx;
if size(frame_history, 4) == frames_per_group
maxbrightness = -inf;
maxbrightnessidx = -inf;
for K = 1 : frame_per_group;
grayframe = rgb2gray(frame_history(:,:,:,K));
thisbrightness = sum(grayframe(:));
if thisbrightness > maxbrightness
maxbrightness = thisbrightness;
maxbrightnessidx = K;
end
end
bestframe = frame_history(:,:,:,maxbrightnessidx);
bestframeidx = frameidx_history(maxbrightnessidx);
filename = sprintf('frame%04d.jpg', bestframeidx);
imwrite(bestframe, filename);
frame_history = [];
frameidx_history = [];
end
end
(Code not tested)
8 件のコメント
Walter Roberson
2017 年 9 月 29 日
I do not know how a 360 degree camera might differ from a regular camera ? Is it just like a fish-eye lens with a single image, or is it multiple images at the same time?
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