how to read and write a gray AVI video file in 16 bit

Question

Boissonneau 2024-1-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2073721-how-to-read-and-write-a-gray-avi-video-file-in-16-bit

回答： Boissonneau 2024-1-24

在 MATLAB Online 中打开

I want save a grayscale matrix in a videofile without lost information.

And i want to read this file to compare it.

I try this :

% Create and save
Fmt = 'Grayscale AVI';
% Fmt = 'Uncompressed AVI';
vidObj = VideoWriter('video16.avi',Fmt);
open(vidObj);
for i = 1:100
    gray_img = rand(480, 640) * 2^16;
    writeVideo(vidObj, double(gray_img./2^16));
end
close(vidObj);
figure;imagesc(gray_img);colormap gray;impixelinfo;
disp( mean2(gray_img) );
% Read and show
vidObj = VideoReader('video16.avi');
for k = 1 : vidObj.NumFrames
    frame = read(vidObj, k);
    imshow(frame);
end
figure;imagesc(frame);colormap gray;impixelinfo;
disp( mean2(frame) );

but my read frames are always in 8 bit format

Any help should be appreciate

Thanks

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Answer 1

ScottB 2024-1-24

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https://ww2.mathworks.cn/matlabcentral/answers/2073721-how-to-read-and-write-a-gray-avi-video-file-in-16-bit#answer_1396471

The command VideoWriter has an attribute called "VideoBitsPerPixel" which is the number of bits per pixel in each output frame.

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Answer 2

Boissonneau 2024-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2073721-how-to-read-and-write-a-gray-avi-video-file-in-16-bit#answer_1396511

在 MATLAB Online 中打开

Thanks, for this answer but :

for the both format i have a error message

"Unable to set the 'VideoBitsPerPixel' property of class 'VideoWriter' because it is read-only."

Fmt = 'Grayscale AVI';
% Fmt = 'Uncompressed AVI';
vidObj = VideoWriter('video16.avi',Fmt);
vidObj.VideoBitsPerPixel = 16;
Unable to set the 'VideoBitsPerPixel' property of class ''VideoWriter'' because it is read-only.