How to get normalized silhouette image from video

Question

Kong 2020-3-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510180-how-to-get-normalized-silhouette-image-from-video

评论： Kong 2020-3-10

采纳的回答： Image Analyst

weighted17.jpg

在 MATLAB Online 中打开

I want to get normalized silhouette image.

However, I got this images when I use the below code.

Figure 1 Figure 2

Figure 3 (I want to get this image that normalized at the center of the image)

function Y=normalize8(X)
%% Init. operations
X=double(X);
[a,b]=size(X);
%% Adjust the dynamic range to the 8-bit interval
max_v_x = max(max(X));
min_v_x = min(min(X));
Y=ceil(((X - min_v_x*ones(a,b))./(max_v_x*(ones(a,b))-min_v_x*(ones(a,b))))*255);
end
clear all
close all
RGB = imread('weighted17.jpg');
I = rgb2gray(RGB);
figure
imshow(I)
Y=normalize8(I)
figure
imshow(Y)

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Answer 1

Image Analyst 2020-3-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/510180-how-to-get-normalized-silhouette-image-from-video#answer_419516

编辑：Image Analyst 2020-3-10

在 MATLAB Online 中打开

Use

mask = bwareafilt(mask, 1);

to extract the largest blob.

Or take blobs just 64 pixels and bigger with this:

mask = bwareafilt(mask, [64, inf]);

But the BIG problem is that the image seems to be either an indexed or dithered image, or an image that had all the quality JPEG'ed out of it. NEVER use JPG images for image analysis. See if you can get the full resolution, uncompressed version of the image somehow. This image is virtually useless.