Binary image conversion from real image

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Turbulence Analysis 2020-12-15

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https://ww2.mathworks.cn/matlabcentral/answers/694765-binary-image-conversion-from-real-image

评论： Turbulence Analysis 2020-12-16

Hi,

I intend to obtain the binary image. The intensity values of real image (varies from 0 to 4096) stored in the matrix, let's say 'h' . I tried to obtain the binarized images with the follwoing code, but I got some wierd image.. Do I need to play with the thresold ??.. In my binarized image, I am seeing any subject, instead it's just blank / white image..

BW = imbinarize(h,'global');
imshow (BW);

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Answer 1

Subhadeep Koley 2020-12-16

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Hi, imbinarize expects pixel values of data type double and single to be in the range [0, 1]. We should use the rescale function to adjust pixel values to the expected range.

% Load the original image
load h.mat
% Rescale "h" to adjust its pixel values in [0,1]
h = rescale(h);
% Binarize "h"
BW = imbinarize(h, 'global');
% Visualize results
figure
imagesc([h,BW])
axis image off
title("Original Image   |   Binarized Image")