I have applied histogram on the v-component of hsv image how can i now convert it back to colour image

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sachit 2014-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/167351-i-have-applied-histogram-on-the-v-component-of-hsv-image-how-can-i-now-convert-it-back-to-colour-ima

回答： Image Analyst 2014-12-20

i have selected a color image, after reading it i have converted it to hsv image, then i have extracted its v-component, then applied histogram to the v-component, after this the image is of 256*1 matrix. how i now obtain the color image using the enhanced value of v after combining h s & v components

X = imread('4.1.05.tiff'); % read the image [o k]=size(X); S=rgb2hsv(X); [m n]=size(S); subplot(2,2,1) imshow(S) %convert the colour image to HSV V=S(:,:,3); subplot(2,2,2) imshow(V) subplot(2,2,3) [COUNTS,f] = imhist(V) stem(f,COUNTS); figure() imshow([COUNTS,f])

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Image Analyst 2014-12-20

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Answer 1

Image Analyst 2014-12-20

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https://ww2.mathworks.cn/matlabcentral/answers/167351-i-have-applied-histogram-on-the-v-component-of-hsv-image-how-can-i-now-convert-it-back-to-colour-ima#answer_162932

在 MATLAB Online 中打开

Try this:

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;
rgbImage = imread('peppers.png'); % read the image
[rows1, columns1, numberOfChannels1] = size(rgbImage);
subplot(2, 2, 1);
imshow(rgbImage);
title('RGB Image', 'FontSize', fontSize);
hsvImage=rgb2hsv(rgbImage);
[rows2, columns2, numberOfChannels2]=size(hsvImage)
subplot(2, 2, 2);
imshow(hsvImage)  % Convert the colour image to HSV
title('HSV image, coded as RGB (meaningless)', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
H = hsvImage(:,:,1);
S =hsvImage(:,:,2);
V = hsvImage(:,:,3);
subplot(2, 2, 3);
imshow(V)
title('V Channel', 'FontSize', fontSize);
subplot(2, 2, 4);
[COUNTS,f] = imhist(V) 
bar(f,COUNTS);
grid on;
title('V Channel Histogram', 'FontSize', fontSize);
figure()
improvedHSVImage = cat(3, H, S, mat2gray(V));
improvedRGBImage = hsv2rgb(improvedHSVImage);
imshow(improvedRGBImage)
title('Improved RGB Image', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);