how can i convert detected grayscale image object back into rgb form?

Question

Atul Kumar 2021-11-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1592219-how-can-i-convert-detected-grayscale-image-object-back-into-rgb-form

评论： Atul Kumar 2021-11-22

I have to detect red chilies from plant. I got this result which shown in given figure but now i have to convert this final detected chili image back into red form, how can i do this?

This is the code which i used in this work.

i=imread('IMG_20210825_153633 - Copy.jpg');
subplot(2,2,1);
imshow(i)
G=rgb2gray(i);
subplot(2,2,2);
imshow(G);
A=i(:,:,1);
subplot(2,2,3);
imshow(A);
f=imsubtract(A,G);
subplot(2,2,4);
imshow(f)

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Answer 1

yanqi liu 2021-11-22

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https://ww2.mathworks.cn/matlabcentral/answers/1592219-how-can-i-convert-detected-grayscale-image-object-back-into-rgb-form#answer_837129

在 MATLAB Online 中打开

clc; clear all; close all;

i=imread('https://www.mathworks.com/matlabcentral/answers/uploaded_files/808449/image.jpeg');

i=imcrop(i,[5 8 632 291]);

subplot(2,2,1);

imshow(i)

G=rgb2gray(i);

subplot(2,2,2);

imshow(G);

A=i(:,:,1);

subplot(2,2,3);

imshow(A);

f=imsubtract(A,G);

subplot(2,2,4);

imshow(f)

bw = im2bw(mat2gray(f));

bw = imclose(bw, strel('disk', 5));

bw = bwareaopen(bw, 5);

i2 = i .* uint8(cat(3,bw,bw,bw));

figure; imshow(i2, []);

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Atul Kumar 2021-11-22

Thank you so much, it works.

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Answer 2

Yongjian Feng 2021-11-21

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编辑：Yongjian Feng 2021-11-21

How about changing the red chili area of the last image to alpha = 0 (so it is completely transparent). Then overlay on top of the original image

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Answer 3

Image Analyst 2021-11-21

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https://ww2.mathworks.cn/matlabcentral/answers/1592219-how-can-i-convert-detected-grayscale-image-object-back-into-rgb-form#answer_836954

Use the Color Thresholder app on the apps tab of the tool ribbon. Load your image then choose HSV color space, then adjust the thresholds, then export the function. Easy, but if you have trouble, let us know, but attach the original image 'IMG_20210825_153633 - Copy.jpg'