How can I paint a list of pixels in a matlab image?

Question

Wanderson 2012-1-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26233-how-can-i-paint-a-list-of-pixels-in-a-matlab-image

I'm working with a lot of images here and I have to find all the pixels above a scalar value and paint all them into any color.

I've all the indexes of this pixels but I don't know how can I paint them now...

Thx for the help again.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2012-1-16

In which format are the "images" represented? Printed on paper, as JPEGs on the harddisk or as arrays in Matlab? What does "paint all of them in any color" exactly mean?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Image Analyst 2012-1-16

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26233-how-can-i-paint-a-list-of-pixels-in-a-matlab-image#answer_34273

在 MATLAB Online 中打开

Here's the way to do it without using slow loops:

grayImage = imread('coins.png');
subplot(2,2,1);
imshow(grayImage);
binaryImage = uint8(255 * ~(grayImage > 150));
subplot(2,2,2);
imshow(binaryImage, []);
uniformImage = uint8(255 * ones(size(grayImage)));
zeroImage = uint8(255 * zeros(size(grayImage)));
rgbImage = cat(3, uniformImage, binaryImage, zeroImage);
subplot(2,2,3);
imshow(rgbImage);

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Wanderson 2012-1-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26233-how-can-i-paint-a-list-of-pixels-in-a-matlab-image#answer_34266

LoL, sorry I'll try to explain it better now.

I have one image 320x256 as arrays in matlab. I use the function "find" to find all the pixels between 0 and 0.5 and I have to paint this set of pixel from "yellow" for example and them I'll do the same thing to find another set of pixel between 0.5 and 1.0 and paint this new set to "red".

better now?