Extracting pixels from an image random
显示 更早的评论
Hello,
How can I extract 100 pixels color randomly from an image ?
采纳的回答
Guillaume
2019-6-1
One way:
row = randi(size(yourimage, 1), 100, 1); %select 100 row coordinates at random
col = randi(size(yourimage, 1), 100, 1); %and 100 columns to go with it
rgb = yourimage(sub2ind(size(yourimage), repmat(row, 1, 3), repmat(col, 1, 3), repmat(1:3, 100, 1)));
%for pretty display
table(row, col, rgb)
更多回答（1 个）
Image Analyst
2019-6-1
Here is another way:
% Load standard demo RGB image:
rgbImage = imread('peppers.png');
% Extract the individual red, green, and blue color channels:
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
% Get 100 random locations:
locations = randperm(numel(redChannel), 100)
% Get R, G, and B values at those locations:
redValues = redChannel(locations)
greenValues = greenChannel(locations)
blueValues = blueChannel(locations)
类别
在 帮助中心 和 File Exchange 中查找有关 Image Processing Toolbox 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
