Take pixels from input image

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Sara Salimi 2016-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/309780-take-pixels-from-input-image

回答： Image Analyst 2016-10-30

How to take pixels from an input image by using Gaussian sampling?

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Image Analyst 2016-10-29

What does that mean? What do you want as an output? A 1-D vector of intensity values? What is Gaussian Sampling? Do you mean the locations are to be taken like in a shotgun pattern concentrated in the middle of the image? Please include more info, such as a diagram.

Sara Salimi 2016-10-30

编辑：Sara Salimi 2016-10-30

Dear Image Analyst,

Many thanks for your attention.

I want to do sampling since I do not want to do some specific process on all pixels of image. Yes, I want to do shotgun pattern like sampling in an image (i.e.,denser sampling in the middle of image). The output should be the coordinates of sampled pixels. I will be thankful if you guide me.

Thanks in advance.

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Answer 1

Image Analyst 2016-10-30

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/309780-take-pixels-from-input-image#answer_241316

在 MATLAB Online 中打开

Try this:

numPoints = 5000;
xCenter = 1000;
yCenter = 1000;
sigmax = 500;
sigmay = 500;
x = xCenter + sigmax * randn(numPoints, 1);
y = yCenter + sigmay * randn(numPoints, 1);
plot(x, y, 'b.', 'MarkerSize', 8);
grid on;
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')