How to change Y-axis coordinates of meshgrid

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Med Future
Med Future 2022-3-20
回答： Image Analyst 2022-3-22
Hello Everyone, i hope you are doing well. I am creating binary Image in which background is black and forground is white
when i create grid of 1000x1000. The X-axis start from 0 to 1000 but Y axis is upper side 0 to 1000 as you can see in the following image , but i want Y axis to be start from Lower 0 to 1000
How can i do that in MATLAB
imSz = 1000; % assuming images are 1000x1000
imbg = false(imSz); % background "color"
imfg = ~imbg(1,1);
[~,Y] = meshgrid(1:imSz); % make a grid
% black and white image
BW = imbg;
imshow(BW)
axis on;

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采纳的回答

Image Analyst
Image Analyst 2022-3-22
Ran in:
That's the convention for matrixes and images - the y=1 value is at the top. If you want to reverse it use "axis xy" like
grayImage = imread('cameraman.tif');
[rows, columns, numberOfColorChannels] = size(grayImage);
subplot(2, 1, 1);
imshow(grayImage);
axis('on', 'xy');
subplot(2, 1, 2);
imshow(flipud(grayImage));
axis('on', 'xy');

更多回答（2 个）

KSSV
KSSV 2022-3-20
>> hax = gca;
hax.YTickLabel = flipud(hax.YTickLabel);
yanqi liu
yanqi liu 2022-3-21
Ran in:
imSz = 1000; % assuming images are 1000x1000
imbg = false(imSz); % background "color"
imfg = ~imbg(1,1);
[~,Y] = meshgrid(1:imSz); % make a grid
% black and white image
BW = imbg;
imshow(BW)
axis on;
axis xy

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