How to change Y-axis coordinates of meshgrid

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;

Answer 1

[Image Analyst]

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');

Answer 2

[KSSV]

>> hax = gca;
hax.YTickLabel = flipud(hax.YTickLabel);

[Med Future]

@KSSV not like that,

[~,Y] = meshgrid(1:imSz); % make a grid

in this command what should i change

[KSSV]

[~,Y] = meshgrid(imSz:-1:1); % make a grid

[Med Future]

@KSSV Still not working. same result as above

Answer 3

[yanqi liu]

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

[Med Future]

@yanqi liu What changes you have made?

[yanqi liu]

yes，sir，use axis xy to make the coordinate as norma xy axis， not use image axis