white ellipse in black background

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tala 2017-7-31

评论： tala 2017-8-1

hi every one.

i'm a beginner in matlab. i need to draw a white ellipse in a black background(512*512) as shown in the picture attached below.

i also have the center and axis of the ellipse.

i just need to implement the equation of ellipse:

if (x-a)2/A2 + (y-b)2/B2<1 assign 1 to pixels inside the ellipse
if (x-a)2/A2 + (y-b)2/B2>=1 assign 0 to pixels outside the ellipse

center of ellipse: (a,b)

A & B: min&max axis of ellipse

Walter Roberson 2017-7-31

编辑：Walter Roberson 2017-7-31

[x, y] = meshgrid(1:512, 1:512);
result = (x-a).^2./A.^2 + (y-b).^2./B.^2 < 1;

tala 2017-8-1

thanks a lot for your answer

tala 2017-8-1

could you please tell me now how can i rotate this ellipse for example 80 degrees?

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