poly2maskfine

版本 1.0.0 (2.3 KB) 作者: Dirk-Jan Kroon

Computes an anti-aliased mask from a polygon, like poly2mask but then accurate anti aliased

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更新时间 2024/4/25

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poly2maskfine Computes an anti-aliased mask from a polygon.

GrayMask = poly2maskfine(X, Y, M, N) computes an accurate anti-aliased mask

representing the polygon defined by the vertices in vectors X and Y.

The output GrayMask is a double array of size M x N:

- Pixels on the edge of the polygon are set to a value representing

the area of overlap between the polygon and the pixel's square area.

- Pixels inside the polygon (defined by X and Y) are set to 1.

- Pixels outside the polygon (defined by X and Y) are set to 0.

poly2maskfine automatically closes the polygon if it's not already closed.

Example:

% Create a 100x120 grayscale image
M = 100; N = 120;
% Create an ellipse
theta = linspace(0, 2*pi, 100); % 100 points for the circle contour
x_ellipse = 60 + 55 * cos(theta); % x coordinates of the circle contour
y_ellipse = 50 + 40 * sin(theta); % y coordinates of the circle contour
% Compute the anti-aliased mask for the ellipse
GrayMask = poly2maskfine(x_ellipse, y_ellipse, M, N);
figure, imshow(GrayMask)

引用格式

Dirk-Jan Kroon (2024). poly2maskfine (https://www.mathworks.com/matlabcentral/fileexchange/164491-poly2maskfine), MATLAB Central File Exchange. 检索来源 2024/10/2.