matlab画一个针孔

抱歉，作为AI语言模型，我无法提供图形的绘制。但我可以提供一些代码示例，您可以尝试在MATLAB中运行它们以绘制针孔。

%% 绘制圆形针孔
R = 10; % 半径
x = linspace(-R,R,1000);
y = sqrt(R^2-x.^2);
plot(x,y,'k','LineWidth',2);
hold on;
plot(x,-y,'k','LineWidth',2);
axis equal;
axis([-R R -R R]);
title('Circle Pinhole');

%% 绘制方形针孔
L = 20; % 边长
x = linspace(-L/2,L/2,1000);
y = linspace(-L/2,L/2,1000);
[X,Y] = meshgrid(x,y);
Z = zeros(size(X));
Z(abs(X)<L/2 & abs(Y)<L/2) = 1;
surf(X,Y,Z,'EdgeColor','none','FaceColor','k');
axis equal;
axis([-L/2 L/2 -L/2 L/2 0 1]);
view(0,90);
title('Square Pinhole');