输入：
detect_point: 1024*2 double
绘制：
scatter(detect_point(:,1),detect_point(:,2))
结果：
举例：
% 梯形
pointNumber = 32
detect_point = []
for im=1:10:10.*pointNumber
for in=1:10:10.*pointNumber
in = in + 0.1*(im/32-1)*(16-in/10);
im = im + -0.0005*in;
% scene(im,in,1) = 10;
detect_point = [detect_point;[im,in]];
end
end
scatter(detect_point(:,1),detect_point(:,2))
