I?=?imread（‘timg.jpg‘）;
[height?width?depth]?=?size（I）;
A?=?I;
centerX?=?width?/?2;
centerY?=?height?/?2;
%?alpha?=?pi?/?4;
f?=?width?/?（2?*?tan（pi/4/2））;
for?i?=?1?:?width
	for?j?=?1?:?height
		theta?=?asin（（i?-?centerX）?/?f）;
		pointX?=?int32（f?*?tan（（i?-?centerX）?/?f）?+?centerX）;
		point