大学生经常用手机拍摄PPT，但拍摄的PPT由于角度问题，大多有空间形变，也没有占满整个屏幕。本程序实现PPT自动定位矫正算法，通过连通域标定识别PPT的四个角，通过投影变换矫正PPT形状。我制作了GUI界面，运行“demo_gui.m”即可。此外提供了20张示例ppt，以便演示。详细信息以及算法的具体实现见压缩包内的“readme.pdf”-College students often use mobile phones to shoot PPT, but the shooting of the PPT due to the angle of the problem, most of the space deformation, but also does not account for the entire screen. This procedure to achieve automatic PPT positioning algorithm, through the connected domain calibration to identify the four corners of the PPT, through the projection transform to correct the shape of PPT. I made the GUI interface, running　demo_gui.m　can be. In addition, the 20 sample PPT is provided to demonstrate. Detailed information as well as the specific implementation of the algorithm see compression package within the readme.pdf