完整的基于Opencv摄像机标定程序，包括：图片的加载； 角点的检测 提取角点精确坐标；参数求解 利用参数对图像进行矫正；-Based on the complete Opencv camera calibration procedures, including: image loading corner detection. Corner extraction precision coordinate solving parameters for image correct

把倾斜的ppt等平面文件通过透视变换只懂转为正面。(Tilt the PPT flat file into perspective only by perspective transformation.)