基于cortexA9开发板的图像采集与梯度幅度求取代码，已调试，好用。-Image acquisition and gradient amplitude based on cortexA9 development board code sequence, have been debug, easy to use.

Based on the original gradient slide, but with perspective applied to the gradient shaders local matrices. -Based on the original gradient slide, but with perspective applied to the gradient shaders local matrices.