linux下使用video4Linx提供的API函数采集图像的源代码-video4Linx under linux using the API function to provide the source code of the image acquisition

通过linux的framebuffer层，封装简单的画点画线等基本API 函数，可供主函数调用-By the linux framebuffer layer packaging line stipple simple basic API functions, the main function calls available