DC系数在目标检测中的应用

针对基于单片机的无线图像监控系统存在的处理能力差、存储空间有限的缺点，提出了一种基于DC系数的目标检测方法：先对JPEG图像进行部分解码，提取亮度信号的DC系数，得到DC图，然后对相邻两幅DC图进行相减操作，最后对差值DC系数进行分块和阈值处理，判断是否有目标出现并报警。实验结果表明，该方法具有计算复杂度低，占用存储空间少和误报率低的特点，非常适合基于单片机的无线图像监控系统。

Application of object detection method based on DC coefficients

To solve the problems in wireless monitor system based on single chip，such as poor CPU capability and small memory capacity，this paper proposes an object detection method based on DC coefficient.The method consists of three step：Firstly， decode the JPEG image partially and obtain the DC coefficients of the luminous blocks，then subtract the DC coefficients of the neighbouring image and implement threshold controlling on the subtract result to decect the object.Experimental results show this method has low computational complexity and high alarming precision，and it is suitable for wireless monitor system based on single chip.