中文说明：应用背景人脸检测是一个复杂的具有挑战性的模式检测问题，其主要的难点有两方面，一方面是由于人脸内在的变化所引起：（1）人脸具有相当复杂的细节变化，不同的外貌如脸形、肤色等，不同的表情如眼、嘴的开与闭等；（2）人脸的遮挡，如眼镜、头发和头部饰物以及其他外部物体等；另外一方面由于外在条件变化所引起：（1）由于成像角度的不同造成人脸的多姿态，如平面内旋转、深度旋转以及上下旋转，其中深度旋转影响较大；（2）光照的影响，如图像中的亮度、对比度的变化和阴影等。（3）图像的成像条件，如摄像设备的焦距、成像距离，图像获得的途径等等。关键技术有三个层面:首先,根据连续量化转换特性提出了光照在物体识别和传感器的敏感操作。 请点击左侧文件开始预览 ！预览只提供20%的代码片段，完整代码需下载后查看 加载中 侵权举报
English Description：
Application backgroundFace detection is a complex and challenging questions of pattern detection, the main difficulty has two aspects, one is the inner face due to changes caused by: (1) face details are quite complex change, different appearance such as face, skin color, different form the situation such as opening and closing eyes etc., mouth; (2) face mask, such as glasses, hair and head ornaments and other external objects; on the other hand, due to the external condition changes caused by: (1) due to the different imaging angle caused by the multi pose face, such as plane rotation, rotation and rotation on the depth, the larger the depth of rotation effect; (2) the effect of illumination, such as brightness, contrast in the image changes and shadow etc.. (3) imaging conditions, such as the focal length of the camera, the distance of the image, the way of the image, and so on.Key TechnologyThere are three aspects: first, according to the c