This code draw a red rectangle aroud the face

基于hough算子的矩形检测,,可用于车牌识别，pcb检测等等。 -The hough operator rectangle detection, license plate recognition, pcb testing, etc., can be used.

矩形检测完整程序,可以检测出图片中的所有矩形图案。-rectangle detection

For the detection of sign each frame is analysed. First the image is Converted into gray scale image and then threshold is performed. Then by using blob analysis portion of red part is extracted. Then this extracted part is compared with each t