Bus passenger counting based on frame difference and improved Hough transform

In order to improve the efficiency and accuracy of the bus passenger counting, an extracting method of moving object based on frame difference is proposed. This method can segment the moving area form the original image make use of the parallel projection and vertical projection of the subtraction between two adjacent frames. In this condition, a circles´ detection based on improved Hough transform is used to detect human´s heads and recognize body, in this way to improve operating rate and save memory overhead. The advantage of this method is easy to operate, high accuracy and is not affected by surroundings, weather and light.