说明：  完整的视频车辆检测的原理是首先通过图像采集系统采集视频图像，数字化，存入内存或帧缓存中；对数字图像进行预处理(滤波除噪、图像锐化、对比度增强)，从而减小噪声对图像质量的影响。
(The principle of complete video vehicle detection is to collect video images from the image acquisition system first, digitize, save the memory or frame cache, and preprocess the digital image (filter denoising, image sharpening, contrast enhancement) to reduce the noise to image quality.)