Aiming at this problem, histogram equalization and gray stretch are used to enhance license plate image, and make the image clearer. 针对这一情况,将直方图均衡和灰度拉伸相结合,增强牌照图像,使图像更加清晰。
Because of using large plate to detect corner, this method is good for noise filtering and can be popularized to gray images by using two kinds of large plate. 由于先用较大圆盘做初步检测,可以降低噪声干扰。利用两种新的大圆盘,此方法可推广到灰度图像的拐点检测。
The application of the artificial intelligence technique in the properties forecast of gray irons, the progress of the development of laser surface strengthening, semisolid diecast plate casting and some other compounding technique will certainly revolution in the field of the study and production of gray cast iron. 人工智能技术在灰铸铁性能预测中的应用、铸铁件表面激光强化和半固态压铸板状灰铸铁件的开发等复合化技术的进展必将带动铸铁研究和生产领域产生某些根本性的变革。
According to the method, whether the plate needs reverse color is judged by calculating the average gray level of the license plate gray image as well as the number of pixels whose gray level is higher than the average. 该方法通过计算车牌灰度图像灰度平均值和大于灰度平均值的像素数,来判断车牌是否需要进行反色处理。
License plate segmentation using color image can eliminate the effect of shadow more effectively than that using gray image, and color is also a parameter for License plate recognition. 基于彩色图像车牌分割与采用灰度图像车牌分割相比,可以有效消除阴影影响,同时车牌颜色也是车牌识别的一个参数。
Based upon the combination of texture analysis and gray scale vertical projection, a license plate segmentation algorithms is proposed. 根据车牌区域字符的纹理特征和统计规律,提出了一种综合纹理分析和垂直投影的车牌定位方法。
First, we standardized the size, variance of gray scale and mean value of gray scale of the motor vehicle plate images. 首先,对机动车号牌图像进行大小、灰度方差、灰度均值的标准化处理。
Using a character segmentation method based on gray additive to segment the vehicle license plate character, and the experiment result shows that this method has a better character segmentation effect to the license plate image with poor quality. 采用了一种基于灰度累加的车牌字符分割方法对车牌字符进行分割,证明对图像质量较差的车牌字符也能有较好的分割效果。
Searching for the features of the object is designed based on the features of gray arrangement. The plate is located rough by the color feature and the plate information according to the geometry feature of the plates. 本文从车牌几何形状的特征出发,设计出一种首先基于颜色特征和车牌的先验知识对车牌进行粗定位,然后根据车牌边界的特点寻找目标对象特征点,对车牌进行精确定位。
First, candidate regions of license plate are extracted from, the gray image, and then the license plate location is chose in these candidate regions based on edge-color pairs of HIS color space. 该方法的流程是:先在车牌灰度图像的基础上提取候选区域,然后对候选区域边缘点进行HIS空间边缘颜色对判断。
When analyzing gray image formed by stock data of the plate, noise will affect the clarity of the image. 在分析由股票板块数据形成的灰度图时,噪声将影响图像的清晰度。