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来源：百度知道 编辑：UC知道 时间：2024/06/18 15:32:40
然后，对PDF417条形码的识别和解码过程进行详细的分析与研究。传统的条码识别的方法多采用基于条码图像的边缘的方法和基于单位码字模块的方法，这两方法分别对条码的质量和采集设备的精度有较高要求，而当条码的边缘被破坏或者图像存在畸变时则很难得到正确的条码信息。通常人们的解决办法是使用RS错误控制码来对错误信息进行纠正，但是这样的处理方法也存在着很大的不足。所以在研究前人工作的基础上，采用了一种新的算法来避免对错误控制码过多的依赖。本文首先对条码图像进行边缘提取、判断有效边缘，然后通过条码边缘的位置计算条码单位模块的宽度。再计算出条码的单位模块宽度以后以它为基础在原始的条码图像中找出条码中所有的条起始点和空起始点，从而定位出条码图像所有的符号字符。
On the acquisition of the PDF417 barcode to image pre-processing. The general flow of the barcode image filtering, binarization and image angle correction. Because of the use of our cameras capture the barcode images, barcode image, therefore the edge of a very vague, and there is a certain degree of distortion, the value of the use of two common methods of treatment on the effectiveness and efficiency should not meet the requirement, in contrast to the ordinary in this article Global threshold method and the Otsu method, the use of an improved overall approach to the threshold of the bar code image segmentation, not only can be achieved relatively good results, and real-time algorithm can guarantee that.
And, on the PDF417 bar code recognition and decoding process of a detailed analysis and research. The traditional method of bar code identification of many of the images based on the edge of bar code and code modules based on the unit method, the two methods separately for ba