4/18/2023 0 Comments Opencv python qr code reader![]() ![]() We can filter out those patches with low gradient coherence, the white boxes mean patches with high gradient coherence in Figure 3.įor example, in one iteration the decoder is EAN-13 format. We divide the image into patches by preset scale and then compute the directional coherence one by one. Then we use the Scharr operator to calculate the gradients in the x and y directions respectively. Pre-processingįirst, we need to convert the image to gray-scale and scale it to a preset size. We will describe the details of this algorithm. Then the precise barcode area can be found according to other barcode features. It can be used to detect areas that may contain a barcode and eliminate most background. In the following, we mainly introduce the principle of localization and decoding algorithm.ĭirectional coherence of the barcode is the most distinctive feature in a barcode image under a complex background. First, we locate the barcode in the image, then crop and binarize the ROI, and finally decode the ROI. Shown in Figure 2 is our algorithm, organized in discrete three steps. For convenience, we’re going to use EAN-13 as an example in the following. Most of the common goods in life use the EAN-13 barcode. The EAN-13 barcode is based on the UPC-A standard, which was first implemented in Europe by the International Item Coding Association and later gradually spread worldwide. Currently our code supports EAN-13, EAN-8 and UPC-A encoding methods. The content of the barcode can be decoded by matching with various barcode encoding methods. ![]() This data is the code information of the barcode. Barcode recognition is the process of scanning the barcode in the horizontal direction to get a string of binary codes composed of bars of different widths and colors. ![]() A common barcode is a pattern of parallel lines arranged by black bars and white bars with vastly different reflectivity and contrast. Their main research interest is computer visionīarcodes are a major technique to identify commodities in real life. Junhao Liang and Tianqi Wang are undergraduates at Southern University of Science and Technology in Shenzhen. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |