Certificate picture definition evaluation method

Abstract

The invention discloses a certificate picture definition evaluation method. The certificate picture definition evaluation method comprises the steps: obtaining an original certificate picture; carrying out bilateral filtering processing on the original certificate picture to obtain a grey-scale map of the certificate picture; performing gradient-based edge detection on the grayscale image, so thata gradient image can be obtained; obtaining an implicit gradient function according to the measurement pixel surrounding gray scale change matrix, and analyzing the continuous change condition of thesurrounding gray scale of each pixel in the gradient map based on the implicit gradient function; taking a global average value of an analysis result as an evaluation value of the picture definition;and standardizing the evaluation value to obtain a picture definition score. According to the invention, the definition of the character area of the license picture can be effectively evaluated; thedefinition of the certificate picture can be directly and effectively judged, and text information extraction does not need to be carried out on the fuzzy certificate picture, and the efficiency of the whole system is greatly improved especially in a streaming processing environment; and the evaluation effect is good, and the calculated amount is low, and a large amount of time and operation costare saved.

Description

technical field [0001] The invention belongs to the technical field of picture processing, in particular to a method for evaluating the clarity of a license picture. Background technique [0002] The catering stores on the online catering platform not only have physical stores, but also franchise stores of online food delivery platforms such as Ele.me and Meituan, which are engaged in food delivery business. According to the relevant provisions of the State Administration for Industry and Commerce's "Online Transaction Management Measures" and the State Food and Drug Administration's "Online Catering Service Food Safety Supervision and Administration Measures", online catering service providers should publicize their business licenses, food Business license and other information. [0003] One of the supervisions for online platform merchants is whether the uploading of certificates is compliant, and there are potential risks for merchants who upload vague certificates. The...

AI Technical Summary

Problems solved by technology

The license picture contains a lot of text areas, and the existing methods cannot effectively evaluate the clarity of the text areas in the license picture, and the evaluation effect is poor

Putting all the license pictures into the text extraction system first and then judging the clarity will greatly increase the amount of calculation, and the time cost is high, so we need to judge the clarity of the license pictures before extracting the text information of the license pictures

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