Method for improving certificate recognition accuracy based on mask and related device
A technology for recognition accuracy and documents, applied in the field of image recognition, can solve the problem of inability to accurately recognize characters with similar shapes, and achieve the effect of improving the accuracy.
Pending Publication Date: 2021-02-05
PING AN TECH (SHENZHEN) CO LTD
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[0003] Based on this, the present invention provides a method and a related device for improving the accuracy of document recognition based on a mask, so as to solve the problem that the existing OCR recognition technology cannot accurately recognize characters with similar shapes in some scenarios
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[0055] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.
[0056] The terms "first", "second", and "third" in this application are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first", "second", and "third" may explicitly or implicitly include at least one of these features. In the description of the present application, "plurality" means at least t...
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The invention discloses a method for improving certificate recognition accuracy based on mask and a related device. The method comprises the steps of inputting a to-be-recognized text image into a trained certificate text recognition model, and obtaining logarithm probability logits value distribution vectors corresponding to each column of image features of the to-be-recognized text image; obtaining a character set corresponding to the text image to be recognized, wherein the character set comprises a plurality of target characters, and mask processing being conducted on the logarithm probability logits values corresponding to the non-target characters in the logarithm probability logits value distribution vector. The method comprises the steps that a mask is processed, then a softmax function is used for converting the mask, a character category probability distribution vector is obtained, and the character category probability obtained after conversion of the softmax function is conducted on a logits value processed through the mask approaches 0; and finally, text information of the to-be-identified text image is determined based on the probability distribution vector of each character category. By means of the mode, it is avoided that non-target characters which cannot be involved in the to-be-recognized text are recognized, and the recognition precision of the certificatetext recognition model can be remarkably improved.
Description
technical field [0001] The invention relates to the technical field of image recognition, in particular to a method and a related device for improving the accuracy of certificate recognition based on a mask. Background technique [0002] In the project of using OCR (Optical Character Recognition) technology to identify overseas ID cards, due to data security issues, the samples of overseas ID cards that can be used for training are very limited, and cannot fully cover the identification of overseas ID cards in real scenarios. In order to solve this problem, the existing technology uses sample enhancement technology for supplementary training. Compared with real samples, the samples generated by data enhancement technology are too clear and the image signal quality is too good, so that the robustness of the model cannot be effectively improved. As a result, in some scenarios, such as blur or light spots, the model cannot accurately distinguish the capital letter O from the nu...
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Login to View More IPC IPC(8): G06K9/34G06K9/46G06N3/04G06N3/08
CPCG06N3/049G06N3/08G06V30/153G06V10/462G06N3/045
Inventor 张懿姜禹张国辉宋晨
Owner PING AN TECH (SHENZHEN) CO LTD