Text enhancement method and device, text extraction method and device

Abstract

The embodiment of the invention discloses a text enhancement method, a text enhancement device, a text extraction method and a text extraction device. The text enhancement method comprises the following steps: acquiring an original image including a line of text; according to the direct difference degree and indirect difference degree between any original pixel in the original image and each neighborhood pixel in a neighborhood set of the original image, carrying out stroke two-dimensional filtering on the original brightness value or / and color value of each original pixel so as to obtain an updated brightness value or / and color value of the filtered original image, wherein the range of the neighborhood set is a square with a side length of w and the original pixel as a center, and w is less than the height of the original image; and respectively replacing corresponding original brightness value or / and color value with the updated brightness value or / and color value after filtering so as to generate a text enhancement image corresponding to the original image. Through the embodiment of the invention, texts in original images can be enhanced, so that the subsequent text extraction on the text enhancement image is more precise and accurate.

Description

technical field [0001] The present invention generally relates to the technical field of image processing, and in particular, to a text enhancement method and device, and a text extraction method and device. Background technique [0002] In the process of playing a video, or when viewing an image, the video or image often contains text descriptions, for example, the description of the time and place of a video, or the description of the image, etc. Since these text contents are closely related to videos or images, extracting text from videos or images becomes a crucial technology. [0003] The text extraction method for video or image in the prior art can be based on binarization, edge color clustering and detection technology to extract text in image or video. [0004] However, during text extraction in the prior art, due to excessive noise in the video or image, the image or video may be blurred, and even if there is a change in lighting in a video, the border between the...

AI Technical Summary

Problems solved by technology

[0004] However, when the prior art extracts text, there may be too much noise in the video or image, the image or video is blurred, and even if there is a lighting change in a video, the boundary between the text and the background in the image or video will be blurred , or the text content itself is not clear enough, which affects the effect of text extraction

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