Method for video enhancement and apparatus thereof

Abstract

The invention provides a method and a device used for video enhancement. The method comprises the steps as follows: a nonlinear tensioning curve mapping table is arranged; for each frame of image, the histogram balance mapping table of the frame of image is calculated according to the brightness data; subsequently, the mapping value of at least each brightness value of a brightness value set of the pixel point of the frame of image in the nonlinear tensioning curve mapping table and the histogram balance mapping table is weighted and averaged; furthermore, a brightness mapping table is used for recording the corresponding relationship between each brightness value and the mapping value after weighted-average; subsequently, according to the brightness mapping table, the brightness value of the pixel point of the frame of image is updated as the mapping value after weighted average corresponding to the brightness value. The device of the invention comprises a brightness enhancement module which further comprises a nonlinear curve tensioning table memory unit, a histogram balance mapping table calculation unit, a brightness mapping table calculation unit and an image brightness enhancement mapping unit. The method and the device of the invention can improve the visible effect of the video images under the condition of low illumination and normal illumination.

Description

technical field [0001] The invention belongs to the field of multimedia information transmission and processing, and in particular relates to a video enhancement method and device thereof. Background technique [0002] Video enhancement is a basic means of pre- and post-processing of video. In general, due to the limitation of mobile terminal cost and energy consumption, videos that can be played normally in theaters or TVs will have two shortcoming: [0003] 1) Videos in dark night or dim scenes will be displayed darker on the mobile phone, so that the picture cannot be seen clearly in normal or too bright indoor and outdoor environments; [0004] 2) Videos under normal lighting conditions can display details in theaters or TVs very well, but when displayed on mobile phones, due to the limitations of screen resolution and color resolution, the scene will be somewhat blurred and some details will be lost, especially It is a compressed and decompressed video, and this pheno...

AI Technical Summary

Problems solved by technology

[0003] 1) Videos in dark night or dim scenes will be displayed darker on the mobile phone, so that the picture cannot be seen clearly in normal or too bright indoor and outdoor environments;

[0004] 2) Videos under normal lighting conditions can display fine details in theaters or TVs, but when displayed on mobile phones, due to the limitations of screen resolution and color resolution, the scene will be somewhat blurred and some details will be lost, especially It is a compressed and decompressed video, and this phenomenon will be more serious;

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