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US 2021/0201041 A1Published application
Logo extraction device, and brightness adjusting method and device for logo
AssigneeTcl China Star Optoelectronics Technology Co., Ltd.
InventorsYang RAO, Leli PENG
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Abstract
The present application discloses a logo extraction device, and a brightness adjusting method and device for a logo. The logo extraction device includes an acquiring module, a gray-scale converting module, a weight processing module, and an extraction module. In the present application, by increasing a number of key frames in a process of logo extraction and using video frame weighting, the logo is extracted and thereby accuracy of logo extraction is improved.
Claims10
A logo extraction device, comprising:
- an acquiring module configured to acquire a continuous video image of preset frames during video playback and to acquire RGB values of pixels in each frame of the video image;
- a gray-scale converting module configured to convert the RGB values into a V-channel model and to obtain corresponding gray-scale values, thereby determining a gray-scale image corresponding to each frame of the video image according to the gray-scale values of the pixels;
- a weight processing module configured to perform weight calculation on the gray-scale values of the pixels in the gray-scale image of each frame of the video image and a gray-scale image of a previous frame of the video image, thereby performing weighting process to the gray-scale values of the pixels in each gray-scale image based on a weight value;
- and
- an extraction module configured to determine feature point information whose gray-scale value is less than a threshold value from the gray-scale image of the video image in the preset frames according to a preset algorithm, thereby using the feature point information to extract a logo from the video.
2 more elements
A brightness adjusting device for a logo, comprising:
- a logo extraction unit configured to acquire a continuous video image of preset frames during video playback and to extract the logo from the video image of the preset frames;
- a calculating unit configured to calculate a mean value of gray-scales of pixels in an area where the logo is located and a mean value of gray-scales of pixels of the video image, respectively;
- and
- a brightness adjusting unit configured to adjust a brightness of the logo by using a first algorithm based on the mean value of the gray-scales of the pixels in the area where the logo is located and the mean value of the gray-scales of the pixels of the video image.
1 more element
A brightness adjusting method for a logo, comprising following steps:
- acquiring a continuous video image of preset frames and RGB values of pixels in each frame of the video image by an acquiring module during video playback;
- converting the RGB values into a V-channel model by a gray-scale converting module, obtaining corresponding gray-scale values, thereby determining a gray-scale image corresponding to each frame of the video image according to the gray-scale values of the pixels;
- performing weight calculation on the gray-scale values of the pixels in the gray-scale image of each frame of the video image and the gray-scale image of the previous frame of the video image, thereby performing weighting process to the gray-scale values of the pixels in each gray-scale image based on a weight value;
- determining feature point information whose gray-scale value is less than a threshold value from the gray-scale image of the video image in the preset frames according to a preset algorithm by an extraction module, thereby using the feature point information to extract the logo from the video;
- calculating a mean value of gray-scales of pixels in an area where the logo is located and a mean value of gray-scales of pixels of the video image by a calculating unit, respectively;
- and
- adjusting a brightness of the logo by using a first algorithm by a brightness adjusting unit based on the mean value of the gray-scales of the pixels in the area where the logo is located and the mean value of the gray-scales of the pixels of the video image.
4 more elements
Dependencies are inferred from the claim text.