Animated portable network graphics (APNG) file processing method and device for digital television system

Abstract

The invention discloses an animated portable network graphics (APNG) file processing method and an APNG file processing system for a digital television system. The method provided by the invention comprises a front-end processing method and a terminal processing method. The front-end processing method comprises the following steps of: decoding an APNG file to obtain a red, green and blue (RGB) image frame and the transparent information of pixels of the RGB image frame; converting the RGB image frame into a luma and chroma (YUV) image frame; performing video coding on the YUV image frame according to a preset video coding standard to obtain video data; inserting the transparent information of the pixels of the RGB image frame into the video data obtained by the video coding; and transmitting the video data. The device provided by the invention comprises a front-end processing device and a terminal processing device. By the processing method and the processing device provided by the invention, the finite central processing unit (CPU) resources of a digital television set-top box are saved, the APNG file with a high frame rate and large images can be used, and dynamic images, with transparency effects, of the APNG file can be displayed at a terminal.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a method and device for processing APNG files in a digital television system. Background technique [0002] Along with the popularization of digital television use and the development of digital television technology, digital television users have put forward higher requirements to the picture effect of watching, for example, wish to see the hypertext markup language (Hyper Text Mark-up Language, HTML) page. HTML pages allow dynamic images in different data formats to be embedded. These dynamic images are not only vivid, but also the application of transparent background effects makes the dynamic effects colorful. Among various dynamic image formats, the Animated Portable Network Graphics (APNG) format, as an extension of the Portable Network Graphic Format (PNG) format, is a dynamic image format that is often embedded in HTML pages . [0003] At present, the usual ...

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Problems solved by technology

[0003] At present, the usual method for digital TV systems to process APNG files is to decode APNG files through the central processing unit (Central Processing Unit, CPU) of the set-top box. When the frame rate of the APNG file is high or the image size is large, the limited CPU resources of the set-top box cannot meet the real-time decoding of the image in the APNG file, and the animation effect may not be smooth when displayed, and the user will feel the picture when watching it. noticeable jumps and stops

Therefore, APNG files with high frame rate and large-size images are generally not supported in the existing digital TV HTML pages, or APNG files are displayed by reducing the frame rate and image size, but these solutions either cannot use APNG files , or reduce the quality of the APNG file image and the effect of the animation, so that the application and development of the APNG file dynamic image in the digital TV system is limited

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