Method for rendering subtitling based on curved profile closed loop domain and pixel mask matrix

Abstract

The invention relates to a caption rendering technology in a field of producing television programs, in particular to a caption rendering method based on a curve-profiled closed loop domain and a pixel mask code matrix. The method is that: after a Bezier curve vector profile of a caption object is discretized into a polygon vector, according to the direction and embordering type of a polygon, the polygon vector used for embordering is further created, thus systematically combining the computer graphics with the digital image processing, converting the vector information of the caption object into the pixel mask code matrix based on a contour line and applying the pixel mask code matrix throughout all links of the caption rendering; therefore, the effect of the caption rendering is improved, the ever-increasing demands of the caption quality and the caption effect from the television programs producing and broadcasting organizations are sufficed, the important social property of serving the mass people by television media is reflected even more directly, and better social benefits are obtained.

Description

technical field [0001] The invention relates to a subtitle rendering technology in the field of television program production, in particular to a subtitle rendering method based on a curved contour closed loop and a pixel mask matrix. Background technique [0002] TV subtitle is a kind of visual language, it transmits information in the form of text and graphic symbols, and it is the reinforcement and supplement of the content expressed by sound and image. In TV programs, a medium that includes the art of sound and picture, subtitles have been regarded as the "second commentary" that is as important as voice-over and commentary. TV subtitles enrich the visual perception. Compared with the pictures, they convey the information that the audience needs to understand more intuitively. Through the perfect combination of subtitles and images, the visibility of TV programs can be greatly improved. According to the needs of color, content, rhythm and atmosphere of the picture, cho...

AI Technical Summary

Problems solved by technology

This problem has brought many disadvantages to the subtitle system in both implementation and application

From an implementation point of view, this will lead to multiple completely different rendering engines and rendering processes in a subtitle system, and if you want to support a new subtitle object, you may have to define and implement a new rendering engine, resulting in subtitles There are great limitations in the functional scalability of the system; from the application point of view, it brings two fatal problems: on the one hand, different types of subtitle objects will eventually display inconsistent effects, for example, two different types of subtitle objects have the same It is a full edge with two pixels added, but due to different rendering engines, the final processing results may be different, which brings a lot of inconvenience to users when creating subtitles; on the other hand, in the subtitle system for The operation of subtitle objects has to be subject to specific restrictions. For example, some subtitle objects support geometric rotation and geometric scaling, while others do not. Some subtitle objects support adding edges and shadows at any angle, while others only support fixed Adding edges and shadows to angles, some don’t even support it

This will lead to two problems. On the one hand, since the final processing result requires an integer pixel value, rounding operations will be performed at different stages of the rendering engine algorithm, which will cause cumulative errors in calculation, resulting in the final The subtitle effect has defects in local details, such as blurred text with many strokes, sticky strokes, etc.; on the other hand, these floating-point operations are mathematical operations that take up a lot of machine instructions, which greatly reduces the performance of the entire subtitle system. Work efficiency affects the timeliness of subtitle production and broadcasting

[0010] Third, the effect of edge anti-aliasing, which is one of the important indicators of subtitle rendering, is not ideal, and cannot even reach a practical level.

This is because the existing subtitle system completely relies on the image processing method of the current pixel space when performing anti-aliasing processing. Without the participation of subtitle geometric vector information, sub-pixel-based processing cannot be realized.

This makes the final rendering effect of the existing subtitle system have a relatively obvious edge aliasing effect, which affects the effect of the subtitle display

[0011] Fourth, for the same reason as above, when the image processing of the subtitle object based on the FilterPipe (Fil

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