Subtitle Bitmap Data Superimposition Using Field Segmentation
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Solution Overview
Problem
Existing technologies face challenges in effectively superimposing subtitle bitmap data onto video data during transmission, particularly in broadcasting, where subtitle management and synchronization with video data are not efficiently handled.
Innovation Solution
A transmission device and method that generates progressive video and subtitle streams, with the subtitle encoding unit producing progressive subtitle bitmap data, and a transmission unit transmitting these streams in a container format, allowing for efficient superimposition on the reception side. This includes the use of identification information for coordinate and resolution transforms to align subtitle data with video data of higher resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional subtitle data transmission is used, then subtitle data can be transmitted, but the subtitle bitmap data cannot be favorably superimposed onto video data on the reception side
Solution Approach 1:
The subtitle bitmap data is divided into top-field and bottom-field data blocks, with each block containing data for a specific field. This segmentation allows the reception device to process and superimpose subtitles field-by-field, improving superimposition accuracy by ensuring that subtitles are correctly positioned on the corresponding video fields without requiring complex full-frame processing
Solution Approach 2:
The transmission device performs preliminary organization of subtitle bitmap data into top-field and bottom-field data blocks before transmission. This preliminary action prepares the data in advance for field-based superimposition, allowing the reception device to directly use the segmented data for accurate subtitle placement without requiring complex real-time processing
2Manufacturing precision
If progressive subtitle bitmap data is transmitted, then favorable superimposition is achieved, but data structure and transmission format complexity increases
Solution Approach 1:
The progressive subtitle bitmap data is segmented into top-field and bottom-field data blocks, with each block containing a field identifier and corresponding subtitle bitmap data. This segmentation enables the reception device to process each field independently and superimpose subtitles accurately on the corresponding video fields, achieving precise positioning without requiring complex full-frame processing algorithms
Solution Approach 2:
The transmission device performs preliminary organization of progressive subtitle bitmap data into field-specific data blocks with embedded field identifiers before transmission. This preliminary action prepares the data in advance for field-based superimposition, allowing the reception device to directly use the segmented data for accurate subtitle placement on progressive video without requiring complex real-time field separation processing
Data Source
AI summary
To allow subtitle bitmap data to be favorably superimposed onto video data on the reception side.A video stream having progressive video data is generated. A subtitle stream having progressive subtitle bitmap data is generated. A container including the video stream and the subtitle stream, in a predetermined format is transmitted. For example, the progressive subtitle bitmap data divided into top-field subtitle bitmap data and bottom-field subtitle bitmap data or not divided is present in the subtitle stream.