Subtitle Image Processing Efficiency via Scan Line Extraction
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Solution Overview
Problem
Current subtitle processing methods waste processing cycles, bandwidth, and power by reading and writing entire subtitle images, even though only a small portion contains actual subtitle information, due to their larger size compared to the subtitle area.
Innovation Solution
Determining the size of the subtitle area within the subtitle image and generating a new subtitle image of the same size, which is then combined with the video image to form a composite image for display, reducing unnecessary memory reads and writes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire subtitle image is read and written to framebuffer, then the subtitle information is displayed, but processing cycles, bandwidth, and power are wasted due to the large size of the subtitle image compared to the actual subtitle area
Solution Approach 1:
The subtitle image is divided into multiple scan lines, and the system processes only the relevant scan lines that contain subtitle information. By segmenting the image processing into line-by-line operations and identifying the minimum and maximum line values that contain subtitles, the system avoids processing the entire large subtitle image, thus reducing power consumption and improving processing efficiency.
Solution Approach 2:
The system extracts only the necessary subtitle information from the large subtitle image by determining the bounding box defined by minimum and maximum line values. Instead of processing the entire subtitle image, the system extracts and processes only the relevant portion containing actual subtitle content, eliminating waste of processing cycles, bandwidth, and power on empty or irrelevant areas.
2Loss of information
If the entire subtitle image is processed, then complete subtitle information is displayed, but bandwidth is wasted due to unnecessary memory reads and writes
Solution Approach 1:
The system performs partial processing by reading and writing only the necessary scan lines containing subtitle information rather than the entire subtitle image. By determining the minimum and maximum line values that contain subtitles and processing only this range, the system achieves complete subtitle information display while minimizing bandwidth consumption through selective memory access.
3Ease of operation
If the entire subtitle image is written to framebuffer, then the subtitle is displayed, but processing cycles are wasted due to the size mismatch between subtitle image and subtitle area
Solution Approach 1:
The system performs preliminary analysis to determine the minimum and maximum line values that contain subtitle information before writing to the framebuffer. By pre-calculating the relevant scan line range and then selectively writing only those lines, the system simplifies the overall process while significantly reducing processing time compared to writing the entire subtitle image.
Data Source
AI summary
Various embodiments are generally directed an apparatus and method for determining a size of a subtitle area in a subtitle image comprising subtitle information, creating a new subtitle image comprising the subtitle information, the new subtitle image having a same size as the size of the subtitle area and is smaller than the subtitle image and combining the new subtitle image with a video image for presenting the subtitle information.