Image Processing Method for Interlaced Frames with Running Captions
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Solution Overview
Problem
Conventional image processing methods for images with running captions result in deteriorated frame definition and the occurrence of saw-tooth phenomena at intersections, as they directly add captions to interlaced frames without suitable processing.
Innovation Solution
An image processing method that separates received frames into at least two areas based on an area selection signal, allowing for different image processes to be performed on each area, such as inverse telecine or motion adaptive processing, to maintain high definition and improve caption clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If running captions are directly added to interlaced frames without separation, then the processing is simple and fast, but the frame definition deteriorates and saw-tooth phenomena occur at intersections
Solution Approach 1:
The patent divides the interlaced frame into two separate areas: an image area and a caption area. This segmentation allows different processing methods to be applied to each area independently. The image area undergoes inverse telecine processing to reconstruct complete frames, while the caption area is processed separately to avoid the saw-tooth phenomena that occur when captions are directly added to interlaced frames.
Solution Approach 2:
The patent applies different processing qualities and methods to different parts of the frame. The image area receives high-quality inverse telecine processing to restore complete frame definitions, while the caption area receives specialized processing optimized for text display. This local differentiation ensures that each area is processed in the most appropriate manner, preventing the degradation of frame definition while maintaining processing efficiency.
2Manufacturing precision
If inverse telecine process is applied to interlaced frames with running captions, then complete frames can be reconstructed, but the running captions become unclear and mixed with image data
Solution Approach 1:
The patent segments the frame into image and caption areas before processing. By applying inverse telecine only to the image area and processing the caption area separately, the complete frame reconstruction does not interfere with caption clarity. The caption area is handled independently to preserve text information while the image area receives the full benefit of inverse telecine processing.
Solution Approach 2:
The patent extracts the caption area from the interlaced frame structure and processes it separately from the image area. This extraction prevents the caption data from being mixed with the image reconstruction process, ensuring that running captions remain clear and distinguishable while the image area undergoes complete frame reconstruction through inverse telecine.
3Adaptability or versatility
If 2:2 pull down or 3:2 pull down is used to convert film frames to interlaced broadcast format, then the broadcasting standard is met, but the original frame definition is lost and cannot be recovered
Solution Approach 1:
The patent performs inverse telecine processing on the image area to reconstruct complete frames from the interlaced structure. By detecting the pull-down pattern (2:2 or 3:2) and applying the appropriate inverse process, the system recovers the original frame definitions before final playback. This preliminary reconstruction ensures that the original frame definition is restored while maintaining broadcasting compatibility.
Solution Approach 2:
The patent employs frame detection mechanisms to identify whether 2:2 pull down or 3:2 pull down was applied to the original film frames. Based on this feedback information, the appropriate inverse telecine process is selected to reconstruct the complete frames. This feedback-driven approach ensures accurate recovery of original frame definitions while maintaining compatibility with broadcast standards.
4Adaptability or versatility
If conventional frame converting format is used to achieve 60 Hz or 50 Hz broadcast standard, then the broadcasting frequency requirement is met, but saw-tooth phenomena occur at frame intersections
Solution Approach 1:
The patent segments the frame processing into image area and caption area, applying different processing strategies to each. The image area undergoes inverse telecine processing that properly handles frame reconstruction to eliminate saw-tooth phenomena, while the caption area is processed separately to maintain text clarity. This segmentation resolves the conflict between meeting broadcast frequency requirements and maintaining image smoothness.
Data Source
AI summary
An image processing method and device thereof are provided. The device includes a capture device and a processor. The capture device is adopted for receiving a plurality of frames and comparing at least two adjacent frames to obtain an area selection signal according to a differential value there-between. The processor is connected to the capture device for receiving the area selection signal and to separate each of the adjacent frames into at least two areas. Each of the areas of the adjacent frames is performed by an image processing step respectively, and then the images of the areas are combined to obtain a resulted frame.