Picture Display System Signal Type Identification
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing picture display systems fail to adequately distinguish between S-HD and original HD digital television signals, leading to inadequate adjustment of picture quality, particularly in cases where aspect ratio information is missing or side panels are not easily detectable.
Innovation Solution
A picture display system that uses a combination of cross-color elimination, EPG information, and frequency band detection to determine the type of HD signal, applying specific color and contour corrections based on flag signals to adjust image quality accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If side panel detection method is used to distinguish S-HD and original HD signals, then signal type identification can be achieved, but the method fails when side panels are not black or contain picture images, leading to incorrect identification
Solution Approach 1:
The patent employs multiple detection methods (aspect ratio detection, side panel detection, and cross-color element detection) that can function across different signal formats and conditions. Each method serves as a backup or supplement to the others, ensuring universal applicability whether the signal has black side panels, colored side panels, or no side panels at all.
Solution Approach 2:
The patent introduces cross-color element detection as an intermediary method to bridge the gap when traditional side panel detection fails. By detecting cross-color elements in specific frequency bands, the system can indirectly identify S-HD signals even when side panels are not visually distinct, serving as a mediator between the detection need and the signal characteristics.
2Ease of operation
If aspect ratio information is used to distinguish signal types, then identification can be performed, but this information is often not added to the digital TV signal, causing identification failure
Solution Approach 1:
The patent enables the system to self-identify signal types by analyzing intrinsic signal characteristics rather than relying on externally added information. By detecting cross-color elements and aspect ratios directly from the signal content, the system performs self-service identification that does not require additional metadata or information to be added to the signal.
Solution Approach 2:
The patent replaces the mechanical/info-based approach of reading aspect ratio metadata with a signal-processing-based approach. Instead of simply reading added information, the system uses cross-color element detection and frequency band analysis to infer signal type, substituting a more robust detection mechanism for the weaker information-based method.
3Manufacturing precision
If only sharpness correction is applied to HD signals, then contour quality improves, but color reproduction remains inadequate for different HD signal types
Solution Approach 1:
The patent applies different color correction characteristics specifically tailored to S-HD signals versus original HD signals. By identifying the signal type first, the system can apply localized quality adjustments appropriate for each type: S-HD signals receive color corrections adapted to their narrower color gamut, while original HD signals receive corrections suited to their wider color reproduction capabilities.
Solution Approach 2:
The patent makes the color correction characteristics dynamic rather than fixed. The correction parameters change based on the detected signal type, allowing the system to adapt its color reproduction strategy in real-time according to whether it is processing an S-HD or original HD signal, thereby achieving versatile color correction across different signal formats.
Data Source
AI summary
A picture display technique carries out an adjustment of image quality of an inputted picture signal in response to a type of the inputted picture signal, e.g., a type of a first picture signal into which a second picture signal, having fewer scanning lines than that of the first picture signal, is converted, and an original type of the first picture signal, and then displays a picture of an adjusted picture signal on a display device. Further, the adjustment of the picture quality may include at least one of hue correction of the inputted picture signal in a certain hue range and chroma correction of the inputted picture signal in a certain chroma range. The adjustment of the picture quality may also include a contour correction of the inputted picture signal.