Video Quality Test Signal Insertion for Digital TV Assessment
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Solution Overview
Problem
Existing digital TV systems face challenges in objectively assessing video quality in real-time during broadcasting, especially without transmitting source video or characteristic information, and current methods are complex and costly, with subjective assessments being influenced by various factors.
Innovation Solution
A video quality assessment system that inserts a test signal into the transient effect area of each frame of the source video, using a test signal generation and insertion device, and a measurement device to detect and analyze the test signal in both time and frequency domains, allowing for objective quality measurement without disrupting existing broadcasts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a test signal is inserted into the source video for quality assessment, then objective video quality measurement becomes possible, but the broadcasting system complexity increases
Solution Approach 1:
The patent introduces a test signal as an intermediary element that is inserted into the source video and later detected at the receiver end. This test signal acts as a mediator that carries quality assessment information without requiring complex communication between transmitter and receiver, thereby enabling objective measurement while keeping the broadcasting system relatively simple
Solution Approach 2:
The broadcasting system performs self-assessment by embedding a test signal in the transmitted video and automatically detecting it at the receiver. This self-service mechanism eliminates the need for external complex assessment systems, allowing the system to measure its own video quality independently
2Measurement precision
If separate channels are used to transmit reference signals for quality assessment, then quality measurement can be performed, but real-time assessment during broadcasting becomes difficult
Solution Approach 1:
The patent merges the quality assessment function with the normal video transmission by inserting the test signal directly into the source video stream. This combining approach allows the same transmission channel to carry both the video content and the quality assessment signal, enabling real-time assessment during broadcasting without requiring separate reference signal channels
3Measurement precision
If source video or characteristic information is transmitted for comparison-based assessment, then accurate quality measurement is possible, but the system becomes more complex and costly
Solution Approach 1:
The patent extracts the essential quality assessment function from the complex comparison-based system by using only a simple test signal instead of transmitting the entire source video or characteristic information. This extraction approach maintains measurement capability while significantly reducing system complexity and cost
4Extent of automation
If PSNR-based assessment is used, then objective measurement is achieved, but the results do not necessarily correlate with actual subjective video quality
Solution Approach 1:
The patent employs dynamic test signal patterns including multiple frequencies and time-varying characteristics that better reflect actual video content variations. This dynamic approach allows the assessment system to adapt to different video types and conditions, improving the correlation between objective measurement results and subjective quality perception compared to static PSNR methods
Data Source
AI summary
Provided is a video quality assessment system for digital TV. The video quality assessment system includes a video quality test signal insertion device which inserts a test signal for testing video quality into a predetermined area of a transient effect area (TEA) of each frame of a source video and a video quality measurement device which detects the test signal from a predetermined area of the video signal recovered after reception and outputs the test signal. Preferably, an insertion position of the test signal is one line or two or more lines of the TEA area which are located in a lower end portion of the video, and the test signal is configured with multi-bursts including a large number of frequencies which are in a range of DC to ½ of a sampling frequency.