Video Test System Circular Buffer Capture
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Solution Overview
Problem
Current video test systems lack the ability to effectively reproduce problematic video sequences for further testing, as they are limited to specific test patterns and do not provide captured video data in a format usable by other systems or applications.
Innovation Solution
A video test system that captures video sequences using a circular buffer and generates test sequences based on captured data, with a trigger system and format converter to convert raw video data into serial transmission formats, enabling the creation of custom test signals suitable for various applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video test systems use fixed test patterns from a video test generator, then the testing process is simple and standardized, but the ability to reproduce problematic video sequences and adapt to various real-world scenarios is limited
Solution Approach 1:
The system captures actual problematic video sequences from the video source and copies them into the circular buffer. These captured sequences are then reused as test patterns, allowing the system to reproduce real-world problematic scenarios without requiring complex custom test pattern generation. This copying approach enables versatility while maintaining relative system simplicity.
Solution Approach 2:
The system performs preliminary capture of video sequences into the circular buffer before they are needed for testing. By pre-capturing and storing sequences in the circular buffer, the system prepares test material in advance, allowing rapid reproduction of problematic sequences during testing without adding complex real-time processing capabilities.
2Adaptability or versatility
If the captured raw video data is stored in the circular buffer, then the video data is available for further analysis, but the data is not provided in a format that is readily used by other systems or applications
Solution Approach 1:
The format converter acts as an intermediary between the circular buffer (containing raw captured data) and external systems. It translates the raw video data format into standard formats such as YUV, RGB, or other commonly used video formats, making the data compatible with other systems and applications while preserving the captured information.
Solution Approach 2:
The system changes the data format parameters by converting the raw video data into different standard formats. This involves modifying the data representation parameters (color space, bit depth, sampling format) to match the requirements of various external systems, thereby improving compatibility without losing any captured information.
3Extent of automation
If the trigger system captures video data based on internal triggers such as CRC errors or gamut errors, then the capture is automated and responsive to video quality issues, but the captured data requires additional processing to be useful for testing
Solution Approach 1:
The format converter serves as an intermediary processing step that automatically transforms the captured raw data into usable formats. This automated conversion eliminates manual processing requirements, allowing the system to maintain high automation in capture while also ensuring the captured data is immediately ready for testing in various formats.
Data Source
AI summary
A video test system is provided with a circular buffer to capture a video input sequence in response to a trigger, and a test generator output to generate a video test sequence based upon the captured video test sequence. The system may be implemented using a single instrument, or a combination of instruments, such as video waveform monitors and video signal generators. A method is also provided for generating video test sequences based upon captured video sequences.