Video Image Timestamp Verification for Display Delay
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Solution Overview
Problem
Existing video image transmission systems experience significant delays when digitizing and processing images from multiple cameras, leading to outdated images being displayed on monitors, which can be critical in applications like traffic monitoring, where timely information is essential for safety.
Innovation Solution
Implementing a method where video images are provided with a time stamp, and only images within a predetermined time frame are displayed, ensuring that outdated images are not shown, and using identification codes to verify the correct image source, thereby preventing delays and misidentification of camera feeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If digital image processing and storage are implemented to improve image quality and suppress interference, then image quality is improved, but a time lag between camera and monitor becomes unavoidable
Solution Approach 1:
The patent applies preliminary action by pre-storing individual camera images in memory before they are needed for composite display. This allows the system to quickly retrieve and combine images without real-time processing delays, thereby maintaining high image quality while minimizing time lag between camera capture and monitor display.
2Ease of operation
If multiple video cameras are synchronized to display images simultaneously on a single monitor, then simultaneous display is achieved, but complex electronic circuits and specially adapted cameras are required
Solution Approach 1:
The patent applies segmentation by dividing the video signal into separate individual camera images, storing each in memory independently. This allows the system to retrieve and combine images from multiple cameras without requiring complex synchronization circuits, thereby achieving simultaneous display while reducing device complexity.
3Reliability
If images are stored in memory and displayed from memory to prevent errors, then error suppression is improved, but time delays occur and outdated images may be displayed
Solution Approach 1:
The patent applies feedback by implementing a timestamp verification system that continuously monitors the age of stored images. The control unit compares timestamps with current time to determine whether stored images are still valid for display, providing feedback control that prevents outdated images from being shown while maintaining error suppression benefits.
4Measurement precision
If timestamp verification is implemented to prevent outdated images, then time accuracy is improved, but device complexity increases due to additional processing
Solution Approach 1:
The patent applies self-service by embedding timestamps directly into the stored image data during the normal storage process. The timestamp verification is automatically performed by the control unit as part of the standard image retrieval and display sequence, eliminating the need for separate verification hardware or complex additional processing steps.
Data Source
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AI summary
Several video cameras (11) deliver images as analog or digital signals. These images are stored in a memory (19). The stored images are combined into a single image, which is converted into an analog or digital signal and fed to a monitor (16). To prevent outdated images from being displayed, all video frames are time-stamped, and this time stamp is stored along with the video frames in the memory (19). When the stored images are subsequently combined and converted into an analog or digital signal, the timestamps of the video frames are read and compared with the current time. Only if the timestamp is no more than a predefined time interval ago is the signal fed to the monitor (16).Furthermore, it is useful if the signals are provided with an identification code (26) so that it can be checked whether the signal supplied to the monitor (16) comes from the correct video camera (11) or whether the camera image is displayed in the correct area.