Video Frame Rate Control via Phase Difference Detection
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Solution Overview
Problem
In real-time digital video systems, varying random delays in transmission channels, such as packet-based networks, cause asynchronous reception of video image sequences, leading to display synchronization issues and jerky video playback due to mismatched frame rates between the sender and receiver.
Innovation Solution
A control device adjusts the video sequence image frame rate by determining the phase difference between image display and reception, controlling the display of subsequent images to synchronize with the receiver's frame rate, using techniques like adjusting pixel clock frequency and synchronization information lengths to ensure steady and robust video playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display redraws the current image and waits until an entire complete image has been received before displaying, then the display synchronization is improved, but the image display delay increases and video quality deteriorates
Solution Approach 1:
The control device performs preliminary actions by displaying the current image before receiving the complete next image. It predicts when the next image will be ready and prepares the display timing accordingly, allowing the display to show images continuously without waiting for complete reception of each frame, thus reducing display delay while maintaining synchronization.
Solution Approach 2:
The system dynamically adjusts the display timing based on actual reception conditions. The control device continuously monitors when images are received and adapts the display schedule in real-time, allowing flexible scheduling that reduces delay while ensuring synchronization, rather than using fixed predetermined timing.
2Reliability
If the display redraws the current image until the next image is completely received, then the display synchronization is improved, but the video quality deteriorates due to jerkiness and irregularities
Solution Approach 1:
The control device displays the current image before the next image is fully received, performing the display action in advance. This eliminates the need to hold the current image until the next one is complete, preventing the jerkiness and irregularities that occur when images are redrawn repeatedly, thus maintaining smooth video quality while ensuring synchronization.
Solution Approach 2:
The system maintains continuous useful action by continuously displaying images without interruption. The control device schedules display times based on predicted reception times, ensuring that images are displayed continuously and smoothly without the interruptions and redraws that cause quality deterioration, while still maintaining synchronization with the received image sequence.
3Reliability
If the display waits for complete image reception before displaying, then the display synchronization is improved, but the productivity decreases due to increased delay
Solution Approach 1:
The control device performs preliminary display actions by showing images before they are completely received. It predicts reception times and schedules display accordingly, allowing the system to maintain high productivity with minimal delay while ensuring synchronization, rather than waiting for complete reception which reduces productivity.
Solution Approach 2:
The system dynamically optimizes the balance between synchronization and productivity by continuously adjusting display timing based on actual reception conditions. This dynamic scheduling allows the system to maintain high video transmission efficiency while ensuring synchronization, avoiding the productivity loss associated with waiting for complete image reception.
Data Source
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AI summary
The present invention relates to a control device for adjusting the video sequence image frame rate of a display, wherein the video sequence images are transmitted over a transmission channel in a real-time video system. The control device is arranged to display a first video sequence image and receive a second video sequence image. The control device is characterized in that it is further arranged to determine a phase difference between the display of the first video sequence image and the reception of the second video sequence image, and adjust the video sequence image frame rate of the display by controlling the display of the second video sequence image based on the phase difference.