Pan-Tilt Camera Speed Control for Video Encoding Efficiency
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Solution Overview
Problem
High bit rates in video streams from pan-tilt cameras result from increased computational complexity due to large motion vector search ranges, making it difficult to achieve efficient encoding, especially during rapid adjustments of the field of view.
Innovation Solution
A method that adjusts the speed of pan-tilt camera movements based on threshold speeds derived from the motion vector search range, ensuring that most pixel blocks are encoded using P-blocks by capping the adjustment speed within the encoder's capabilities, thereby reducing processing time and bit rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the motion vector search range of the encoder is increased to handle rapid pan/tilt adjustments, then the encoder can accommodate larger FOV changes, but the computational complexity and processing time increase significantly
Solution Approach 1:
The patent applies dynamics by making the motion vector search range adjustable and adaptive rather than fixed. The encoder dynamically adjusts the search range based on the actual pan/tilt speed of the camera, allowing it to accommodate varying FOV adjustment rates without permanently increasing computational complexity for all scenarios
Solution Approach 2:
The patent changes the parameter of motion vector search range based on camera movement characteristics. By calculating the pan/tilt speed and comparing it against threshold values, the system adjusts the search range parameter to match the actual adjustment magnitude, optimizing the balance between handling capability and computational load
2Speed
If the pan/tilt adjustment speed is increased to respond quickly to user input, then the camera responds faster to FOV changes, but the bit rate increases due to more I-blocks being required
Solution Approach 1:
The patent implements feedback by continuously monitoring the pan/tilt adjustment speed and using this information to control the motion vector search range. The system measures the actual camera movement, compares it to threshold values, and adjusts encoding parameters accordingly, creating a closed-loop control that optimizes bit rate based on real-time movement characteristics
Solution Approach 2:
The patent applies partial action by adjusting the motion vector search range to match the actual need rather than always using the maximum range. When pan/tilt speed is below the second threshold, the search range is limited to what is actually required, avoiding unnecessary computational overhead and reducing bit rate while still capturing the essential motion
3Productivity
If the motion vector search range is kept small to reduce computational complexity, then encoding is more efficient, but the encoder cannot handle rapid pan/tilt adjustments effectively
Solution Approach 1:
The patent makes the motion vector search range dynamic rather than static. The search range adjusts in real-time based on the calculated pan/tilt speed, allowing the encoder to maintain high efficiency during normal operation while automatically expanding capacity when rapid FOV adjustments occur
Data Source
AI summary
The present invention relates generally a method and device for controlling a camera capable of pan and tilt control, and more specifically a method and device for controlling adjustments of the field of view of such camera.