PTZ Camera Video Stream Segmentation for Bandwidth Control
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Solution Overview
Problem
PTZ cameras in bandwidth-restricted environments experience jitter and delay due to repeated signal bouncing, leading to degraded video quality and reduced responsiveness, particularly in wireless setups, with existing solutions either compromising on resolution or frame rate, affecting user interaction and image clarity.
Innovation Solution
The method involves providing a video stream with a main image and a smaller picture-in-picture overlay, where the overlay has a higher frame rate and lower resolution compared to the main image, allowing users to switch between them for improved control and image detail, while reducing bandwidth usage by encoding the overlay as inter-frames referencing the main image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the bandwidth is reduced by lowering the frame rate while maintaining high resolution, then the video quality is improved, but the camera responsiveness and user control capability deteriorate
Solution Approach 1:
The video stream is segmented into two distinct components: a high-resolution main image stream and a lower-resolution overlay stream with higher frame rate. This segmentation allows each stream to be optimized independently for its specific purpose, resolving the contradiction between video quality and responsiveness.
Solution Approach 2:
The solution adds a temporal dimension by incorporating an overlay that updates at a different frame rate than the main image. This dimensional approach allows the system to provide both high-resolution static information and high-speed dynamic information simultaneously, overcoming the frame rate limitation.
2Speed
If the bandwidth is reduced by lowering the resolution while maintaining high frame rate, then the camera responsiveness is improved, but the image clarity and object identification capability deteriorate
Solution Approach 1:
The video stream is segmented into two distinct components: a high-resolution main image stream and a lower-resolution overlay stream with higher frame rate. This segmentation allows each stream to be optimized independently for its specific purpose, resolving the contradiction between video quality and responsiveness.
Solution Approach 2:
Different parts of the video stream have different quality characteristics: the main image maintains high resolution for clear object identification, while the overlay uses lower resolution but higher frame rate for tracking moving objects. This local quality differentiation resolves the contradiction between image clarity and responsiveness.
3Manufacturing precision
If a high frame rate and high resolution video stream is maintained, then the image quality and responsiveness are improved, but the bandwidth consumption increases
Solution Approach 1:
The video stream is segmented into two distinct components: a high-resolution main image stream and a lower-resolution overlay stream with higher frame rate. This segmentation allows each stream to be optimized independently for its specific purpose, resolving the contradiction between video quality and responsiveness.
Solution Approach 2:
The solution changes the parameters of the video stream by creating two streams with different resolutions and frame rates. The main image stream maintains high resolution with moderate frame rate, while the overlay stream uses lower resolution with high frame rate, collectively providing both quality and responsiveness without requiring a single high-bandwidth stream.
Data Source
AI summary
Methods and apparatus, including computer program products, for controlling a Pan-Tilt-Zoom (PTZ) camera. A video stream is provided by the PTZ camera. The video stream includes a main image and a smaller picture-in-picture overlay. The main image and the overlay show the same view. The overlay has both a higher frame rate and a lower resolution compared to the main image. A movement control instruction is received, by the PTZ camera, in response to an evaluation of at least one of the main image and the overlay.