PTZ Camera Latency Reduction via Direct Motor Driver Parsing
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Solution Overview
Problem
PTZ cameras experience significant latency due to complex communication protocols, leading to delayed and inefficient pan, tilt, and zoom responses when controlled via input devices like joysticks or keyboards, making it difficult to track objects smoothly.
Innovation Solution
The proposed solution involves a control protocol request sub-module that extracts and processes pan, tilt, and zoom requests directly within the motor driver unit, bypassing the HTTP and ONVIF parser and processor modules, utilizing a simple text parser to accelerate parsing and reduce latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If complex communication protocols (HTTP, ONVIF) are used to control PTZ functions, then compatibility and standardization are improved, but response latency increases significantly (175-261 ms)
Solution Approach 1:
The patent segments the control processing path by separating PTZ control commands from general HTTP/ONVIF processing. A dedicated control protocol request sub-module extracts and handles PTZ commands independently, creating a parallel processing path that bypasses the complex protocol stack for time-critical operations.
Solution Approach 2:
The patent introduces a simple text parser as an intermediary component between the network interface and motor driver. This intermediary uses lightweight regex-based parsing instead of full HTTP/ONVIF protocol stacks, achieving both protocol compatibility and low-latency response by mediating between the two requirements.
2Reliability
If multiple processing modules (HTTP parser, ONVIF parser, processor modules) are used to handle control requests, then protocol compliance is improved, but device complexity and processing overhead increase
Solution Approach 1:
The processing architecture is segmented into distinct functional modules: a control protocol request sub-module for rapid PTZ command extraction, a simple text parser for lightweight syntax analysis, and motor driver units for direct actuation. This segmentation eliminates redundant processing stages while maintaining protocol compliance.
Solution Approach 2:
The patent extracts the essential PTZ control functionality from the complex HTTP/ONVIF protocol processing chain. By taking out only the necessary control elements and handling them through a simplified dedicated path, the system maintains protocol compliance for compatibility while removing unnecessary processing complexity.
3Adaptability or versatility
If standard HTTP and ONVIF parsing processes are used, then interoperability with control systems is improved, but response speed and tracking capability deteriorate
Solution Approach 1:
The patent implements preliminary action by pre-configuring the control protocol request sub-module with regex patterns for common PTZ command formats. This allows the system to immediately recognize and process standard PTZ commands without undergoing full protocol validation, achieving both interoperability and high-speed response.
Solution Approach 2:
The patent changes the processing parameters from full protocol stack validation to lightweight regex-based pattern matching. This parameter change maintains compatibility with standard PTZ command formats (ensuring interoperability) while dramatically reducing processing time to achieve high response speed.
Data Source
AI summary
An apparatus, system, and method to reduce PTZ latency are provided. The system can include an input port and a motor driver unit, and the input port can receive a PTZ request. The input port can transmit the PTZ request to the motor driver unit, and the motor driver unit can extract a PTZ command from the PTZ request. In some embodiments, the PTZ request can obviate transmission through a parser and a processor.