Camera Platform Motion Prediction for Signal Delay Compensation
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Solution Overview
Problem
Conventional remote control camera platforms require separate expensive position detection mechanisms and are affected by signal delays, limiting their applicability and accuracy in synchronizing photographed and computer graphic images, especially in applications with long distances or variable connection delays.
Innovation Solution
A camera platform system with a CPU that calculates motion prediction positions and outputs accurate position information without a separate position detection mechanism, using open-loop control and backlash correction to manage motor operations and account for signal delays, allowing for precise synchronization of camera movements and image synthesis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an encoder-based position detection mechanism is added to the lens device, then measurement precision of position information is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent replaces the mechanical encoder-based position detection system with an electronic calculation system. The CPU calculates motion prediction position information based on drive control signals and predetermined delay time, eliminating the need for physical position detection mechanisms on the lens device. This substitution reduces device complexity while maintaining measurement precision through computational methods.
2Measurement precision
If an encoder-based position detection mechanism is added to the lens device, then measurement precision of position information is improved, but manufacturing cost increases
Solution Approach 1:
The patent eliminates expensive encoder hardware and replaces it with software-based position calculation in the CPU. The system computes motion prediction position information using drive control signals and delay time parameters, avoiding the need for costly position detection mechanisms. This approach significantly reduces manufacturing costs while maintaining the required measurement precision for image synthesis synchronization.
3Reliability
If delay factor compensation is implemented in the operation device, then reliability of position signal is improved, but device complexity increases
Solution Approach 1:
The patent implements delay time compensation by calculating the motion prediction position information in advance, considering the predetermined delay time between drive control signal issuance and actual lens movement. The CPU proactively adjusts the position calculation to account for this delay, ensuring accurate synchronization without requiring complex real-time compensation mechanisms in the operation device.
4Measurement precision
If the imaging system uses conventional remote control camera platform with separate position detection mechanism, then measurement precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent merges the position detection function into the existing CPU and control system of the camera platform. Instead of using a separate encoder mechanism on the lens, the system integrates position calculation within the CPU by analyzing drive control signals and applying delay time compensation. This integration eliminates the need for separate position detection hardware, reducing manufacturing complexity and cost while maintaining measurement precision.
Data Source
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Figure 2A~2C
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AI summary
The camera platform system (20) of the present invention operates at least one function selected from zoom/focus/tilt/pan/iris of a mounted camera (23) or lens (22) in response to an operation instruction output from an operation device (10). The camera platform system (20) includes a drive control unit (213a, 213b, 215, 216) configured to convert an operation instruction output from the operation device (10) into a drive control signal corresponding to any one motion of the zoom/focus/tilt/pan/iris; a motion prediction position calculation unit (211) configured to calculate a motion prediction position of any one of the zoom/focus/tilt/pan/iris based on the drive control signal converted by the drive control unit (213a, 213b, 215, 216); and a motion prediction position output unit (217) configured to output the motion prediction position, which has been calculated by the motion prediction position calculation unit (211), as motion prediction position information.