Intelligent Moving Head Light Machine Vision Auto-Focusing
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Solution Overview
Problem
Existing intelligent moving head lights face challenges with slow focusing speed and poor real-time performance when multiple lights are controlled simultaneously, leading to suboptimal imaging sharpness in dynamic stage environments.
Innovation Solution
An intelligent focusing method based on machine vision, utilizing a controller, camera, stepper motor, and optical lens assembly, which prestores coordinate positions for the focusing assembly, employs a hill-climbing search strategy and sharpness evaluation function to quickly adjust the focusing assembly and ensure clear imaging, leveraging the cam curve of a two-component zoom optical system to limit the search range and improve focusing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual focusing is used to maintain imaging sharpness in follow spot scenes, then imaging sharpness can be maintained, but focusing speed is slow and real-time performance deteriorates when multiple lights are controlled simultaneously
Solution Approach 1:
The patent replaces manual mechanical focusing operations with an automated machine vision system. A camera captures projected images, and a controller automatically adjusts the focusing assembly position based on image sharpness evaluation, eliminating the need for manual intervention and enabling rapid automatic focusing when multiple lights operate simultaneously
Solution Approach 2:
The patent implements a feedback control loop where the camera continuously monitors the sharpness of projected images, and the controller adjusts the focusing assembly position based on this feedback. The system evaluates image sharpness metrics and iteratively optimizes focus until the desired sharpness threshold is achieved, enabling real-time adaptation to changing projection conditions
2Measurement precision
If the focusing assembly search range is not limited, then the optimal focusing position can be found, but focusing time increases and real-time performance deteriorates
Solution Approach 1:
The patent applies preliminary action by prestoring coordinate positions corresponding to different projection distances before actual focusing is needed. When focusing is required, the system first determines the projection distance and directly retrieves the corresponding pre-calculated focusing position, avoiding a full search and significantly reducing focusing time while maintaining accuracy
Solution Approach 2:
The patent changes the parameter search strategy by using projection distance as a key parameter to directly determine focusing position. Instead of searching through all possible focusing positions, the system uses the measured projection distance to select from pre-stored coordinate positions, transforming a time-consuming spatial search into a rapid parameter-based lookup
Data Source
AI summary
An intelligent focusing method of an intelligent moving head light based on machine vision includes the following steps: prestoring coordinate positions Z21 and Z22 of the focusing assembly corresponding to stage light projection distances Smax and Smin respectively, moving the focusing assembly to a position between Z21 and Z22 after the controller receives a command to start an automatic focusing function; gradually moving the focusing assembly between Z21 and Z22 by a focusing search strategy, calculating a sharpness evaluation value Tn of a current projected image according to an image sharpness evaluation function, and determining whether Tn is greater than a preset high sharpness threshold TH if yes, completing the focusing, otherwise determining whether Tn is less than or equal to Tn-1, if yes, driving the stepper motor by the driver to operate in an opposite direction, otherwise driving the stepper motor by the driver to operate in an original direction, until Tn is greater than TH.