Intelligent Focusing Method Of Intelligent Moving Head Light Based On Machine Vision

An intelligent focusing method of an intelligent moving head light based on machine vision, wherein the intelligent moving head light comprises a controller, a camera, a driver, a stepper motor and an optical lens assembly that includes a focusing assembly and a zooming assembly;

• the intelligent focusing method comprising the following steps:
• S1, prestoring coordinate positions Z21 and Z22 of the focusing assembly corresponding to stage light projection distances Smax and Smin respectively, and moving the zooming assembly to a position between Z21 and Z22 after the controller receives a command to start an automatic focusing function;
• S2, 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, the focusing step is completed, otherwise executing step S3;
• and
• S3, 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, and then repeatedly executing step S2 until the sharpness evaluation value Tn is greater than the preset high sharpness threshold TH to complete the focusing step.