Patent ID: 11934089
Assignee: CHENGDU XGIMI TECHNOLOGY CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 6:
7. A bidirectional compensation apparatus for projection thermal defocusing, comprising:
a first image acquisition module, configured to acquire projected picture images;
a second image acquisition module, configured to drive a motor to rotate in a first direction by a preset number of steps, and then acquire a projected picture image again;
a similarity determination module, configured to determine whether a similarity value between a current projected picture image and a previous projected picture image satisfies a preset similarity value requirement, in a case that the similarity value does not satisfy a preset similarity value requirement, return to the first image acquisition module, and in a case that the similarity value satisfies a preset similarity value requirement, proceed to a thermal defocusing compensation module; and
the thermal defocusing compensation module, configured to calculate definition values of the current projected picture image and a definition value of the previous projected picture image, and perform first-direction thermal defocusing compensation or second-direction thermal defocusing compensation according to a comparison result of two definition values which comprises a definition value of the current projected picture image and a definition value of the previous projected picture image;
wherein the thermal defocusing compensation modules comprises: a definition calculation unit, configured to calculate the definition values of the current projected picture image and a definition value of the previous projected picture image; a definition determination unit, configured to determine whether the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, in a case that the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, proceed to a first-direction thermal defocusing compensation unit, and in a case that the definition value of the current projected picture image is not greater than or equal to the definition value of the previous projected picture image, proceed to a second-direction thermal defocusing compensation unit; the first-direction thermal defocusing compensation unit, configured to drive the motor to rotate in the first direction by the preset number of steps, and then acquire a projected picture image again; calculate a definition value of the current projected picture image and a definition value of the previous projected picture image, and determine whether the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, in a case that the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, return to a step of driving the motor to rotate in the first direction by the preset number of steps, and then acquiring a projected picture image again to start re-execution, until the definition value of the current projected picture image is less than the definition value of the previous projected picture image, and then drive the motor to move in a second direction by a preset number of steps, so as to complete thermal defocusing compensation; and the second-direction thermal defocusing compensation unit, configured to drive the motor to rotate in the second direction by a preset number of steps, and then acquire a projected picture image again, calculate a definition value of the current projected picture image and a definition value of the previous projected picture image, and determine whether the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, in a case that the definition value of the current projected picture image is greater than or equal to the definition value of the previous projected picture image, return to the step of driving the motor to rotate in the second direction by a preset number of steps, and then acquiring a projected picture image again to start re-execution, until the definition value of the current projected picture image is less than the definition value of the previous projected picture image, and then drive the motor to move in the first direction by a preset number of steps, so as to complete thermal defocusing compensation.