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

Claim 0:
1. A bidirectional compensation method for projection thermal defocusing, comprising:
S11: acquiring projected picture images;
S12: driving a motor to rotate in a first direction by a preset number of steps, and then acquiring a projected picture image again;
S13: determining 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, returning to S11, and in a case that the similarity value satisfies a preset similarity value requirement, proceeding to S14; and
S14: calculating definition values of the current projected picture image and a definition value of the previous projected picture image, and performing 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 S14 comprises: S141: calculating the definition values of the current projected picture image and the definition value of the previous projected picture image; S142: determining 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, proceeding to S143, 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, proceeding to S144; S143: performing first-direction thermal defocusing compensation: driving the motor to rotate in the first direction by the preset number of steps, and then acquiring a projected picture image again, calculating a definition value of the current projected picture image and a definition value of the previous projected picture image, and determining 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, returning to the 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 driving the motor to move in the second direction by the preset number of steps, so as to complete thermal defocusing compensation; and S144: performing second-direction thermal defocusing compensation; driving the motor to rotate in the second direction by the preset number of steps, and then acquiring a projected picture image again, calculating a definition value of the current projected picture image and a definition value of the previous projected picture image, and determining 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, returning to the step of driving the motor to rotate in the second 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 driving the motor to move in the first direction by a preset number of steps, so as to complete thermal defocusing compensation.