Automatic focusing method and device

Abstract

The invention discloses an automatic focusing method for a projector, comprising the following steps: an infrared laser emitter is triggered to emit infrared laser, the infrared laser is reflected when contacting an imaging carrier, and an infrared laser receiver receives reflected light; the time difference is calculated according to the infrared laser emitting time and the infrared laser receiving time, and the relative distance between the projector and the imaging carrier is calculated according to the time difference; whether the distance is within a preset range or not is judged, and ifthe distance is not within the preset range, a reminding signal is sent through an interaction device; a database is traversed to find a matching motor stepping number; and a motor moves according tothe motor stepping number to enable the projector to move to a preset position. The invention further discloses an automatic focusing projector. By means of the automatic focusing method and the projector provided by the invention, rapid and accurate focusing can be achieved.

Description

technical field [0001] The invention relates to the field of projection imaging, in particular to an automatic focusing method and device. Background technique [0002] The size of the image of the projector is different at different focal lengths, and the definition of the image is also different. In order to meet the effect of achieving a clear picture at different projection distances, the existing focusing methods are divided into two types - manual focus with a dial and automatic focus with camera image recognition. [0003] The former requires manual intervention and judges by the user's self-feeling whether the adjusted accuracy reaches the required accuracy, so the precise focusing effect is generally lacking; the latter uses a camera to capture the imaging image, and needs to capture the projection image multiple times to improve the clarity. In contrast, the autofocus speed is slow, and there is a shortcoming that the expected effect cannot be achieved if the scre...

AI Technical Summary

Problems solved by technology

[0003] The former requires manual intervention and judges by the user's self-feeling whether the adjusted accuracy reaches the required accuracy, so the precise focusing effect is generally lacking; the latter uses a camera to capture the imaging image, and needs to capture the projection image multiple times to improve the clarity. In contrast, the autofocus speed is slow, and there is a disadvantage that the expected effect cannot be achieved if the screen is blocked

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