Auto-focusing method and apparatus for projection apparatus and projection apparatus

Abstract

The present invention provides an auto-focusing method and apparatus for a projection apparatus and the projection apparatus, wherein a current acceleration value is detected by an acceleration sensorarranged in the projection apparatus; A main processor receives and determines whether that current acceleration value has changed; If yes, the image acquisition unit acquirs the second geometric parameter of the current identification image; ing an absolute difference between the first geometric parameter and the second geometric parameter can be determined according to the first geometric parameter determined based on the original identification image; whether the absolute difference value is greater than or equal to the adjusted geometric threshold value is judged; If yes, the electric motor is controlled to move to drive the optical machine, the image acquisition unit acquires the current image, the main processor receives the current image and determines the definition value of the current image, and when the definition value of the current image is greater than or equal to the definition threshold value, the electric motor is controlled to stop the movement;otherwise, the acceleration sensor continues to detect the current acceleration value. According to the invention, the accuracy of auto-focusing of the projection device is improved and the viewing experience of the useris enhanced.

Description

technical field [0001] The present invention relates to the field of projection technology, in particular to an automatic focusing method and device for projection equipment and projection equipment. Background technique [0002] Projection equipment is developing rapidly at present. In order to facilitate users to watch clear images, projection equipment usually uses an auto-focus method to adjust the focal length to achieve a clear display of the picture. Such as figure 1 As shown, the components that realize the automatic focus of the projection device include: video acquisition circuit, electric motor, acceleration sensor and main processor SOC. The working principle of the automatic focus is: when the acceleration sensor detects the acceleration change value, the main processor SOC controls the movement of the electric motor according to the acceleration change value, and the electric motor is driven to adjust the focal length of the projection lens. At the same time, ...

AI Technical Summary

Problems solved by technology

[0003] In order to enrich the playback function of the projection device and improve the user experience, the projection device is equipped with audio equipment. When the audio equipment is playing audio, the sound will drive the air to vibrate, and will also cause the vibration of the projection host. The vibration will be accelerated. The sensor collects and mistakenly thinks that the position of the projection host has changed, and then the main processor SOC will control the movement of the electric motor according to the acceleration change value to adjust the focal length of the projection lens and start the auto-focus action, thus causing the original clear picture to be triggered by mistake. After auto-focusing, it becomes blurred, which affects the clarity of the picture and reduces the user experience

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