Camera back focus adjustment method and camera back focus adjustment device

Abstract

The invention discloses a camera back-focus adjustment method and a camera back-focus adjustment device. The camera back-focus adjustment method comprises the following steps of: judging whether an image sensor is located at a near end; if the image sensor is located at the near end, then executing a far-end focusing process and determining the position where the maximum focusing evaluation value occurs; if the image sensor is not located at the near end, then executing a near-end focusing process and determining the position where the maximum focusing evaluation value occurs; locking the image sensor at the position where the maximum focusing evaluation value occurs, wherein the far-end focusing process means a process of taking the far end of the image sensor as an initial movement direction, and searching the maximum focusing evaluation value by moving the image sensor; the near-end focusing process means a process of taking the near end of the image sensor as an initial movement direction, and searching the maximum focusing evaluation value by moving the image sensor. The technical scheme provided by the invention is capable of realizing an automatic adjustment for the back-focus of a camera.

Description

technical field [0001] The invention relates to the field of cameras, in particular to a camera back focus adjustment method and a camera back focus adjustment device. Background technique [0002] Auto Back Focus (ABF, Auto Back Focus) technology is a technology that adjusts the front and rear positions of the target surface of the image sensor (Sensor), so that the image accurately falls on the photosensitive surface of the image sensor. [0003] Whether the installation of the lens is reasonable, in addition to ensuring that the optical axis is at the optical center of the Sensor, it is also necessary to consider whether the back focus is reasonable. In the bullet camera, no matter which method is used to fix the Sensor target surface, the following problems will be encountered: structure The assembly error or optical devices such as optical low pass filter (OLPF, Optical Low Pass Filter) need to be added to the optical path to cause the optical path to change, so that pa...

AI Technical Summary

Problems solved by technology

However, in the subsequent use process, due to long-term vibration and other reasons, the installation position of the Sensor may change, resulting in virtual focus. At this time, we can only arrange engineering personnel to go to the site to solve the problem and readjust the Sensor installation of the bullet camera. Location

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