Camera module, focus adjustment system and focus method

Abstract

The invention provides a camera module, a focusing adjustment system and a focusing method. Obtain the measured data and the data to be tested. The measured data includes the measured quasi-focus position of the camera module, the corresponding peak value of the modulation transfer function and the corresponding measured ratio value. The data to be tested includes the motor position of the camera module to be tested, the corresponding modulation transfer function value and the measured ratio value. Each focusing position refers to a corresponding peak value of the modulation transfer function corresponding to the position to which the motor of the measured camera module drives the lens to move. The scale value is relative to the area of ​​the reference region in the image. The variation relationship is determined according to the quasi-focus position of the measured camera module in the measured data and the corresponding measured ratio value. The change relationship is the ratio of the lens shift change to the scale value change. The next motor position of the camera module to be tested is determined according to the data to be tested and the variation relationship.

Description

technical field [0001] The invention relates to a focus technology, in particular to a camera module, a focus adjustment system and a focus method. Background technique [0002] Generally speaking, the range in which the front and back of the focus point of the camera is relatively clear is called the depth of field (DoF). In optical imaging, especially video or photography, depth of field is the range of distances that can be clearly imaged in space. It is worth noting that the lens of the camera can only gather light to a certain distance, and moving away from the focus point will cause the image to gradually blur. However, at a certain distance, the degree of blurring of the image cannot be detected by the naked eye. And this distance is called the depth of field, such as figure 1 is a schematic diagram of the depth of field DoF of camera C. The imaging of the object O at the depth of field DoF is relatively clear. Furthermore, when the focus is set at the hyperfocal...

AI Technical Summary

Problems solved by technology

The disadvantage of two-stage focusing is that the parameters set by both cannot be controlled

For example, in the fine-tuning stage, it is impossible to obtain the relevant focusing value of the coarse-tuning stage, and it is impossible to perform subsequent optimization actions.

Also, using two-stage focusing would take too much time

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