Camera module, focusing adjustment system and focusing method

Abstract

The invention provides a camera module, a focusing adjustment system and a focusing method. The method comprises the steps of: obtaining measured data and to-be-measured data, wherein the measured data comprises the focusing position of the measured camera module, the corresponding modulation transfer function peak value and the corresponding measured proportion value, the to-be-measured data comprises a motor position of the to-be-measured camera module, a corresponding modulation transfer function value and a to-be-measured proportion value, each focusing position means that a corresponding modulation transfer function peak value exists at a position to which a motor of a corresponding tested camera module drives a lens to move, and the scale value is related to an area of a reference region in the image; determining a change relation according to the focusing position of the measured camera module in the measured data and the corresponding measured proportion value, wherein the change relation is the proportion of the lens displacement change and the proportion value change; and determining the next motor position of the to-be-detected camera module according to the to-be-detected data and the change relation.

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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