Focusing method of image detector

Abstract

The invention provides a focusing method for an image detector, and the method comprises the specific steps: obtaining an image of each pixel through obtaining a current value of each pixel; carrying out cross-correlation operation on the images between the pixels of the same photosensitive unit, and respectively obtaining a corresponding cross-correlation function curve and an autocorrelation function curve; analyzing the cross-correlation function curve, comparing current values of adjacent pixels of the light sensing unit, and determining whether the to-be-adjusted image detector is in an out-of-focus state or an inclined state according to a comparison result; and changing or maintaining the position of the image detector according to the self-correlation function curve and the state of the to-be-adjusted image detector so as to realize two-degree-of-freedom focusing of the image detector. The focusing method of the image detector provided by the invention can solve the problem of inclination measurement of the high-precision large-target-surface image detector.

Description

technical field [0001] The invention belongs to the technical field of image equipment, and in particular relates to a focusing method of an image detector. Background technique [0002] The focus sensor is the core component of camera equipment, which realizes the image capture function by converting optical signals into electrical signals. Taking a CMOS image sensor (CMOS Image Sensors, CIS) device as an example, it has been widely used in various fields due to its advantages of low power consumption and high signal-to-noise ratio. [0003] In the prior art, in order to improve the performance of the optical focus sensor, a Phase Detection Auto Focus (PDAF) technology is used for focusing. However, the focus sensor in the prior art only detects one degree of freedom (defocus along the axial direction) of the image plane position to drive the focus adjustment mechanism to adjust the focus plane position to achieve the in-focus state. Usually, in order to achieve multi-poi...

AI Technical Summary

Problems solved by technology

Usually, in order to achieve multi-point focusing, the focus detection pixels are integrated into the focus sensor, which will affect the image quality output by the image detector, which is very unfavorable for aerospace remote sensing image acquisition

And the focus sensor in the prior art is distributed in the focus sensor, which will have a certain impact on the image quality, which is not conducive to the acquisition of aerospace remote sensing images, and it only detects the defocus amount, which cannot be realized for the focal plane of a large target surface. Detection of inclination

Images