Active calibration method and system for multi-band multi-pass camera module

Abstract

The invention discloses an active calibration method and system for a multi-band multi-pass camera module. The method comprises the following steps: projecting light of a first wave band to the camera module; receiving a plurality of first images acquired by the photosensitive chip under the light of the first wave band; projecting light of a second wave band to the camera module; receiving a plurality of second images acquired by the photosensitive chip under the light of the second wave band; determining a first out-of-focus curve and a second out-of-focus curve; determining a first optimal optical back focus value and a second optimal optical back focus value; calculating the weighted sum of the first optimal optical back focus value and the second optimal optical back focus value according to a preset weight so as to obtain a final optical back focus value; and adjusting the distance between the optical lens and the photosensitive chip. In this way, the optimal optical back focus value of the camera module in different wavebands is comprehensively considered, so that the finally determined optical back focus value can give consideration to the imaging quality of the camera module in different wavebands.

Description

technical field [0001] The present application relates to the field of camera modules, and more particularly, to an active calibration method and system for a multi-band and multi-pass camera module. Background technique [0002] In recent years, camera modules have been widely used in many fields such as medical treatment, security, industrial production, and life. The camera module includes components such as a circuit board, a photosensitive chip, a lens holder, an optical filter, and an optical lens, wherein the photosensitive chip is used to receive imaging light and generate an imaging reaction to image a photographed target. [0003] The camera module can use light of different wavelength bands for imaging. In application scenarios with sufficient visible light (for example, in daytime scenes), the camera module can use visible light for imaging; in scenes with insufficient visible light (for example, in night scenes), the camera module can use light other than visib...

AI Technical Summary

Problems solved by technology

[0006] However, in the actual application process of the multi-band multi-pass camera module, a problem is found: the images obtained by the multi-band multi-pass camera module under different imaging conditions cannot all have satisfactory imaging quality.

Therefore, in the actual imaging process of the camera module, there is a problem that the imaging quality meets the requirements in one band, but the imaging quality is lower in another band.

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