Wafer-level image acquisition device

Abstract

The invention discloses a wafer-level image acquisition device, which can form a three-dimensional full-face imaging beam by setting a light source emitter to output structured light to irradiate a human face; by setting a polarizer or a transparent cover plate with a polarizing effect, it can play Eliminate the effect of reflection; by setting a filter or a transparent cover with a filter effect, the visible light in the three-dimensional full-face imaging beam can be completely filtered out, and only light of a specific wavelength is retained; by setting the imaging lens array, it can collect The three-dimensional full-face imaging beam is focused on the photosensitive surface of the photosensitive chip of the image sensor, and then the super-resolution reconstruction algorithm is used to obtain high-definition irises and 3D faces. Since the multiple lenses of the imaging lens array are processed into a whole through the wafer-level packaging process, the optical axis is relatively consistent, the pixels are close to unity, and the discreteness is small, thus meeting the requirements of clear and high-fidelity texture of the iris and three-dimensional face, that is, Realize high-resolution imaging with large depth of field.

Description

technical field [0001] The invention relates to the field of biometric identification, in particular to a wafer-level image acquisition device that improves iris acquisition resolution and acquisition area range and 3D face acquisition resolution. Background technique [0002] Biometric recognition is mainly divided into three stages: image acquisition, image preprocessing, and feature extraction and matching. The impact of each stage on the final recognition effect is very important. [0003] At present, the relevant technologies of most companies in the market mainly focus on the iris algorithm, and the bottleneck of iris acquisition technology has not been broken through. How to eliminate the impact of the specular reflection of the cornea, spectacle lens and skin on iris recognition in image acquisition technology is one of the important issues. In the active lighting scheme or in other strong light source environments, the reflected light of the spectacle lens is stro...

AI Technical Summary

Problems solved by technology

[0005] At present, a single lens is used to collect iris and face images, and the existing products are basically divided into two categories: one is to collect images that meet the resolution requirements of the algorithm, but the depth of field is small, generally about 50mm; the other is to make the depth of field to more than 100mm, but the resolution of the iris image is lower than that required by the iris algorithm, which cannot satisfy both the resolution of the iris algorithm and the large depth of field

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