Vein imaging apparatus and vein image interpolation method

Abstract

The invention discloses a vein imaging device and a vein image interpolation method. The imaging element of the device includes a vein image data generation area that generates vein image data based on near-infrared light that is converged by a lens array, scattered in a living body, and transmitted through a vein, and a vein that includes light-shielded pixels and generates output from the light-shielded pixels. Thermal noise output data generation area for output values. The vein imaging device measures thermal noise based on thermal noise output data, and estimates an imaging temperature based on the measurement result. The vein imaging device generates a vein image by correcting vein image data by changing a black level reference value based on an estimated imaging temperature, and performs image interpolation processing based on the estimated temperature, wherein the black level reference value is a simple The output value of the data output from the imaging element when a black image is formed, wherein changing the black level reference value includes multiplying the black level reference value at normal temperature by a correction coefficient adjusted based on the imaging temperature.

Description

technical field [0001] The invention relates to a vein imaging device, a vein image interpolation method and a program. Background technique [0002] Biometric personal authentication is a very important technology for protecting rights in the future network society. In commercial transactions on the Internet where money, content, and rights can be stolen at any time on the network through counterfeiting, biometric personal authentication is particularly attractive as a technology for protecting areas that cannot be protected by encryption alone. However, biometric personal authentication using fingerprints and irises may not solve the problem of counterfeiting. In response to this problem, a personal authentication technology using a part of a vein pattern that is not easily imaged from the outside is expected to be a next-generation biometric personal authentication because of judgment accuracy and difficulty in forgery and counterfeiting. [0003] On the other hand, whe...

AI Technical Summary

Problems solved by technology

However, even with this method, it is difficult to limit the distance between the finger and the imaging device, and the user must place the finger at the same distance

Therefore, the reproducibility of certification cannot be ensured

Although contact or contactless devices with large sensors are ideal in principle, large sensor sizes lead to increased costs due to expensive optical materials

In addition, since the thermal noise generated in the sensor increases in proportion to the temperature rise, when the external temperature becomes high during imaging, there is a problem that the quality of the image used for authentication deteriorates and the authentication accuracy decreases

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