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AssigneeCanon Kabushiki Kaisha
InventorKazuyuki Shigeta
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The present invention provides an image sensor device for living body authentication, which achieves both of a high precision and a high authentication speed while reducing costs of the image sensor device and miniaturizing the device. There is provided an inexpensive fingerprint authentication system having a high performance in, for example, a portable terminal. The image sensor device for acquiring image information has an image sensor element, a tone conversion unit having a variable gain amplifier, and a tone conversion characteristic changing unit, and the tone conversion characteristic changing unit is controlled so as to change offset conditions of an image signal and change the tone conversion characteristics during the acquiring of the whole image.
A sweeping type image sensor device for authentication, which successively picks up images of partial image information of an object to obtain the whole image of the object, the image sensor device comprising:
An authentication image acquiring method in a sweeping type image sensor device for authentication which successively picks up images of partial image information of an object to obtain the whole image of the object, the method comprising the steps of:
Dependencies are inferred from the claim text.