Image input apparatus, subject identification system, subject verification system and image input method
AssigneeCanon Kabushiki Kaisha
InventorKazuyuki Shigeta
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Abstract
The present invention provides high-accuracy image input capable of correcting for uneven lighting due to the shape of the subject, its reflectivity, its positioning and ambient light conditions, without increasing the scale of the circuitry or its costs. The image input apparatus of the present invention has an LED that projects light onto the subject, a sensor including a plurality of pixels arranged two-dimensionally and that detects light reflected back from the subject, and a controller that changes the LED irradiation conditions in a cycle longer than that for a single screen.
Claims14
An image input apparatus comprising:
- an irradiation device for irradiating a subject;
- a sensor provided with a plurality of picture elements (pixels) for detecting light from the subject;
- a drive circuit for driving the sensor;
- and
- a controller for controlling irradiation conditions of the irradiation device so as to change irradiation conditions for a first region inside the sensor and a second region inside the sensor different from the first region.
An image input method for irradiating a subject, detecting light from the subject using a sensor provided with a plurality of pixels and inputting an image, the method comprising the step of:
- controlling the irradiation device so as to change irradiation conditions for a first region inside the sensor and a second region inside the sensor different from the first region.
Dependencies are inferred from the claim text.