Back to results
US 7,612,875 B2Granted
Personal identification system
AssigneeHitachi, Ltd.
InventorsMiyuki Kono, Shin-ichiro Umemura, Takafumi Miyatake, Kunio Harada, Yoshitoshi Ito, Hironori Ueki
Life of this patent
Estimating the term…
Abstract
A personal identification system, which uses a vein pattern of a finger, optimizes the amount of light of a light source based on a captured finger image and emphasizes the vein pattern during image processing for identification.
Claims16
A personal identification apparatus comprising:
- a light source stored in said personal identification apparatus;
- a window, provided on a surface of said personal identification apparatus, for transmitting light from the light source;
- an imaging unit which captures the light transmitted through a finger, which is to be captured, and irradiated on the finger through said window;
- and
- an image processing unit which extracts a vessel pattern of the finger for personal identification from an image which is captured by said imaging unit and which includes joint parts of the finger,
- wherein an amount of irradiated light of the light source is controlled in accordance with transmittance for each part of the finger based on position information on the joint parts of the finger extracted from information on the transmittance of the image captured by said imaging unit, and said image processing unit extracts the vessel pattern of the finger for personal identification from the image captured in accordance with the amount of the controlled irradiated light.
3 more elements
A personal identification apparatus comprising:
- a light source which irradiates light on a finger to be captured;
- an imaging unit which captures the light transmitted through the finger to be captured;
- and
- an image extracting unit which extracts a pattern of the finger, which is to be captured, from an image which is captured by said imaging unit and which includes joint parts of the finger
- wherein an amount of irradiated light of the light source is controlled in accordance with transmittance based on position information on the joint parts of the finger extracted from information on the transmittance of the image captured by said imaging unit, and said image extracting unit extracts a vessel pattern of the finger for personal identification from the image captured in accordance with the amount of the controlled irradiated light.
2 more elements
A vessel pattern extraction method comprising the steps of:
- irradiating a finger, which is to be captured, with light from a light source stored in a personal identification apparatus;
- capturing, by an imaging unit, light which is transmitted through a finger, which is to be captured, via a window provided on a surface of said personal identification apparatus;
- and
- extracting a vessel pattern of the finger for personal identification from an image which is captured by said imaging unit and which includes joint parts of the finger,
- wherein an amount of irradiated light of the light source is controlled in accordance with transmittance for each part of the finger based on position information on the joint parts of the finger extracted from information on the transmittance of the image captured by said imaging unit, and
- the vessel pattern of the finger for personal identification is extracted from the image captured in accordance with the amount of the controlled irradiated light.
3 more elements
Dependencies are inferred from the claim text.