Patent application number | Description | Published |
20100056936 | BLOOD FLOW RATE IMAGING DEVICE - Provided is a blood flow rate imaging device that can automatically distinguish an artery and a vein from a blood flow rate obtained on a time series blood flow map. A blood flow rate imaging device of the present invention includes a laser beam irradiation system ( | 03-04-2010 |
20110026783 | PERSONAL AUTHENTICATION METHOD USING SUBCUTANEOUS BLOODSTREAM MEASUREMENT AND PERSONAL AUTHENTICATION DEVICE - In a personal authentication method using the subcutaneous bloodstream measurement where an expanded laser beam is irradiated onto a finger pad, light reflected from a subcutaneous blood vessel layer is imaged on an image sensor as a laser speckle using an optical system, a quantity that represents the rate of change with respect to time of the amount of light received for each pixel of the laser speckle is calculated, the values are used as a two-dimensional map to obtain a map showing the bloodstream of the finger pad, and the bloodstream map is comparison-checked against pre-registered data of individuals, the laser speckle is imaged on the image sensor using a region separate from a region irradiated by the laser beam as an observation region of the image sensor. A device for use in the method is also provided. Relating to a method and device for authentication using, e.g., a finger print pattern on the basis of the laser speckle, an improved technique capable of extracting, e.g., the finger print pattern accurately is provided. | 02-03-2011 |
20110033091 | METHOD OF AUTHENTICATING INDIVIDUAL AND APPARATUS OF AUTHENTICATING INDIVIDUAL USED FOR THE SAME - Individual authentication method and apparatus therefor, wherein at least one information out of an eyeground blood vessel image information obtained by an optical means, eyeground blood flow distribution image information obtained by using a laser, and information relating to the change over time thereof is compared and collated with personal information registered in advance, and at least the one information out of the eyeground blood vessel image information, the eyeground blood flow distribution image information, and the information relating to the change over time thereof within a measurement field of view obtained in a direction of a line of sight fixed by a fixation target registered in advance is compared and collated with the personal information registered in advance. The fixation target for fixing the direction of the line of sight may be selected from a plurality of fixation points, such as a part of a character string, a part of a still image, or a part of a moving picture, and has an information of which of them to fixedly view registered in advance. An improved technology for further reinforcing the individual authentication method using measurement of an eyeground blood vessel pattern or an eyeground blood flow distribution is provided. | 02-10-2011 |
Patent application number | Description | Published |
20100168585 | PERSONAL AUTHENTICATION METHOD AND PERSONAL AUTHENTICATION DEVICE UTILIZING FINGER-TIP BLOOD FLOW MEASUREMENT BY LASER LIGHT - A personal authentication method is provided that includes imaging, on an image sensor as a laser speckle using an optical system, light reflected from a blood vessel layer in subcutaneous and internal tissues when a laser beam is expanded and made to irradiate a finger pad, calculating a quantity that represents the rate of change with respect to time of the amount of light received for each pixel of the laser speckle, obtaining a finger pad blood flow map as a two-dimensional map of the numerical values, and comparison-checking the blood flow map against pre-registered data of individuals, wherein using a near-infrared laser beam or using this in combination with a visible laser beam, comparison-checking against pre-registered data of individuals is carried out using a pattern reflecting a fingerprint occurring within the finger pad blood flow map obtained from reflected light and, observed superimposed thereon, an internal tissue blood flow distribution pattern, and there is also provided a device used for the method. | 07-01-2010 |
20110319775 | BLOOD FLOW IMAGE DIAGNOSING DEVICE - The present invention provides a blood flow image diagnosis device comprising: a laser beam irradiation system that irradiates an observation region of a body tissue with a laser beam; a light receiving system having a light receiver including a large number of pixels that detects reflected light from the observation region of the body tissue; an image capture section that continuously captures a plurality of images for a specified time that is one or more cardiac beats on the basis of a signal from the light receiver; an image storage section that stores the plurality of images; an arithmetic section that calculates a blood flow rate in the body tissue from the time variation of the output signal of each pixel corresponding to the plurality of the stored images; and a display section that displays the two-dimensional distribution of the calculation result as a blood flow map; wherein the blood flow image diagnosis device has a function for analyzing the blood flow map, the arithmetic section has a function that separates a blood flow of a blood vessel observed in a surface layer in the observation region of the body tissue from a peripheral background blood flow on the basis of a plurality of blood flow map data for a time that is one or more cardiac beats, and the display section has a function that distinguishably displays each blood flow on a blood flow map. The blood flow image diagnosis device has an additional function for diagnosing blood flow images as compared to a conventional device. | 12-29-2011 |
Patent application number | Description | Published |
20090177098 | Examination System and Examination Method - The blood flow is examined by making multifractal analysis of a blood flow velocity distribution in a vascular network and detecting a deviation of the blood flow velocity distribution from the multifractal distribution. The blood flow velocity distribution is provided as an image by irradiating laser light to the vascular network, converging, by an imaging lens, scattered laser light rays by blood cells in the blood flowing through blood vessels, detecting, by a photodetector, a speckle pattern produced owing to random interference between the scattered laser light rays and calculating the rate of change with time lapse of each speckle in the speckle pattern. | 07-09-2009 |
20090202113 | PERSONAL AUTHENTICATION METHOD AND PERSONAL AUTHENTICATION DEVICE UTILIZING OCULAR FUNDUS BLOOD FLOW MEASUREMENT BY LASER LIGHT - A personal authentication method comprising imaging, on an image sensor as a laser speckle using an optical system, light reflected from retinal blood vessels of the ocular fundus and a blood vessel layer in ocular fundus internal tissue when a laser beam is expanded and made to irradiate the ocular fundus, calculating a quantity that represents the rate of change with respect to time of the amount of light received for each pixel of the laser speckle, obtaining an ocular fundus blood flow map as a two-dimensional map of the numerical values of the quantity, and comparison-checking against pre-registered personal data utilizing at least one, observed in the blood flow map, of blood flow distribution data, a pattern reflecting the course of retinal blood vessels, a pattern reflecting the course of blood vessels in ocular fundus internal tissue observed superimposed thereon, and data on changes thereof over time, and a device therefor. In accordance with the method and device of the present invention utilizing the ocular fundus blood flow rate map, a personal authentication method and device can be obtained that have remarkably higher accuracy than conventional methods and devices. | 08-13-2009 |