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Image Analysis

Finger-movement-detection-method-and-apparatus

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Finger movement detection method and apparatus

Details

Inventors: Nishikawa, Shou;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner: Chang; Kent
Assistant Examiner:
Attorney, Agent or Firm: Staas & Halsey LLP

A fingerprint area and a barycentric position of the area are obtained for a current sensor image, and an area near the barycentric position is divided into a plurality of small blocks. An image area that agrees with a fingerprint image is searched for, for each of the small blocks with respect to the fingerprint area in a previous sensor image. A candidate vector is obtained from a deviation between the position of the small block in the current sensor image and the position of the image area in the previous sensor image corresponding to the small block. A candidate vector with the highest matching degree between the fingerprint images in the current and previous sensor images is selected from the candidate vectors to obtain a detected vector, and the detected vector is corrected to exclude an influence of erroneous detection and to control a movement of a pointer.

DETAILED DESCRIPTION It is an object of the present invention to provide a specific method and specific configuration of an apparatus for detecting the finger movement from a fingerprint image.
In order to achieve the above object, the present invention has a feature as described below.
That is, a fingerprint in an area smaller than a fingertip is detected by using a fingerprint sensor having an area smaller than a fingertip.
A fingerprint area where a fingerprint image exists is specified in the detected current sensor image to thereby obtain a barycentric position of the area.
The area near the barycentric position is divided into a plurality of small blocks smaller than the fingerprint area.
The fingerprint area is also specified in an immediately preceding sensor image, and an image area that agrees with the fingerprint image in the small block is searched for, for each of the small blocks of the current sensor image, from the fingerprint area of the immediately preceding sensor image.
A candidate vector is determined from a deviation between the position of the small block in the current sensor image and the position of the image area in the immediately preceding sensor image corresponding to the small block.
A candidate vector having the highest matching degree between the fingerprint image in the current sensor image and the fingerprint image in the immediately preceding sensor image is selected from the candidate vectors obtained for each small block, and designated as a detected vector.
Correction for excluding the influence of fine fingertip movement and misdetection is carried out with respect to the detected vector to obtain a corrected vector for finally carrying out movement control of the pointer.
According to this invention, a fingerprint in an area smaller than a fingertip is detected, and a fingerprint area is specified respectively for the current sensor image and the past sensor image.
Areas in which the fingerprint images agree with each other are obtained in the respective fingerprint areas, and a vector representing the fingertip movement is obtained based on a displacement between the areas in which the fingerprint images agree with each other

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