JP2859794B2 - Individual identification method using finger sweat glands - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a personal identification method using a sweat gland of a finger when identifying a person based on finger information.

[0002]

2. Description of the Related Art When specifying an individual, a fingerprint is effective information, and the individual is specified based on, for example, positions of ridges and feature points of the fingerprint, pattern matching, and the like. However, in these methods, a sweat gland image input together with a ridge image or the like is treated as noise, and a method of eliminating a sweat gland image is mainstream. A method of effectively using a sweat gland image to specify a person is not a method. It does not exist at present.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve such a conventional problem, and focuses on a sweat gland image which has been conventionally treated as noise, and proposes a personal identification method using a sweat gland of a finger. The purpose is to provide.

[0004]

According to the present invention, there is provided a personal identification method based on sweat glands of a finger, wherein a fingerprint image is inputted and binarized.
The binarized image is thinned and labeled, the number of pixels in each group in the labeled image is counted, groups having a number of pixels equal to or more than a predetermined value are erased as concave portions between fingerprint ridges, and The group remaining after the elimination of the concave portion is defined as a sweat gland, and the number is compared with a previously registered number to identify an individual.

[0005]

In the personal identification method using the sweat glands of a finger according to the present invention, a fingerprint image is input and the image is binarized, so that a ridge portion of the fingerprint and a concave portion between the sweat gland portion and the ridge of the fingerprint can be determined. The binarized image is thinned and labeled, the number of pixels in each group is counted, and a group having the number of pixels equal to or more than a predetermined value can be eliminated as a concave portion of a ridge, so that only sweat glands can be extracted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a method for specifying an individual using sweat glands of a finger according to the present invention will be described with reference to the drawings. FIG. 1 is a flowchart for implementing the present invention, and FIG. 4 is a block diagram of an apparatus for implementing the present invention. This apparatus includes, for example, a central processing unit CPU, an image processing unit IPU, and an image memory I.
M, a central processing unit CPU, an image processing unit IPU
The image memory IM is connected by a system bus SB, and the image processing unit IPU and the image memory IM are connected by a local bus LB.

First, a fingerprint image touching the detection surface is input by an input device (not shown) (step 1-1), and the input image is aligned with reference to registered data (step 1-). 2). The registered input image is registered in the image memory IM (step 1-3), and the registered input image is stored in the image processing unit I via the local bus LB.
The data is taken into the PU and is binarized as shown in FIG. 2 (step 1-4). This separates the ridge of the fingerprint and the recess between the sweat gland and the ridge of the fingerprint.

Next, thinning processing is performed on the binary image (step 1-5). As a result of the thinning, the continuity of the concave portions between the ridges is maintained as shown in FIG. 3, but when the individual sweat glands are subjected to the thinning processing, almost all of them are close to the arcing point. The image is composed of pixels. Next, a labeling process is performed on the thinned image (step 1-6).

Then, the number of pixels of each group in the labeling image is counted by the central processing unit CPU (step 1-).
7). In this case, the number of pixels of the concave image between the ridges maintaining continuity increases, but the number of pixels of the image of the sweat gland near the isolated point decreases.

Next, a labeling image whose number of pixels is equal to or larger than a predetermined value is deleted (step 1-8). That is, when the number of pixels is equal to or less than a predetermined value, it is regarded as a sweat gland, and conversely, a labeling image having a number of pixels equal to or more than a predetermined value is regarded as a concave portion of a ridge of a fingerprint, thereby leaving only the sweat gland and eliminating the concave portion of the ridge. Is what you do.

Next, the number of sweat glands in the predetermined region A of the fingerprint is counted (step 1-9), and the number is compared with the number of sweat glands in the predetermined region of the person registered in advance to determine whether the difference is within an allowable range. A decision is made (step 1-10). If it is within the allowable range, the user is identified (step 1-11). However, if it is not within the allowable range, it is determined that the user is not the person (step 1-12).

[0012]

As described above, the personal identification method using the sweat glands of the finger according to the present invention inputs a fingerprint image and binarizes it.
The binarized image is thinned and labeled, the number of pixels in each group in the labeled image is counted, groups having a number of pixels equal to or more than a predetermined value are erased as recesses between fingerprint ridges, and the above-described operation in a predetermined region of the fingerprint is performed. Sweat glands are used as the remaining groups after the elimination of the depressions, and the number is compared with the pre-registered number to identify the individual, so that individuals can be identified quickly and easily based on sweat gland images that were conventionally treated as image noise. It has the effect of.

[Brief description of the drawings]

FIG. 1 is a flowchart showing one embodiment of the present invention.

FIG. 2 is a conceptual diagram of a binary image.

FIG. 3 is a conceptual diagram of a thinned image.

FIG. 4 is a block diagram of an apparatus for implementing the present invention.

[Explanation of symbols]

 CPU Central processing unit IPU Image processing unit IM Image memory SL System bus LS Local bus A Predetermined area

Claims (1)

(57) [Claims] 1. A fingerprint image is input, the input image is binarized, the binarized image is thinned, the thinned image is labeled, and the number of pixels of each group in the labeled image is counted. A group of fingers whose number of pixels is equal to or greater than a predetermined value is erased, and an input person is identified by comparing the number of groups remaining after the above-described group erasure in a predetermined area of the fingerprint with a previously registered number. Personal identification method by sweat glands.