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Method and device for acquiring interested area in palm print image

A region of interest and image technology, applied in the field of digital image processing and pattern recognition, can solve the problems of inapplicable real-time systems, time-consuming searching for the largest inscribed circle, etc., achieving good real-time performance, fast and accurate acquisition, and simple calculation. Effect

Active Publication Date: 2011-08-24
HANVON CORP
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Problems solved by technology

However, since searching for the largest inscribed circle is a very time-consuming task, this method is not suitable for real-time systems

Method used

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  • Method and device for acquiring interested area in palm print image
  • Method and device for acquiring interested area in palm print image
  • Method and device for acquiring interested area in palm print image

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Embodiment Construction

[0075] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0076] figure 1 It is a flow chart of an embodiment of a method for obtaining a region of interest of a palmprint image provided by the present invention. Such as figure 1 As shown, this embodiment specifically includes the following steps:

[0077] Step 101. Correction step: perform binarization on the palmprint image, and correct the palm in the binary palmprint image obtained by binarization to a vertical direction.

[0078] First, obtain the binary image of the palm from the palm image as the image to be processed, and obtain the binary image of the palm from the palm image can adopt multiple methods, for example: the method of Bayesian histogram probability estimation, the present invention does not do this limit.

[0079] The palm binary image is recorded as B, B(i, j) represents the pixel value of the i-...

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Abstract

The invention discloses a method and a device for acquiring an interested area in a palm print image, which belongs to the technical field of digital image processing and mode identification. The method comprises the following steps of: correcting, namely binarizing the palm print image, and correcting a palm in a binary palm print image which is acquired through the binarization to a vertical direction; determining the shape of the palm, namely detecting and classifying the shape of the palm, and determining a palm binary image as a totally-open palm binary image or a totally-closed palm binary image; positioning key points, namely positioning the key points of the palm binary image according to the acquired shape of the palm; and acquiring, namely acquiring the interested area in the palm print image according to the positioned key points. By the method and the device, the interested area in the palm print image in any shape can be acquired, and the interested area in the palm printimage can be quickly and accurately acquired under the condition that the shape of the palm is uncertain.

Description

technical field [0001] The invention relates to the technical field of digital image processing and pattern recognition, in particular to a method and device for acquiring a region of interest of a palmprint image. Background technique [0002] The extraction of the region of interest (Region of Interest, referred to as: ROI region) of the palmprint image is the basis of palmprint recognition, which is to determine a stable recognition region on the basis of obtaining the palm binary image. When collecting palmprints, the position and direction of the palm of each person are different. Even for the same person, the position and direction of the palm may be different each time, so the position and direction of the collected palmprint images will be different. These differences will have a greater impact on subsequent recognition. Therefore, before performing feature extraction and matching on the palmprint image, it is necessary to extract the ROI area of ​​the palmprint ima...

Claims

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Application Information

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IPC IPC(8): G06K9/00G06K9/32
Inventor 黄磊冯毅
Owner HANVON CORP
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