Acquisition processing method of fingerprint images and device
A fingerprint image and fingerprint collection technology, applied in the fields of instruments, character and pattern recognition, computer parts, etc., can solve the problem of the person being collected does not cooperate, the machine crashes, and the quality of the fingerprint is affected, so as to avoid false collection or mistaken for a machine. The effect of crashing and increasing speed
Inactive Publication Date: 2017-05-17
方正国际软件(北京)有限公司 +1
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Problems solved by technology
[0002] In the process of fingerprint collection, there are many cases where the fingerprints of the collection objects are damaged or the persons to be collected do not cooperate, which greatly affects the results of fingerprint collection.
The determination of the start and end of fingerprint collection is inaccurate, and it is easy to mistakenly collect or mistakenly think that the machine is crashed, and the fingerprint integrity of the person whose fingerprint is damaged is insufficient, lacking feature points, and it is easy to fail to collect due to unqualified fingerprint image quality judgment
[0003] After the fingerprint image is collected, in the process of judging the quality of the fingerprint image, the size of the fingers is not the same. Simply distinguishing according to the size will make some small fingerprint images unable to be collected; when the fingerprint is too wet or too dry, it will also affect the quality of the fingerprint. ; During the process of fingerprint collection or splicing, problems such as motion blur or mismatch will occur, which will make the fingerprint image blurred; factors such as the position of the fingerprint not being in the center of the fingerprint image will cause offsets and other factors that will affect the quality of the fingerprint image to a certain extent. In the prior art, when judging the fingerprint image quality, only a comprehensive quality score is calculated, without specific indicators, and the accuracy of fingerprint image quality judgment is low
[0004] To sum up, in the process of fingerprint collection in the prior art, due to the inaccurate determination of the start and end of fingerprint collection, it is easy to collect by mistake or mistakenly think that the machine is dead
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[0024] The specific implementation of a method and device for collecting and processing fingerprint images provided by the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0025] A method for processing and collecting fingerprint images provided by an embodiment of the present invention, such as figure 1 As shown, the method includes:
[0026] Step 102, after starting the fingerprint collection, generate a frame of fingerprint image according to the collected fingerprint;
[0027] Step 104, when it is determined that any one of the standard deviation, average gradient and spatial frequency of the frame of fingerprint image is less than the corresponding preset threshold, restart fingerprint collection until the standard deviation, average gradient and spatial frequency of the frame of fingerprint image are determined When both are greater than or equal to the corresponding preset threshold, the frame of th...
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The invention discloses an acquisition processing method of fingerprint images and a device. The method and the device are used for improving fingerprint acquisition speed, thereby avoiding a condition of mis-acquisition or mistakenly considering that a machine crashes. The method comprises steps of after starting fingerprint acquisition, generating a frame of fingerprint image according to an acquired fingerprint; when determining that any one of the standard difference, the average gradient and space frequency of the frame of fingerprint image is smaller than a corresponding preset threshold value, restarting the fingerprint acquisition, and taking the frame of fingerprint image as a to-be-judged fingerprint image until determining that the standard difference, the average gradient and space frequency of the frame of fingerprint image are larger than or equal to the corresponding preset threshold values; determining whether the to-be-judged fingerprint image is a qualified fingerprint image and finishing the fingerprint acquisition of this time after determining that the to-be-judged fingerprint image is the qualified fingerprint image; and restarting the fingerprint acquisition when determining that the to-be-judged fingerprint image is an unqualified fingerprint image.
Description
technical field [0001] The invention relates to the technical field of fingerprint image collection, in particular to a fingerprint image collection and processing method and device. Background technique [0002] In the process of fingerprint collection, there are many cases where the fingerprints of the collection objects are damaged or the persons to be collected do not cooperate, which greatly affects the results of fingerprint collection. The determination of the start and end of fingerprint collection is inaccurate, and it is easy to collect by mistake or mistakenly think that the machine is crashed, and the fingerprint integrity of the person whose fingerprint is damaged is insufficient, lacking feature points, and it is easy to fail to collect due to unqualified fingerprint image quality judgment. [0003] After the fingerprint image is collected, in the process of judging the quality of the fingerprint image, the size of the fingers is not the same. Simply distinguis...
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IPC IPC(8): G06K9/00
CPCG06V40/13
Inventor 于智欣
Owner 方正国际软件(北京)有限公司
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