A kind of fingers and palms line Acquisition Instrument and acquisition method thereof
Technical field
The present invention relates to a kind of Acquisition Instrument, especially a kind of fingers and palms line Acquisition Instrument and acquisition method thereof.
Background technology
The police must satisfy<GA/T 864-2010 with live body palmmprint Acquisition Instrument〉standard, the dimensional requirement of its acquisition window is greater than 118.9mm * 183.9mm, and image pixel number requires greater than 2304 * 3584, and picking rate is greater than 2 frame/seconds.Acquisition Instrument is connected with PC by USB 2.0 high-speed interfaces or gigabit ethernet interface.Require actually on the PC to see that the image acquisition frequency that obtains is greater than 2 frame/seconds.Yet,, make for 2 frame/seconds to be difficult to collect desirable image by the image seen on the PC and asynchronous by the action of collection staff because acquisition target is the live body palmmprint.
Summary of the invention
Primary and foremost purpose of the present invention is to provide a kind of image of being gathered and synchronous fingers and palms line Acquisition Instrument of being gathered of gesture can realized.
For achieving the above object, the present invention has adopted following technical scheme: a kind of fingers and palms line Acquisition Instrument, comprise local high speed processor, the signal input part of local high speed processor links to each other with imageing sensor, the signal output part of local high speed processor links to each other with local high-speed memory with local display screen respectively, and the signal output part of described local high speed processor links to each other with local display screen by the low speed transmissions line.
The invention also discloses a kind of acquisition method of fingers and palms line Acquisition Instrument, this method comprises the step of following order:
(1) will need the finger position of gathering or palm position by on fingers and palms line Acquisition Instrument, local high speed processor obtains high-definition picture from imageing sensor;
(2) local high speed processor is processed into low-resolution image with above-mentioned high-definition picture, and is sent to local display screen;
(3) picture quality of local display screen preview low-resolution image, press when gathering button, local high speed processor stops images acquired, and will press and gather all palmmprint picture-storage of being collected in the duration at least 1 second before the button in local high-speed memory.
As shown from the above technical solution, the present invention can provide the gatherer process preview function, and institute's images acquired is extracted low-resolution image by local high speed processor and shown on local display screen or PC, by the picture quality of local display screen or PC preview collection.According to the images acquired of preview, choose the imaging effect better image again, store, improved the quality that the fingers and palms print image is gathered, realized image of being gathered and the synchronous purpose of gesture of being gathered.
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Description of drawings
Fig. 1 is a circuit block diagram of the present invention;
Fig. 2 is collecting flowchart figure of the present invention.
Embodiment
A kind of fingers and palms line Acquisition Instrument, comprise local high speed processor 2, the signal input part of local high speed processor 2 links to each other with imageing sensor, the signal output part of local high speed processor 2 links to each other with local high-speed memory 5 with local display screen 3 respectively, the signal output part of described local high speed processor 2 links to each other with local display screen 3 by the low speed transmissions line, as shown in Figure 1.
As shown in Figure 1, described imageing sensor adopts cmos image sensor 1, cmos image sensor 1 links to each other by the signal input part of high-speed transmission line with local high speed processor 2, described local high speed processor 2 links to each other with local high-speed memory 5 by high-speed transmission line, and described local high speed processor 2 is by low speed transmissions line and PC 4 communications.
As shown in Figure 1, 2, when gathering, at first, finger position or palm position that needs are gathered are pressed on fingers and palms line Acquisition Instrument, local high speed processor 2 obtains high-definition picture from imageing sensor; Secondly, local high speed processor 2 is processed into low-resolution image with above-mentioned high-definition picture, and is sent to local display screen 3; At last, the picture quality of local display screen 3 preview low-resolution images, press when gathering button, local high speed processor 2 stops images acquired, and will press and gather all palmmprint picture-storage of being collected in the duration at least 1 second before the button in local high-speed memory 5.
When the finger position that will need to gather or palm position by on fingers and palms line Acquisition Instrument the time, local high speed processor 2 is with the speed more than per second 10 frames, obtain high-definition picture from cmos image sensor 1, local high speed processor 2 is processed into low-resolution image with described high-definition picture, is sent to the low pixel image of preview on PC 4 and the local display screen 3 with identical frame frequency by the low speed transmissions line.The low-resolution image of handling through local high speed processor 2 is corresponding one by one with high-definition picture in being kept at local high-speed memory 5.
The frequency of image update makes it synchronous with the described people's gesture of being gathered greater than 10 frame/seconds of per second.And, preserved the above up-to-date low-resolution image of 10 frames on the PC 4.On PC 4, can browse all images, select a image the most satisfied, select satisfied image and then gather end, otherwise gather again.Behind select low-resolution image on the PC 4, can obtain the high-definition picture corresponding from local high-speed memory 5 with described low resolution.