CN1178956A - Full image scanning device and method - Google Patents
Full image scanning device and method Download PDFInfo
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- CN1178956A CN1178956A CN 96113065 CN96113065A CN1178956A CN 1178956 A CN1178956 A CN 1178956A CN 96113065 CN96113065 CN 96113065 CN 96113065 A CN96113065 A CN 96113065A CN 1178956 A CN1178956 A CN 1178956A
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Abstract
One transparent medium is utilized to provide one scanning plane, and the scanning plane is then scanned by one scanner to obtain image, which is stored in memory. During the imaging course, 3D image data are obtained in time order. The processor compares the grey values of identical pixels obtained successively, replaces lower grey values for originally stored ones to update stored image data. In this way, full image trace data as image obtaining result are obtained and full image scanning is completed.
Description
The present invention relates to a kind of full figure image-taking device and method, particularly a kind of full image scanning device and method.The invention provides a kind of three dimensions device of image scanning and method, be particularly suitable for fingerprint is made full finger scan.
For the image with three dimensions external form, only to have the image-taking device capture of two-dimentional capture function, the input computer system is handled, and is the method for using always on industry at present.Present visible image-taking device, for example scanner, CCD camera, because only tool is to two dimension (plane) image function of carrying out capture, as the object capture of desire to tool three dimensions external form, then must be in the capture process, adjust the focal length of amasthenic lens, carry out continuous capture, this equipment cost costliness, control is complicated, and the image after capture need be reduced into original image data and handle very time-consuming through complex calculations.
With the example that is input as of fingerprint image, the finger of human body is the object with three-dimensional space external form.Tradition capture mode is to utilize a finger-print card, is stained with printing ink for the finger of desiring capture, and by being pressed in finger-print card, and the order finger rotates, and to stay the track of fingerprint process on finger-print card, obtains the image of full fingerprint thus.The full fingerprint image of transfer printing on finger-print card can place on the image scanner, and after scanner scans, the input computer apparatus is for processing.
But, in the process of carrying out this kind capture, must prepare special finger-print card and printing ink, capture at any time.And during capture the finger must be stained with sticking printing ink, pollute and not soon the sensation.Moreover because of the technical matters of using printing ink and pushing, the fingerprint image of obtaining very easily results from stain, is stained with noises such as sticking, is unfavorable for subsequent treatment.
Utilize the CCD camera capture at present, when capture, utilize a transparent light guide structure base board (for example glass plate), order is desired the finger presses of capture and is rotated on transparency carrier, and, also can obtain the continuous pictures of the full fingerprint image of representative by the mode capture of the CCD camera that is positioned at the transparency carrier opposite side with continuous shooting.But, the continuous pictures of obtaining thus, its filming frequency generally all are controlled at about per second 30 width of cloth pictures.In 2 seconds capture time, approximately obtain 60 pictures.If every picture is of a size of 512 * 480 pixels (pixels), each pixel is that 256 gray levels (with 8 representatives) then obtain each picture need 240k space, needs the 14M storage space at least and obtain 60 black and white fingerprint pictures.
When reduction, these pictures draw the track that fingerprint occurs, as full fingerprint image data again according to set rule computing.Certainly, when the full fingerprint image of picked-up, do not need with two-forty capture like this.Generally speaking, per second 2 width of cloth pictures are suitable speed.Each picked-up 10 width of cloth pictures are promptly applicable.Under background, computer approximately needs 10 * 240k=2.4M storage space, is that the processor (for example 486DX2-66 CPU) of 66MHz is handled with speed, needs 1.3 seconds approximately.In addition, because the reduction computing is numerous and diverse, the formula design is difficult for.Therefore this system can't do to handle in real time to full finger print imaging.Simultaneously, in the reason, can not see the change of fingerprint track simultaneously herein.
Therefore need a kind of full image scanning device and method at present, can scan immediately three-dimensional image.Simultaneously also a kind of full image scanning device need be arranged, can utilize the processing of simplification, shorten the scan process required time.
The object of the present invention is to provide a kind of full image scanning device and method,, improve processing speed to simplify three dimensions image view finding method.
Purpose of the present invention also is to provide a kind of full figure scanning rule of novelty, to realize the instant capture of three dimensions object.
According to full image scanning device of the present invention and method, utilize a transparent medium that the one scan plane is provided, scan this plane of scanning motion capture with a flat scanning device, and the image data of obtaining is stored in storer.In the capture process, representing three-dimensional image data is to obtain its composition according to time sequencing.The gray-scale value of the co-located pixel of the adjacent image that the treating apparatus comparison obtained in continuous time replaces the grey scale pixel value of the image data of former storage with lower gray-scale value, and upgrades this video data storing.Can obtain the result of the track data of total image thus, and finish full figure scanning as capture.
Above-mentioned and other purpose of the present invention and advantage, can be by following explanation and with reference to following accompanying drawing and more apparent clear:
The 1st figure represents the system diagram of full image scanning device of the present invention.
The 2nd figure shows the scanning mechanism synoptic diagram of another embodiment of the present invention.
The 3rd figure represents the process flow diagram of full figure scan method of the present invention.
The 4th figure promptly represents first page of fingerprint image data obtaining with full figure scan method of the present invention.
The 5th figure promptly represents second page of fingerprint image data obtaining with full figure scan method of the present invention.
After the 6th figure represents the previous image data and the image data of new capture made comparisons, upgrade the result of this previous image data.
The 7th figure represents image sensor after obtaining the 5th figure image, the new image data that other obtains.
The 8th figure then represents the result after the image data according to the 8th figure upgrades the image of the 7th figure.
Following embodiment according to description of drawings full image scanning device of the present invention and method.
Fig. 1 is the system diagram of expression full image scanning device of the present invention and square law device.As shown in the figure, full image scanning device of the present invention and method be utilize a transparent medium (1) that one scan plane (1a) is provided and with a flat scanning device (2) to this plane of scanning motion capture.This flat scanning device (2) has a light source (21), (1a) emits beam to this plane of scanning motion, one amasthenic lens (22) will be concentrated at the light that this plane of scanning motion (1a) reflects, is loaded with scan-image information, and the scanning ray downstream of this amasthenic lens (22) is a group image sensor (23).This image sensor (23) can be one group of charge coupled cell (CCD) array, or winding touch image sensor (ContactImage Sensor-CIS) array.As utilize the contact-type image sensing device, then camera lens (22) can use selfoc lens array (Selfoc Lens Array).This flat scanning device (2) is with the frequency capture of 2 pages of per seconds, and within the storer (3) with one page image input computer of obtaining.
In full image scanning device of the present invention and another embodiment of method, be to utilize a prism that the one scan plane is provided.Fig. 2 shows the scanning mechanism synoptic diagram of another embodiment of the present invention.Among the figure,, all be marked with identical numbering with the 1st figure components identical.As shown in Figure 2, the light that light source (21) sends proceeds to the plane of scanning motion (42) through refraction after entering prism (4).Because of the characteristic of prism forms total reflection at the plane of scanning motion (42), enter camera lens (22) and leave prism (4) through refraction.When pushing this plane of scanning motion (42) with objects such as fingers, the fingerprint of finger partly (protrudes partly) total reflection that will destroy this plane of scanning motion (42), reduces the brightness of this part.Therefore, at the light that image sensor (23) is sensed, represent fingerprint partly will have lower brightness.Write down the low information partly of this brightness, can obtain the fingerprint image data.
Be example still below, the method for full image scanning device of the present invention and method capture is described with the finger print imaging.
Fig. 3 represents the process flow diagram of full image scanning device of the present invention and method view finding method.When capture, at first start light source (21) and emit beam to the plane of scanning motion (1a) or (42) in (101) step.User's finger is pushed and is rotated at the plane of scanning motion (1a) or (42) in (102) step, and simultaneously, in (103) step, image sensor (23) is with the frequency capture of per second 2 pictures.What obtain is the image of a succession of finger movement.
After image sensor (23) obtains one page scan-image, promptly obtained fingerprint image data is stored in the storer (3) in (104) step.Stored image data is to be a gray scale image data, wherein, is that 256 rank are example with gray scale, makes the complete black brightness of 0 expression, the complete white brightness of 255 expressions, the brightness of 150 expression grey.The 4th figure promptly represents one page fingerprint image data of so obtaining.
In (105) step, the user points continuous rotation, and image sensor (23) obtains second page of fingerprint image (shown in the 5th figure) once again.At this moment, treating apparatus (5) is in (106) step gray level of the previous image data in the storeies (3) and the image data of capture newly relatively, and the minimum value of the gray scale of the pixel of same position is stored in this storer (3) in (107) go on foot two pages of fingerprint image datas, and upgrading this previous image data, its result is shown in the 6th figure.
In (108) step, treating apparatus (5) judges whether capture finishes, and as not, the step of then getting back to (105), and the step of repetition (105) to (107) finish up to capture.The 8th figure represents image sensor (23) after obtaining the 5th figure image, and the new image data that other obtains, the 8th figure are then represented the result after the image data according to the 7th figure upgrades the image of the 6th figure.
After treating apparatus (5) is judged as the capture end, promptly go on foot output after the image data that upgrades in (109).The track that this finger print stayed at the plane of scanning motion when this image data was represented capture.
Utilize method of the present invention to handle ten pictures, required storage space is 2 * 240k=480k, only takes about 1.1 seconds.And it is handled system and handles continuously, can handle in real time in the process of the full fingerprint of scanning, and the user can see capture result and quality on the computer screen, exempts the intact shortcoming of still needing and waiting for of conventional equipment capture.
As mentioned above, full image scanning device of the present invention and method are utilized novel design, can be in the capture action, finish the operation of record fingerprint track, need be as prior art, must after capture, again a large amount of fingerprint image datas of obtaining be handled, improve treatment effeciency greatly.The user pushes and finishes, and can obtain required full fingerprint image.Moreover, owing to utilize above-mentioned capture rule, need not use the mass memory device to store all image datas yet, more can reduce installation cost greatly.
In addition, though embodiments of the invention with fingerprint example as an illustration, this image-taking device and method can be applied to the capture of various smooth body images, this is self-evident.
It more than is explanation to full image scanning device of the present invention and method embodiment, skilled person in the present technique field is not difficult to understand spirit of the present invention by above-mentioned explanation, and then make different spreading out and stretch and variation, but only otherwise exceed spirit of the present invention, all should be contained within the scope of its claim.
Claims (7)
1. full image scanning device comprises:
The one scan plane device is being an essence plane with scanned surface conversion;
One flat scanning device carries out optical scanning continuously with the plane of scanning motion that these plane of scanning motion means are provided, and the gained image data is transformed into the numerical digit form; And
One treating apparatus with the digital image data combination in addition with all previous output of this flat scanning device, and is exported its result; It is characterized in that the digital image data of this flat scanning device output comprises the gray-scale value of each pixel of one scan image data; And the gray-scale value of representative same address pixel in these treating apparatus more at least two continuous sweep image datas, and with representative than the grayness value of dull gray colourity grayness value as this pixel.
2. full image scanning device according to claim 1, plane of scanning motion device wherein comprises a transparent medium.
3. as full image scanning device as described in the claim 2, transparent medium wherein comprises a prism.
4. full image scanning device according to claim 1, flat scanning device wherein comprises: a light source, in order to one scanning light beam to be provided; One group image sensor array, send in order to this light source of sensing, in the shading value of the light of this plane of scanning motion reflection, export a signal; One camera lens, will be concentrated to the sensing face of this image sensor array by the light of this plane of scanning motion reflection, an analog to digital converter changes digital form into the signal of video signal with this image sensing output; And a counter, in order to counting the running time of this image sensor array, and send a signal.
5. as full image scanning device as described in the claim 4, image sensor arrays wherein is a charge coupling component array.
6. full image scanning device as claimed in claim 4, image sensor arrays wherein are a contact-type image sensing device, and this camera lens be one group from the focus lens array.
7. full image scanning device as claimed in claim 1, wherein the processing of this treating apparatus comprises:
Obtain the image data of single pass;
Export this image data;
Obtain the single pass image data;
Relatively represent gray-scale value in the rescan image data with the address pixel;
Image data with single pass before representing the darker gray-scale value of gray scale to write;
Export this image data; And
Repeat to obtain the image data of single pass, relatively reach the step that writes, up to EO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96113065 CN1093297C (en) | 1996-10-08 | 1996-10-08 | Full image scanning device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 96113065 CN1093297C (en) | 1996-10-08 | 1996-10-08 | Full image scanning device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1178956A true CN1178956A (en) | 1998-04-15 |
| CN1093297C CN1093297C (en) | 2002-10-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 96113065 Expired - Lifetime CN1093297C (en) | 1996-10-08 | 1996-10-08 | Full image scanning device and method |
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| Country | Link |
|---|---|
| CN (1) | CN1093297C (en) |
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1996
- 1996-10-08 CN CN 96113065 patent/CN1093297C/en not_active Expired - Lifetime
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| Publication number | Publication date |
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| CN1093297C (en) | 2002-10-23 |
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