CN103605955A - Image capturing apparatus based on single sensor and optical filtering - Google Patents
Image capturing apparatus based on single sensor and optical filtering Download PDFInfo
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- CN103605955A CN103605955A CN201310533639.1A CN201310533639A CN103605955A CN 103605955 A CN103605955 A CN 103605955A CN 201310533639 A CN201310533639 A CN 201310533639A CN 103605955 A CN103605955 A CN 103605955A
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Abstract
The invention relates to an image capturing apparatus based on a single sensor and optical filtering. The apparatus comprises a shell, an illuminator, an objective lens, a collimating lens, a class chessboard filtering sheet, a focusing lens, an image sensor, a connector and an image processor. The shell is a closed-type cavity structure. An internal cavity is divided into an illumination cavity and an image capturing cavity. The image capturing cavity is successively divided into an objective lens cavity, a filtering cavity, a focusing cavity and a sensor cavity by separation plates from left to right. The illuminator is arranged in the illumination cavity. The objective lens and the collimating lens are arranged in the objective lens cavity. The chessboard filtering sheet is arranged in the focusing cavity. The focusing lens is arranged in the focusing cavity. The image sensor is arranged in the sensor cavity. An output terminal of the image sensor is electrically connected with the image processor via the connector. The apparatus of the invention can use a plurality of light sources. A selected light source combination can be changed. The device can be expanded and applied in different occasions so that a requirement of an automatic iris recognition system is satisfied.
Description
Technical field
The present invention relates to a kind of iris image trap setting, particularly a kind of image capture device based on single-sensor and optically filtering.
Background technology
Bio-identification is a kind of technology by living things feature recognition personal identification.Iris, because of its uniqueness, stability and security, becomes a biometric feature the most effective gradually.Due to the efficient available and appearance of Algorithm of Iris Recognition accurately, automatic identification and verification system based on iris are more and more welcome in the past few years.Iris recognition process is divided into 6 steps substantially: gather iris picture; Picture mode conversion; The orientation and segmentation of iris inner and outer boundary; Iris standardization; The feature extraction of iris-encoding; Characteristic matching.Wherein, the orientation and segmentation of the 3rd step iris inner and outer boundary is a most important step, because the quality of this step will directly affect the capacity of Noise of iris authentication system, and finally causes the restriction to iris authentication system application.
Most iris identification methods rely on desirable iris image to realize identification accurately, such as, people must look at camera lens straight to obtain low noise iris image; Again or, adopt large complicated and expensive precision apparatus to obtain high-quality iris image.But the performance of the first iris authentication system is subject to eyelid, eyelashes, the variation of illumination, or the having a strong impact on of the interference such as plane inner rotary; The price of the second iris authentication system is too high, is unfavorable for applying of system.To the constraint of input picture, the constraint to user in process during image acquisition be must cause, thereby popularization and the application of this technology limited.
The different parts of human eye is different to the reflectivity of same spectrum.Such as, Asian iris is high to the reflectivity of the luminance factor visible ray of near infrared light, but sclera is just contrary.This is mainly to be caused by the optical property that has formed two molecules of mankind's iris pigments: brown black euchroic element (surpassing 90%) and yellowish red color element.Euchroic element is most of can capture the details of higher level like this at Visible Light fluorescence, but also obtains more noisy workpiece, comprises mirror-reflection, diffuse reflection and shade.The spectral radiance of iris changes more obvious than near infrared spectrum with regard to the level of its pigment deposition in visible spectrum.On the contrary, the spectral reflectance of sclera is much higher in visible spectrum than near infrared light.Therefore, traditional iris splitting method based on template and border is because rim detection or matching rigidity profile difficulty may failures.With different spectral illumination human eyes, obtain two different width images of gray-scale value, then this two width image is carried out to Histogram Matching, image is done poor, difference binaryzation, and Region Segmentation four steps are processed, and just can be partitioned into quickly and accurately iris portion.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of filter plate that utilizes checkerboard configuration by the spectral separation of two kinds of light sources and sends the image capture device based on single-sensor and optically filtering of sensor to.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of image capture device based on single-sensor and optically filtering, comprises shell, luminaire, object lens, collimating mirror, class chessboard filter plate, condenser lens, imageing sensor, connector and image processor;
Described shell is closed cavity structure, its internal cavities is separated into superposed illumination cavity and is positioned at the picture catching cavity of bottom, described picture catching cavity is become object lens cavity by baffle for separating from left to right successively, filtering cavity, focus on cavity and sensor cavities, in described illumination cavity, the sidewall in left side is provided with light hole, on described dividing plate, is provided with light hole;
Described luminaire is arranged at the illumination cavity inside that is positioned at object lens cavity top, the left side of described object lens cavity is provided with incidence hole, at object lens cavity inside, be disposed with from left to right object lens and collimating mirror, filtering cavity inside is provided with chessboard filter plate, described focusing cavity inside is provided with condenser lens, described sensor cavities inside is provided with imageing sensor, the focus of described object lens, the focus of collimating mirror, the center of chessboard filter plate, the focus of condenser lens is located along the same line, the light that luminaire sends is irradiated on iris through light hole, the light of iris reflex is caught by object lens through incidence hole, through collimating mirror, flatten after row, through the filtering of light hole process chessboard filter plate, condenser lens enters imageing sensor after focusing on, the output terminal of described imageing sensor is electrically connected to described image processor through connector, imageing sensor passes to image processor by this electric signal through connector after light signal is converted into electric signal.
The invention has the beneficial effects as follows: the feature that the present invention has accurately and fast, robustness is good and cost is low, use simply, to not constraint of user, have wide range of applications, can use various light sources, change the combination of light sources of selecting, can be extended to different occasions, use visible spectrum and near infrared spectrum, user does not have any discomfort sense, and algorithm is simple, and processing speed is fast, meet the requirement of automatic iris authentication system, installation cost is low.
On the basis of technique scheme, the present invention can also do following improvement.
Further, the filter plate that described chessboard filter plate is chessboard-like structure, each grid of chessboard-like structure is spaced high-pass filtering sheet or low pass filters.
Further, the filter range of described high-pass filtering sheet is 700nm～900nm.
Further, the filter range of described low pass filters is 400nm～700nm.
Further, described luminaire is the hybrid light source that visible light source and near-infrared light source form.
Further, described near-infrared light source or be medium infrared ray, far infrared, ultraviolet ray, x ray, gamma ray.
Further, described imageing sensor is ccd image sensor.
Accompanying drawing explanation
Fig. 1 is apparatus of the present invention structural drawing;
Fig. 2 is chessboard filter plate structural drawing of the present invention.
In accompanying drawing, the list of parts of each label representative is as follows:
1, shell, 2, luminaire, 3, object lens, 4, collimating mirror, 5, class chessboard filter plate, 6, condenser lens, 7, imageing sensor, 8, connector, 9, image processor.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example, only for explaining the present invention, is not intended to limit scope of the present invention.
As shown in Figure 1, be apparatus of the present invention structural drawing; Fig. 2 is chessboard filter plate structural drawing of the present invention.
An image capture device based on single-sensor and optically filtering, is characterized in that: comprise shell 1, luminaire 2, object lens 3, collimating mirror 4, class chessboard filter plate 5, condenser lens 6, imageing sensor 7, connector 8 and image processor 9;
Described shell 1 is closed cavity structure, its internal cavities is separated into superposed illumination cavity and is positioned at the picture catching cavity of bottom, described picture catching cavity is become object lens cavity by baffle for separating from left to right successively, filtering cavity, focus on cavity and sensor cavities, in described illumination cavity, the sidewall in left side is provided with light hole, on described dividing plate, is provided with light hole;
Described luminaire 2 is arranged at the illumination cavity inside that is positioned at object lens cavity top, the left side of described object lens cavity is provided with incidence hole, at object lens cavity inside, be disposed with from left to right object lens 3 and collimating mirror 4, filtering cavity inside is provided with chessboard filter plate 5, described focusing cavity inside is provided with condenser lens 6, described sensor cavities inside is provided with imageing sensor 7, the focus of described object lens 3, the focus of collimating mirror 4, the center of chessboard filter plate 5, the focus of condenser lens 6 is located along the same line, the light that luminaire sends is irradiated on iris through light hole, the light of iris reflex is caught by object lens 3 through incidence hole, through collimating mirror 4, flatten after row, through 5 filtering of light hole process chessboard filter plate, after focusing on, condenser lens 6 enters imageing sensor 7, the output terminal of described imageing sensor 7 is electrically connected to described image processor 9 through connector 8, imageing sensor passes to image processor by this electric signal through connector after light signal is converted into electric signal.
The filter plate that described chessboard filter plate 5 is chessboard-like structure, each grid of chessboard-like structure is spaced high-pass filtering sheet or low pass filters.
The filter range of described high-pass filtering sheet is 700nm～900nm.The filter range of described low pass filters is 400nm～700nm.Described luminaire 2 is the hybrid light source that visible light source and near-infrared light source form.
Described near-infrared light source or be medium infrared ray, far infrared, ultraviolet ray, x ray, gamma ray.Described imageing sensor is ccd image sensor.
The present invention only needs the optically filtering sheet of an imageing sensor and particular design.But imageing sensor 9 will have good pixel homogeneity, it needs neighborhood pixels or one group of neighbor to have identical optical sensitivity, so need to use charge-coupled device (CCD) rather than complementary metal oxide semiconductor (CMOS) (CMOS) sensor.
The light wave that luminaire 2 sends is the mixed light of near infrared light and visible ray, and the illuminated device 2 of iris illuminates, and then by object lens 3, is caught, and light is collimated the row that flattens after mirror 4 is aimed at.This parallel beam is then by specially designed filter plate 5, and light beam becomes by near infrared light beam and can be by light beam special light beam alternately, and this special light beam is focused lens 6 and focuses on imageing sensor 7 surfaces, and imageing sensor 7 catches images; Connector 8 is passed to image processor 9 by image, and image processor 9 obtains two width images by image packets reconstruct, then two width images are carried out to Histogram Matching, and image is done poor, difference binaryzation, the processing such as Region Segmentation.
The shape that chessboard filter plate 5 is similar chessboard.The filtering characteristic of each grid is different.Such as, inner for the grid of circular pattern is low pass filters, and inside for the grid of grid be high-pass filtering sheet.The structure of this alternative arrangement has guaranteed the reconstruct of image, and the filter plate of infering arrangement is small-sized, so with regard to picture material, be almost living.All light by black grid is for building the image under visible ray, and the light of the light grid of process is for building the image under near infrared light.
The method is well-adapted to the iris under mobile status (IOM) and distant range iris (IID) system (picture noise that these two kinds of systems obtain is many, and distortion is serious).The hand-held iris identification equipment using in the urgent battlefield of condition extreme situation, it is very important quick and precisely obtaining iris information.The method has very large advantage equally to such equipment.
Utilize image capture device as claimed in claim 1 to extract a method for iris boundary, eyelashes and hot spot, comprise the following steps:
Step 1: when the luminaire in image capture device 2 is set to near-infrared light source and visible light source, utilize the imageing sensor 7 in image capture device to gather eye image, obtain visible ray eye image and near infrared eye image;
Step 2: respectively visible ray eye image and near infrared eye image are done to Histogram Matching processing, obtain visible ray matching image and near infrared light matching image;
Step 3: calculate the pixel value difference of the pixel of same position in visible ray matching image and near infrared light matching image, obtain error image;
Step 4: error image is carried out to binary conversion treatment, obtain bianry image;
Step 5: the difference according to pixel value is cut apart bianry image, obtains iris region image, eyelashes image and light spot image.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. the image capture device based on single-sensor and optically filtering, it is characterized in that: comprise shell (1), luminaire (2), object lens (3), collimating mirror (4), class chessboard filter plate (5), condenser lens (6), imageing sensor (7), connector (8) and image processor (9);
Described shell (1) is closed cavity structure, its internal cavities is separated into superposed illumination cavity and is positioned at the picture catching cavity of bottom, described picture catching cavity is become object lens cavity by baffle for separating from left to right successively, filtering cavity, focus on cavity and sensor cavities, in described illumination cavity, the sidewall in left side is provided with light hole, on described dividing plate, is provided with light hole;
Described luminaire (2) is arranged at the illumination cavity inside that is positioned at object lens cavity top, the left side of described object lens cavity is provided with incidence hole, at object lens cavity inside, be disposed with from left to right object lens (3) and collimating mirror (4), filtering cavity inside is provided with chessboard filter plate (5), described focusing cavity inside is provided with condenser lens (6), described sensor cavities inside is provided with imageing sensor (7), the focus of described object lens (3), the focus of collimating mirror (4), the center of chessboard filter plate (5), the focus of condenser lens (6) is located along the same line, the light that luminaire sends is irradiated on iris through light hole, the light of iris reflex is caught by object lens (3) through incidence hole, through collimating mirror (4), flatten after row, through the filtering of light hole process chessboard filter plate (5), condenser lens (6) enters imageing sensor (7) after focusing on, the output terminal of described imageing sensor (7) is electrically connected to described image processor (9) through connector (8), imageing sensor (7) passes to image processor (9) by this electric signal through connector (8) after light signal is converted into electric signal.
2. the image capture device based on single-sensor and optically filtering according to claim 1, it is characterized in that: described chessboard filter plate (5) is the filter plate of chessboard-like structure, each grid of chessboard-like structure is spaced high-pass filtering sheet or low pass filters.
3. the image capture device based on single-sensor and optically filtering according to claim 2, is characterized in that: the filter range of described high-pass filtering sheet is 700nm～900nm.
4. the image capture device based on single-sensor and optically filtering according to claim 2, is characterized in that: the filter range of described low pass filters is 400nm～700nm.
5. according to the arbitrary described image capture device based on single-sensor and optically filtering of claim 1 to 4, it is characterized in that: described luminaire (2) is the hybrid light source of visible light source and near-infrared light source composition.
6. the image capture device based on single-sensor and optically filtering according to claim 5, is characterized in that: described near-infrared light source or be medium infrared ray, far infrared, ultraviolet ray, x ray, gamma ray.
7. the image capture device based on single-sensor and optically filtering according to claim 5, is characterized in that: described imageing sensor is ccd image sensor.
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| CN201310533639.1A CN103605955A (en) | 2013-11-01 | 2013-11-01 | Image capturing apparatus based on single sensor and optical filtering |
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| CN201310533639.1A CN103605955A (en) | 2013-11-01 | 2013-11-01 | Image capturing apparatus based on single sensor and optical filtering |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2021114963A1 (en) * | 2019-12-11 | 2021-06-17 | Hsieh Chi Sheng | System for observing nocturnal activities and temperature variation of living target during daytime |
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| CN101650774A (en) * | 2008-08-17 | 2010-02-17 | 宫雅卓 | Method and device for acquiring handheld iris images |
| CN102006819A (en) * | 2008-03-27 | 2011-04-06 | 纽罗皮特克斯公司 | Ocular imaging |
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| CN101309360A (en) * | 2007-05-17 | 2008-11-19 | 索尼株式会社 | Video input processor, imaging signal-processing circuit, and method for reducing noises in imaging signals |
| CN102006819A (en) * | 2008-03-27 | 2011-04-06 | 纽罗皮特克斯公司 | Ocular imaging |
| CN101650774A (en) * | 2008-08-17 | 2010-02-17 | 宫雅卓 | Method and device for acquiring handheld iris images |
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Application publication date: 20140226 |