CN106454160A - Sine wave frequency coding excitation imaging system for increasing preset level through linear array CCD - Google Patents
Sine wave frequency coding excitation imaging system for increasing preset level through linear array CCD Download PDFInfo
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- CN106454160A CN106454160A CN201610915237.1A CN201610915237A CN106454160A CN 106454160 A CN106454160 A CN 106454160A CN 201610915237 A CN201610915237 A CN 201610915237A CN 106454160 A CN106454160 A CN 106454160A
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- Prior art keywords
- sine wave
- array ccd
- line array
- monochromater
- predetermined level
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/70—SSIS architectures; Circuits associated therewith
- H04N25/71—Charge-coupled device [CCD] sensors; Charge-transfer registers specially adapted for CCD sensors
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/81—Camera processing pipelines; Components thereof for suppressing or minimising disturbance in the image signal generation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
Abstract
The invention discloses a sine wave frequency coding excitation imaging system for increasing a preset level through a linear array CCD, and the system comprises single-color light sources which employ sine waves with an increased preset level at different frequencies to respectively drive one single-color light source. An i-th pixel in the linear array CCD receives a combination of single-color light, passing through a sample, of each light source. In a process that the linear array CCD collects an image, the noise level does not change, but the noise of a low level part of a sine wave signal serving as the drive is improved remarkably because of the increasing of the preset level, thereby improving the signal to noise ratio of an image obtained by the linear array CCD at the lower level segment of the sine wave signal, and improving the precision of the single-color light combination inputted into a computer. The computer carries out the demodulation and separation of the single-color light combination, obtains the contribution of each single-color light source to the single-color light combination, and can carry out the imaging of the sample based on the above.
Description
Technical field
The present invention relates to the sine wave freuqency that predetermined level is raised in imaging system field, more particularly to a kind of line array CCD is compiled
Code excited imaging system.
Background technology
By light, interior of articles is imaged in prior art, particularly inside of human body is imaged, with lossless
The outstanding advantages that noinvasive is radiationless, but not yet have the imaging light measurement system that can enter Clinical practice so far, its reason is
Existing imaging light measurement system precision is low, quantity of information is less, it is impossible to meet the needs in practical application.
In order to improve image measurement quality, it is 2015 CN 104807823A, the day for announcing that notification number of the prior art is
The patent application in July 29 improves image quality by the use of sine wave as pumping signal.
Inventor has found at least to suffer from the drawback that in above-mentioned prior art and not enough during the present invention is realized：
As existing imaging system is bar none all using analog-digital converter, analog-digital converter is near input limits
When (maximum or minimum amplitude), presence is significantly non-linear, and the analog signal level of particularly input analog-to-digital converter is lower, obtains
The uncertainty of the digital conversion results for arriving is bigger.
Therefore, during using pure sine wave as pumping signal, in the digital signal that the low level part of sine wave obtains
Signal to noise ratio just very low, so as to have impact on the overall signal to noise ratio of image.
Content of the invention
In order to improve the deficiencies in the prior art, the invention provides a kind of line array CCD raises the sinusoidal wave frequency of predetermined level
Rate coded-excitation imaging systems system, present invention achieves high speed, the high-acruracy survey of the imaging of big information, meet actual answering
With in needs, described below：
A kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, and the imaging system includes：
One group of n monochromater, line array CCD, and the computer external with line array CCD, are uniformly distributed in the side of sample
N monochromater of one group of preset wavelength, offside corresponds to monochromater and arranges line array CCD；
Predetermined level sine wave is raised using different frequency and drives each monochromater in one group of monochromater, line respectively
In battle array CCD, ith pixel receives each light source in monochromater and combines through the monochromatic light of sample；
During line array CCD collection image, noise level does not change, but as the sine wave signal for driving
Due to having raised predetermined level, in the low level part of sine wave signal, sine wave signal is obvious compared to noise improvement, so as to
Improve in sine wave signal low level section, line array CCD gets the signal to noise ratio of image, and then improve and be input in computer
Monochromatic light combination precision；
Computer is demodulated, to monochromatic light combination, the contribution that each monochromater isolated is combined to monochromatic light, accordingly
Can be to imaging of samples.
Wherein, as the sine wave signal for driving due to having raised predetermined level, in the high level part of sine wave signal,
Improve the signal to noise ratio that line array CCD gets image.
Wherein, more than half is optimal for the dynamic range of images that the value of predetermined level is gathered for line array CCD.
Wherein, the monochromater is square is uniformly distributed.
Wherein, the monochromater is laser diode.
Another embodiment, the monochromater is monochrome photodiode.
Another embodiment, the monochromater is for monochromatic filter plate to the filtered monochromatic light of white light.
The beneficial effect of technical scheme that the present invention is provided is：The present invention adopts different frequency sine wave drive monochromatic light
Source, the monochromatic light combination detected by line array CCD is demodulated separation and can obtain tribute of each monochromater to line array CCD
Offer, accordingly high precision image reconstruction is carried out to sample.It is CN 104807823A, to announce compared to the notification number in background technology
Day is the patent application in July 29 in 2015, invention significantly increases the noise of the image in sine wave signal low level section
Than improving the quality that line array CCD gets image；And then the precision that the monochromatic light being input in computer is combined is improve,
Computer is demodulated separation to monochromatic light combination and can obtain the contribution that each monochromater is combined to monochromatic light, permissible accordingly
To imaging of samples.Present invention achieves at high speed, the high-acruracy survey of big information, and with structure and circuit be simple, device
Part and technological requirement are low, debugging is easy, high reliability.
Description of the drawings
Fig. 1 raises the sine wave freuqency coded-excitation imaging systems system of predetermined level for a kind of line array CCD that the present invention is provided
Structural representation；
Monochromater, sample and line array CCD relative position schematic diagram that Fig. 2 is provided for the present invention；
Fig. 3 is the schematic diagram of the sine wave for raising predetermined level.
In accompanying drawing, the list of parts representated by each label is as follows：
1：Monochromater； 2：Sample；
3：Line array CCD.
Specific embodiment
For making the object, technical solutions and advantages of the present invention clearer, below embodiment of the present invention is made further
Ground is described in detail.
Embodiment 1
A kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, referring to Fig. 1, Fig. 2 and Fig. 3,
The imaging system includes：One group of n monochromater 1 (being represented with LD) and line array CCD 3, a n >=3 and (n is strange for odd number
Number, then most middle light source or light-sensitive device can be easy to be directed at arrangement, wherein, the concrete value of n and sample 2 as center line
Cross-sectional area correlation, the embodiment of the present invention is without limitation).In the side of sample 2, one group of preset wavelength is uniformly distributed
N monochromater 1, offside corresponds to monochromater 1 and arranges line array CCD 3, and monochromater 1 and line array CCD 3 are close to sample 2 and are pacified
Dress.
Wherein, the imaging light measurement system also includes the computer (not shown) external with line array CCD 3.
Predetermined level sine wave is raised using different frequency and drives each monochromater in one group of monochromater 1 respectively
LDj, in line array CCD 3, ith pixel receives each light source in monochromater 1 and combines I through the monochromatic light of sample 2i.
After the embodiment of the present invention raises predetermined level, during linear array CCD3 collection image, noise level is not sent out
Changing, but as the sine wave signal for driving due to having raised predetermined level, in the low level part of sine wave signal, sinusoidal
Ripple signal improves substantially, so as to improve the signal to noise ratio of the image in sine wave signal low level section compared to noise；Compared to
Notification number in background technology is CN 104807823A, and the day for announcing is July 29 in 2015 using pure sine wave as pumping signal
Patent application, the embodiment of the present invention considerably improves the signal to noise ratio of the image in sine wave signal low level section, Jin Ergai
It has been apt to the quality that line array CCD 3 gets image.
Further, since raising predetermined level, noise level is not changed in, in the high level part of sine wave signal, sinusoidal
Ripple signal is also had some improvement compared to noise, improves the signal to noise ratio of the image in sine wave signal high level section.
Further, (in the image that wherein, line array CCD 3 is received, each pixel is the image for being got due to line array CCD 3
Each monochromater through sample 2 monochromatic light combine) signal to noise ratio integrally strengthen so that the monochromatic light being input in computer
Combination has higher precision.
Wherein, the dynamic range of images that the preferred line array CCD 3 of the value of predetermined level is gathered more than half when, signal is more than
Equal to 1/2 dynamic range of images, the distortion of the signal for being collected by line array CCD 3 is little, picture quality is high.
Computer combines I to monochromatic lightiIt is demodulated separation and can obtains each monochromater LDjI is combined to monochromatic lighti
Contribution, sample 2 can be imaged accordingly.
That is, the light intensity for being received according to each pixel i in line array CCD 3, backprojection reconstruction obtains the transmission plot of sample 2
Picture, according to the organizational information in graphical analyses sample 2, determines the scattering degree information of sample tissue.The concrete operations are ability
The technology of domain maturation, the embodiment of the present invention is not repeated to this.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve just
The signal to noise ratio of the image of string ripple signal low level section, and the signal to noise ratio of image in sine wave signal high level section is also improved,
And then improve the signal noise ratio (snr) of image of whole level section so that the monochromatic light combination being input in computer has higher precision,
And then improve the quality of high-spectrum imaging, it is achieved that the imaging to sample.
Embodiment 2
A kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, and referring to Fig. 1 and Fig. 2, this is real
Illustrate as a example by example being applied using laser diode as monochromater 1.
Predetermined level sine wave is raised using different frequency and drives each laser diode in one group of monochromater 1 respectively
LDj, in line array CCD 3, each pixel i receives each laser diode in monochromater 1 and combines through the monochromatic light of sample 2
Ii, computer is to monochromatic light combination IiIt is demodulated separation and can obtains each laser diode LDjI is combined to monochromatic lightiTribute
Offer, sample 2 can be imaged accordingly.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve just
The signal to noise ratio of the image of string ripple signal low level section, and the signal to noise ratio of image in sine wave signal high level section is also improved,
And then improve the signal noise ratio (snr) of image of whole level section so that the monochromatic light combination being input in computer has higher precision,
And then improve the quality of high-spectrum imaging, it is achieved that the imaging to sample.
Embodiment 3
A kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, and referring to Fig. 1 and Fig. 2, this is real
Illustrate as a example by example being applied using monochrome photodiode as monochromater 1.
Predetermined level sine wave is raised using different frequency and drives each monochrome photodiode in one group of monochromater 1 respectively
LDj, in line array CCD 3, each pixel i receives each monochrome photodiode in monochromater 1 and combines through the monochromatic light of sample 2
Ii, computer is to monochromatic light combination IiIt is demodulated separation and can obtains each monochrome photodiode LDjI is combined to monochromatic lightiTribute
Offer, sample 2 can be imaged accordingly.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve just
The signal to noise ratio of the image of string ripple signal low level section, and the signal to noise ratio of image in sine wave signal high level section is also improved,
And then improve the signal noise ratio (snr) of image of whole level section so that the monochromatic light combination being input in computer has higher precision,
And then improve the quality of high-spectrum imaging, it is achieved that the imaging to sample.
Embodiment 4
A kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, and referring to Fig. 1 and Fig. 2, this is real
Apply example to illustrate so that monochromatic filter plate is to the filtered monochromatic light of white light as an example.
Predetermined level sine wave is raised using different frequency and drives each the monochromatic filter plate in one group of monochromater 1 respectively
Monochromatic light LD filtered to white lightj, in line array CCD 3, each pixel i receives each monochromatic light in monochromater 1 and passes through sample
The monochromatic light combination I of product 2i, computer is to monochromatic light combination IiIt is demodulated separation and can obtains each monochromatic light LDjTo monochrome
Light combines IiContribution, sample 2 can be imaged accordingly.
The embodiment of the present invention is to the model of each device in addition to specified otherwise is done, and the model of other devices is not limited,
As long as the device of above-mentioned functions can be completed.
In sum, as the embodiment of the present invention is with respect to the application documents in background technology, considerably improve just
The signal to noise ratio of the image of string ripple signal low level section, and the signal to noise ratio of image in sine wave signal high level section is also improved,
And then improve the signal noise ratio (snr) of image of whole level section so that the monochromatic light combination being input in computer has higher precision,
And then improve the quality of high-spectrum imaging, it is achieved that the imaging to sample.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the embodiments of the present invention
Sequence number is for illustration only, does not represent the quality of embodiment.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement that is made etc., should be included within the scope of the present invention.
Claims (7)
1. a kind of line array CCD raises the sine wave freuqency coded-excitation imaging systems system of predetermined level, and the imaging system includes：?
The side of sample is uniformly distributed n monochromater of one group of preset wavelength, and offside corresponds to monochromater and arranges line array CCD；With
And the computer external with line array CCD, it is characterised in that
Predetermined level sine wave is raised using different frequency and drives each monochromater in one group of monochromater, linear array respectively
In CCD, ith pixel receives each light source in monochromater and combines through the monochromatic light of sample；
Line array CCD collection image during, noise level does not change, but as driving sine wave signal due to
Predetermined level is raised, in the low level part of sine wave signal, sine wave signal improves substantially, so as to improve compared to noise
In sine wave signal low level section, line array CCD gets the signal to noise ratio of image, and then improve the list being input in computer
The precision of coloured light combination；
Computer is demodulated, to monochromatic light combination, the contribution that each monochromater isolated is combined to monochromatic light, permissible accordingly
To imaging of samples.
2. a kind of line array CCD according to claim 1 raises the sine wave freuqency coded-excitation imaging systems system of predetermined level,
Characterized in that, as the sine wave signal for driving due to having raised predetermined level, in the high level part of sine wave signal, carrying
High line array CCD gets the signal to noise ratio of image.
3. a kind of line array CCD according to claim 1 raises the sine wave freuqency coded-excitation imaging systems system of predetermined level,
Characterized in that, the dynamic range of images that gathers for line array CCD of the value of predetermined level more than half is optimal.
4. a kind of line array CCD according to claim 1 or 2 or 3 raise predetermined level sine wave freuqency code-excited become
As system, it is characterised in that the monochromater is square to be uniformly distributed.
5. a kind of line array CCD according to claim 1 or 2 or 3 raise predetermined level sine wave freuqency code-excited become
As system, it is characterised in that the monochromater is laser diode.
6. a kind of line array CCD according to claim 1 or 2 or 3 raise predetermined level sine wave freuqency code-excited become
As system, it is characterised in that the monochromater is monochrome photodiode.
7. a kind of line array CCD according to claim 1 or 2 or 3 raise predetermined level sine wave freuqency code-excited become
As system, it is characterised in that the monochromater is for monochromatic filter plate to the filtered monochromatic light of white light.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6952240B2 (en) * | 2001-05-18 | 2005-10-04 | Exar Corporation | Image sampling circuit with a blank reference combined with the video input |
| CN102231809A (en) * | 2011-05-24 | 2011-11-02 | 北京空间机电研究所 | Electronic multiplying charge coupled device (CCD) sine wave driving method |
| CN103944540A (en) * | 2014-05-08 | 2014-07-23 | 成都雷电微力科技有限公司 | Triangular wave signal generator |
| CN104807823A (en) * | 2015-04-23 | 2015-07-29 | 天津大学 | Imaging optical measurement system for position sine wave frequency encoding excitation of linear array CCD |
-
2016
- 2016-10-20 CN CN201610915237.1A patent/CN106454160A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6952240B2 (en) * | 2001-05-18 | 2005-10-04 | Exar Corporation | Image sampling circuit with a blank reference combined with the video input |
| CN102231809A (en) * | 2011-05-24 | 2011-11-02 | 北京空间机电研究所 | Electronic multiplying charge coupled device (CCD) sine wave driving method |
| CN103944540A (en) * | 2014-05-08 | 2014-07-23 | 成都雷电微力科技有限公司 | Triangular wave signal generator |
| CN104807823A (en) * | 2015-04-23 | 2015-07-29 | 天津大学 | Imaging optical measurement system for position sine wave frequency encoding excitation of linear array CCD |
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Application publication date: 20170222 |
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