CN102821254B - Pre-amplifying processing circuit of charge coupled device (CCD) image signals obtained under X-rays - Google Patents
Pre-amplifying processing circuit of charge coupled device (CCD) image signals obtained under X-rays Download PDFInfo
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Abstract
The invention provides a pre-amplifying processing circuit of CCD image signals obtained under X-rays. The circuit is characterized by comprising a low pass filter, an amplifier and an upper amplitude limiter, wherein the low pass filter is used for performing low pass filtering to the input of CCD image signals obtained under X-rays to generate first signals, the amplifier is connected with the low pass filter and used for amplifying the first signals to generate second signals, and the upper amplitude limiter is connected with the amplifier and is used for performing upper amplitude limiting to the second signals to generate third signals which are lower than an index value. According to an embodiment of the pre-amplifying processing circuit of CCD image signals obtained under X-rays, the CCD image signals obtained under X-rays are amplified, so that the dynamic range of an analog to digital (AD) convertor is met and the image quality is improved.
Description
Technical field
The present invention relates to a kind of pre-amplification treatment circuit, particularly a kind of pre-amplification treatment circuit of CCD (charge coupled device) picture signal for obtaining under amplifying X-ray.
Background technology
CCD chip output saturation amplitude is under visible light comparatively large, is about 2V peak-to-peak value.But when taking under X ray environment, due to the restriction of the maximum dose X ray that human body can bear, the output of ccd image signal only has 0.5V peak-to-peak value, and therefore integral image illumination is low, and picture quality is not high.In addition, because the input range of rear end AD (modulus) converter sampling chip is also 0 ~ 2V, therefore waste most of dynamic range of AD converter, cause overall picture quality not high.
Summary of the invention
Object of the present invention is intended at least solve one of above-mentioned technological deficiency.
For achieving the above object, according to an aspect of the present invention, propose a kind of pre-amplification treatment circuit for ccd image signal under amplifying X-ray, it is characterized in that, comprise: low pass filter, described low pass filter is used for carrying out low-pass filtering to generate the first signal to the input of the ccd image signal obtained under X ray; Amplifier, described amplifier is connected with described low pass filter, for amplifying to generate secondary signal to described first signal; And upper limiter, described upper limiter is connected with described amplifier, for carrying out upper amplitude limit to described secondary signal to generate the 3rd signal lower than predetermined value.
According to one embodiment of present invention, the input voltage of the ccd image signal obtained under described X ray is between 0 ~ 0.5V.
According to one embodiment of present invention, the multiplication factor of described amplifier is 3 ~ 5 times.
According to one embodiment of present invention, described predetermined value is between 0 ~ 2V.
According to one embodiment of present invention, described low pass filter comprises the first resistance and the first electric capacity, wherein: one end of described first resistance is connected with the input of the ccd image signal obtained under X ray, and the other end of described first resistance is as output; Be connected with the other end of described first resistance with one end of described first electric capacity, the other end ground connection of described first electric capacity.
According to one embodiment of present invention, described amplifier is made up of the second resistance, the 3rd resistance and amplifying unit, described amplifying unit has positive receiving terminal, negative receiving terminal and output, wherein: described amplifying unit and the second resistor coupled in parallel, the positive receiving terminal of described amplifying unit is connected with described first signal, the negative receiving terminal of described amplifier is connected with the 3rd resistance, and the output of described amplifying unit exports described secondary signal, and described 3rd grounding through resistance.
According to one embodiment of present invention, described upper limiter is made up of the 4th resistance, the 5th resistance, diode and constant voltage source, wherein: the first end of the 4th resistance is connected to receive described secondary signal with the output of described amplifying unit, second end of the 4th resistance is connected to export the 3rd signal with the first end of the 5th resistance and the positive pole of diode, second end ground connection of the 5th resistance, the negative pole of diode is connected with the positive pole of constant voltage source.
According to one embodiment of present invention, the ratio of the 3rd resistance and the 4th resistance is between 2 ~ 4.
According to one embodiment of present invention, the voltage of described constant voltage source is between 1 ~ 3V.
According to a further aspect in the invention, a kind of signal processing apparatus comprising pre-amplification treatment circuit is proposed.
By this pre-amplification treatment circuit, the ccd image signal obtained under X ray is amplified, thus meet the dynamic range of rear end AD converter and improve picture quality, particularly, the ccd image signal obtained under X ray is amplified to the peak-to-peak value scope lower than 2V by pre-amplification treatment circuit, ensure that the ccd image range of signal being input to AD converter is 0 ~ 2V, thus effectively make use of the dynamic range of AD converter and improve picture quality.Meanwhile, ensure under visible light, do not exceed the input range of AD converter, thus reach the object of protection AD converter chip.
The aspect that the present invention adds and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
The present invention above-mentioned and/or additional aspect and advantage will become obvious and easy understand from the following description of the accompanying drawings of embodiments, wherein:
Fig. 1 is the pre-amplification treatment circuit schematic block diagram of ccd image signal for obtaining under X ray according to the embodiment of the present invention;
Fig. 2 is the structure chart of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray according to the embodiment of the present invention;
Fig. 3 is the structure chart of the low pass filter of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1;
Fig. 4 is the structure chart of the amplifier of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1; With
Fig. 5 is the structure chart of the upper limiter of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
The present inventor finds, by being amplified by the ccd image obtained under X ray signal, the dynamic range that both can meet rear end AD converter can also improve picture quality.Describe the pre-amplification treatment circuit of the ccd image signal for obtaining under X ray of the present invention in detail below in conjunction with accompanying drawing and there is its signal processing apparatus.
Fig. 1 is the schematic block diagram of the pre-amplification treatment circuit 100 of ccd image signal for obtaining under X ray according to the embodiment of the present invention.As shown in Figure 1, pre-amplification treatment circuit 100 comprises: low pass filter 110, amplifier 120 and upper limiter 130.The ccd image signal input obtained under usual X ray is at about 0 ~ 0.5V.The frequency of low pass filter 110 pairs of ccd image signals input carries out corresponding coupling, by rejecting short-term fluctuation, retains long-run development trend and provides the smoothed version of ccd image signal input.The ccd image signal amplifier obtained under X ray after low pass filter 110 filtering, by setting amplifier magnification ratio, amplifies by amplifier 120.In embodiments of the present invention, the multiplication factor of amplifier 120 is 3-5 times, preferably 4 times.The ccd image signal obtained under X ray after amplifier 120 amplifies is imported in upper limiter 130; upper limiter 130 is guaranteed under any light condition; the ccd image signal obtained under X ray exports all will higher than predetermined peak-to-peak value, thus protect the chip of rear end AD converter 200 to be without prejudice.In embodiments of the present invention, predetermined peak-to-peak value, between 0-2V, is preferably 2V.
According to embodiments of the invention, the ccd image signal obtained under X ray is amplified to the peak-to-peak value scope lower than 2V by pre-amplification treatment circuit, ensure that the ccd image range of signal being input to AD converter is 0 ~ 2V, thus effectively make use of the dynamic range of AD converter and improve picture quality.Meanwhile, ensure under visible light, do not exceed the input range of AD converter, thus reach the object of protection AD converter chip.
Fig. 2 is the structure chart of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray according to the embodiment of the present invention.In the embodiment depicted in figure 2, show the circuit diagram of the chief component of this pre-amplification treatment circuit, comprise three chief components: low pass filter 110, amplifier 120 and upper limiter 130.The structure of each part is described in detail below in conjunction with Fig. 3 to Fig. 5.
Fig. 3 is the structure chart of the low pass filter 110 of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1.As shown in Figure 3, low pass filter 110 is made up of resistance R1 and electric capacity C1.In one embodiment of the invention, the voltage through the ccd image signal of low pass filter 110 process is 0.5V.The output voltage V1 of low pass filter 110 is as the input voltage of amplifier 120.
Fig. 4 is the structure chart of the amplifier 120 of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1.As shown in Figure 4, amplifier 120 is made up of resistance R2, resistance R3 and amplifying unit 123, and wherein the multiplication factor of input voltage is determined by the ratio of resistance R2 and resistance R3, and amplifying unit 123 amplifies input voltage according to multiplication factor.In one embodiment of the invention, multiplication factor is (1+R3/R2).In one embodiment of the invention, amplifying unit 123 is AD 8051.In one embodiment of the invention, the resistance of R2 is 1 kilo-ohm, and the resistance of R3 is 3 kilo-ohms, and the multiplication factor of amplifier 120 is 4 times; The voltage of the ccd image signal after amplifier 120 amplifies is 2V (0.5V*4=2V).Voltage V2 after amplification is input to upper limiter 130 by amplifier 120.
Fig. 5 is the structure chart of the upper limiter 130 of the pre-amplification treatment circuit of ccd image signal for obtaining under X ray of Fig. 1.As shown in Figure 5, upper limiter 130 is made up of resistance R4, resistance R5, diode D and constant voltage source E, and in parallel with resistance R5 after wherein being connected with constant voltage source E by diode D, the circuit after parallel connection is connected with resistance R4.The voltage of constant voltage source E is 1 ~ 3V.In one embodiment of the invention, the voltage of constant voltage source E is 2V; Resistance R5 is 2.2 kilo-ohms, and resistance R4 is 100 Europe; When the voltage of V3 is higher than constant voltage source E, D conducting, the voltage that output to AD converter 200 equals constant voltage source E; When V3 is lower than E, D ends, and the voltage that output to AD converter 200 equals V3.Thus ensure that the output voltage of ccd image signal is always lower than 2V.
According to embodiments of the invention; the peak-to-peak value scope reaching 0 ~ 2V through amplifier process that the ccd image signal obtained under making X ray exports; to meet the dynamic range of rear end AD converter; ensure under any light condition by upper limiter simultaneously; the output of ccd image signal all will higher than the peak-to-peak value of the highest 2V, thus protect the chip of rear end AD converter to be without prejudice through amplifier process.
Although illustrate and describe embodiments of the invention, for the ordinary skill in the art, be appreciated that and can carry out multiple change, amendment, replacement and modification to these embodiments without departing from the principles and spirit of the present invention, scope of the present invention is by claims and equivalency thereof.
Claims (7)
1. the pre-amplification treatment circuit of ccd image signal for obtaining under X ray, is characterized in that, comprising:
Low pass filter, described low pass filter is used for carrying out low-pass filtering to generate the first signal to the input of the ccd image signal obtained under X ray;
Amplifier, described amplifier is connected with described low pass filter, for amplifying to generate secondary signal to described first signal, wherein, described amplifier is by the second resistance, 3rd resistance and amplifying unit composition, described amplifying unit has positive receiving terminal, negative receiving terminal and output, described amplifying unit and described second resistor coupled in parallel, the described positive receiving terminal of described amplifying unit is connected with described first signal, the negative receiving terminal of described amplifier is connected with described 3rd resistance, the described output of described amplifying unit exports described secondary signal, described 3rd grounding through resistance, and the ratio of described 3rd resistance and described second resistance is between 2 ~ 4, and
Upper limiter, described upper limiter is connected with described amplifier, for carrying out upper amplitude limit to described secondary signal to generate the 3rd signal lower than predetermined value, wherein, described upper limiter is by the 4th resistance, 5th resistance, diode and constant voltage source composition, the first end of described 4th resistance is connected to receive described secondary signal with the output of described amplifying unit, second end of described 4th resistance is connected to export described 3rd signal with the described first end of the 5th resistance and the positive pole of described diode, second end ground connection of described 5th resistance, the negative pole of described diode is connected with the positive pole of constant voltage source.
2. pre-amplification treatment circuit according to claim 1, is characterized in that,
The input voltage of the ccd image signal obtained under described X ray is between 0 ~ 0.5V.
3. pre-amplification treatment circuit according to claim 2, is characterized in that,
The multiplication factor of described amplifier is 3 ~ 5 times.
4. pre-amplification treatment circuit according to claim 3, is characterized in that,
Described predetermined value is between 0 ~ 2V.
5. pre-amplification treatment circuit according to any one of claim 1 to 4, is characterized in that, described low pass filter comprises the first resistance and the first electric capacity, wherein:
One end of described first resistance is connected with the input of the ccd image signal obtained under X ray, and the other end of described first resistance is as output; With
One end of described first electric capacity is connected with the other end of described first resistance, the other end ground connection of described first electric capacity.
6. pre-amplification treatment circuit according to claim 1, is characterized in that,
The voltage of described constant voltage source is between 1 ~ 3V.
7. a signal processing apparatus, is characterized in that, comprises the pre-amplification treatment circuit according to any one of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110205477.XA CN102821254B (en) | 2011-06-08 | 2011-07-21 | Pre-amplifying processing circuit of charge coupled device (CCD) image signals obtained under X-rays |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120191191.6 | 2011-06-08 | ||
| CN2011201911916 | 2011-06-08 | ||
| CN201120191191 | 2011-06-08 | ||
| CN201110205477.XA CN102821254B (en) | 2011-06-08 | 2011-07-21 | Pre-amplifying processing circuit of charge coupled device (CCD) image signals obtained under X-rays |
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| CN102821254A CN102821254A (en) | 2012-12-12 |
| CN102821254B true CN102821254B (en) | 2015-05-20 |
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| CN201110205477.XA Expired - Fee Related CN102821254B (en) | 2011-06-08 | 2011-07-21 | Pre-amplifying processing circuit of charge coupled device (CCD) image signals obtained under X-rays |
| CN201120314651XU Expired - Fee Related CN202178830U (en) | 2011-06-08 | 2011-08-25 | Amplifying device for CCD image signal |
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| CN103529232A (en) * | 2013-10-23 | 2014-01-22 | 成都市宏山科技有限公司 | Interface circuit for wheel speed sensor of motor vehicle |
| CN108537727B (en) * | 2017-03-06 | 2020-07-24 | 无锡日联科技股份有限公司 | System amplification factor high-precision algorithm for X-ray digital imaging system |
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| CN1106823C (en) * | 1997-09-02 | 2003-04-30 | 新疆维吾尔自治区阿克苏地区第二人民医院 | Non-film camera system for medical use |
| CN2481089Y (en) * | 2001-05-30 | 2002-03-06 | 徐伟 | Digitization x-ray image video collection device |
| US6486808B1 (en) * | 2001-10-16 | 2002-11-26 | Varian Medical Systems | Data signal amplifier with automatically controllable dynamic signal range |
| CN100493136C (en) * | 2005-11-30 | 2009-05-27 | 北京思比科微电子技术有限公司 | Analog-to-digital converter and controlling method thereof |
| CN101764610A (en) * | 2009-12-23 | 2010-06-30 | 中国航空工业集团公司第六三一研究所 | Hardware and software implementation method for improving digital-analog/analog-digital conversion accuracy |
| CN101779962B (en) * | 2010-01-19 | 2014-08-13 | 西安华海医疗信息技术股份有限公司 | Method for enhancing medical X-ray image display effect |
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| CN202178830U (en) | 2012-03-28 |
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Address after: 100176 Beijing City, Yizhuang economic and Technological Development Zone East Road, two by sea in Macmillan building Applicant after: BEIJING ZHONGKE MEILUN TECHNOLOGY CO.,LTD. Address before: 100176 Beijing City, Yizhuang economic and Technological Development Zone East Road, two by sea in Macmillan building Applicant before: Beijing Zhongke Meilun Technology Co.,Ltd. |
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