CN112383724A

CN112383724A - Image calibration device for cultural relic photo

Info

Publication number: CN112383724A
Application number: CN202011361754.1A
Authority: CN
Inventors: 符加林; 赵占恒; 魏蕾如; 张克一; 张志锋
Original assignee: Zhengzhou University of Light Industry
Current assignee: Zhengzhou University of Light Industry
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2021-02-19

Abstract

The invention discloses an image calibration device for a cultural relic photo, which effectively solves the problem that the cultural relic signal obtained under weak illumination in the prior art is weak and the influence of noise carried by a CCD sensor on the cultural relic signal is ignored, a signal receiving circuit of the invention firstly carries out low-pass filtering on the cultural relic signal transmitted by an amplifier, then utilizes a varactor diode D3, an inductor L1 and a capacitor C3 to filter noise waves in the cultural relic signal, utilizes a resistor R8 and a capacitor C5 to detect whether high-frequency noise exists in the cultural relic signal and transmits the cultural relic signal to a signal transmission circuit, the signal transmission circuit utilizes a resistor R10 and a resistor R9 to sample the cultural relic signal, utilizes a triode Q1 to detect whether the weak cultural relic signal exists in the sampled cultural relic signal and feeds the weak cultural relic signal back to an operational amplifier U1B for re-amplification, and utilizes a triode Q2, a capacitor B, The field effect transistor Q3 and the diode D5 output the cultural relic signal to the A/D converter.

Description

Image calibration device for cultural relic photo

Technical Field

The invention relates to the field of cultural relic photos, in particular to an image calibration device for the cultural relic photos.

Background

In order to complete accurate collection and 3D image reproduction of cultural relic photos, the cultural relic photos are generally collected by means of photographing, scanning, 3D modeling, virtual rendering, 3D platform display and the like at present, when the collection is carried out by using a photographing mode, workers generally transmit analog pulse cultural relic signals collected by a CCD sensor when illumination is strong to an A/D converter after amplifying the analog pulse cultural relic signals so as to output digital signals, so that the digital signals are convenient to transmit and finally carry out cultural relic display.

In order to provide cultural relics in various directions and states for people to appreciate, workers have to collect cultural relic photos under weak light, and the existing data and facts indicate that the cultural relics are easy to have irreversible damage under strong light, so that the cultural relic photo collection can be only carried out under the weak light.

The present invention therefore provides a new solution to this problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an image calibration device for a cultural relic photo, which effectively solves the problem that the influence of noise carried by a CCD sensor on the cultural relic signal is neglected in the prior art in order to solve the problem that the cultural relic signal obtained under weak illumination is weak.

The technical proposal for solving the problem is that the image calibration device for the cultural relic photo comprises a signal receiving circuit and a signal transmission circuit, the signal receiving circuit utilizes a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 to carry out low-pass filtering on the cultural relic signal transmitted by the amplifier, then, the varactor diode D3, the inductor L1 and the capacitor C3 are used for filtering noise waves in the cultural relic signal, the resistor R8 and the capacitor C5 are used for detecting whether high-frequency noise exists in the cultural relic signal and transmitting the cultural relic signal to the signal transmission circuit, the signal transmission circuit samples the cultural relic signal by using the resistor R10 and the resistor R9, detects whether a weak cultural relic signal exists in the sampled cultural relic signal by using the triode Q1, and the weak cultural relic signal is fed back to the operational amplifier U1B to be amplified again, and the cultural relic signal is output to the A/D converter by utilizing the triode Q2, the field effect transistor Q3 and the diode D5.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:

(1) clutter mixed in cultural relic signals is filtered through an inductor L1, a capacitor C3 and a variable capacitance diode D3 in a signal receiving circuit, noise carried by a CCD sensor in the collected cultural relic signals, such as dark current noise and reset noise, is also filtered, the cultural relic signals output by an operational amplifier U1B are detected through a high-pass filter consisting of the capacitor C5 and a resistor R8, whether high-frequency signals exist in the cultural relic signals or not is detected, if the high-frequency signals exist, the resistor R8 is conducted with the capacitor C5, the cultural relic signals are fed back to a low-pass filter consisting of the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2 to perform low-pass filtering again, and therefore a good filtering effect is achieved;

(2) the triode Q1 is arranged on the signal transmission circuit to detect the sampled cultural relic signal, when the triode Q1 is conducted, the weak illumination signal is transmitted to the in-phase end of the operational amplifier U1B in the signal receiving circuit through the resistor R5 to be amplified again, the phenomenon that the cultural relic signal under weak illumination cannot be amplified to the amplitude value of the cultural relic signal obtained under the same strong illumination because the amplification factor of the amplifier for amplifying the cultural relic signal under strong illumination is small is avoided, the cultural relic signal output by the A/D converter is not beneficial to visitors to watch, when the sampled cultural relic signal conducts the voltage stabilizing tube D2 reversely, the cultural relic signal at the moment is absorbed through the resistor R7 and the capacitor C4, and the surge phenomenon of the A/D converter is avoided.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.

Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

An image calibration device for cultural relic photos is applied between an amplifier and an A/D converter, wherein the amplifier is responsible for amplifying cultural relic signals collected by a CCD sensor and transmitting the signals to the A/D converter after the signals are processed by the image calibration device, the image calibration device comprises a signal receiving circuit and a signal transmission circuit, a diode D1 in the signal receiving circuit is used for receiving the cultural relic signals collected by the CCD sensor after the signals are amplified by the amplifier, a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 is used for filtering so as to filter high-frequency signals except low-frequency signals where the cultural relic signals are located, an inductor L1, a capacitor C3 and a varactor D3 are used for filtering clutter mixed in the cultural relic signals, and noise such as dark current noise and reset noise carried by the CCD sensor during the collection of the cultural relic signals is also filtered, the filtered cultural relic signal is transmitted to the homophase end of an operational amplifier U1B through a resistor R4 to compensate loss caused by low-pass filtering of the cultural relic signal, the cultural relic signal output by the operational amplifier U1B is detected through a high-pass filter consisting of a capacitor C5 and a resistor R8 to detect whether a high-frequency signal still remains in the cultural relic signal, if the high-frequency signal exists, a resistor R8 is conducted with a capacitor C5, the cultural relic signal is fed back to a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 to carry out low-pass filtering again, the signal transmission circuit firstly utilizes a resistor R10 to receive the cultural relic signal transmitted by a signal receiving circuit, a resistor R10 and a resistor R12 form a sampling circuit to sample the cultural relic signal, and transmits the sampled cultural relic signal to a triode 596Q 8 through a resistor R11, and when a triode Q1 is conducted, the weak illumination signal is transmitted to the homophase end B of the operational amplifier U1 in the signal receiving circuit through a resistor R5 to carry out amplification again, when the voltage regulator tube D2 is reversely conducted by the sampled cultural relic signal, the amplitude of the cultural relic signal is over large, the surge phenomenon of the A/D converter is easy to cause, the resistance-capacitance absorption network formed by the resistor R7 and the capacitor C4 absorbs cultural relic signals with over-high amplitude, the cultural relic signals are received by the voltage regulator tube D4 and then transmitted to the emitter follower formed by the field effect tube Q3, the resistor R16 and the resistor R17 to improve the driving capability of the cultural relic signals, the signal is fed back to the non-inverting terminal of an operational amplifier U1B in the signal receiving circuit through a resistor R15 and is output to the A/D converter through a diode D5 so as to drive the A/D converter better, meanwhile, a constant current circuit is formed by the triode Q2, the adjustable resistor R14, the resistor R16 and the resistor R17 to match with the working effect of the field effect transistor Q3 for driving the A/D converter, so that the A/D converter receives more accurate cultural relic signals;

the signal receiving circuit utilizes a diode D1 to receive cultural relic signals acquired by the CCD sensor after being amplified by the amplifier, utilizes a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 to filter high-frequency signals except for low frequency of the cultural relic signals so as to avoid the influence of the high-frequency signals on the cultural relic signals, utilizes an inductor L1, a capacitor C3 and a varactor D3 to filter noise mixed in the cultural relic signals, also filters noise such as dark current noise and reset noise carried by the CCD sensor when acquiring the cultural relic signals so as to obtain pure cultural relic signals, the filtered cultural relic signals are transmitted to the same phase end of an operational amplifier U1B through the resistor R4 so as to compensate loss caused by the low-pass filtering of the cultural relic signals, and the cultural relic signals output by the operational amplifier U1B are detected by a filter consisting of a capacitor C5 and a resistor R8, detecting whether a high-frequency signal still remains in the cultural relic signal, if so, conducting a resistor R8 and a capacitor C5, feeding the cultural relic signal back to a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2, and performing low-pass filtering again to completely obtain the cultural relic signal with the required low frequency, wherein the cultural relic signal comprises a diode D1, the anode of the diode D1 is connected with an amplifier, the cathode of the diode D1 is respectively connected with one end of a capacitor C5 and one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R2 and one end of a capacitor C1, the other end of a resistor R2 is respectively connected with one end of an inductor L1 and one end of a capacitor C9, the other end of an inductor L1 is respectively connected with the anode of a varactor D3, one end of a capacitor C3 and one end of a resistor R4, and the other end of a capacitor C1 is respectively connected with the other end of, One end of the resistor R3 and one end of the resistor R8 are grounded, the other end of the resistor R4 is connected with the in-phase end of the operational amplifier U1B, the inverting end of the operational amplifier U1B is connected with the other end of the resistor R3, and the output end of the operational amplifier U1B is connected with the other end of the capacitor C5;

the signal transmission circuit firstly utilizes a resistor R10 to receive a cultural relic signal transmitted by the signal receiving circuit, a resistor R10 and a resistor R12 form a sampling circuit to sample the cultural relic signal, and the sampled cultural relic signal is transmitted to a triode Q1 by utilizing the resistor R11, because an amplifier generally amplifies the cultural relic signal under stronger illumination, the amplification factor is smaller, the amplification factor can not amplify the cultural relic signal under weaker illumination to the amplitude of the cultural relic signal obtained under the same stronger illumination, when the triode Q1 is conducted, the weak cultural relic signal under weaker illumination is detected, the weak illumination signal is transmitted to the same phase end of an operational amplifier U1B in the signal receiving circuit through the resistor R5 to be amplified again, so that the weak cultural relic signal under weaker illumination is amplified to be the same as the amplitude of the cultural relic signal obtained under stronger illumination, when the sampled cultural relic signal reversely conducts a voltage stabilizing tube D2, the method is characterized in that the amplitude of a cultural relic signal at the moment is too large and a surge phenomenon of an A/D converter is easily caused, a resistor R7 and a capacitor C4 form a resistance-capacitance absorption network to absorb the cultural relic signal with too high amplitude, the cultural relic signal is received by a voltage stabilizing tube D4 and then transmitted to an emitter follower formed by a field effect tube Q3, a resistor R16 and a resistor R17 to improve the driving capability of the cultural relic signal, the cultural relic signal is fed back to the same-phase end of an operational amplifier U1B in a signal receiving circuit through the resistor R15 and is output to the A/D converter through a diode D5 so as to better drive the A/D converter, meanwhile, a triode Q2, an adjustable resistor R14, a resistor R16 and a resistor R17 form a constant current circuit to match the working effect of the A/D converter driven by the field effect of the field effect tube Q3, the cultural relic signal processing method comprises a diode D4, and the anode of a diode D4 is, The other end of the capacitor C5, the cathode of the diode D4 is connected to one end of the resistor R16, one end of the resistor R17, and the gate of the fet Q3, the other end of the resistor R16 is connected to the drain of the fet Q3, one end of the resistor R9, and the emitter of the transistor Q1 and is connected to the positive power VCC, the source of the fet Q3 is connected to the anode of the diode D5 and one end of the resistor R15, the other end of the resistor R15 is connected to the non-inverting terminal of the operational amplifier U1B in the signal receiving circuit, the cathode of the diode D5 is connected to the collector of the transistor Q2 and the a/D converter, the emitter of the transistor Q2 is connected to one end of the resistor R13, the other end of the resistor R13 is connected to the lower end of the adjustable resistor R14, one end of the resistor R12, one end of the capacitor C4, one end of the resistor R4, one end of, the upper end of the adjustable resistor R14 is connected with the other end of the resistor R17, the other end of the resistor R12 is respectively connected with the other end of the resistor R10, one end of the resistor R11 and the cathode of the voltage regulator tube D2, the other end of the resistor R11 is respectively connected with the other end of the resistor R9, the base of the triode Q1 and the collector of the triode Q1 are respectively connected with the other end of the resistor R5 and the other end of the resistor R6, the anode of the voltage regulator tube D2 is connected with one end of the resistor R7, and the other end of the resistor R7 is connected with the other end of the capacitor C89.

When the invention is used specifically, a diode D1 in the signal receiving circuit is used for receiving a cultural relic signal acquired by the CCD sensor after being amplified by the amplifier, a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 is used for filtering so as to filter high-frequency signals except low frequency of the cultural relic signal, an inductor L1, a capacitor C3 and a varactor D3 are used for filtering clutter mixed in the cultural relic signal, noise such as dark current noise and reset noise carried by the acquired cultural relic signal by the CCD sensor is also filtered, the filtered cultural relic signal is transmitted to the in-phase end of an operational amplifier U1B through the resistor R4 so as to compensate loss caused by the cultural relic signal during low-pass filtering, the cultural relic signal output by the operational amplifier U1B is detected through a high-pass filter consisting of the capacitor C5 and the resistor R8, detecting whether a high-frequency signal still remains in the cultural relic signal, if so, conducting a resistor R8 and a capacitor C5, feeding the cultural relic signal back to a low-pass filter consisting of a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 for low-pass filtering again, receiving the cultural relic signal transmitted by a signal receiving circuit by using a resistor R10 by the signal transmission circuit, forming a sampling circuit by using a resistor R10 and a resistor R12, sampling the cultural relic signal, transmitting the sampled cultural relic signal to a triode Q1 by using a resistor R11, when a triode Q1 is conducted, transmitting a weak illumination signal to the same-phase end of an operational amplifier U1B in the signal receiving circuit through the resistor R5 for amplifying again, when a voltage stabilizing tube D2 is reversely conducted by the sampled cultural relic signal, indicating that the amplitude of the cultural relic signal is too large at the moment, and easily causing a surge phenomenon of an A/D converter, and forming a resistance capacitance absorption network by the resistor R7 and the capacitor C4, the cultural relic signal is received by a voltage regulator tube D4 and then transmitted to an emitter follower consisting of a field effect tube Q3, a resistor R16 and a resistor R17 to improve the driving capability of the cultural relic signal, the cultural relic signal is fed back to the same phase end of an operational amplifier U1B in the signal receiving circuit through the resistor R15 and is output to an A/D converter through a diode D5 so as to drive the A/D converter better, and meanwhile, a constant current circuit consisting of a triode Q2, an adjustable resistor R14, a resistor R16 and a resistor R17 is utilized to match the working effect of the field effect tube Q3 for driving the A/D converter;

the noise waves mixed in the cultural relic signal are filtered through an inductor L1, a capacitor C3 and a variable capacitance diode D3 in a signal receiving circuit, the noise carried by a CCD sensor in the collected cultural relic signal, such as dark current noise, reset noise and the like, is filtered, the cultural relic signal output by an operational amplifier U1B is detected through a high-pass filter consisting of the capacitor C5 and a resistor R8, whether a high-frequency signal still exists in the cultural relic signal is detected, if the high-frequency signal exists, the resistor R8 is conducted with the capacitor C5, the cultural relic signal is fed back to a low-pass filter consisting of the resistor R1, the resistor R2, the capacitor C1 and the capacitor C2 for low-pass filtering again to achieve a good filtering effect, a triode Q1 is arranged in the signal transmitting circuit to detect the sampled cultural relic signal, when a triode Q1 is conducted, the weak illumination signal is transmitted to the same phase end of an operational U1B in the signal receiving circuit through the resistor R5 for re-amplification, the phenomenon that the amplification factor set by the amplifier for amplifying the cultural relic signal under strong illumination is small, and the cultural relic signal under weak illumination cannot be amplified to the amplitude of the cultural relic signal obtained under the same strong illumination is avoided, so that the cultural relic signal output by the A/D converter is not beneficial to visitors to watch, and when the sampled cultural relic signal reversely conducts the voltage stabilizing tube D2, the cultural relic signal at the moment is absorbed through the resistor R7 and the capacitor C4, and the surge phenomenon of the A/D converter is avoided.

Claims

1. An image calibration device for cultural relic photos, which is characterized by comprising a signal receiving circuit and a signal transmission circuit, the signal receiving circuit utilizes a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2 to carry out low-pass filtering on the cultural relic signal transmitted by the amplifier, then, the varactor diode D3, the inductor L1 and the capacitor C3 are used for filtering noise waves in the cultural relic signal, the resistor R8 and the capacitor C5 are used for detecting whether high-frequency noise exists in the cultural relic signal and transmitting the cultural relic signal to the signal transmission circuit, the signal transmission circuit samples the cultural relic signal by using the resistor R10 and the resistor R9, detects whether a weak cultural relic signal exists in the sampled cultural relic signal by using the triode Q1, and the weak cultural relic signal is fed back to the operational amplifier U1B to be amplified again, and the cultural relic signal is output to the A/D converter by utilizing the triode Q2, the field effect transistor Q3 and the diode D5.

2. The image calibration apparatus for cultural relic photos as claimed in claim 1, wherein the signal receiving circuit comprises a diode D1, the anode of a diode D1 is connected with an amplifier, the cathode of a diode D1 is respectively connected with one end of a capacitor C5 and one end of a resistor R1, the other end of a resistor R1 is respectively connected with one end of a resistor R2 and one end of a capacitor C1, the other end of a resistor R2 is respectively connected with one end of an inductor L1 and one end of a capacitor C2, the other end of an inductor L1 is respectively connected with the anode of a varactor diode D3, one end of a capacitor C3 and one end of a resistor R4, the other end of a capacitor C1 is respectively connected with the other end of a capacitor C2, the cathode of a varactor diode D3, the other end of a capacitor C3, one end of a resistor R3 and one end of a resistor R8 are grounded, the other end of a resistor R4 is connected with the same phase terminal of an operational amplifier U1B, the opposite phase terminal of an operational amplifier U1R, the output terminal of the operational amplifier U1B is connected to the other terminal of the capacitor C5.

3. The image calibrating apparatus for cultural relic photographs, as claimed in claim 1, wherein the signal transmission circuit comprises a diode D4, the anode of the diode D4 is connected to one end of a resistor R10, the output end of an operational amplifier U1B in the signal receiving circuit, and the other end of a capacitor C5, the cathode of the diode D4 is connected to one end of a resistor R16, one end of a resistor R17, and the gate of a field effect transistor Q3, the other end of the resistor R16 is connected to the drain of a field effect transistor Q3, one end of a resistor R9, and the emitter of a transistor Q1 and is connected to a positive power supply VCC, the source of the field effect transistor Q3 is connected to the anode of a diode D5 and one end of a resistor R15, the other end of the resistor R15 is connected to the non-phase end of an operational amplifier U1B in the signal receiving circuit, the cathode of the diode D5 is connected to the collector of a transistor Q2, an A/D converter, and the emitter of a transistor Q2 is, the other end of the resistor R13 is connected with the lower end of the adjustable resistor R14, one end of the resistor R12, one end of the capacitor C4, one end of the resistor R6 and one end of the resistor R3 in the signal receiving circuit and is grounded, the base of the triode Q2 is connected with the adjustable end of the adjustable resistor R14, the upper end of the adjustable resistor R14 is connected with the other end of the resistor R17, the other end of the resistor R12 is connected with the other end of the resistor R10, one end of the resistor R11 and the negative electrode of the voltage regulator D2, the other end of the resistor R11 is connected with the other end of the resistor R9, the base of the triode Q1 and the collector of the triode Q4642 are connected with the other end of the resistor R5 and the other end of the resistor R599, the positive electrode of the voltage regulator D2 is connected with one end of the resistor R7, and the other end.