CN103038602B - Employ the determinator of ccd video camera and the method for reducing of its response time - Google Patents

Employ the determinator of ccd video camera and the method for reducing of its response time Download PDF

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Publication number
CN103038602B
CN103038602B CN201280002200.XA CN201280002200A CN103038602B CN 103038602 B CN103038602 B CN 103038602B CN 201280002200 A CN201280002200 A CN 201280002200A CN 103038602 B CN103038602 B CN 103038602B
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China
Prior art keywords
video camera
light filter
time shutter
transmissivity
ask
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CN103038602A (en
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竹村将太
西川政光
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Toshiba Corp
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Toshiba Corp
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2518—Projection by scanning of the object
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/72—Combination of two or more compensation controls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N2021/1765—Method using an image detector and processing of image signal
    • G01N2021/177—Detector of the video camera type
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/59—Transmissivity
    • G01N21/5907—Densitometers
    • G01N2021/5957—Densitometers using an image detector type detector, e.g. CCD
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/86—Investigating moving sheets
    • G01N2021/8645—Investigating moving sheets using multidetectors, detector array

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Studio Devices (AREA)
  • Measurement Of Optical Distance (AREA)

Abstract

The method for reducing of the response time of determinator (100), within the time of the control cycle preset, control the time shutter of ccd video camera, the feature of described method for reducing is, the video camera that ccd video camera adopts the light filter simultaneously obtaining more than 2 of different transmissivity to export, transmissivity is ε nD1> ε nD2> ... ε nDi> ε nDi+1> ... > ε nDi+n, be the transmissivity ε making the minimum value detecting input light quantity nDithe saturation value of the measurement range that the video camera of the first high light filter exports, with transmissivity ε nDi+1the transmissivity that the minimum value of the measurement range that the video camera of the second low light filter exports is overlapping such, when the video camera output saturation of the first light filter, the video camera according to the second light filter exports, or, according to transmissivity ε nDiwith transmissivity ε nDi+1ratio, ask for the correcting gain of time shutter that the video camera that is scaled the first light filter exports, detect input light quantity with previous control cycle, upgrade the time shutter of the video camera of the first light filter with the control cycle of next time.

Description

Employ the determinator of ccd video camera and the method for reducing of its response time
Technical field
The present invention relates to determinand irradiating laser line, detect the determinator employing ccd video camera from the radiative change in location of determinand, the shape of mensuration determinand etc. by ccd video camera.
Background technology
As the determinator of the various raw-material shapes such as steel plate, there is the determinator of use ccd video camera as follows: to steel plate irradiating laser line, detect the change in location of its reflected light with ccd video camera, the shape etc. of determinand is measured (for example, referring to patent documentation 1.)。
In general, due to the determinator used in the manufacturing process of steel plate etc., the leading section of the steel plate from carrying is measured to tail end (rear end) portion, utilizes the good no yield rate judging product of measured quantity, so it is important for becoming the position carrying out the leading section measured.
Such as, when employing the apparatus for measuring thickness of Distnace determination device disclosed in patent documentation 1, can measure from which position of steel plate leading section be the thickness meeting product specification is very important function.Also be called that front end responds by from this front end to the response time carrying out the correct position measured.
But, due to when receive from the reflected light of the laser rays of steel plate adjust the distance the Distnace determination device carrying out measuring, the state of reflected light is diversity change in the reflection characteristic of steel plate leading section, so the output saturation of ccd video camera or become below noise grade and become unstable, front end is had to respond slack-off problem.
When the Distnace determination device of optical profile type in the past, possess ccd video camera and export constant such control circuit, seek the stabilization of detection signal.When possessing the Distnace determination device of ccd video camera of line sweep type, possesses to make the mode of the output of ccd video camera stabilization in constant scope to time shutter of ccd video camera (when CCD, also savings time or aperture time is said into, but after, say into the time shutter at this.) carry out controlling and AGC (AutomaticGainControl, the automatic growth control) function controlled level of signal.
In general, the response of the AGC of the ccd video camera of line sweep type, as shown in Figure 12, needs the time of 3 times of the control cycle (being also said to determination period or execution cycle) of the determinator preset.That is, in the control cycle preset, the change of its time shutter needs the first control cycle S detecting/store ccd video camera signal p1, carry out the second control cycle S of the reading of stored ccd video camera data p2, for determining to try to achieve the 3rd control cycle S of the time shutter of the grade of the ccd video camera signal preset according to the camera data read p3, control cycle S pthe time of 3 times.When can terminate to read in identical control cycle, the condition of computing, the control cycle of 2 times can also be adopted.
Time shutter, in the scope of the time of the control cycle preset, upgrades with control cycle unit, exports control ccd video camera.But, due in ccd video camera signal sets be with 10% of the saturation exposure of ccd video camera can measure time shutter, the input light quantity being more than 10 times relative to the output of this ccd video camera of 10% becomes state of saturation, so when there being the input light quantity of more than 10 times, cannot control the time shutter.
Such as, in prediction, at least need about 200 times of minimum input light quantity in the light light quantity of the leading section of steel plate according to the change of reflectivity and diffusion property thereof, cannot state of saturation be avoided.
Therefore, consider the optical filter setting in the ccd camera and light light quantity is carried out to decrement, light light quantity is detected and changes the method for time shutter.But, in this case, need the mechanical setting-up time of optical filter, have front end to respond significantly slack-off problem.
Prior art document
Patent documentation
Patent documentation 1: Jap.P. No. 3966804 publication (Fig. 1, the 1st page).
The summary of invention
The problem that invention will solve
As mentioned above, when possessing the determinator of line sweep type ccd video camera, in the setting of the time shutter in the control cycle preset, when there being the excessive input light quantity of the saturation exposure exceeding ccd video camera, needing the unit of the degree of the intensity for detecting this input light quantity, cannot carry out in the shortest time control upgrading the time shutter.Therefore, there is the response time of determinator slack-off problem.
Summary of the invention
The present invention makes to solve the problem, its object is to, there is provided a kind of controls in the ccd video camera of time shutter within the time of the control cycle preset, for the excessive input light quantity of saturation exposure exceeding this ccd video camera, can obtain can carrying out the determinator of ccd video camera signal that measures and the method for reducing of its response time in the shortest time.
To achieve these goals, the determinator employing ccd video camera of present embodiment possesses test section and control part, described test section possesses the light source portion of the surperficial illuminating laser beam of determinand and the ccd video camera of line sweep type of reflected light detecting this laser beam, described control part asks for the measured quantities such as the shape of this mensuration thing according to the output of described ccd video camera, the feature of described determinator is, described control part possesses: control circuit, generate the control cycle signal of the measured quantity of being tried to achieve by this control part, and each portion be provided in this control part, and, input the camera signal of described ccd video camera and transmit, storer, stores the camera signal transmitted from described control circuit, agc circuit portion, compare with the setting value of the video camera output level preset the camera data of the described camera signal stored, exporting to make this video camera is the time shutter that constant mode controls to set within the time of the described control cycle of described ccd video camera, and operational part, according to the described camera data controlled by described agc circuit portion, ask for described measured quantity, described ccd video camera adopts the video camera simultaneously obtaining the output of each ND light filter of the multiple different transmissivity of line sweep type, and described ND light filter comprises transmissivity ε nD0a ND light filter, transmissivity ε nD1the 2nd ND light filter, transmissivity ε nD2the 3rd ND light filter, the size of described transmissivity is ε nD0> ε nD1> ε nD2, and, it is the lower limit of the measurement range of saturation value and the described 2nd ND light filter that the video camera of a described ND light filter is exported, also has the transmissivity that the lower limit of the saturation value of described 2nd ND light filter and the measurement range of described 3rd ND light filter is overlapping such respectively, described agc circuit portion judges whether saturated the video camera of a described ND light filter exports, when described video camera output is in the scope of described setting value, the described time shutter does not upgrade and sets a front time shutter, in undersaturated situation, the setting value of described video camera output level and the output D of a ND light filter is asked for by computing 0ratio (Vr/D 0), as the first correcting gain, and then, ask for the time shutter corresponding with first correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting, when the video camera output saturation of a described ND light filter, judge the video camera output saturation of described 2nd ND light filter/unsaturated further, under the video camera of described 2nd ND light filter exports undersaturated situation, export D for by the video camera of the 2nd ND light filter 2 1the video camera being scaled a described ND light filter exports D 0the second correcting gain, by the transmissivity ε according to described setting value Vr and a described ND light filter nD0with the transmissivity ε of described 2nd ND light filter nD1ratio carry out the second correcting gain (Vr/ (D described in computing 1ε nD0/ ε nD1)) and ask for, and then, ask for try to achieve time shutter corresponding to the second correcting gain, upgrade the described time shutter having obtained the time shutter before correcting, when the video camera output saturation of described 2nd ND light filter, export D for by the video camera of the 3rd ND light filter 2the video camera being scaled a described ND light filter exports D 0the 3rd correcting gain, by the transmissivity ε according to described setting value Vr and a described ND light filter nD0with the transmissivity ε of described 3rd ND light filter nD2ratio carry out the 3rd correcting gain (Vr/ (D described in computing 2ε nD0/ ε nD2)) and ask for, and then, ask for the time shutter corresponding with the 3rd correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting, when the excessive input light quantity having the video camera output saturation of the described ND light filter making described ccd video camera such, to its degree, export according to the video camera output of described 2nd ND light filter or the video camera of described 3rd ND light filter, ask for the correcting gain to a described ND light filter, can measure with the change of single exposure time.
To achieve these goals, the determinator employing ccd video camera of present embodiment, possess test section and control part, described test section possesses the light source portion of the surperficial illuminating laser beam of determinand and the ccd video camera of line sweep type of position of reflected light detecting this laser beam, described control part asks for the measured quantities such as the shape of this mensuration thing according to the output of described ccd video camera, the feature of described determinator is, described control part possesses: control circuit, generate the control cycle signal of the measured quantity of being tried to achieve by this control part, and each portion be provided in this control part, and, input the camera signal of described ccd video camera and transmit, storer, stores the camera signal transmitted from described control circuit, agc circuit portion, compare with the setting value of the video camera output level preset the camera data of the described camera signal stored, exporting to make this video camera is the time shutter that constant mode controls to set within the time of the described control cycle of described ccd video camera, and operational part, according to the described ccd video camera controlled by described agc circuit portion, ask for measured quantity, described ccd video camera adopts the colour TV camera possessing the RGB light filter of line sweep type, and the peak value of the wavelength of described laser beam selects the transmissivity ε of described R light filter rit is the wavelength of more than 90%, described agc circuit portion judges whether saturated the video camera of described R light filter exports, when the video camera output of described R light filter is in the scope of setting value, the described time shutter does not upgrade and sets a front time shutter, in undersaturated situation, ask for the setting value Vr of described video camera output level and the output D of this R light filter 0ratio, as the first correcting gain, and then, ask for the time shutter corresponding with first correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting, when the video camera output saturation of described R light filter, judge the video camera output saturation of described B light filter/unsaturated further, export unsaturated and when being in measurement range at the video camera of described B light filter, export D for by the video camera of this B light filter bthe video camera being scaled described R light filter exports D rthe second correcting gain, by the transmissivity ε according to described setting value Vr and described B light filter bwith the transmissivity ε of described R light filter rratio carry out computing second correcting gain (Vr/ (D bε r/ ε b)) and ask for, and then, ask for the time shutter corresponding with second correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before by correction, below lower limit that is unsaturated and that be in measurement range, select the 3rd correcting gain preset becoming the output level of measurement range when the video camera being scaled R light filter exports, ask for the time shutter corresponding with the 3rd correcting gain, upgrade the described time shutter having obtained the time shutter before correcting, when the video camera output saturation of described B light filter, select to become when the video camera being scaled R light filter exports the 4th correcting gain preset measuring region, ask for the time shutter corresponding with the 4th correcting gain, upgrade the described time shutter having obtained the time shutter before correcting, when the input light quantity of described ccd video camera is the excessive input making the video camera output saturation of described R light filter such, the video camera of described B light filter is exported, ask for described first ~ four correcting gain, ask for the time shutter that the setting value that the video camera of described R light filter is output into preset is such.
To achieve these goals, the method for reducing employing the response time of the determinator of ccd video camera of present embodiment is, within the time of the control cycle preset, to the method for reducing of the response time of the determinator 100 that the time shutter of ccd video camera controls, the feature of described method for reducing is, the video camera that described ccd video camera adopts the light filter simultaneously obtaining more than 2 of different transmissivity to export, described transmissivity is ε nD1> ε nD2> ε nDi> ε nDi+1> > ε nDi+n, be the transmissivity ε making the minimum value detecting input light quantity nDithe saturation value of the measurement range that the video camera of the first high light filter exports, with transmissivity ε nDi+1the transmissivity that the minimum value of the measurement range that the video camera of the second low light filter exports is overlapping such, when the video camera output saturation of described first light filter, the video camera according to described second light filter exports, or, according to described transmissivity ε nDiwith described transmissivity ε nDi+1ratio, ask for the correcting gain of time shutter that the video camera that is scaled described first light filter exports, detect input light quantity with previous control cycle, upgrade the time shutter of the video camera of the first light filter with the control cycle of next time.
Accompanying drawing explanation
Fig. 1 is the pie graph of the determinator of the use ccd video camera of embodiment 1.
Fig. 2 is the pie graph in the agc circuit portion of embodiment 1.
Fig. 3 is the dichroism figure of video camera light filter.
Fig. 4 is the figure of the measurement range that each light filter of the video camera that embodiment 1 is described exports.
Fig. 5 is the process flow diagram of the AGC action that embodiment 1 is described.
Fig. 6 is the time diagram of the AGC action that embodiment 1 is described.
Fig. 7 is the time diagram of the AGC action that embodiment 1 is described.
Fig. 8 is the time diagram of the AGC action that embodiment 1 is described.
Fig. 9 is the time diagram of the AGC action that embodiment 1 is described.
Figure 10 is the figure of the measurement range that each light filter of the video camera that embodiment 2 is described exports.
Figure 11 is the process flow diagram of the AGC action that embodiment 2 is described.
Figure 12 is the time diagram of the AGC action of the ccd video camera illustrated in the past.
Embodiment
Below, with reference to accompanying drawing, embodiments of the invention are described.
[embodiment 1]
Referring to figs. 1 through Fig. 9, the determinator 100 of the use ccd video camera of embodiment 1 is described.Determinator 100 shown in Fig. 1 possesses test section 1 and control part 2.Test section 1 comprises the light source portion 1b of the ccd video camera 1a and illuminating laser beam etc. detected for measured quantities such as the distances to determinand 3.In addition, in test section 1, optical system corresponding to measured quantity is in advance set with.
Control part 2 possesses: control circuit 2a, sets the control cycle for asking for measured quantity; Storer 2b, the video camera stored from ccd video camera exports; Agc circuit portion 2c, carries out stabilization with the time shutter controlled in the control cycle preset to camera signal; And operational part 2d, according to the camera data that the video camera after the stabilization stored exports, ask for measured quantity.
The determinator 100 possessing ccd video camera 1a utilizes the measured quantity of trying to achieve to the setting changing the optical condition of detecting device 1 and the mathematical algorithm performed by control part 2.But, even if these change, the control carrying out the time shutter of the agc circuit portion 2c of stabilization is exported to the video camera from ccd video camera, also can carry out the correspondence of identical function.
At this, taking measured quantity as distance and asking for the Distnace determination device of the distance of steel plate is example, is described the shortening of the response time of this AGC.
In FIG, Distnace determination device 100 possesses test section 1 and control part 2, this test section 1 has the light source portion 1b of the surperficial illuminating laser beam of the determinand 3 and ccd video camera 1a of line sweep type of position of reflected light detecting this laser beam, and this control part 2 exports according to the video camera of ccd video camera 1a and asks for the distance with determinand 3.
In addition, control part 2 possesses: control circuit 2a, sets the control cycle for asking for measured quantity; Storer 2b, the video camera stored from ccd video camera 1a exports; Agc circuit portion 2c, compares with the setting value of the video camera output level preset the camera data that stored video camera exports, and exports control for the constant time shutter of mode to ccd video camera 1a to make video camera; And operational part 2d, according to the camera data controlled by agc circuit portion 2c, ask for measured quantity.
Next, the details in each portion is described.Ccd video camera 1a be with line sweep type make the output of RGB (red, green, blue) light filter simultaneously, the video camera that takes out independently, possess: the exposure time control circuit 1a3 comprising the CCD1a1 of RGB light filter, CCD element and peripheral circuit thereof, the output of CCD1a1 is converted to the ADC1a2 of digital signal and based on the time shutter setting signal sent from control part 2, light light quantity is adjusted.
In addition, light source portion 1b possesses: laser diode (LD) 1b1, and its surface forming being included in determinand 3 is the optical system of the collimator of the laser beam shape of regulation etc.; Its power driving circuit 1b2; And export initialization circuit 1b3, the output light quantity of setting laser diode 1b1.
In addition, control part 2 possesses: storer 2b, stores the camera signal S from the R light filter of ccd video camera 1a, G filter and B light filter r, S g, S b; Agc circuit portion 2c, to the camera data D that stored video camera exports r, D g, D bcompare with the setting value Vr of the video camera output level preset, export to make video camera and control for the constant time shutter of mode to ccd video camera 1a; And operational part 2d, according to the camera data D controlled by agc circuit portion 2c r, ask for measured quantity.
In addition, control circuit 2a generates the control cycle signal Sp of the measured quantity of being tried to achieve by control part 2, and provides it to each portion in control part 2, and, perform the control being used for the camera signal from ccd video camera 1a being sent to storer 2b.
Next, with reference to Fig. 2, Fig. 3, the detailed setting in each portion of the system about AGC system is described.The peak value of the wavelength of the laser beam generated by laser diode (LD) 1b1 selects the transmissivity ε making R light filter rbe more than 90% wavelength such as to vibrate the peak value of wavelength of 650nm.The transmissivity ε of G filter now, B light filter g, ε bbe about 5% as shown in Figure 3.
The detailed formation of agc circuit portion 2c possesses: correcting gain operational part 2c1, by the camera data D from storer 2b r, D g, D bread from the 2c2 of critical parameter configuration part with the critical parameter preset, based on the computing flow process shown in Fig. 5, ask for and correct details by the correcting gain α of time shutter described later; Time shutter operational part 2c3, is multiplied by the correcting gain α tried to achieve by correcting gain operational part 2c1 to the time shutter CT set with previous control cycle, generate the time shutter setting signal S after upgrading cT; And Laser output operational part 2c4, according to the condition of the input light quantity reflected from determinand 3, set the Laser output preset.
At this, the operating principle of the AGC using the Distnace determination device of the agc circuit portion 2c formed like this is described, next, its detailed action is described.
The operating principle of the present embodiment is, in order to amplify the measurement range of input light quantity, use 2 light filters of the different transmissivities of ccd video camera 1a to export simultaneously, combine detection goes out measurement range that the high light filter of the transmissivity of minimum input light quantity exports and detects the measurement range that the light filter that the transmissivity of maximum input light quantity is low exports, measurement range is amplified, input light quantity is detected with previous control cycle, the time shutter is changed with the control cycle of next time, the output being controlled to the light filter making transmissivity high is measurement range, shorten the update time of time shutter.
With reference to Fig. 4, be described for this principle being applied to the above-mentioned situation possessing the ccd video camera 1a of (colour) light filter of RGB.Fig. 4 illustrates the intensity of input light quantity, to the measurement range M of R light filter in longitudinal axis relative value rwith the measurement range M of B light filter bwith the straight line of band arrow, its scope is shown.
When the wavelength of the laser beam of light source portion 1b is 650nm, the transmissivity ε of R light filter rwith the transmissivity ε of B light filter b18 times of (=ε as shown in Figure 3 r/ ε b=90%/5%).In this case, as shown in Figure 4, the upper limit (100%) of the measurement range of R light filter and the lower limit (5.6%) of B light filter consistent.
In addition, the minimum value Pmin of light quantity and the measurement range M of R light filter is inputted r20% quite, when set 200 times of this minimum input light quantity as maximal value Pmax time, before the higher limit of B light filter, can input light quantity be learnt.But, for the input light quantity of the higher limit more than B light filter, show and can only distinguish whether exceeded.
In addition, as long as in the measurement range of B light filter, the input light quantity that its input light quantity is used as the value being scaled R light filter can just be asked for.Therefore, by learning the input light quantity of B light filter, the time shutter of R light filter can be asked for simultaneously.
In addition, the measurement range M of the input light quantity of R light filter rthe optical settings condition of detecting device 1 is utilized to set in advance.Such as, the reflection characteristic of determinand 3 is set in advance with the brightness (efficiency) of the optical system of the detecting device 1 of energy light, according to detection sensitivity and the control cycle asking for measured value of ccd video camera 1a, to predicting from the minimum value of the input light quantity of determinand 3 light and maximal value.
Then, the time shutter CT of Laser output to minimum input light quantity and ccd video camera 1a is set.At this, the minimum value Pmin of input light quantity is the output of the R light filter of ccd video camera 1a is 20% of more than 2 times of noise grade, in addition, maximal value be predicted as 200 times of minimum input light quantity, relative value is 40.
Next, with reference to Fig. 5 to Fig. 9, the action of the agc circuit portion 2c based on such principle is described.The computing action of the correcting gain α of the time shutter CT asked for for upgrading agc circuit portion 2c is become process flow diagram by Fig. 5.
In Figure 5, camera data D r, D bthe output of R light filter, B light filter is shown respectively, at its camera data D rfiducial value be measurement range M r80% when, by D r80describe like that.
In addition, the setting value shown in Fig. 5, critical parameter are prestored in the critical parameter configuration part 2c2 shown in Fig. 2.
First, according to time shutter operational part 2c3, Laser output operational part 2c4 to ccd video camera 1a and light source portion 1b, set the initial value (s1) of time shutter CT and Laser output respectively.
Next, camera data D is read from storer 2b r, D b(s2), camera data D is judged rwhether saturated (s3).Be judged to be in undersaturated situation, judging whether this camera data is in the interior (D of scope of the setting value (control objectives value) of regulation further r80>=D r>=D r70) (s4), be under such circumstances, do not entering into next computing (s4-"Yes") with upgrading the time shutter.
When being judged to be scope outer (s4-"No"), ask for correcting gain the α 1 (=Vr/D to setting value Vr r) (s5).Then, the time shutter CT1 corresponding with the correcting gain α 1 tried to achieve (=CTi × α 1, CTi=upgrade before time shutter) is asked for, by time shutter setting signal S with time shutter operational part 2c3 cTdeliver to ccd video camera 1a (s6).
Next, camera data D is being judged to be rwhen saturated (s3-"Yes"), judge camera data D bwhether saturated (s7).At camera data D bin undersaturated situation, judge camera data D further bbe whether lower limit (such as, the camera data D of measurement range b10%) below (s8), if not like this (s8-"No"), then by camera data D bvalue be scaled camera data D r, ask for camera data D rcorrecting gain α 2 (=Vr/ (D bε r/ ε b)) (s9).
And then ask for the time shutter CT2 corresponding with the correcting gain α 2 tried to achieve (=CTi × α 2, CTi=upgrade before time shutter), by time shutter setting signal S with time shutter operational part 2c3 cTdeliver to ccd video camera 1a (s6).
If like this (s8-"Yes"), if i.e., camera data D bbe measurement range lower limit below, then select the camera data D making now rcorrecting gain α 3 that become measurement range, that preset, such as 1/2 (s10), the time shutter CT3 corresponding with the correcting gain α 3 selected (=CTi × α 3, CTi=upgrade before time shutter) is asked for time shutter operational part 2c3.Then, the time shutter setting signal S will tried to achieve cTdeliver to ccd video camera 1a (s6), and then, confirm the time shutter setting signal S after upgrading cTcontrol cycle in camera data D rif exceed the scope of setting value, then upgrade time shutter setting signal S with the control cycle of next time cT(s3-s4-s5).
Next, at camera data D bwhen saturated (s7-"Yes"), select the camera data D made now rcorrecting gain α 4 such as 1/50 (s11) that become measurement range, that preset, the time shutter CT4 corresponding with the correcting gain α 4 selected (=CTi × α 4, CTi=upgrade before time shutter) is asked for time shutter operational part 2c3.Then, the time shutter setting signal S will tried to achieve cTdeliver to ccd video camera 1a (s6), and then, confirm the time shutter setting signal S after upgrading cTcontrol cycle in camera data D rif exceed the scope of setting value, then upgrade time shutter setting signal S with the control cycle of next time cT(s3-s4-s5).
Although the correcting gain α 3, the α 4 that select have selected 1/2 and 1/50, at camera data D respectively at this bwhen having exceeded lower limit or the higher limit of measurement range, as long as the input light quantity of supposition becomes camera data D rscope in value, then this value can be just arbitrary value.
Next, to the flow process of Fig. 5, to the example of the computing action of 4 kinds of correcting gains, use its time diagram to be described.The time diagram of computing when Fig. 6 is the correcting gain α 1 in the unsaturated situation of output of the R light filter asking for ccd video camera 1a.
By control cycle S p0the camera data detected is with next control cycle S p1read, and then, with the control cycle S of next time p2ask for its correcting gain α 1, need 3 times of control cycle, show the camera data D obtaining the time shutter CT1 after upgrading r1appearance.
In addition, camera data D at this moment r0when being 30% with relative light quantity as shown in Figure 4, when setting value Vr is 75%, its correcting gain α 1 is 2.5, if this input light quantity does not change, then corrects the camera data D after the time shutter r1export and become 75% after 3 times of control cycle.
In addition, the time diagram of computing when correcting gain α 2 when Fig. 7 has been the output saturation of the R light filter asking for ccd video camera 1a.
With control cycle S p0the camera data detected is with next control cycle S p1read, and then, with next control cycle S p2ask for its correcting gain α 2.In this case, need 3 times of control cycle, show the camera data D obtaining the time shutter CT1 after upgrading r2appearance.
In addition, at camera data D ras Fig. 4 to illustrate with relative light quantity be 540% when (s8, s9), its correcting gain α 2 is 0.139, if this input light quantity is constant, then corrects the camera data D after the time shutter r2export and become 75% after 3 times of control cycle.
In addition, Fig. 8 be the output saturation of the R light filter asking for ccd video camera 1a and the output of B light filter is below lower limit when correcting gain α 3, α 1 when the time diagram of computing.
With control cycle S p0detect that camera data is with next control cycle S p1read, and then, with next control cycle S p2ask for its correcting gain α 3.
And, need 3 times of control cycle, the camera data D of time shutter CT31 in the updated r31, and then, due to camera data D r31not in measurement range, so also need the control cycle of 3 times, show the camera data D after obtaining the time shutter CT32 correction after with renewal r32appearance.
Camera data D in this case rwith the relative light quantity shown in Fig. 4 for 100%, at camera data D bwhen being 5.6% with relative light quantity (s8, s10), its correcting gain α 3 is 0.5.Then, if this input light quantity is constant, then and then by time shutter CT31 being updated to time shutter CT32, the camera data D after correcting being obtained afterwards needing 6 times of control cycle r32.
In addition, Fig. 9 be the R light filter asking for ccd video camera 1a output saturation and and then the output saturation of B light filter when correcting gain α 4, α 1 when the time diagram of computing.
With control cycle S p0the camera data detected is with next control cycle S p1read, and then, with next control cycle S p2ask for its correcting gain α 4.Then, need 3 times of control cycle, the camera data D of time shutter CT41 in the updated r41, and then, due to camera data D r41not in measurement range, so also need the control cycle of 3 times, show the camera data D obtaining and corrected by the time shutter CT42 after upgrading r42appearance.
In this case camera data D rwith the relative light quantity shown in Fig. 4 for 1800%, at camera data D bwhen being 100% with relative light quantity (s8, s11), its correcting gain α 4 is 0.02.And, if this input light quantity is constant, then and then by time shutter CT41 be updated to time shutter CT42, the camera data D after correcting can be obtained after 6 times that need control cycle r42.
In addition, although in the present embodiment, have selected B light filter and be illustrated as a light filter of different transmissivity, even if use G filter, when the wavelength of the laser beam selected is 650nm, also can obtain same effect.
As described above, according to the present embodiment, in order to amplify the measurement range of input light quantity, use 2 light filters of the different transmissivities of ccd video camera 1a to export simultaneously, combine detection goes out to input measurement range that the high light filter of the transmissivity of the minimum value of light quantity exports and the measurement range that the low light filter of transmissivity exports, measurement range is amplified, with previous control cycle, input light quantity is detected, the time shutter of the high light filter output of transmissivity is upgraded with the control cycle of next time, therefore, even if the variation range of input light quantity is large, also the renewal of time shutter can be done sth. in advance.
Namely, according to the present embodiment, can provide in a kind of time shutter within the control cycle time preset, for the excessive input light quantity of saturation exposure exceeding ccd video camera, can obtain can carrying out the determinator of ccd video camera signal that measures and the method for reducing of its response time in the shortest time.
[embodiment 2]
With reference to Figure 10, Figure 11, embodiment 2 is described.For embodiment 2, the part identical with embodiment 1 marks identical Reference numeral, and the description thereof will be omitted.
Embodiment 2 with the difference of embodiment 1 is, in embodiment 1, as the light filter of the measurement range for amplifying input light quantity, employ the light filter of RGB, but replace the light filter of RGB in example 2, the neutral density filter of the 3 kinds of different transmissivities using spectral transmission smooth, light filter ND0, ND1, ND2, this point is different.
Specifically, as shown in Figure 10, ccd video camera 1a is set to the video camera of the output of each ND light filter of the multiple different transmissivity that can obtain line sweep type.ND light filter is by transmissivity ε nD0light filter ND0, transmissivity ε nD1light filter ND1, transmissivity ε nD2light filter ND2 form, and the size of respective transmissivity is ε nD0> ε nD1> ε nD2and, be make the maximal value of the maximal value of the measurement range of light filter ND0 (saturation value) with the lower limit of the measurement range of the ND1 of light filter, the in addition measurement range of light filter ND1 and lower limit overlapping such transmissivity respectively of the measurement range of light filter ND2.
Such as, the size of transmissivity selects ε when being set as nD0=1.0, ε nD1=1/8, ε nD2=1/8 2value time, in light filter ND0, the minimum value of input light can be received when not dim light.In addition, the lap of the measurement range between light filter is when by when being set as maximal value 100% ~ minimum value 10% in the measurement range of each light filter, the respective overlap length of the lower limit of the lower limit of the maximal value of the measurement range of light filter ND0 and the measurement range of light filter ND1, the maximal value of the measurement range of light filter ND1 and the measurement range of light filter ND2 is 2%, in 3 light filters, the measurement range of input light quantity (relative value) can to 0.2 ~ 64.
According to imposing a condition of the ccd video camera 1a formed like this, as shown in Figure 11, though when input light quantity be changed to 320 times (=64/0.2), also according to the output of arbitrary light filter, its value can be detected.Therefore, be any one of 3 kinds in the computing of the correcting gain of agc circuit portion 2c, and the computing of correcting gain become once.
Referring to the computing flow process of correcting gain asking for Figure 11, the control action of this agc circuit portion 2c is described.In fig. 11, camera data D 0, D 1, D 2the output of light filter ND0, light filter ND1 from storer 2b reading, light filter ND2 is shown respectively, at this camera data D 0fiducial value be measurement range M nD080% when, by D 080describe like that.
In addition, the setting value shown in Figure 11, critical parameter are stored in advance in the critical parameter configuration part 2c2 shown in Fig. 2.
First, according to time shutter operational part 2c3, Laser output operational part 2c4, to ccd video camera 1a and light source portion 1b, set the initial value (s1) of time shutter CT and Laser output respectively.
Next, from storer 2b, camera data D is read 0, D 1, D 2(s2), camera data D is judged 0whether saturated (s3).Be judged to be in undersaturated situation, judging whether this camera data is in the interior (D of scope of the setting value Vr (control objectives value) of regulation further 080>=D 0>=D 070) (s4), be under such circumstances, do not entering into next computing (s4-"Yes") with upgrading the time shutter.
When being judged to be scope outer (s4-"No"), agc circuit portion 2c1 asks for the setting value Vr of video camera output level and the output D of ND light filter 0ratio, ask for correcting gain α 11 (=Vr/D 0).And then, ask for the time shutter CT11 (=CTi × α 11) corresponding with the correcting gain α 11 tried to achieve, the time shutter Cti before correcting is updated to time shutter CT11 (s6).
When the video camera output saturation of light filter ND0 (s3-"Yes"), the video camera output saturation of further judgement light filter ND1/unsaturated, at (s7), under the video camera of light filter ND1 exports undersaturated situation (s7-"No"), export D for by the video camera of light filter ND1 1the video camera being scaled light filter ND0 exports D 0correcting gain α 12, if video camera export setting value be Vr, by computing correcting gain α 12 (=Vr/ (D 1ε nD0/ ε nD1)) ask for.And then, ask for the time shutter CT12 (=CTi × α 12) (s8) corresponding with the correcting gain α 12 tried to achieve, be updated to the time shutter CT12 (s6) having obtained the time shutter Cti before correcting.
In addition, D is exported at the video camera of light filter ND1 1when saturated (s7-"Yes"), export D for by the video camera of light filter ND2 2the video camera being scaled light filter ND0 exports D 0correcting gain α 13, if video camera export setting value be Vr, by computing correcting gain α 13 (=Vr/ (D 2ε nD0/ ε nD2)) ask for (s9).
And then, ask for the time shutter CT13 (=CTi × α 13) corresponding with the correcting gain α 13 tried to achieve, the time shutter Cti before correcting is updated to time shutter CT13 (s6).
Namely, when the excessive input light quantity having the video camera output saturation of the light filter ND0 making ccd video camera such, its degree is exported according to the video camera output of light filter ND1 or the video camera of light filter ND2, ask for the correcting gain to light filter ND0, can measure with the change of time shutter once, therefore, even if when inputting the measurement range sudden turn of events greatly of light quantity, also the response time can be made to shorten.
In addition, although the description of several embodiment of the present invention, but these embodiments are pointed out out as an example, are not intended to limit scope of invention.These new embodiments can be implemented in other various modes, not departing from the scope of main idea of invention, can carry out various omissions, displacement, change.These embodiment and distortion thereof, be included in scope of invention or main idea, and be included in the scope of the invention equalization recorded with claims.
The explanation of symbol
1 test section
1aCCD video camera
1a1CCD
1a2ADC
1a3 exposure control circuit
1b light source portion
1b1LD
1b2 power driving circuit
1b3 exports initialization circuit
2 control parts
2a control circuit
2b storer
2cAGC circuit
2c1 correcting gain operational part
2c2 critical parameter configuration part
2c3 time shutter operational part
2c4 Laser output operational part
2d operational part
3 determinands
100 determinators

Claims (4)

1. one kind employs the determinator of ccd video camera, possess test section and control part, described test section possesses the light source portion of the surperficial illuminating laser beam of determinand and the ccd video camera of line sweep type of reflected light detecting this laser beam, described control part asks for the measured quantity of the shape of this mensuration thing according to the output of described ccd video camera, the feature of described determinator is
Described control part possesses: control circuit, generates the control cycle signal of the measured quantity of being tried to achieve by this control part, and is provided to each portion in this control part, and, input the camera signal of described ccd video camera and transmit; Storer, stores the camera signal transmitted from described control circuit from described ccd video camera; Agc circuit portion, compare with the setting value of the video camera output level preset the camera data of the described camera signal stored, exporting to make this video camera is the time shutter that constant mode controls to set within the time of the described control cycle of described ccd video camera; And operational part, according to the described camera data controlled by described agc circuit portion, ask for described measured quantity,
Described ccd video camera adopts the video camera simultaneously obtaining the output of each ND light filter of the multiple different transmissivity of line sweep type, and described ND light filter comprises transmissivity ε nD0a ND light filter, transmissivity ε nD1the 2nd ND light filter, transmissivity ε nD2the 3rd ND light filter,
The size of described transmissivity is ε nD0> ε nD1> ε nD2and, be the lower limit of the measurement range of saturation value and the described 2nd ND light filter that the video camera of a described ND light filter is exported, also have the lower limit of the saturation value of described 2nd ND light filter and the measurement range of the described 3rd ND light filter transmissivity that overlap is such respectively
Described agc circuit portion judges whether saturated the video camera of a described ND light filter exports, when described video camera output is in the scope of described setting value, the described time shutter does not upgrade and sets a front time shutter, in undersaturated situation, asked for the setting value of described video camera output level and the output D of a ND light filter by computing 0ratio (Vr/D 0), as the first correcting gain, and then, ask for the time shutter corresponding with first correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting,
When the video camera output saturation of a described ND light filter, the video camera output saturation of the described 2nd ND light filter of further judgement/unsaturated, under the video camera of described 2nd ND light filter exports undersaturated situation, export D for by the video camera of the 2nd ND light filter 1the video camera being scaled a described ND light filter exports D 0the second correcting gain, by the transmissivity ε according to described setting value Vr and a described ND light filter nD0with the transmissivity ε of described 2nd ND light filter nD1ratio carry out the second correcting gain (Vr/ (D described in computing 1ε nD0/ ε nD1)) and ask for, and then, ask for the time shutter corresponding with second correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting,
When the video camera output saturation of described 2nd ND light filter, export D for by the video camera of the 3rd ND light filter 2the video camera being scaled a described ND light filter exports D 0the 3rd correcting gain, by the transmissivity ε according to described setting value Vr and a described ND light filter nD0with the transmissivity ε of described 3rd ND light filter nD2ratio carry out the 3rd correcting gain (Vr/ (D described in computing 2ε nD0/ ε nD2)) and ask for, and then, ask for the time shutter corresponding with the 3rd correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting,
When the excessive input light quantity having the video camera output saturation of the described ND light filter making described ccd video camera such, to its degree, export according to the video camera output of described 2nd ND light filter or the video camera of described 3rd ND light filter, ask for the correcting gain to a described ND light filter
Can measure with the change of single exposure time.
2. one kind employs the determinator of ccd video camera, possess test section and control part, described test section possesses the light source portion of the surperficial illuminating laser beam of determinand and the ccd video camera of line sweep type of position of reflected light detecting this laser beam, described control part asks for the measured quantity of the shape of this mensuration thing according to the output of described ccd video camera, the feature of described determinator is
Described control part possesses: control circuit, generates the control cycle signal of the measured quantity of being tried to achieve by this control part, and is provided to each portion in this control part, and, input the camera signal of described ccd video camera and transmit; Storer, stores the camera signal transmitted from described control circuit; Agc circuit portion, compare with the setting value of the video camera output level preset the camera data of the described camera signal stored, exporting to make this video camera is the time shutter that constant mode controls to set within the time of the described control cycle of described ccd video camera; And operational part, according to the described ccd video camera controlled by described agc circuit portion, ask for measured quantity,
Described ccd video camera adopts the colour TV camera possessing the RGB light filter of line sweep type,
The peak value of the wavelength of described laser beam selects the transmissivity ε of described R light filter rbe the wavelength of more than 90%,
Described agc circuit portion judges whether saturated the video camera of described R light filter exports, when the video camera output of described R light filter is in the scope of setting value, the described time shutter does not upgrade and sets a front time shutter, in undersaturated situation, ask for the setting value Vr of described video camera output level and the output D of this R light filter 0ratio, as the first correcting gain, and then, ask for the time shutter corresponding with first correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting,
When the video camera output saturation of described R light filter, the video camera output saturation of further judgement described B light filter/unsaturated, export unsaturated and when being in measurement range at the video camera of described B light filter, export D for by the video camera of this B light filter bthe video camera being scaled described R light filter exports D rthe second correcting gain, by the transmissivity ε according to described setting value Vr and described B light filter bwith the transmissivity ε of described R light filter rratio carry out computing second correcting gain (Vr/ (D bε r/ ε b)) and ask for, and then, ask for the time shutter corresponding with second correcting gain of trying to achieve, upgrade the described time shutter having obtained the time shutter before correcting,
Below lower limit that is unsaturated and that be in measurement range, select the 3rd correcting gain preset becoming the output level of measurement range when the video camera being scaled R light filter exports, ask for the time shutter corresponding with the 3rd correcting gain, upgrade the described time shutter having obtained the time shutter before correcting
When the video camera output saturation of described B light filter, select to become when the video camera being scaled R light filter exports the 4th correcting gain preset measuring region, ask for the time shutter corresponding with the 4th correcting gain, upgrade the described time shutter having obtained the time shutter before correcting
When the input light quantity of described ccd video camera is the excessive input making the video camera output saturation of described R light filter such, the video camera of described B light filter is exported, ask for described first ~ four correcting gain, ask for the time shutter that the setting value that the video camera of described R light filter is output into preset is such.
3. the determinator employing ccd video camera according to claim 2, wherein, replaces the output of described B light filter, and adopts the output of G filter.
4. one kind employs the method for reducing of the response time of the determinator of ccd video camera, it is within the time of the control cycle preset, to the method for reducing of the response time of the determinator that the time shutter of ccd video camera controls, the feature of described method for reducing is
The video camera that described ccd video camera adopts the light filter simultaneously obtaining more than 2 of different transmissivity to export,
Described transmissivity is ε nD1> ε nD2> ε nDi> ε nDi+1> > ε nDi+n,
Described transmissivity is the transmissivity ε making the minimum value detecting input light quantity nDithe saturation value of the measurement range that the video camera of the first high light filter exports, with transmissivity ε nDi+1the transmissivity that the minimum value of the measurement range that the video camera of the second low light filter exports is overlapping such,
When the video camera output saturation of described first light filter, the video camera according to described second light filter exports, or, according to described transmissivity ε nDiwith described transmissivity ε nDi+1ratio, ask for the correcting gain of time shutter that the video camera that is scaled described first light filter exports,
Detect input light quantity with previous control cycle, upgrade the time shutter of the video camera of the first light filter with the control cycle of next time.
CN201280002200.XA 2011-04-04 2012-03-14 Employ the determinator of ccd video camera and the method for reducing of its response time Expired - Fee Related CN103038602B (en)

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