WO2006095519A1 - 光透過性パネルの透視歪検査装置および検査方法 - Google Patents
光透過性パネルの透視歪検査装置および検査方法 Download PDFInfo
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- WO2006095519A1 WO2006095519A1 PCT/JP2006/302004 JP2006302004W WO2006095519A1 WO 2006095519 A1 WO2006095519 A1 WO 2006095519A1 JP 2006302004 W JP2006302004 W JP 2006302004W WO 2006095519 A1 WO2006095519 A1 WO 2006095519A1
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- Prior art keywords
- perspective distortion
- light emitting
- panel
- image
- target mark
- Prior art date
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Classifications
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- 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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
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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
-
- 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
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/958—Inspecting transparent materials or objects, e.g. windscreens
- G01N2021/9586—Windscreens
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/06—Illumination; Optics
- G01N2201/062—LED's
- G01N2201/0626—Use of several LED's for spatial resolution
Definitions
- the present invention relates to a perspective distortion inspection apparatus and inspection method for a light transmissive panel.
- a light-transmitting glass panel having a complicated curved shape is attached to a window of a recent automobile in order to improve aerodynamic characteristics.
- Car drivers see scenery and objects outside the car through glass panels. Scenery and objects seen through the curved part of the glass panel appear distorted according to the degree of curvature of the curved part. This distortion is called perspective distortion. If the perspective distortion is greater than or equal to the allowable value, the driver feels bothered.
- a first conventional inspection method will be described. First, a glass panel is placed between the zebra board and the screen. Observe the zebra board stripe pattern projected on the screen through the glass panel. On the other hand, observe the zebra board stripe pattern projected directly on the screen without passing through the glass panel. Measure the zebra board stripe pattern change caused by the glass panel transmission. For example, the distance between striped lines is measured using a ruler to quantitatively detect perspective distortion.
- the conventional method has the problem that the measurement takes time and labor.
- Patent Document 1 a method using a display device having a plurality of light emitting diodes (LEDs) arranged at intersections of orthogonal lattices has been proposed (Patent Document 1).
- a glass panel is mounted on an automobile, a display device is placed in front of the glass panel, and a camera is placed at the driver's eye point behind the glass panel.
- three LEDs arranged on a line perpendicular to each other are sequentially turned on, and the three LEDs are imaged with a camera.
- the perspective distortion is quantitatively detected by calculation based on both strain angles.
- Non-Patent Document 1 German Industrial Standard 52305
- Patent Document 1 Japanese Patent No. 3083641
- An object of the present invention is to provide a perspective distortion inspection device and an inspection method for easily and quickly detecting perspective distortion.
- One aspect of the present invention provides a perspective distortion inspection apparatus that detects perspective distortion of each of a plurality of small regions divided into light-transmitting panels, and each of the perspective distortion inspection apparatuses is arranged in a straight line.
- a display device including a plurality of target marks that are configured by a plurality of light emitting points and spaced apart from each other at equal intervals, the display device for sequentially lighting each target mark, and imaging by tracking the target mark to be lit Imaging device, an image processing device that processes an image captured by the imaging device, an image of each target mark that is captured without passing through the panel, and an image of each target mark that passes through the panel.
- a calculation device that calculates the magnitude of the perspective distortion of the panel based on the shift of the imaging position.
- the plurality of light emitting points constituting each target mark are three light emitting diodes arranged on the straight line, and in another embodiment, two light emitting diodes arranged on the straight line. It is a light emitting diode. In one embodiment, the plurality of light emitting points constituting each target mark are arranged on a straight line inclined at 45 degrees.
- the panel is supported rotatably about the imaging device. In one embodiment, the panel Is supported so as to be movable in a direction crossing the optical axis while being maintained in a posture substantially orthogonal to the optical axis of the imaging device.
- the panel is supported so as to be movable in a direction crossing the optical axis while being maintained in a posture inclined with respect to the optical axis of the imaging device.
- the panel is a glass panel of an automobile, and the imaging device is arranged at a position corresponding to an eye point of a driver of the automobile.
- the image processing apparatus preferably includes conversion means for converting each of the captured images of the light emitting points into barycentric coordinates.
- each light emitting point is a light emitting diode.
- Another aspect of the present invention provides a perspective distortion inspection method for detecting a perspective distortion of each of a plurality of small regions divided into light-transmitting panels, and each of the perspective distortion inspection methods is arranged on a straight line.
- the imaging position of each light emitting point of each target mark is compared with the imaging position of each light emitting point of each target mark imaged through the panel, and the perspective distortion is calculated from the deviation of the imaging position of the light emitting point.
- Yet another aspect of the present invention provides a perspective distortion inspection apparatus that detects a perspective distortion of a light-transmitting panel, and the perspective distortion inspection apparatus includes a plurality of inclined target marks and selects a target mark.
- Each of the target marks is a display device that is turned on automatically, and the target device includes a plurality of light emitting points arranged on a straight line at a constant pitch, and the target mark that is lit is imaged to generate an image signal.
- An imaging device a stand for holding the light transmissive panel between the display device and the imaging device, and processing the image signal to identify the position of each light emitting point included in the image of each target mark
- the distance between the image processing device and a virtual straight line connecting the images of the light emitting points at both ends included in the image of each target mark based on the position of each light emitting point and the image of the light emitting point intermediate between the light emitting points at both ends To calculate And a computer for calculating the distance to the size of based optical distortion of.
- an image of each light-emitting point that is lit is captured as a circular or elliptical light-emitting region, and the image processing device determines the position of the center of gravity of the image of each light-emitting point in each target mark image.
- the computer calculates the distance between the virtual straight line connecting the center of gravity of the image of the light emitting point at both ends of each target mark and the center of gravity of the image of the light emitting point in the middle of the light emitting point at both ends. Based on the above, the magnitude of the perspective distortion is calculated.
- the panel has a plurality of small areas
- the computer includes a memory storing a threshold value set for each small area
- the computer is a perspective view of each measurement point of the panel. It is determined whether the amount of distortion and the perspective distortion are equal to or less than the threshold value.
- the apparatus further includes a motor that moves each of the imaging device and the table so that a line connecting the imaging device and the display device crosses various positions of the light-transmissive panel.
- the light transmissive panel includes a bending portion, and the perspective distortion inspection apparatus inspects the perspective distortion of the bending portion.
- FIG. 1 is a perspective view of a perspective distortion inspection apparatus according to a preferred embodiment of the present invention.
- FIG. 2 is a diagram showing observation zones divided into glass panels.
- FIG. 3 (a) and (b) are a front view and an enlarged view of the LED plate, respectively.
- FIG. 4 is a block diagram of the perspective distortion inspection apparatus in FIG.
- FIG. 5 (a) shows three LED images taken without passing through the glass panel, and (b) shows three LED images taken through the glass panel.
- FIG. 6 is a diagram for explaining a unit length Ao and a deviation amount S.
- FIG. 7 is a schematic diagram showing the arrangement and operation of another perspective distortion inspection apparatus.
- FIG. 8 is a schematic diagram showing the arrangement and operation of another perspective distortion inspection apparatus.
- FIG. 10 is a diagram for explaining a deviation amount S in FIG.
- FIG. 1 shows a perspective distortion inspection apparatus 1 that detects the perspective distortion of the light transmissive panel 2.
- An example of the light transmissive panel 2 is a curved glass panel such as a front windshield of an automobile.
- the perspective distortion inspection device 1 includes an LED plate 3 as a display device, a CCD camera 4 as an imaging device, a mounting table 5, a computer 6, an LED display control unit 7, a positioning control unit 8, and an image processing device 9.
- the glass panel 2 is disposed between the CCD camera 4 and the LED plate 3.
- the CCD camera 4 indirectly images the LED 10 on the LED plate 3 through the glass panel 2 or the power to directly image the LED 10 on the LED plate 3.
- FIG. 2 shows the glass panel 2 in which the driver's eye point PO (see FIG. 1) force is also seen.
- Glass panel 2 is divided into four observation zones Gl, G2, G3, and G4 as a plurality of small areas.
- the four observation zones G1 to G4 are test areas described in the public literature (“TOYOTA Technical Review Vol.43 Special Issue July 1993”), and are classified according to the driver's gaze frequency. For example, when the driver sees an object through the glass panel 2, the minimum value of the transmission strain at which the driver starts to feel the perspective distortion is different is different for each of the observation zones Gl, G2, G3, and G4.
- the first observation zone G1 is in front of the driver's eye point PO and is the most frequently used area when the driver looks forward.
- the second observation zone G2 is located on the outer periphery of the first observation zone G1, and is an area used when the driver looks at the entire front.
- the third observation zone G3 is an area located on the outer periphery of the second observation zone G2!
- the fourth observation zone G4 is a region located on the outer periphery of the second observation zone G2 above.
- different threshold values for perspective distortion are set according to the minimum distortion at which the driver begins to feel the perspective distortion bothersome.
- the perspective distortion threshold of the first observation zone G1 is V, which is smaller than those of the other second, third and fourth observation zones G2, G3, G4.
- the threshold value increases in the order of the second observation zone G2 ⁇ the third observation zone G3 ⁇ the fourth observation zone G4. In other words, since the first observation zone G1 is the most frequently used region for confirming the direction of travel of the vehicle, the perspective distortion threshold, that is, the maximum allowable value is smaller than the other observation zones G2 to G4.
- the LED plate 3 includes an LED array including LEDs 10 as a plurality of light emitters arranged at intersections of orthogonal lattices.
- three LED arrays LEDs 10 are arranged in the horizontal direction (Y direction), and a large number (in the preferred embodiment, 150) of LEDs 10 are formed by 450 LEDs 10 arranged in the vertical direction (the heel direction).
- three LEDs 10 are arranged at equal intervals along the horizontal line or horizontal line La.
- 150 LEDs 10 are arranged at equal intervals along the vertical or vertical line Lb. Since the LEDs 10 are arranged at the intersections of the orthogonal lattice, the horizontal line La and the vertical line Lb are orthogonal to each other.
- the inclined straight line Lc intersects each of the horizontal line La and the vertical line Lb at an angle of 45 degrees.
- Three LEDs 10 are arranged at equal intervals on the straight line Lc.
- the three LEDs 10 on the straight line Lc form one target mark T. Therefore, the LED plate 3 includes a plurality of target marks T arranged in parallel with each other at a constant pitch in the Z direction.
- the LED 10 has a row number (Z direction) of 1 to 150 and a column number (Y direction) of 1 to 3.
- the coordinates of the LED 10 will be described.
- the coordinates of LED10 are represented by (row number, column number), and each number starts with the first.
- the coordinates of LED10 arranged in the left column are (1, 1)
- the coordinates of LED10 arranged in the middle column are (1, 2)
- the right column The coordinates of the LED10 placed in is (1, 3).
- the coordinates of LED10 arranged in the left column are (2, 1)
- the coordinates of LED10 arranged in the middle column are (2, 2)
- the coordinates of LED10 arranged in the right column are The coordinates are (2, 3).
- the coordinates of the LED10 arranged in the left column are (n, 1)
- the coordinates of the LED10 arranged in the middle column are (n, 2)
- the LED10 arranged in the right column The coordinates of are (n, 3).
- the three LEDs 10 at coordinates (1, 3), (2, 2), and (3, 1) form a target mark T.
- the three LEDs 10 at coordinates (2, 3), (3, 2), (4, 1) form another target mark T, ..., coordinates (148, 3), (149, 2)
- the three LEDs 10 at (150, 1) form yet another target mark T.
- the unit length Ao represents the distance between two LEDs 10 arranged at both ends of each target mark T.
- CCD camera 4 is placed at eye point P0.
- the CCD camera 4 is arranged so that it can be imaged while tracking the lit target mark T through each of the first to fourth observation zones G1 to G4.
- the mounting table 5 includes a common base 11 and a camera table 12 standing on the upper surface of the common base 11.
- the camera base 12 has a tip (image pickup device) to which the swing mechanism 12a is attached. Support point).
- the head swing mechanism 12a includes a worm gear (not shown) and a motor Ml (see FIG. 4) that controls rotational driving of the worm gear.
- the CCD camera 4 is supported by the camera base 12 and is driven by the swing mechanism 12a.
- the head swing mechanism 12a rotates the CCD camera 4 around the Y axis as indicated by an arrow R1 by supplying a drive signal to the motor Ml and driving the motor Ml to control the rotation of the worm gear. .
- Common base 11 On the upper surface of the common base 11, two concentric rails 13 around the camera base 12 are formed. A swing frame 14 having a roller (not shown) is disposed on the rail 13. Common base 11 includes In addition, a variable angle mechanism including a worm gear and motor M2 (see Fig. 4) is provided. When the worm gear is driven by the motor M2, the opening rolls on the rail 13. As a result, the turning frame 14 rotates along the rail 13 around the camera base 12 as indicated by an arrow R3.
- the mounting table 5 includes a Y moving frame 15 disposed on the revolving frame 14 and an X moving frame 16 disposed on the Y moving frame 15.
- the Y moving frame 15 adjusts the position of the glass panel 2 in the Y direction with respect to the line connecting the CCD camera 4 and the LED plate 3, that is, the optical axis of the CCD camera 4.
- the Y moving frame 15 is driven by a screw feed mechanism (not shown) provided on the revolving frame 14, and the Y moving frame 15 is rotated by rotating a Y adjustment handle (not shown). Is linearly displaced with respect to the swivel frame 14 along the axis indicated by the arrow L 1.
- the X moving frame 16 adjusts the position of the glass panel 2 in the X direction with respect to the line connecting the CCD camera 4 and the LED plate 3.
- the X moving frame 16 is driven by a screw feeding mechanism (not shown) provided on the Y moving frame 15, and the X moving frame 16 is rotated by rotating the X adjusting handle to rotate the screw feeding mechanism.
- the revolving frame 14 is linearly displaced along the axis indicated by the arrow L2.
- the mounting table 5 includes a panel holding frame 17 provided on the X moving frame 16.
- the node holding frame 17 includes an angle variable mechanism (not shown) and an angle adjustment handle. By rotating the angle adjustment handle in a predetermined direction, the panel holding frame 17 rotates around the axis L1 as indicated by an arrow R2.
- the panel holding frame 17 has a holder (not shown). The holder holds the glass panel 2 so that the glass panel 2 It is attached to the panel holding frame 17 and moves together with the panel holding frame 17.
- the computer 6 is electrically connected to the LED display control unit 7, the positioning control unit 8, and the image processing device 9.
- the computer 6 is electrically connected to the monitor 18.
- the computer 6 calculates the perspective distortion and displays the calculation result on the monitor 18.
- the computer 6 includes a memory 6a that stores preset threshold values for the observation zones G1 to G4, and a CPU 6b that serves as a calculation device that executes a distortion calculation program code for calculating perspective distortion. Is provided.
- the memory 6a may store distortion calculation program codes and data.
- the computer 6 generates a timing signal Sa according to the program code stored in the memory 6a and supplies the timing signal Sa to the positioning control unit 8.
- the positioning control unit 8 generates the first and second drive signals SI, S2 according to the timing signal Sa, supplies the first drive signal S1 to the motor Ml included in the swing mechanism 12a, and the turning frame 14
- the second drive signal S2 is supplied to the motor M2 included in the variable angle mechanism.
- the motors M1 and M2 operate according to the first drive signal S1 and the second drive signal S2, respectively.
- the motor Ml rotates the swing mechanism 12a about the Y axis so as to sequentially image the CCD camera 4-force LED plate 3 from top to bottom.
- the motor M2 rotates the angle variable mechanism around the Z axis in accordance with the second drive signal S2. Specifically, the motor M2 moves the swivel frame 14 (glass panel 2) around the Z axis when the CCD camera 4 is moved by the swing mechanism 12a until it points toward the bottom row (150th row) LED10. Rotate only the angle.
- the motor Ml continues to rotate the CCD camera 4 around the Y axis until the CCD camera 4 points to the top row (first row) LED 10, and then the CCD camera 4 moves the LED plate 3 upward and downward in order. Rotate the swing mechanism 12a around the Y-axis to capture an image.
- the computer 6 generates a start signal Sb for starting control of turning on / off of each LED 10 in accordance with the program code stored in the memory 6a, and supplies the start signal Sb to the LED display control unit 7.
- the LED display control unit 7 includes an operation unit 7a.
- the operation unit 7a includes a first switch that switches the LED plate 3 on and off, and a second switch that switches whether the computer 6 or the operation unit 7a controls the turning on and off of the LED 10.
- the LED display control unit 7 Start selective lighting of LED10.
- the LED display control unit 7 selects one target mark T consisting of a set of LED10 at coordinates (1, 3), (2, 2), (3, 1). (Refer to Fig. 3 (b)), only the LED 10 of the selected target mark T is selectively supplied with drive power to light up. On the other hand, the non-selected LED 10 remains off.
- the LED display control unit 7 selects one inclined target mark T consisting of a set of LEDs 10 at coordinates (2, 3), (3, 2), and (4, 1). Drive power is selectively supplied to only the LED 10 of the selected target mark T to light it. On the other hand, the non-selected LED 10 is kept off.
- the LED display control unit 7 selects one inclined target mark T consisting of a set of LEDs 10 at coordinates (3, 3), (4, 2), (5, 1) and selects the selected target mark T. Drive power is selectively supplied to only the LED 10 of the target mark T that has been selected. On the other hand, the non-selected LED 10 is kept off.
- the LED display control unit 7 turns on the inclined target marks T extending along the straight line Lc one by one.
- An image of the LED 10 is taken by the CCD camera 4.
- the CCD camera 4 supplies an image signal G to the image processing device 9.
- the image processing device 9 generates a processed image signal SG including information indicating the position (imaging position) of each LED 10 image from the image signal G, and supplies the processed image signal SG to the computer 6.
- the image processing apparatus 9 includes a conversion circuit 9a that functions as conversion means for converting the coordinates of the LED 10 that emits light into coordinates of the center of gravity.
- the conversion circuit 9a may be software such as conversion program code.
- the barycentric coordinates of the emitting LED 10 will be described.
- the image of each LED 10 that emits light has a light emitting area having a brightness of a certain value or more. Center of gravity
- the coordinate is the center of each light emitting area on the figure. For example, when the captured LEDIO light emitting area is elliptical, the center of gravity coordinates of the elliptical light emitting area, not the center coordinates, are specified as the imaging position of the LED10.
- the image processing device 9 generates a processed image signal SG representing the imaging position of the LEDIO converted by the conversion circuit 9a, and supplies the processed image signal SG to the computer 6.
- the computer 6 calculates the perspective distortion of the processed image signal SG force for each of the observation zones G1 to G4 belonging to the imaging according to the distortion calculation program code stored in the memory 6a.
- the computer 6 controls the LED display control unit 7 to turn on three LEDIOs arranged on a predetermined target mark T, that is, on the straight line Lc.
- the CCD camera 4 is moved so as to face the target mark T by the positioning control unit 8 and images the three LEDIOs of the target mark T.
- the image signal G is supplied from the CCD camera 4 to the image processing device 9
- the processed image signal SG is supplied from the image processing device 9 to the computer 6, and the computer 6 is transparent distortion. Is calculated (sometimes called perspective distortion).
- Fig. 5 (a) shows the coordinates (1, 3), (2, 2), and Fig. 3 (b) of the image captured by the CCD camera 4 without passing through the glass panel 2 and converted to the center of gravity by the conversion circuit 9a. It is an image of three LEDIO (target mark T) in (3, 1). This image includes captured images Pl, P2, and P3. The captured images Pl, P2, and P3 are three LEDIO images at coordinates (1, 3), (2, 2), and (3, 1) in FIG.
- Fig. 5 (b) shows the coordinates (1, 3), (2, 2) in Fig. 3 (b), which are captured by the CCD camera 4 through the glass panel 2 and converted to the center coordinates by the conversion circuit 9a.
- This is an image of three LEDIO (target mark T) in (3, 1).
- This image includes captured images Ql, Q2, Q3.
- the captured images Ql, Q2, and Q3 correspond to the captured images Pl, P2, and P3, respectively.
- FIG. 6 shows the captured image P1 and captured image Ql of LED 10 at coordinates (1, 3), and the captured image P3 and captured image Q3 of LEDIO at coordinates (3, 1), respectively.
- the captured images PI, P2, and P3 are arranged on a virtual straight line inclined at 45 degrees. This is because there is no perspective distortion due to the glass panel 2 because it does not pass through the glass panel 2.
- the captured images Ql, Q2, and Q3 are not arranged on a virtual straight line inclined at 45 degrees. Yes.
- the captured image Q2 corresponding to the LEDIO located in the middle of the target mark T (LED 10 at coordinates (2, 2)) has two LEDs 10 (coordinates (1, 3) located at both ends of the target mark T.
- the computer 6 calculates the distance between the virtual line K connecting the captured images Q1 (P1) and Q3 (P3) and the captured image Q2, that is, the shift amount S, according to the distortion calculation program code.
- the computer 6 calculates the perspective distortion amount R according to the following equation based on the deviation amount S and the unit length Ao of the LED 10.
- the perspective distortion on the glass panel 2 is quantitatively detected by calculating the perspective distortion amount R for the LED 10 at each coordinate.
- the computer 6 outputs the calculated perspective distortion amount R to the monitor 18.
- the glass panel 2 is attached to the panel holding frame 17.
- the automatic detection area to be performed by the positioning control unit 8 is determined.
- the detection area is determined based on the common base so that at least one of the first to fourth observation zones G1 to G4 of the glass panel 2 is within the field of view of the CCD camera 4 according to the design of the car.
- the swing mechanism 12a is driven to determine the rotation range of the CCD camera 4 and the rotation range of the swing frame 14. Each determined rotation range is input to the computer 6.
- each target mark T is turned on in turn (lighting process).
- the target mark T that has been lit is imaged while being tracked by the CCD camera 4 (first imaging process).
- a target mark T consisting of three LEDs 10 at coordinates (1, 3), (2, 2), (3, 1) passes through a predetermined observation zone G1-G4 on the glass panel 2, and the CCD camera 4 Position the CCD camera 4 by controlling the swing mechanism 12a so that it is within the visual field.
- the target mark T is selectively lit and the target mark T is imaged by the CCD camera 4.
- the CCD camera 4 supplies the image signal G to the image processing device 9.
- the image processing device 9 processes the image signal G and generates a processed image signal SG representing the barycentric coordinates of the three LEDs 10 (image processing step).
- the computer 6 also calculates the center-of-gravity coordinates of each LED 10 for the processed image signal SG force, and stores the center-of-gravity coordinates of each LED 10 in the memory 6a.
- the target mark T composed of three LEDs 10 at coordinates (2, 3), (3, 2), (4, 1) is turned on.
- the head swing mechanism 12a is driven so that the CCD camera 4 faces downward by a predetermined angle corresponding to the lattice spacing of the LED 10.
- CCD camera 4 captures three lit LEDs 10.
- the computer 6 calculates the barycentric coordinates of each LED 10 and stores them in the memory 6a.
- the CCD camera 4 is the target mark T at the uppermost position. It is rotated by the swing mechanism 12a so as to face.
- the turning frame 14 rotates along the rail 13, and the three LEDs 10 at the coordinates (1, 3), (2, 2), (3, 1) are turned on, and the CCD camera 4 Takes an image of the target mark T, which consists of the three LEDs 10 lit through another observation zone. Thereafter, the target mark T is imaged at various positions in the observation zones G1 to G4 of the glass panel 2 in the same manner as described above.
- the glass panel 2 is not attached to the panel holding frame 17, and the calibration is performed. Measure Chillon.
- the calibration measurement is performed in the same procedure as described above except that the glass panel 2 is not attached.
- the calibration measurement includes a step of lighting the target mark T in order and a second imaging step of tracking the captured target mark T with the CCD camera 4 and capturing an image.
- a captured image of the LED 10 in a state where there is no perspective distortion is obtained, and the barycentric coordinates of each LED 10 in the state where there is no perspective distortion is calculated and stored in the memory 6a.
- the computer 6 calculates a deviation amount S of the captured image Q2 from the virtual straight line inclined at 45 degrees connecting the captured images Ql (PI) and Q3 (P3) according to the distortion calculation program code, and calculates the perspective distortion amount R. Calculate (calculation step).
- the computer 6 compares the calculated perspective distortion amount R with the threshold values of the observation zones G1 to G4 in which the captured image stored in the memory 6a is captured, and whether the perspective distortion amount R is equal to or less than the threshold value. Determine. If there is a point where the amount of perspective distortion R exceeds the threshold, it can be seen that the perspective distortion of the glass panel 2 at that point is a large defect. If the perspective distortion amount R is less than or equal to the threshold value, it can be seen that the perspective distortion of the glass panel 2 at that position is not a small defect.
- the inspection result is displayed on the monitor 18.
- the LED plate 3 has a plurality of oblique target marks T composed of three LEDs 10 arranged on a straight line Lc inclined at 45 degrees.
- a glass panel 2 is disposed between the LED plate 3 and the CCD camera 4.
- the oblique target marks T are sequentially lit, and the lit target marks T are imaged by the CCD camera 4 through a selected one of the observation zones G1 to G4 of the glass panel 2. With the glass panel 2 not placed, The target mark T is sequentially turned on, and the target mark T is imaged by the CCD camera 4 through the selected one of the observation zones G1 to G4.
- the perspective distortion amount R is calculated based on the deviation amount S from the line connecting the images of the two LEDs 10 positioned at both ends of the captured target mark T to the image of the LED 10 positioned in the middle of the target mark T. .
- the calculated perspective distortion amount R is compared with the threshold value of the selected one of the observation zones G1 to G4 stored in advance in the memory 6a to determine whether the perspective distortion amount R is equal to or less than the threshold value. If the amount of perspective distortion R is larger than the threshold value, it can be seen that the perspective distortion of the glass panel 2 at that point is very poor. If the perspective distortion amount R is less than or equal to the threshold value, it can be seen that the perspective distortion of the glass panel 2 at that point is not a small defect.
- each target mark T The three LEDs 10 constituting each target mark T are arranged on a straight line Lc inclined at 45 degrees. Therefore, the imaging position of each LED 10 includes information on the amount of distortion in the vertical direction (Z direction) and the amount of distortion in the horizontal direction (Y direction) of the glass panel 2 at the same ratio. Therefore, it is not necessary to separately measure and calculate the amount of angular distortion in the vertical and horizontal directions of a conventional panel. In order to obtain perspective distortion from the amount of angular distortion in the vertical and horizontal directions, a complicated judgment formula should not be used. Therefore, according to a preferred embodiment, the perspective distortion amount of the glass panel 2 can be easily calculated.
- the CCD camera 4 and the glass panel 2 are supported by the mounting table 5 so as to be relatively movable.
- the CCD camera 4 is supported by the camera base 12, and the direction of the Z direction with respect to the glass panel 2 is changed by the motor M1.
- the glass panel 2 is rotated around the CCD camera 4 by the motor M2.
- the computer 6 controls the driving of the motors Ml and M2 to automatically control the relative positions of the CCD camera 4 and the observation zones G1 to G4 of the glass panel 2. Since there is no human error in the alignment between the CCD camera 4 and the observation zones G1 to G4, the amount of perspective distortion can be calculated stably and with high accuracy.
- the barycentric coordinates of each LED 10 that emits light are obtained by an image processing device 9 including a conversion circuit 9a. Therefore, even if the captured image of the LED 10 has an elliptical shape rather than a circular shape, the barycentric coordinates of the captured image of the elliptical LED 10 are specified as the imaging position. Therefore, the perspective distortion amount R of the glass panel 2 can be detected with high accuracy. can do.
- the target mark T is a plurality of LEDIO. Since the LED 10 is inexpensive, the target mark T is inexpensive, and the manufacturing cost of the perspective distortion inspection apparatus 1 is reduced.
- the embodiment may be changed as follows!
- the light transmissive panel 2 may be a light transmissive panel other than an automobile glass panel, such as a transparent panel made of a synthetic resin material, for example! /.
- Calibration measurement may be performed before imaging the target mark T via the glass panel 2.
- the computer 6 may include the image processing device 9 and the CPU 6b integrally!
- the Y moving frame 15 and the X moving frame 16 are fixed at an adjusted position with respect to the common base 11, and the head swing mechanism 12a and the turning frame 14 are driven to drive the CCD camera 4 and the glass panel.
- the relative position with 2 was changed.
- the turning frame 14 and the Y moving frame 15 are fixed at positions adjusted with respect to the common base 11, and the line connecting the CCD camera 4 and the LED plate 3 (that is, the CCD camera 4).
- the relative position between the CCD camera 4 and the glass panel 2 is changed by driving the Y moving frame 15 and the swing mechanism 12a while holding the glass panel 2 in a posture substantially orthogonal to the optical axis of Yo! /
- the swivel frame 14 is rotated so that the glass panel 2 is inclined with respect to the line connecting the CCD camera 4 and the LED plate 3, and the swivel frame 14 is fixed at that position. To do.
- the relative position between the CCD camera 4 and the glass panel 2 may be changed by driving the Y moving frame 15 and the swing mechanism 12a.
- the captured image of the LED 10 has an elliptical shape, but the image processing device 9 specifies the barycentric coordinates of the captured image of the LED 10 as the imaging position. Therefore, the perspective distortion of the glass panel 2 can be detected with high sensitivity. Further, the shift amount S is amplified by the refractive index of the inclined glass panel 2. Therefore, the perspective distortion is detected with high sensitivity and high accuracy.
- each target mark T is constituted by L ED10 (for example, coordinates (1, 3), (2, 2), (3, 1)) arranged on a straight line inclined at 45 degrees.
- Each target mark T need only consist of LEDs 10 arranged in a straight line.
- each tag One get mark T is arranged on a straight line inclined at an angle different from 45 degrees (for example, coordinates (1, 3), (1, 2), (1, 1)) on a horizontal straight line LEDIO (eg coordinates (1, 3), (3, 2), (5, 1)) or LEDIOs arranged on a vertical straight line (eg coordinates (1, 3), (2, 3), (3 , 3)).
- the perspective distortion for each angle can be inspected by changing the angle of the target mark ⁇ ⁇ .
- each target mark ⁇ is composed of three LEDIOs, but it may be two LEDIOs arranged in a straight line as shown in FIG.
- Figure 9 (a) is an image of each LEDIO imaged through the glass panel 2 with the two LEDIOs lit.
- Figure 9 (b) is an image of each LEDIO taken with the two LEDIOs lit and without passing through the glass panel 2.
- the distance between the center of gravity coordinates of two LED10 images Ql and Q2 in Fig.
- the quantity R may be calculated.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP06713147A EP1857773A1 (en) | 2005-03-07 | 2006-02-06 | Perspective distortion inspecting equipment and method of translucent panel |
US11/718,168 US20080225115A1 (en) | 2005-03-07 | 2006-02-06 | Perspective Distortion inspecting Equipment and Method of Translucent Panel |
JP2007507011A JPWO2006095519A1 (ja) | 2005-03-07 | 2006-02-06 | 光透過性パネルの透視歪検査装置および検査方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-062726 | 2005-03-07 | ||
JP2005062726 | 2005-03-07 |
Publications (1)
Publication Number | Publication Date |
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WO2006095519A1 true WO2006095519A1 (ja) | 2006-09-14 |
Family
ID=36953122
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/302004 WO2006095519A1 (ja) | 2005-03-07 | 2006-02-06 | 光透過性パネルの透視歪検査装置および検査方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080225115A1 (ja) |
EP (1) | EP1857773A1 (ja) |
JP (1) | JPWO2006095519A1 (ja) |
CN (1) | CN101052857A (ja) |
WO (1) | WO2006095519A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2009042903A1 (en) * | 2007-09-28 | 2009-04-02 | Glasstech, Inc. | Method and apparatus for measuring transmitted optical distortion in glass sheets |
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JP4626982B2 (ja) * | 2005-02-10 | 2011-02-09 | セントラル硝子株式会社 | ガラス板の端面の欠陥検出装置および検出方法 |
ATE401200T1 (de) * | 2005-10-27 | 2008-08-15 | Oce Tech Bv | Antriebsmechanismus für eine zuführrolle in einem drucker |
GB0610148D0 (en) * | 2006-05-23 | 2006-06-28 | Pilkington Automotive D Gmbh | Glazing inspection method |
DE102009021733A1 (de) * | 2009-05-12 | 2010-12-30 | Carl Zeiss Oim Gmbh | Vorrichtung und Verfahren zum optischen Inspizieren eines Gegenstandes |
CN102338752B (zh) * | 2010-07-27 | 2013-04-17 | 深圳奔迅汽车玻璃有限公司 | 汽车夹层玻璃检验系统 |
FR2971588B1 (fr) * | 2011-02-11 | 2013-03-08 | Peugeot Citroen Automobiles Sa | Procede de detection de defaut optique dans un pare-brise |
KR101182822B1 (ko) * | 2011-03-29 | 2012-09-13 | 삼성전자주식회사 | 발광소자 검사장치 및 방법 |
DE102011050024A1 (de) * | 2011-04-29 | 2012-10-31 | Hamilton Bonaduz Ag | Analysevorrichtung für eine berührungslose Analyse der Ausformung eines transparenten Körpers und Verfahren zur Durchführung der berührungslosen Analyse |
CN102854459A (zh) * | 2011-06-28 | 2013-01-02 | 上海华碧检测技术有限公司 | 一种汽车车窗开关失效的检测分析方法 |
DE102011080852A1 (de) * | 2011-08-11 | 2013-02-14 | Dürr Ecoclean GmbH | Vorrichtung zum Erzeugen eines pulsierenden mit Druck beaufschlagten Fluidstrahls |
US20150122864A1 (en) * | 2013-11-06 | 2015-05-07 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Cutting device for cutting liquid crystal substrate and method for adjusting knife pressure thereof |
CN104913700B (zh) * | 2015-05-04 | 2018-10-02 | 浙江品创知识产权服务有限公司 | 一种电动车前挡风玻璃检具 |
KR101824191B1 (ko) * | 2016-11-01 | 2018-01-31 | 한국항공우주연구원 | 위성영상 손실 인식 시스템, 방법 및 컴퓨터 판독 가능한 기록매체 |
IT201800009463A1 (it) * | 2018-10-15 | 2020-04-15 | Daniele Iafrate | Metodo ed apparecchiatura per il controllo della distorsione ottica di vetri automobilistici in linea di produzione in configurazione conforme alla norma un ece r43. |
CN109448063A (zh) * | 2018-12-18 | 2019-03-08 | 苏州艾微视图像科技有限公司 | 一种镜头畸变中心标定设备及方法 |
CN113503836B (zh) * | 2021-07-07 | 2024-01-30 | 成都巨峰玻璃有限公司 | 一种检测飞机异形面风挡的方法 |
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- 2006-02-06 WO PCT/JP2006/302004 patent/WO2006095519A1/ja not_active Application Discontinuation
- 2006-02-06 JP JP2007507011A patent/JPWO2006095519A1/ja active Pending
- 2006-02-06 US US11/718,168 patent/US20080225115A1/en not_active Abandoned
- 2006-02-06 EP EP06713147A patent/EP1857773A1/en not_active Withdrawn
- 2006-02-06 CN CNA2006800011029A patent/CN101052857A/zh active Pending
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JPH05312529A (ja) * | 1992-05-06 | 1993-11-22 | Nippon Sheet Glass Co Ltd | 板状体の透視歪を検出するシステム |
JPH07128242A (ja) * | 1993-11-02 | 1995-05-19 | Nippon Sheet Glass Co Ltd | 透光性板状体の二重像を検出するシステム |
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WO2009042903A1 (en) * | 2007-09-28 | 2009-04-02 | Glasstech, Inc. | Method and apparatus for measuring transmitted optical distortion in glass sheets |
Also Published As
Publication number | Publication date |
---|---|
JPWO2006095519A1 (ja) | 2008-08-14 |
EP1857773A1 (en) | 2007-11-21 |
US20080225115A1 (en) | 2008-09-18 |
CN101052857A (zh) | 2007-10-10 |
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