WO2015170603A1 - 測色装置および測色方法 - Google Patents
測色装置および測色方法 Download PDFInfo
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- WO2015170603A1 WO2015170603A1 PCT/JP2015/062434 JP2015062434W WO2015170603A1 WO 2015170603 A1 WO2015170603 A1 WO 2015170603A1 JP 2015062434 W JP2015062434 W JP 2015062434W WO 2015170603 A1 WO2015170603 A1 WO 2015170603A1
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- 238000005259 measurement Methods 0.000 title claims abstract description 199
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- 238000003384 imaging method Methods 0.000 claims abstract description 222
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- 230000032258 transport Effects 0.000 claims description 30
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- H04N1/00681—Detecting the presence, position or size of a sheet or correcting its position before scanning
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/52—Measurement of colour; Colour measuring devices, e.g. colorimeters using colour charts
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
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Definitions
- the present invention relates to a color measuring device and a color measuring method for measuring a color, and more particularly to a color measuring device and a color measuring method capable of automatically measuring colors at an appropriate position.
- a company that produces a color printed material such as a printing company regularly measures the color of the printed material and adjusts the color of the printing apparatus that printed the printed material in order to maintain the quality of the printed material.
- color adjustment of the printing apparatus for example, original image data called a color chart is printed by the printing apparatus, and each color of each patch in the printed color chart is measured by the color measurement apparatus. Then, the color misregistration amount between the actually measured value of each patch color and the target value of each patch color is evaluated, and the color of the printing apparatus is adjusted according to the evaluation result.
- the color chart includes a plurality of color samples called patches, and each of the plurality of patches is formed with different colors (hue, lightness, saturation) and arranged in a predetermined manner.
- color charts there are various types of such color charts.
- a color chart of an aspect configured by arranging a plurality of rectangular patches having various colors vertically and horizontally in a two-dimensional array.
- each patch is arranged so that it becomes a random (random) color arrangement according to the content to be evaluated, or the change in shading between adjacent patches like a gradation
- There are various patterns such as each patch being arranged so that there is less.
- Such a color chart is not only created by the user by using a color chart creation tool provided by the manufacturer of the color measurement device, but also provided by a public institution. As described above, the color chart has a variety of patterns depending on the difference in the shape, arrangement, and color arrangement of the patches.
- Patent Document 1 captures a two-dimensional color image of a color chart to be measured, calculates a patch position by an image processing method using a computer, and performs colorimetry on the determined patch position.
- a method for measuring the color chart by moving the head has been proposed by Gretag-Macbeth.
- the design value is the position of each patch obtained based on the color chart image obtained in the imaging unit.
- the colorimetric unit cannot always be moved.
- the color chart is fed by a conveyance unit such as a conveyance roller and the patch to be measured is positioned on the measurement side unit, it is obtained by the imaging unit due to a slip generated between the color chart and the conveyance roller.
- the color measurement unit cannot be moved to the position of each patch obtained based on the obtained color chart image.
- the present invention has been made in view of the above-described circumstances, and its purpose is to measure each patch at a more appropriate position by actually measuring information on the relative positional relationship between the imaging unit and the colorimetric unit.
- a color measuring device and a color measuring method are provided.
- a relative position calibration in which a calibration figure having a calibration feature capable of detecting a position along at least one of the first and second directions orthogonal to each other is drawn.
- the image of the chart for image acquisition is acquired by the imaging unit, the chart for relative position calibration is measured by the color measurement unit, the calibration feature in the image of the relative position calibration chart by the imaging unit, and the chart for relative position calibration by the color measurement unit
- the relative positional relationship information is obtained based on the calibration feature in the colorimetric result.
- each position of each patch is corrected based on the information on the relative positional relationship.
- the color is measured. Therefore, the color measurement device and the color measurement method according to the present invention can measure each patch at a more appropriate position by actually measuring information on the relative positional relationship between the imaging unit and the color measurement unit.
- 1 is a perspective view illustrating a schematic configuration of a color measurement device according to an embodiment. It is a schematic side view which shows the arrangement
- FIG. 19 shows a binarized vertical edge image of the color chart shown in FIG. 18 as an example.
- FIG. 19 is a diagram showing a part of a vertical edge line of the color chart shown in FIG. 18 as an example.
- FIG. 19 shows a binarized horizontal edge image of the color chart shown in FIG. 18 as an example.
- FIG. 19 is a diagram showing a part of a horizontal edge line of the color chart shown in FIG. 18 as an example.
- FIG. 1 is a perspective view illustrating a schematic configuration of a color measuring device according to an embodiment.
- FIG. 2 is a schematic side view illustrating an arrangement relationship between the imaging unit and the color measurement unit in the color measurement device according to the embodiment.
- FIG. 3 is a schematic top view illustrating an arrangement relationship between the imaging unit and the color measurement unit in the color measurement device according to the embodiment.
- FIG. 4 is a block diagram illustrating an electrical configuration of the color measurement device according to the embodiment.
- the color measurement device CM in the present embodiment is a device that measures the color (hue, lightness, saturation) of an object to be measured. For example, as shown in FIGS.
- Direction moving unit (paper transport unit) 2 color measuring unit 3, main scanning direction moving unit 4, imaging unit 5, control processing unit 6, input unit 7, output unit 8, and interface unit (IF Part) 9 and a storage unit 10.
- the paper feeding unit 1 is a paper transport mechanism that is connected to the control processing unit 6 and takes in the paper of the object to be measured set in the color measurement device CM into the color measurement device CM under the control of the control processing unit 6.
- the paper of the object to be measured may be arbitrary, but for example, when adjusting the color of the printing apparatus, it is a color chart CT including a plurality of patches that are areas of a predetermined color, and for example, a color measurement unit 3 is a relative position calibration chart PCT on which a calibration figure having a predetermined calibration feature is drawn.
- the paper feed unit 1 includes, for example, a storage unit that stores paper of the object to be measured, and a pickup roller that picks up the paper of the object to be measured stored in the storage unit and takes it into the color measurement device CM, for example
- a take-up unit configured to include a feed roller configured to include, for example, a transport roller that transports the paper of the measurement object captured by the capture unit to the sub-scanning direction moving unit 2.
- the sub-scanning direction moving unit (paper transport unit) 2 is connected to the control processing unit 6, and in accordance with the control of the control processing unit 6, the paper of the measurement object sent from the paper feeding unit 1 is set in advance as the main scanning direction
- This is a paper transport mechanism that transports a predetermined amount by a unit transport command (second unit transport command) in the sub-scanning direction (second direction) orthogonal to the first direction.
- the sub-scanning direction moving unit 2 is configured so that it can be conveyed in the forward and reverse directions along the sub-scanning direction.
- the forward feed is, for example, transporting the paper to be measured from the upstream side (paper feed unit 1 side) to the downstream side (discharge side), and the reverse feed is in a direction opposite to the forward feed direction, that is, This is to convey the paper to be measured from the downstream side to the upstream side.
- the sub-scanning direction moving unit 2 includes, for example, a plurality of sets of paper conveyance roller units and a driving unit that rotationally drives the paper conveyance rollers.
- Each set of paper conveyance roller units includes a driving roller that is rotationally driven by the driving unit and a driven roller that is rotationally driven according to the rotational driving of the driving roller.
- the drive unit includes, for example, a stepping motor (sub-scanning stepping motor).
- the sub-scanning stepping motor receives a single drive pulse (second drive pulse, an example of the second unit transport command), so that a predetermined pulse is input.
- the drive roller is rotated by a predetermined angle (22nd angle) by the rotation of the sub-scanning stepping motor, and the object to be measured is rotated by the rotation of the drive roller.
- Paper is conveyed (moved) by a predetermined amount along the sub-scanning direction. More specifically, in the example shown in FIG. 2, the sub-scanning direction moving unit 2 includes three sets of first to third paper conveying roller units 20-1 to 20-3.
- first to third paper transport roller portions 20-1 to 20-3 are arranged in order from the upstream side to the downstream side along the sub-scanning direction.
- Each of the first to third paper conveying roller units 20-1 to 20-3 includes first to third driving rollers 21-1 to 21-3 and first to third driven rollers 22-1 to 22-3.
- the first to third drive rollers 21-1 to 21-3 are rotated by first to third stepping motors (not shown) that rotate in synchronization with each other.
- the paper of the object to be measured sent from the paper supply unit 1 is sandwiched between the pair of first driving roller 21-1 and first driven roller 22-1 in the forward feed, and the first driving roller 21-1 Is driven to rotate in the normal direction (for example, clockwise) by the drive unit, and is conveyed from the first paper conveyance roller unit 20-1 to the second paper conveyance roller unit 20-2.
- the paper of the object to be measured conveyed to the second paper conveyance roller unit 20-2 is similarly transferred from the second paper conveyance roller unit 20-2 to the third paper conveyance roller unit 20- by the second paper conveyance roller unit 20-2. 3 is conveyed.
- the paper of the object to be measured conveyed to the third paper conveyance roller unit 20-3 is similarly conveyed downstream from the third paper conveyance roller unit 20-3 by the third paper conveyance roller unit 20-3.
- the first to third drive rollers 21-1 to 21-3 are rotated in the reverse direction (counterclockwise in the above example) by the drive unit, contrary to the above-described forward feed.
- the paper to be measured is conveyed from the downstream side to the upstream side.
- the main scanning direction (first direction) is the x direction (horizontal direction)
- the coordinate axis set along the x direction is the x axis
- the sub-scanning direction (second direction) is A y-axis (vertical direction) is set, and a coordinate axis set along the y-direction is set as a y-axis, and these are used as appropriate.
- the color measuring unit 3 is a device that is connected to the control processing unit 6 and measures the color of the object to be measured in accordance with the control of the control processing unit 6.
- the color measurement unit 3 is, for example, a color measurement sensor that acquires predetermined optical information in the measurement object in order to obtain the color of the measurement object.
- a colorimetric unit 3 includes, for example, a spectroscopic optical element, a photoelectric conversion element, and the like for measuring the reflectance (or transmittance) of each wavelength, and the object color is changed to the reflectance (or transmittance) of each wavelength. ) Based on the spectroscopic colorimeter.
- the colorimetric unit 3 includes an optical filter, a photoelectric conversion element, and the like for measuring RGB tristimulus values, and measures a color of an object based on a color difference of the tristimulus values. It is.
- the colorimetric unit 3 performs white calibration by measuring a so-called white calibration plate (standard white plate) that can reflect the wavelength in the measurement range with a high reflectance (for example, about 90% to about 99%).
- the main scanning direction moving unit 4 is connected to the control processing unit 6, and in accordance with the control of the control processing unit 6, the color measurement unit 3 is moved in the main scanning direction (first direction) by a predetermined unit conveyance command (first unit conveyance command). It is a moving mechanism which moves every predetermined amount.
- the main scanning direction moving unit 4 includes, for example, a guide member that guides the color measuring unit 3, and a feed mechanism such as a rack and pinion (rack and pinion) or a feed screw that is guided by the guide member and moves the color measuring unit 3. And a feed mechanism drive unit such as a stepping motor (main scanning stepping motor) for driving the feed mechanism. For example, as shown in FIG.
- the main scanning direction moving unit 4 is provided in a colorimetric unit 3 and a rack 31 cut into a flat rod extending along the main scanning direction.
- a pinion (not shown) that is rotationally driven by a stepping motor is provided, and the pinion and the rack 31 mesh with each other.
- the main scanning stepping motor receives a single driving pulse (a first driving pulse, an example of the first unit transport command), so that a predetermined driving pulse is input.
- the pinion is also rotated by a predetermined angle (a twelfth angle) by the rotation of the main scanning stepping motor, and the colorimetric unit 3 is rotated by the rotation of the pinion. Then, it is moved along the rack 31 by a predetermined amount in the main scanning direction.
- the imaging unit 5 is an apparatus that is connected to the control processing unit 6 and captures an optical image of an object under the control of the control processing unit 6.
- the imaging unit 5 includes, for example, a line sensor (linear image sensor) in which a plurality of photoelectric conversion elements are arranged along one direction, and as illustrated in FIG. 3, the arrangement direction of the plurality of photoelectric conversion elements.
- the one direction is aligned with the main scanning direction (x direction) so as to extend along the main scanning direction (x direction).
- CM since the imaging unit 5 includes a line sensor, for example, when an area sensor including an imaging optical system is used for the imaging unit 5, distortion of a peripheral image that may be caused by the imaging optical system is reduced. There is no need to consider.
- the imaging unit 5 is disposed between the first paper transport roller unit 20-1 and the second paper transport roller unit 20-2, and the colorimetric unit 3 and the main scanning direction are arranged.
- the moving unit 4 is arranged so that the color measuring unit 3 moves along the main scanning direction between the second paper transport roller unit 20-2 and the third paper transport roller unit 20-3.
- the image pickup unit 5 picks up the paper to be measured for each line along the main scanning direction (x direction) while conveying the paper to be measured in the sub scanning direction (y direction) by the sub scanning direction moving unit 2. Thus, a paper image (image data) of the object to be measured is generated.
- the relative position y between the paper to be measured and the colorimetric unit 3 in the sub-scanning direction can be changed.
- the color measuring unit 3 By moving the color measuring unit 3 itself in the main scanning direction (x direction) by the main scanning direction moving unit 4, the relative position x between the paper of the object to be measured and the color measuring unit 3 in the main scanning direction can be changed. Thereby, the color measuring unit 3 can move to an arbitrary position (x, y) on the paper of the object to be measured, and can measure the color at the position (x, y).
- the input unit 7 is connected to the control processing unit 6 and, for example, various commands such as a command for instructing colorimetry of the object to be measured, and various types necessary for colorimetry such as input of an identifier in the object to be measured, for example.
- a device that inputs data to the color measurement device CM such as a plurality of input switches assigned with predetermined functions.
- the output unit 8 is connected to the control processing unit 6 and outputs commands and data input from the input unit 7 and the color of the measurement object measured by the color measurement device CM according to the control of the control processing unit 6.
- a display device such as a CRT display, an LCD, and an organic EL display, a printing device such as a printer, and the like.
- a touch panel may be configured from the input unit 7 and the output unit 8.
- the input unit 7 is a position input device that detects and inputs an operation position such as a resistive film method or a capacitance method
- the output unit 8 is a display device.
- a position input device is provided on the display surface of the display device, one or more input content candidates that can be input to the display device are displayed, and the user touches the display position where the input content to be input is displayed. Then, the position is detected by the position input device, and the display content displayed at the detected position is input to the color measurement device CM as the operation input content of the user.
- the color measurement device CM that is easy for the user to handle is provided.
- the IF unit 9 is a circuit that is connected to the control processing unit 6 and inputs / outputs data to / from an external device according to the control of the control processing unit 6, for example, an interface circuit of RS-232C that is a serial communication system
- the storage unit 10 is a circuit that is connected to the control processing unit 6 and stores various predetermined programs and various predetermined data under the control of the control processing unit 6.
- the various predetermined programs include a color measurement program for measuring the color of the object to be measured, and a position for obtaining each position of each patch in the color chart CT when the object to be measured is the color chart CT.
- a control processing program such as a measurement program and a relative position measurement program for obtaining information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 is included.
- the various predetermined data includes the backlash amount obtained by the control processing unit 6 as described later.
- the storage unit 10 includes, for example, a ROM (Read Only Memory) that is a nonvolatile storage element, an EEPROM (Electrically Erasable Programmable Read Only Memory) that is a rewritable nonvolatile storage element, and the like.
- the storage unit 10 includes a RAM (Random Access Memory) that serves as a working memory of the so-called control processing unit 6 that stores data generated during execution of the predetermined program.
- the control processing unit 6 is a circuit for controlling each unit of the color measurement device CM according to the function of each unit and determining the color of the object to be measured.
- the control processing unit 6 includes, for example, a CPU (Central Processing Unit) and its peripheral circuits.
- the control processing unit 6 includes a control unit 61, a calibration amount processing unit 62, a position processing unit 63, and a color measurement processing unit 64 that are functionally configured by executing a control processing program.
- the control unit 61 is for controlling each unit of the color measurement device CM according to the function of each unit.
- the calibration amount processing unit 62 acquires the image of the relative position calibration chart PCT by the imaging unit 5, measures the color of the relative position calibration chart PCT by the color measurement unit 3, and acquires the relative position calibration chart acquired by the imaging unit 5. Based on the calibration feature in the PCT image and the calibration feature in the colorimetric result of the relative position calibration chart PCT measured by the colorimetric unit 3, information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 Is what you want.
- the relative position calibration chart PCT is a chart used to obtain information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5, and is in the main scanning direction (first direction, x direction) and sub-scanning direction (first direction). It is a chart on which a calibration figure having a predetermined calibration feature capable of detecting at least two positions along at least one of the two directions and the y direction) is drawn.
- the calibration amount processing unit 62 includes a main scanning direction calibration amount processing unit 621 that obtains first relative positional relationship information in the main scanning direction, and a relative positional relationship in the sub scanning direction. 2 is functionally provided with a sub-scanning direction calibration amount processing unit 622 for obtaining information.
- the relative position calibration chart PCT is also used in the main scanning direction relative position calibration chart PhCT for obtaining the first relative positional relationship information in the main scanning direction and the second relative positional relationship information in the sub scanning direction.
- a sub-scanning direction relative position calibration chart PvCT for obtaining.
- the main scanning direction calibration amount processing unit 621 obtains an image of the main scanning direction relative position calibration chart PhCT by the imaging unit 5 and measures the color of the main scanning direction relative position calibration chart PhCT by the color measurement unit 3. 5 based on the calibration feature in the image of the main scanning direction relative position calibration chart PhCT acquired by 5 and the calibration feature in the color measurement result of the main scanning direction relative position calibration chart PhCT measured by the colorimetric unit 3. First information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 is obtained in the main scanning direction.
- the sub-scanning direction calibration amount processing unit 622 acquires an image of the sub-scanning direction relative position calibration chart PvCT by the imaging unit 5, and measures the color of the sub-scanning direction relative position calibration chart PvCT by the color measuring unit 3. Based on the image of the sub-scanning direction relative position calibration chart PvCT acquired by 5 and the color measurement result of the sub-scanning direction relative position calibration chart PvCT measured by the color measurement unit 3, the color measurement unit 3 in the sub-scanning direction. And second information on the relative positional relationship between the imaging unit 5 and the imaging unit 5 is obtained.
- the position processing unit 63 acquires an image of the color chart CT, which is one of the objects to be measured, by the imaging unit 5, and obtains each position of the plurality of patches based on the acquired image of the color chart CT.
- the imaging unit 5 includes a line sensor or the like
- the position processing unit 63 captures the color chart CT while transporting the color chart CT by the sub-scanning direction moving unit (paper transport unit) 2.
- the image of the color chart CT is acquired by imaging at 5, and the positional deviation amount of the color chart CT is obtained based on the acquired image of the color chart CT.
- the position processing unit 63 performs horizontal processing by binarizing the image of the color chart CT using, for example, an edge filter used to detect edges extending in one direction in the image.
- Binary horizontal edge image data and binary vertical edge image data are generated for each of (main scanning direction, x direction) and vertical direction (sub-scanning direction, y direction), and these generated binary horizontal edge image data.
- the horizontal edge lines and the vertical edge lines are detected in the horizontal and vertical directions by further Hough transforming each of the binarized vertical edge image data, and the intersections of these intermediate lines are used as the positions of the patches. It is what you want.
- the color measurement processing unit 64 uses each position of the plurality of patches obtained by the position processing unit 63 based on the information on the relative positional relationship obtained by the calibration amount processing unit 62 and each position measured by the color measurement unit 3.
- the colorimetric unit 3 measures the color of each of the plurality of patches.
- the color measurement device CM acquires an image of the relative position calibration chart PCT by the imaging unit 5, measures the color of the relative position calibration chart PCT by the color measurement unit 3, and acquires the relative position acquired by the imaging unit 5.
- a calibration amount processing step for obtaining the information a position processing step for obtaining an image of the color chart CT by the imaging unit 5 and obtaining each position of the plurality of patches based on the obtained image of the color chart CT, and a calibration amount processing
- the positions of the plurality of patches obtained in the position processing step and the positions measured by the colorimetric unit 3 are corrected, and the plurality of positions are corrected.
- the position processing step and the calibration amount processing step need to be executed before the color measurement processing step.
- each step will be described more specifically in the order of the calibration amount processing step, the position processing step, and the color measurement processing step.
- FIG. 5 is a flowchart illustrating the operation of the color measurement device according to the embodiment when the first information of the relative positional relationship between the imaging unit and the color measurement unit in the main scanning direction is actually measured.
- FIG. 6 is a diagram for describing the first information on the relative positional relationship between the imaging unit and the colorimetric unit in the main scanning direction.
- FIG. 7 is a diagram illustrating an example of actually measuring the first information of the relative positional relationship between the imaging unit and the color measurement unit in the main scanning direction, and an example of each image based on each data obtained by the imaging unit and the color measurement unit. .
- FIG. 5 is a flowchart illustrating the operation of the color measurement device according to the embodiment when the first information of the relative positional relationship between the imaging unit and the color measurement unit in the main scanning direction is actually measured.
- FIG. 6 is a diagram for describing the first information on the relative positional relationship between the imaging unit and the colorimetric unit in the main scanning direction.
- FIG. 7 is a diagram illustrating an example of
- FIG. 7A shows a state in which the first information of the relative positional relationship between the imaging unit 5 and the colorimetric unit 3 in the main scanning direction is actually measured.
- FIG. 7B shows an example of an image based on data obtained by the imaging unit 5.
- FIG. 7C shows an image extracted from the image of FIG. 7B at the same position as the colorimetric unit 3.
- FIG. 8 is a diagram illustrating data obtained by the imaging unit and the colorimetry unit as an example in the main scanning direction.
- FIG. 8A shows data based on data obtained by the imaging unit 5, and the horizontal axis represents each pixel position i of the imaging unit 5 along the main scanning direction, and the vertical axis represents each pixel position i.
- the integrated value vecCIS (i) is obtained by integrating the pixel values in the imaging unit 5 from Y1 to Y2 along the sub-scanning direction.
- the left end of the paper on the horizontal axis is the first pixel at one end of the imaging unit 5.
- FIG. 8B shows data obtained by the color measuring unit 3, and the horizontal axis is given to the main scanning stepping motor of the main scanning direction moving unit 4 in order to move the color measuring unit 3 along the main scanning direction.
- the number j of the first drive pulses to be measured, and the vertical axis thereof represents the color measurement value (color measurement result) vecColor of the color measurement unit 3.
- FIG. 9 is a diagram illustrating a relationship between an edge position based on data obtained by the colorimetric unit and an edge position based on data obtained by the imaging unit in the main scanning direction.
- the horizontal axis in FIG. 9 is the edge position X pulse based on the data obtained in the colorimetric unit, and the vertical axis is the edge position X CIS based on the data obtained in the imaging unit.
- FIG. 10 is a diagram for explaining an intermediate position that can be used instead of the edge position.
- FIG. 11 is a flowchart illustrating the operation of the color measurement device according to the embodiment when the second information on the relative positional relationship between the imaging unit and the color measurement unit in the sub-scanning direction is actually measured.
- FIG. 9 is a diagram illustrating a relationship between an edge position based on data obtained by the colorimetric unit and an edge position based on data obtained by the imaging unit in the main scanning direction.
- the horizontal axis in FIG. 9 is the edge position X pulse based on the data obtained in
- FIG. 12 is a diagram for describing the second information on the relative positional relationship between the imaging unit and the colorimetric unit in the sub-scanning direction.
- FIG. 13 is a diagram illustrating an example of actually measuring the second information of the relative positional relationship between the imaging unit and the color measurement unit in the sub-scanning direction, and an example of each image based on each data obtained by the imaging unit and the color measurement unit. .
- FIG. 13A shows a state in which the second information of the relative positional relationship between the imaging unit and the colorimetric unit in the sub-scanning direction is measured
- FIG. 13B shows an example of an image based on data obtained by the imaging unit 5
- FIG. 13B shows an image extracted from the image at the same position as the colorimetric unit 3 in the image of Fig. 13B.
- FIG. 14 is a diagram illustrating data obtained by the imaging unit and the colorimetry unit as an example in the sub-scanning direction.
- FIG. 14A shows data based on data obtained by the imaging unit 5, and the horizontal axis thereof is for sub-scanning of the sub-scanning direction moving unit 2 in order to move the relative position calibration chart PCT along the sub-scanning direction.
- the number m of the second drive pulses given to the stepping motor is the vertical axis, and the vertical axis indicates the integrated value horCIS obtained by integrating each pixel value in the imaging unit 5 from X1 to X2 along the main scanning direction for each pulse number.
- FIG. 14B shows data obtained by the colorimetric unit 3, and the horizontal axis represents the sub-scanning stepping motor of the sub-scanning direction moving unit 2 in order to move the relative position calibration chart PCT along the sub-scanning direction. Is the number m of the second driving pulses given, and the vertical axis represents the colorimetric value (colorimetry result) horColor of the colorimetric unit 3.
- FIG. 15 is a diagram illustrating the relationship between the edge position in the sub-scanning direction based on the data obtained by the color measurement unit and the edge position in the sub-scanning direction based on the data obtained by the imaging unit at each color measurement position.
- FIG. 15 is the position X pulse of the color measuring unit 3, and the vertical axis is the interval L 0 between the edge position obtained by the color measuring unit 3 and the edge position based on the data obtained by the imaging unit 5. is there.
- FIG. 16 is a diagram for explaining an intermediate position that can be used instead of the edge position.
- Information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 is information indicating the arrangement position in the other direction with one as a reference, and information on each movement amount of the colorimetric unit 3 and the imaging unit 5 per unit command.
- the arrangement position can be represented by a position in the main scanning direction (first direction, x direction) and a position in the sub scanning direction (second direction, y direction).
- Each movement amount per unit command is related to the movement amount of the color measurement unit 3 and its measurement when the color measurement unit 3 is moved in the main scanning direction by one pulse of the first drive pulse in the main scanning direction.
- the calibration amount processing step generally includes a main scanning direction calibration amount processing step for obtaining first information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the main scanning direction, and a colorimetric unit in the sub-scanning direction. 3 and a sub-scanning direction calibration amount processing step for obtaining the second information of the relative positional relationship between the imaging unit 5 and the imaging unit 5.
- the color measuring unit 3 is moved from the home position HP by the main scanning direction moving unit 4 to the main scanning direction moving unit. 4 moves in the main scanning direction in proportion to the number of first drive pulses applied to the first pulse motor.
- the imaging unit 5 each pixel is arranged along the main scanning direction.
- the arrangement position of the imaging unit 5 is used as a reference.
- the x coordinate value of the home position HP of the color measuring unit 3 is the distance between the home position HP of the color measuring unit 3 and one end of the imaging unit 5 along the scanning direction.
- the data representing how many pixels of the imaging unit 5 corresponds to the amount of movement of the color measurement unit 3 by the first drive pulse of one pulse is the number of pixels of the imaging unit 5 per unit movement amount of the color measurement unit 3 As required.
- the colorimetric unit 3 and the imaging unit 5 are fixed, and the sub-scanning direction moving unit (paper transport) Part) 2 moves the predetermined paper (for example, relative position calibration chart PCT, color chart CT, etc.), and the positional relationship between the colorimetric part 3 and the imaging part 5 and the predetermined paper changes.
- the predetermined paper moves in the sub-scanning direction in proportion to the number of second drive pulses applied to the second pulse motor in the sub-scanning direction moving unit 2.
- the number of pulses of the second drive pulse that moves the predetermined paper by the distance between the colorimetric unit 3 and the imaging unit 5 along the sub-scanning direction is the relative positional relationship. It is calculated
- the main scanning direction calibration amount processing unit 621 of the calibration amount processing unit 62 moves the color measurement unit 3 to the home position HP (S10).
- the home position HP is a standby position of the color measuring unit 3 and is one end in the movable range of the color measuring unit 3 as shown in FIG.
- the color measuring unit 3 is moved to the home position HP by being moved by the main scanning direction moving unit 4 until the color measuring unit 3 cannot move due to the so-called mechanical contact, for example.
- the main scanning direction relative position calibration chart PhCT is a chart used for obtaining first information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5, and is in the main scanning direction (first direction, x direction). It is a chart in which a calibration figure FGh having a predetermined calibration feature capable of detecting at least two positions along the drawing is drawn. More specifically, for example, as shown in FIG. 7, the main scanning direction relative position calibration chart PhCT is formed on a plain sheet in the sub-scanning direction (second direction, y direction) as the calibration figure FGh. It is a chart in which a plurality of long squares (vertical bar figures) FGh are drawn in parallel along the main scanning direction. In the example shown in FIG. 7, seven squares FGh-1 to FGh-7 are drawn. Thus, the main scanning direction relative position calibration chart PhCT can be easily created simply by drawing the square FGh that is long in the sub-scanning direction as the calibration graphic FG.
- the main scanning direction calibration amount processing unit 621 acquires data of the main scanning direction relative position calibration chart PhCT (S11). More specifically, the main scanning direction calibration amount processing unit 621, for example, has a preset length (for example, from position Y1 to position Y2) along the sub-scanning direction in forward feed, and the main scanning direction along the main scanning direction. An image of the relative position calibration chart PhCT is acquired by the imaging unit 5. More specifically, the main scanning direction calibration amount processing unit 621 sequentially feeds the main scanning direction relative position calibration chart PhCT by the sub-scanning direction moving unit 2, from a preset position Y1 to a position Y2 along the sub-scanning direction.
- the imaging unit 5 captures the main scanning direction relative position calibration chart PhCT for each line along the main scanning direction (x direction) in synchronization with the transport in the sub-scanning direction.
- an image of the main scanning direction relative position calibration chart PhCT is acquired.
- the main scanning direction calibration amount processing unit 621 performs the main scanning direction relative position calibration chart PhCT in the same range as the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5 along the main scanning direction. Color measurement is performed by the color measuring unit 3.
- the main-scanning direction calibration amount processing unit 621 generates the main-scanning-direction relative position calibration chart PhCT so as to be in the same range as the image of the main-scanning-direction relative position calibration chart PhCT acquired by the imaging unit 5.
- the sub-scanning direction moving unit 2 carries the sheet along the sub-scanning direction, and the main scanning direction moving unit 4 moves the color measuring unit 3 from the home position HP, which is one end of the movable range, to the other end of the movable range.
- the color measurement result of the main scanning direction relative position calibration chart PhCT is obtained.
- the main scanning direction relative position calibration chart PhCT along the sub-scanning direction for measuring the same range as the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5 with the color measuring unit 3.
- the distance between the imaging unit 5 and the colorimetric unit 3 along the sub-scanning direction is designed. It is executed using a value or the like.
- FIG. 7B shows, as an example, an image of the main-scanning direction relative position calibration chart PhCT including the range from the position Y1 to the position Y2 acquired by the imaging unit 5, and FIG. 7C shows the image of FIG. 7B.
- An image excerpting the range from the position Y1 to the position Y2 is shown.
- an image of the main scanning direction relative position calibration chart PhCT is acquired in a range beyond the range from the position Y1 to the position Y2.
- the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5 in the above-described processing S ⁇ b> 11 only needs to include the range of color measurement by the color measurement unit 3.
- the main scanning direction relative position calibration chart PhCT may be measured by the colorimetric unit 3 within a range included in the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5.
- the main scanning direction calibration amount processing unit 621 detects the position of the edge of the calibration graphic FGh from the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5 (S12). More specifically, the main scanning direction calibration amount processing unit 621 is configured to display each pixel from the position Y1 to the position Y2 along the y direction in the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5.
- the vertical edge graph data by the imaging unit 5 is generated by integrating the pixel values.
- FIG. 8A shows, as an example, vertical edge graph data vecCIS (i) generated by the imaging unit 5 for the image of the main scanning direction relative position calibration chart PhCT shown in FIG. 7C.
- the vertical edge graph data vecCIS (i) generated by the imaging unit 5 thus generated, the position of the first vertical edge by the imaging unit 5 is detected.
- the main scanning direction calibration amount processing unit 621 detects the position of the edge of the calibration graphic FGh from the color measurement result of the main scanning direction relative position calibration chart PhCT measured by the color measuring unit 3 (S13). .
- FIG. 8B shows the color measurement result vecColor (j) of the main scanning direction relative position calibration chart PhCT shown in FIG. 7C as an example. In such a color measurement result vecColor (j) by the color measurement unit 3, the position of the second vertical edge by the color measurement unit 3 is detected.
- the main scanning direction calibration amount processing unit 621 obtains the first information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the main scanning direction based on the processing result of the processing S12 and the processing result of the processing S13.
- the first information of the calculated relative positional relationship is stored in the storage unit 9 (S14).
- the color measuring unit 3 moves from the home position HP in the main scanning direction (x direction) by a coordinate value proportional to the number of pulses of the first drive pulse given to the first pulse motor.
- the x coordinate value of the home position HP is X home and the color measurement unit 3 moves by ⁇ X pulse in one pulse
- the coordinate value X pulse (j of the color measurement unit 3 when the pulse number j is given from the home position. ) Is given by the following equation (2).
- the x-coordinate value X home of the home position HP is expressed by the following equation (3) from Equation (1).
- edge position of the calibration graphic FGh in the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5 is the I CIS- th pixel position.
- edge position of the calibration graphic FGh in the color measurement result data of the color measuring unit 3 is the pixel position of J pulse from the home position.
- the main scanning direction calibration amount processing unit 621 the processing S12 and step S13 the respective edge positions obtained in each of the vertical axis and the horizontal axis J pulse (k) Plot in the coordinate space defined as I CIS (k), find a straight line that best fits each edge position by the least square method, find the y-intercept of this straight line as I home , and calculate the slope of the straight line the ⁇ X pulse / ⁇ X obtained as CIS.
- each edge position obtained from FIGS. 8A and 8B is plotted ( ⁇ ), and a straight line that best fits each edge position by the least square method is shown.
- Each of the 14 edge positions ( ⁇ ) shown in order from left to right in FIG. 9 corresponds to the edge positions at both ends in the main scanning direction in each of the seven calibration figures FGh-1 to FG-7.
- the main scanning direction calibration amount processing step is executed, and the main scanning direction calibration amount processing unit 621 performs the color measurement unit 3 and the imaging unit 5 in the main scanning direction. First information of the relative positional relationship is obtained.
- the position of the first vertical edge by the imaging unit 5 and the position of the second vertical edge by the colorimetric unit 3 are used.
- an intermediate position (first vertical intermediate position) between adjacent first vertical edges is used.
- an intermediate position between second vertical edges adjacent to each other (second vertical intermediate position) may be used.
- the main scanning direction calibration amount processing unit 621 detects a plurality of edges of the calibration graphic FGh as first vertical edges based on the image of the main scanning direction relative position calibration chart PhCT acquired by the imaging unit 5, and performs colorimetry.
- a plurality of edges of the calibration graphic FGh are detected as second vertical edges based on the color measurement results of the main-scanning direction relative position calibration chart PhCT measured by the unit 3, and the first edges between the detected first vertical edges are detected.
- First information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 is obtained based on one intermediate position and the second intermediate position between the detected second vertical edges.
- the first and second intermediate positions are the vertical edge graph data vecCIS (i) and the color measurement result vecColor (j) of the main scanning direction relative position calibration chart PhCT by the color measurement unit 3, respectively. Is obtained as an intermediate position ( ⁇ or ⁇ ) of the coordinates (x) crossing a predetermined threshold value (third threshold value, for example, half value of peak) th3.
- the first information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the main scanning direction is determined along the main scanning direction from the home position HP to the other end of the movable range of the colorimetric unit 3.
- required about the case where it moved it may be calculated
- the sub-scanning direction calibration amount processing step of the calibration amount processing step is a step of obtaining the second information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the sub-scanning direction as described above.
- the relative positional relationship between the color measuring unit 3 and the imaging unit 5 in the sub-scanning direction may be obtained at any one position along the main scanning direction. For example, as shown in FIG. Due to an attachment error of the image pickup unit 5 that is long along the scanning direction, the movement locus of the color measurement unit 3 moving along the main scanning direction and the image pickup unit 5 are not parallel to each other, and the image pickup unit 5 is not connected to the color measurement unit. 3 may be inclined with respect to the movement trajectory.
- the distance between the color measurement unit 3 and the imaging unit 5 in the sub-scanning direction is different at each position along the main scanning direction.
- the second information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the sub-scanning direction is obtained at a plurality of locations along the main scanning direction. More specifically, in the sub-scanning direction calibration amount processing step, the following processes are executed.
- the sub-scanning direction relative position calibration chart PvCT is set in the paper feed unit 1 and the start of calibration is instructed from the input unit 7, first, the sub-scan of the calibration amount processing unit 62 is performed as shown in FIG.
- the direction calibration amount processing unit 622 acquires data of the sub-scanning direction relative position calibration chart PvCT (S21). More specifically, the sub-scanning direction calibration amount processing unit 622 is for correcting the relative position in the sub-scanning direction by a predetermined length so as to include the calibration graphic FGv along the sub-scanning direction, for example.
- An image of the chart PvCT is acquired by the imaging unit 5.
- the sub-scanning direction calibration amount processing unit 622 sequentially feeds the sub-scanning direction relative position calibration chart PvCT by the sub-scanning direction moving unit 2 in advance along the sub-scanning direction so as to include the calibration figure FGv. While transporting from a certain set position to another certain position in the sub-scanning direction, in synchronization with the transport in the sub-scanning direction (every second driving pulse of one pulse), the main scanning direction (x direction) ), the sub-scanning direction relative position calibration chart PvCT is imaged by the imaging unit 5 for each line along the line) to obtain an image of the sub-scanning direction relative position calibration chart PvCT.
- the sub-scanning direction calibration amount processing unit 622 outputs the sub-scanning direction relative position calibration chart PvCT at each of a plurality of preset positions with a predetermined interval along the main scanning direction.
- To measure the color That is, an image for one line is captured by the imaging unit 5 while conveying the chart PvCT for relative position calibration in the sub-scanning direction one pulse at a time, and the color measurement unit 3 performs color measurement at that position, and the imaging unit 5 performs imaging and measurement. The color measurement by the color unit 3 is performed simultaneously.
- the sub-scanning direction relative position calibration chart PvCT is a chart used for obtaining the second information of the relative positional relationship between the colorimetric unit 3 and the imaging unit 5, and is in the sub-scanning direction (second direction, y direction). It is a chart on which a calibration figure FGv having a predetermined calibration feature whose position can be detected along is drawn. More specifically, for example, as shown in FIG. 13, the sub-scanning direction relative position calibration chart PvCT is formed on a plain paper in the main scanning direction (first direction, x direction) as the calibration figure FGv. It is a chart in which a long square (horizontal bar graphic) FGv is drawn. In this way, the sub-scanning direction relative position calibration chart PvCT can be easily created simply by drawing the square FGv that is long in the main scanning direction as the calibration graphic FG.
- FIG. 13B shows, as an example, an image of the sub-scanning direction relative position calibration chart PvCT acquired by the imaging unit 5, and FIG. 13C shows an area from X1 to X2 extracted from the image of FIG. 13B. An image is shown.
- FIG. 13B also shows a range from the position X1 to the position X2 in the image of the sub-scanning direction relative position calibration chart PvCT.
- the second information on the relative positional relationship between the color measurement unit 3 and the imaging unit 5 in the sub-scanning direction is obtained at a plurality of locations along the main scanning direction. This is a range from the position X1 to the position X2.
- the position on the image of the sub-scanning direction relative position calibration chart PvCT acquired by the imaging unit 5 corresponding to a plurality of locations where the colorimetric unit 3 performs color measurement (in the example shown in FIG. 13B, the position from the position X1 In the range up to X2)
- the distance along the main scanning direction between the imaging unit 5 and the color measurement unit 3 is acceptable. It is calculated
- the first information of the relative positional relationship obtained by the above-described main scanning direction calibration amount processing step may be used.
- the sub-scanning direction calibration amount processing unit 622 is used for correcting the relative position in the sub-scanning direction acquired by the imaging unit 5 at each of the plurality of locations set in advance at predetermined intervals along the main scanning direction.
- the position of the edge of the calibration graphic FGv is detected from the image of the chart PvCT (S22). More specifically, for example, in the range from the position X1 to the position X2 in the above-described example, the sub-scanning direction calibration amount processing unit 622 is included in the image of the sub-scanning direction relative position calibration chart PvCT acquired by the imaging unit 5.
- horizontal edge graph data horCIS (m) generated by the imaging unit 5 is generated for the range from position X1 to position X2 in the image of the sub-scanning direction relative position calibration chart PvCT shown in FIG. 13B. )It is shown.
- the position of the first horizontal edge is detected from the horizontal edge graph data horCIS (m).
- Such processing is executed at each of the plurality of locations set in advance at predetermined intervals along the main scanning direction.
- the sub-scanning direction calibration amount processing unit 622 is configured to measure the relative position in the sub-scanning direction measured by the colorimetric unit 3 at each of the plurality of preset positions with a predetermined interval along the main scanning direction.
- the position of the edge of the calibration graphic FGv is detected from the color measurement result of the calibration chart PvCT (S23).
- FIG. 14B shows, as an example, a color measurement result horColor (m) of the sub-scanning direction relative position calibration chart PvCT in the range from the position X1 to the position X2 shown in FIG. 13B.
- the position of the second horizontal edge is detected from the color measurement result horColor (m) by such a color measurement unit 3.
- Such processing is executed at each of the plurality of locations set in advance at predetermined intervals along the main scanning direction.
- the sub-scanning direction calibration amount processing unit 622 obtains second information on the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the sub-scanning direction based on the processing result of the processing S22 and the processing result of the processing S23. Calculate (S24).
- the colorimetric unit 3 uses the difference between the first horizontal edge position obtained by the imaging unit 5 obtained in step S22 and the second horizontal edge position obtained by the colorimetric unit 3 obtained in step S23.
- the interval L 0 (k) in the sub-scanning direction between the colorimetric unit 3 and the imaging unit 5 at a certain point x X pulse (k), that is, a sub-scanning direction relative position calibration chart PvCT
- the number of second drive pulses applied to the sub-scanning stepping motor of the sub-scanning direction moving unit 2 required to move the position from the position of the imaging unit 5 to the position of the colorimetric unit 3 is obtained.
- the following expression (7) is established between the plurality of locations X pulse (k) and the interval L 0 (k). ) Holds.
- the sub-scanning direction calibration amount processing unit 622 performs the processing at each of the plurality of locations X pulse (k) set in advance at predetermined intervals along the main scanning direction.
- the intervals L 0 (k) are obtained from the respective edge positions obtained in the processing S22 and the processing S23, respectively, and the respective intervals L 0 (k) are set at predetermined intervals along the main scanning direction on the horizontal axis.
- the intervals L 0 (k) at the plurality of locations X pulse (k) obtained from FIGS. 14A and 14B are plotted ( ⁇ ), and the intervals L 0 ( A straight line that fits best is shown in k).
- the five intervals L 0 (k) shown in order from the left to the right in FIG. 15 correspond to the five locations shown in FIG. 13A.
- the sub-scanning direction calibration amount processing step is executed, and the sub-scanning direction calibration amount processing unit 622 performs the color measurement unit 3 and the imaging unit 5 in the sub-scanning direction.
- the second information of the relative positional relationship is obtained.
- the position of the first horizontal edge by the imaging unit 5 and the position of the second horizontal edge by the colorimetric unit 3 are used.
- an intermediate position (first horizontal intermediate position) between the adjacent first horizontal edges is used.
- an intermediate position between second horizontal edges adjacent to each other may be used.
- the sub-scanning direction calibration amount processing unit 622 detects a plurality of edges of the calibration graphic FGv as first horizontal edges based on the image of the sub-scanning direction relative position calibration chart PvCT acquired by the imaging unit 5, and performs colorimetry.
- the first and second intermediate positions are respectively the horizontal edge graph data horCIS (m) and the color measurement result horColor (m) of the sub-scanning direction relative position calibration chart PvCT by the color measurement unit 3. Is obtained as an intermediate position ( ⁇ ) of coordinates (x) crossing a predetermined threshold value (sixth threshold value, for example, half value of peak) th6.
- the second information regarding the relative positional relationship between the colorimetric unit 3 and the imaging unit 5 in the sub-scanning direction is the case where the sub-scanning direction relative position calibration chart PvCT is conveyed along the sub-scanning direction in the forward feed. Although it is obtained, it may also be obtained when the sub-scanning direction relative position calibration chart PvCT is conveyed along the sub-scanning direction by reverse feed.
- the deflection amount of the paper conveyed by the sub-scanning direction moving unit 2 varies depending on the paper conveyance direction, and as a result, the colorimetric unit 3 takes an image. Calibration is possible even when the number of paper feed pulses required for transporting the paper up to the section 5 differs depending on the paper transport direction.
- the main scanning direction calibration amount processing step shown in FIG. 5 is executed first, and the sub scanning direction calibration amount processing step shown in FIG. 11 is executed later, but the sub scanning direction calibration amount processing step shown in FIG. The process may be executed first, and the main scanning direction calibration amount processing step shown in FIG. 5 may be executed later.
- the calibration amount processing step both the main scanning direction calibration amount processing step shown in FIG. 5 and the sub-scanning direction calibration amount processing step shown in FIG. 11 are performed.
- the main scanning direction calibration amount processing step shown in FIG. 5 may be executed, the design value may be used without executing the sub-scanning direction calibration amount processing step shown in FIG.
- FIG. 17 is a flowchart illustrating the operation of the color measurement device according to the embodiment in the case of obtaining the position of each patch in the color chart.
- FIG. 18 is a diagram illustrating a color chart image as an example.
- FIG. 19 is a diagram showing measured positions (x) of the patches in the color chart shown in FIG.
- FIG. 20 is a diagram illustrating an example of a processing result obtained by processing an image at a certain position in the y direction with a difference filter at N difference intervals along the horizontal direction with respect to the color chart illustrated in FIG.
- the horizontal axis in FIG. 20 is the pixel number of the imaging unit 5 (that is, the position in the horizontal direction x), and the vertical axis is the difference value.
- FIG. 20 is the pixel number of the imaging unit 5 (that is, the position in the horizontal direction x), and the vertical axis is the difference value.
- FIG. 21 is a diagram showing a binarized vertical edge image of the color chart shown in FIG. 18 as an example.
- FIG. 22 is a diagram showing a part of the vertical edge line of the color chart shown in FIG. 18 as an example.
- FIG. 23 is a diagram showing a binarized horizontal edge image of the color chart shown in FIG. 18 as an example.
- FIG. 24 is a diagram showing a part of the horizontal edge line of the color chart shown in FIG. 18 as an example.
- FIG. 25 is a diagram showing a part of the position of each patch obtained from the vertical edge line and the horizontal edge line in the color chart shown in FIG. 18 as an example.
- a solid line indicates a vertical edge line or a horizontal edge line
- a broken line indicates an intermediate line between vertical edge lines or an intermediate line between horizontal edge lines
- ⁇ indicates the position of each measured patch (measured patch). Position).
- the color measurement device CM sequentially feeds the color chart CT.
- An entire image is acquired (S31). More specifically, the position processing unit 63 of the control processing unit 6 sequentially feeds the color chart CT by the sub-scanning direction moving unit 2, and sub-scans from one end to the other end of the patch area previously obtained by known conventional means.
- the color chart CT is imaged by the imaging unit 5 for each line along the main scanning direction (x direction) in synchronization with the conveyance in the sub-scanning direction while being conveyed in the scanning direction (y direction). An image of the chart CT is acquired.
- the patch area is an area where each patch exists.
- an image of a color chart CTa configured by arranging a plurality of rectangular patches shown in FIG. 18 in a two-dimensional array vertically and horizontally (two directions in the x and y directions orthogonal to each other). Is acquired.
- the color measurement device CM detects an edge by using a predetermined edge filter for the image of the color chart CT acquired in the process S31, and binarizes it, whereby the binarized edge image is detected.
- Image data (binarized edge image data) is generated (S32). More specifically, by operating as follows, based on the entire image of the color chart CT, image data of a binarized vertical edge image in which edges along the vertical direction (y direction) are represented by binary values ( The binarized vertical edge image data) and the image data of the binarized horizontal edge image (binarized horizontal edge image data) in which the edges along the horizontal direction (x direction) are represented by binary values are the position processing unit 63. Respectively.
- a difference is taken in the main scanning direction (horizontal direction, x direction).
- a difference filter of N difference intervals is used.
- FIG. 20 shows an example of a processing result obtained by processing an image at a certain position in the y direction with a difference filter at N difference intervals along the x direction with respect to the color chart shown in FIG.
- the absolute value of the processing result after such edge filter processing is obtained, and the obtained absolute value is compared with a preset threshold value (seventh threshold value) th7.
- a preset threshold value (seventh threshold value) th7.
- the absolute value is greater than or equal to the seventh threshold th7, it is set to 1, and when the absolute value is less than the seventh threshold th7, it is set to 0.
- the pixel value of each pixel is binarized, and binarized vertical edge image data is generated.
- binarized vertical edge image data may be generated by removing noise after binarization.
- the binarized horizontal edge image data is generated by performing the same processing as the generation of the binarized vertical edge image.
- binarized vertical edge image data pictVer0 (x, y) of the vertical edge image is generated.
- edge filter of Expression (9) and binarized for example, binarization shown in FIG. Binarized horizontal edge image data pictHor0 (x, y) of the horizontal edge image is generated.
- the color measuring device CM detects an edge line by performing straight line detection by so-called Hough transform on the binarized edge image data of the color chart CT generated in the process S32 (S33). More specifically, the binarized vertical edge image data and the binarized horizontal edge image data of the color chart CT are subjected to the Hough transform by the position processing unit 63, thereby detecting the vertical edge line and the horizontal edge line, respectively. Is done.
- the binarized vertical edge image data pictVer0 (x, y) in the binarized vertical edge image of the color chart CTa shown in FIG. 21 is subjected to the Hough transform, for example, the vertical edge line shown in FIG. 22 is detected.
- the binarized horizontal edge image data picTor0 (x, y) in the binarized horizontal edge image of the color chart CTa illustrated in FIG. 23 is subjected to the Hough transform, for example, the horizontal edge line illustrated in FIG. 24 is detected.
- the color measuring device CM obtains the position (x, y) of each patch based on the edge line generated in the processing S33 (S34), and this position processing step is completed. More specifically, first, the position processing unit 63 obtains a vertical intermediate line that is an intermediate line between adjacent vertical edge lines in each of the plurality of vertical edge lines. Next, the position processing unit 63 obtains a horizontal intermediate line that is an intermediate line between adjacent horizontal edge lines in each of the plurality of horizontal edge lines. Then, the position processing unit 63 obtains the intersections of the obtained plurality of vertical intermediate lines and the plurality of horizontal intermediate lines as the position (x, y) of each patch.
- the vertical intermediate line is obtained based on the vertical edge line obtained for the color chart CTa shown in FIG. 18, the vertical intermediate line shown by the broken line in FIG. 25 is obtained, and the horizontal intermediate line is obtained based on the horizontal edge line.
- a horizontal intermediate line indicated by a broken line in FIG. 25 is obtained, and an intersection point thereof is obtained as a position (x, y) of each patch as indicated by a circle in FIG.
- the positions of the patches in the entire color chart CTa shown in FIG. 18 are indicated by crosses in FIG.
- the color measurement processing unit 64 of the control processing unit 6 determines the position of the patch obtained as described above in the position processing step as the relative position obtained as described above in the calibration amount processing step.
- the color measurement unit 3 is aligned with the position of the patch by correcting the relationship information and moving the color measurement unit 3 by the main scanning direction moving unit 4 while transporting the color chart CT by the sub scanning direction moving unit 2.
- the color measurement unit 3 measures the color of the patch in the color chart CT. More specifically, with respect to the main scanning direction, the color measurement processing unit 64 converts the x coordinate of the patch position into the number of pulses of the first drive pulse according to the equation (6), and the color measurement unit 3 at the patch position. To move. Then, with respect to the sub-scanning direction, the color measurement processing unit 64 converts the y coordinate of the patch position into the number of pulses of the second drive pulse according to the equation (7), and moves the color chart CT to the patch position.
- the control unit 61 of the control processing unit 6 outputs each measured color of each patch to the output unit 8, The process ends. Note that the control unit 61 of the control processing unit 6 may output the measured colors of the patches to the IF unit 9 as necessary.
- the colorimetric apparatus CM and the colorimetric method implemented in the present embodiment associate the positional relationship between the colorimetric unit 3 and the imaging unit 5 using the information on the measured relative positional relationship. Therefore, the colorimetric unit 3 can be more appropriately aligned with the position of each patch based on the image of the color chart CT obtained by the imaging unit 5. Therefore, the color measurement device CM and the color measurement method implemented in this embodiment measure each patch at a more appropriate position by actually measuring information on the relative positional relationship between the imaging unit 5 and the color measurement unit 3. Can color.
- the relative position calibration chart PCT is prepared separately from the color chart CTa.
- the color chart CTb includes the calibration figure FG and includes the color chart CT.
- the relative position calibration chart PCT may also be used.
- FIG. 26 shows a case where the calibration graphic FG is a horizontal bar FGv, the calibration graphic FG may be a vertical bar FGh or the like as described above. Alternatively, the calibration graphic FG may be a horizontal bar FGv, a vertical bar FGh, or the like.
- the slip amount and the relative position calibration chart PCT when the color chart CT is transported by the sub-scanning direction moving section (paper transport section) 2. May be different from the amount of slip when the sub-scanning direction moving unit 2 is transported.
- the relative position calibration chart PCT is preferably created with the same paper quality as the color chart CT, or when it is created with a paper quality different from the color chart CT, it corresponds to the difference in the amount of slip. Correction is required.
- the slip amount according to the paper quality is measured in advance, and a correction value for correcting the information on the relative positional relationship with the slip amount due to the difference in paper quality is obtained in advance, and the paper quality of the color chart CT and the paper quality of the relative position calibration chart PCT Depending on the difference, for example, a correction value is selected and designated by the user, whereby the information on the relative positional relationship is corrected with the correction value.
- the color measurement device CM since the color chart CTb includes the calibration graphic FG, it is not necessary to consider the difference in slip amount due to the difference in paper quality. Further, the colorimetric apparatus CM does not need to prepare a relative position calibration chart PCT separately.
- the color measurement device CM includes the imaging unit 5 including a line sensor in which a plurality of photoelectric conversion elements are arranged along one direction.
- the imaging unit 50 may be configured to include an area sensor (two-dimensional image sensor) in which a plurality of photoelectric conversion elements are two-dimensionally arranged in two directions that are linearly independent from each other (for example, two directions orthogonal to each other).
- FIG. 27 is a diagram illustrating a schematic configuration of a color measurement device according to a modification in the case where the imaging unit is an area sensor.
- the chart In the line sensor, in order to acquire the entire image of the chart such as the color chart CT and the relative position calibration chart PCT, the chart is arranged in a direction (sub-scanning direction) orthogonal to the longitudinal direction (main scanning direction) of the line sensor. It is necessary to carry as mentioned above. For this reason, in the line sensor, there is a possibility that the chart slips during the conveyance, and as a result, when correcting each position of each patch with the information on the relative positional relationship, it is necessary to consider this slip.
- the imaging unit 50 configured to include such an area sensor or the like can capture the entire image of the chart without conveying the chart as described above.
- the color measurement device CM may be configured so that the color measurement unit 3 can perform two-dimensional scanning on the color chart CT.
- the color measuring device CM may include a moving unit that can move the color measuring unit 3 in the main scanning direction (x direction) and the sub scanning direction (y direction).
- a stage on which the color chart CT is mounted and movable in the main scanning direction (x direction) and the sub scanning direction (y direction) may be provided.
- the color measurement unit 3 may be configured to be movable in one of the main scanning direction and the sub-scanning direction, and the stage may be configured to be movable in the other direction.
- a long square (vertical bar graphic) FGh is drawn in the sub-scanning direction as the calibration graphic FGh, and the sub-scanning direction is drawn.
- a long square (horizontal bar figure) FGv is drawn in the main scanning direction as the calibration figure FGv.
- This ⁇ X image is the pixel size (pixel size) of the area sensor.
- the edge position based on the image of the relative position calibration chart PCT acquired by the imaging unit 50 and the relative position calibration obtained by moving the stage are used. From the edge position based on the color measurement result of the chart PCT, the b and the a in the equation (7) are obtained in the same manner as described above.
- the color measuring device CM includes the paper feeding unit 1, the sub-scanning direction moving unit (paper transport unit) 2, the color measuring unit 3, the main scanning direction moving unit 4, the imaging unit 5, and the control processing unit. 6, the input unit 7, the output unit 8, the IF unit 9, and the storage unit 10 are integrally provided.
- the color measurement device CM includes at least a color measurement unit 3, a main scanning direction moving unit 4, a sub scanning direction moving unit (paper transport unit) 2 and an imaging unit 5 that are integrally configured as a color measuring unit. You may further provide the memory
- the information on the measured relative positional relationship is information unique to the colorimetric unit 3 and the imaging unit 5.
- the color measurement unit including the color measurement unit 3 and the imaging unit 5 further includes the storage unit that stores the information on the relative positional relationship. And the information on the measured relative positional relationship can be set, and such a colorimetric device CM is less likely to be mistaken for information on the relative positional relationship between other colorimetric units and the imaging unit.
- a color measurement device includes a color measurement unit that measures a color, a moving unit that moves the color measurement unit along a predetermined first direction, and a second paper that is orthogonal to the first direction.
- a calibration figure having a predetermined calibration feature capable of detecting a position along at least one of the first and second directions, a conveyance unit that conveys the image along the direction, an imaging unit that acquires an image, and In the image of the relative position calibration chart acquired by the imaging unit, the image of the relative position calibration chart in which is drawn is acquired by the imaging unit, the color of the relative position calibration chart is measured by the colorimetric unit, Based on the predetermined calibration feature and the predetermined calibration feature in the color measurement result of the relative position calibration chart measured by the color measurement unit, the relative positional relationship between the color measurement unit and the imaging unit is determined.
- Calibration amount to obtain information And a position processing unit that acquires an image of a color chart including a plurality of patches that are regions of a predetermined color by the imaging unit, and obtains each position of the plurality of patches based on the acquired image of the color chart And each position measured by the colorimetric unit, which is each position of the plurality of patches obtained by the position processing unit, based on the information on the relative positional relationship obtained by the calibration amount processing unit.
- a color measurement processing unit that measures the color of each of the plurality of patches by the color measurement unit.
- the information on the relative positional relationship between the colorimetric unit and the imaging unit includes the calibration feature in the image of the relative position calibration chart obtained by the imaging unit and the relative position obtained by the colorimetric unit. Measured based on the calibration feature in the colorimetric result of the calibration chart. For this reason, since such a colorimetric device associates the positional relationship between the colorimetric unit and the imaging unit using the information on the measured relative positional relationship, the color chart image obtained by the imaging unit is associated with the color chart image. The colorimetric unit can be more appropriately aligned with the position of each patch based. Therefore, such a colorimetric device can measure the color of each patch at a more appropriate position by actually measuring information on the relative positional relationship between the imaging unit and the colorimetric unit.
- the calibration graphic of the relative position calibration chart is a rectangle that is long in one direction.
- the predetermined detection feature is an edge of the calibration graphic.
- the predetermined detection feature is an intermediate point of an edge of the calibration graphic.
- the color chart includes the calibration figure.
- the relative position calibration chart is preferably created with the same paper quality as the color chart, or when it is created with a paper quality different from the color chart, correction according to the difference in the amount of slip is necessary. It becomes.
- the colorimetric apparatus since the color chart includes the calibration graphic, it is not necessary to consider the difference in the slip amount due to the difference in paper quality. Further, the colorimetric apparatus does not need to prepare a relative position calibration chart separately.
- the imaging unit includes a line sensor.
- an Elisa sensor including an imaging optical system distortion may occur around the image due to the aberration of the imaging optical system, and it is necessary to correct distortion due to aberration.
- the imaging unit since the imaging unit includes a line sensor, it is not necessary to consider the distortion of the peripheral image that may be caused by the imaging optical system of such an area sensor.
- the imaging unit includes an area sensor.
- At least the colorimetric unit, the moving unit, the transport unit, and the imaging unit are integrally configured as a colorimetric unit, and the colorimetric unit includes the calibration.
- a storage unit is further provided for storing information on the relative positional relationship obtained by the quantity processing unit.
- Measured relative positional information is information unique to the colorimetric unit and the imaging unit.
- the color measurement unit including the color measurement unit and the imaging unit includes the storage unit that stores the information on the relative positional relationship, the color measurement unit and the imaging unit and the measured relative positional relationship of the relative positional relationship are included. Information can be set, and the colorimetric device is less likely to be mistaken for information on the relative positional relationship between other colorimetric units and the imaging unit.
- the color measurement method includes a color measurement unit that measures a color, a moving unit that moves the color measurement unit along a predetermined first direction, and a predetermined paper in the first direction.
- a colorimetric apparatus comprising: a conveyance unit that conveys along a second direction orthogonal to each other; an imaging unit that acquires an image; and a control processing unit that controls the colorimetry unit, the moving unit, the conveyance unit, and the imaging unit.
- a relative position calibration chart image on which a calibration figure having a predetermined calibration feature capable of detecting a position along at least one of the first and second directions is drawn.
- the relative position calibration chart obtained by the imaging unit In the image of the relative position calibration chart obtained by the imaging unit, the relative position calibration chart obtained by the imaging unit and colorimetrically measured by the colorimetric unit.
- Measured relative position school A calibration amount processing step for obtaining information on the relative positional relationship between the colorimetric unit and the imaging unit based on the predetermined calibration feature in the colorimetric result of the chart, and a plurality of patches that are regions of a predetermined color
- each position of the plurality of patches obtained in the position processing step and each position measured by the color measurement unit is corrected, and the color of each of the plurality of patches is changed to the color measurement unit.
- a color measurement processing step for measuring in step (b) is performed.
- a color measuring device and a color measuring method can be provided.
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Abstract
Description
Claims (9)
- 色を測定する測色部と、
前記測色部を所定の第1方向に沿って移動する移動部と、
所定の紙を前記第1方向に直交する第2方向に沿って搬送する搬送部と、
画像を取得する撮像部と、
前記第1および第2方向のうちの少なくとも一方の方向に沿って位置を検知可能な所定の校正用特徴を持つ校正用図形が描かれた相対位置校正用チャートの画像を前記撮像部によって取得するとともに前記相対位置校正用チャートを前記測色部で測色し、前記撮像部によって取得した前記相対位置校正用チャートの画像における前記所定の校正用特徴および前記測色部で測色した前記相対位置校正用チャートの測色結果における前記所定の校正用特徴に基づいて、前記測色部と前記撮像部との相対位置関係の情報を求める校正量処理部と、
所定の色の領域であるパッチを複数備えるカラーチャートの画像を前記撮像部によって取得し、前記取得した前記カラーチャートの画像に基づいて前記複数のパッチの各位置を求める位置処理部と、
前記校正量処理部で求められた前記相対位置関係の情報によって、前記位置処理部で求められた前記複数のパッチの各位置であって前記測色部で測定する前記各位置を修正して、前記複数のパッチそれぞれの色を前記測色部で測定する色測定処理部とを備えること
を特徴とする測色装置。 - 前記相対位置校正用チャートの校正用図形は、一方向に長尺な四角形であること
を特徴とする請求項1に記載の測色装置。 - 前記所定の検出用特徴は、前記校正用図形のエッジであること
を特徴とする請求項1または請求項2に記載の測色装置。 - 前記所定の検出用特徴は、前記校正用図形のエッジの中間点であること
を特徴とする請求項1または請求項2に記載の測色装置。 - 前記カラーチャートは、前記校正用図形を含むこと
を特徴とする請求項1ないし請求項4のいずれか1項に記載の測色装置。 - 前記撮像部は、ラインセンサーを含むこと
を特徴とする請求項1ないし請求項5のいずれか1項に記載の測色装置。 - 前記撮像部は、エリアセンサーを含むこと
を特徴とする請求項1ないし請求項5のいずれか1項に記載の測色装置。 - 少なくとも前記測色部、前記移動部、前記搬送部および前記撮像部は、測色ユニットとして一体で構成され、
前記測色ユニットは、前記校正量処理部で求められた前記相対位置関係の情報を記憶する記憶部をさらに備えること
を特徴とする請求項1ないし請求項7のいずれか1項に記載の測色装置。 - 色を測定する測色部と、前記測色部を所定の第1方向に沿って移動する移動部と、所定の紙を前記第1方向に直交する第2方向に沿って搬送する搬送部と、画像を取得する撮像部と、前記測色部、前記移動部、前記搬送部および前記撮像部を制御する制御処理部とを備える測色装置の測色方法において、
前記第1および第2方向のうちの少なくとも一方の方向に沿って位置を検知可能な所定の校正用特徴を持つ校正用図形が描かれた相対位置校正用チャートの画像を前記撮像部によって取得するとともに前記相対位置校正用チャートを前記測色部で測色し、前記撮像部によって取得した前記相対位置校正用チャートの画像における前記所定の校正用特徴および前記測色部で測色した前記相対位置校正用チャートの測色結果における前記所定の校正用特徴に基づいて、前記測色部と前記撮像部との相対位置関係の情報を求める校正量処理工程と、
所定の色の領域であるパッチを複数備えるカラーチャートの画像を前記撮像部によって取得し、前記取得した前記カラーチャートの画像に基づいて前記複数のパッチの各位置を求める位置処理工程と、
前記校正量処理工程で求められた前記相対位置関係の情報によって、前記位置処理工程で求められた前記複数のパッチの各位置であって前記測色部で測定する前記各位置を修正して、前記複数のパッチそれぞれの色を前記測色部で測定する色測定処理工程とを備えること
を特徴とする測色方法。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10507836A (ja) * | 1994-10-19 | 1998-07-28 | グラフィクス・マイクロシステムズ・インク | 照合による印刷機上のカラー測定方法 |
JP2000122184A (ja) * | 1998-10-21 | 2000-04-28 | Fuji Photo Film Co Ltd | 画像解析測定装置 |
JP2000253262A (ja) * | 1999-02-25 | 2000-09-14 | Sharp Corp | 色情報測定システム |
JP2002131134A (ja) * | 2000-08-11 | 2002-05-09 | Gretag Macbeth Ag | 平面試料の色測定を行うための方法および装置 |
WO2007144284A1 (en) * | 2006-06-16 | 2007-12-21 | Hewlett-Packard Development Company, L.P. | Printing device, carriage and color measurement method |
JP2012081617A (ja) * | 2010-10-08 | 2012-04-26 | Komori Corp | 印刷機の制御装置および制御方法 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2757545B2 (ja) * | 1990-07-27 | 1998-05-25 | 大日本スクリーン製造 株式会社 | 複数の画像読取りシステム相互の位置誤差補償方法 |
JP2002022538A (ja) * | 2000-07-11 | 2002-01-23 | Dainippon Printing Co Ltd | 印刷物測色装置 |
JP2002303549A (ja) * | 2001-04-03 | 2002-10-18 | Nec Soft Ltd | 分光反射率測定用シート及び分光反射率測定方法並びに分光反射率測定制御用プログラム |
US8132887B2 (en) * | 2010-03-02 | 2012-03-13 | Innolutions, Inc. | Universal closed loop color control |
JP2014170196A (ja) * | 2013-03-05 | 2014-09-18 | Canon Inc | 画像形成装置 |
WO2015166797A1 (ja) * | 2014-04-28 | 2015-11-05 | コニカミノルタ株式会社 | 測色装置および測色方法 |
-
2015
- 2015-04-23 US US15/309,105 patent/US9681012B2/en active Active
- 2015-04-23 JP JP2016517867A patent/JP6520931B2/ja active Active
- 2015-04-23 WO PCT/JP2015/062434 patent/WO2015170603A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10507836A (ja) * | 1994-10-19 | 1998-07-28 | グラフィクス・マイクロシステムズ・インク | 照合による印刷機上のカラー測定方法 |
JP2000122184A (ja) * | 1998-10-21 | 2000-04-28 | Fuji Photo Film Co Ltd | 画像解析測定装置 |
JP2000253262A (ja) * | 1999-02-25 | 2000-09-14 | Sharp Corp | 色情報測定システム |
JP2002131134A (ja) * | 2000-08-11 | 2002-05-09 | Gretag Macbeth Ag | 平面試料の色測定を行うための方法および装置 |
WO2007144284A1 (en) * | 2006-06-16 | 2007-12-21 | Hewlett-Packard Development Company, L.P. | Printing device, carriage and color measurement method |
JP2012081617A (ja) * | 2010-10-08 | 2012-04-26 | Komori Corp | 印刷機の制御装置および制御方法 |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2020126015A (ja) * | 2019-02-06 | 2020-08-20 | コニカミノルタ株式会社 | 測定装置、走査方向判定システム及び走査方向判定プログラム |
JP7081520B2 (ja) | 2019-02-06 | 2022-06-07 | コニカミノルタ株式会社 | 測定装置、走査方向判定システム及び走査方向判定プログラム |
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