WO1991008545A1 - Procede et dispositif d'examen d'une surface presentant des symboles imprimes - Google Patents

Procede et dispositif d'examen d'une surface presentant des symboles imprimes Download PDF

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Publication number
WO1991008545A1
WO1991008545A1 PCT/JP1990/001533 JP9001533W WO9108545A1 WO 1991008545 A1 WO1991008545 A1 WO 1991008545A1 JP 9001533 W JP9001533 W JP 9001533W WO 9108545 A1 WO9108545 A1 WO 9108545A1
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WO
WIPO (PCT)
Prior art keywords
dots
symbol
printing surface
printed
predetermined
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP1990/001533
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English (en)
Japanese (ja)
Inventor
Takayoshi Honda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujisawa Pharmaceutical Co Ltd
Original Assignee
Fujisawa Pharmaceutical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fujisawa Pharmaceutical Co Ltd filed Critical Fujisawa Pharmaceutical Co Ltd
Publication of WO1991008545A1 publication Critical patent/WO1991008545A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V10/00—Arrangements for image or video recognition or understanding
    • G06V10/20—Image preprocessing
    • G06V10/24—Aligning, centring, orientation detection or correction of the image

Definitions

  • the present invention relates to a method and an apparatus for inspecting a symbol printing surface, and more particularly, to a method and an apparatus for inspecting a symbol printed on a label attached to, for example, a medicine container.
  • serial number, expiration date, and other information are printed on the label attached to the pharmaceutical container. Printing and attaching such labels are conventionally performed as follows.
  • Unprinted labels are attached at equal intervals to a band-shaped backing paper.
  • This backing is wound in a coil form on an unwinding roll, and the backing roll is wound up on a take-up roll.
  • a label printing machine and a label attaching device are arranged between the take-out roll and the take-up roll. The required information is printed by a printing machine on the label of the mount fed out from the line-out opening, and the printed label is peeled off from the mount by the attaching device and attached to the container. Then, the backing sheet without the label is wound on a winding roll.
  • Label printing machines record printing information such as serial numbers and expiration dates.
  • the marked printing plate has a plate roll fixed to the outer peripheral surface, and the ink attached to the surface of the printing plate of the plate roll is transferred to the surface of the label.
  • the ink adhered to the surface of the printing plate is temporarily transferred to the surface of the transfer roll, and the ink transferred to the surface of the transfer roll is transferred to the surface of the label.
  • the following printing defects may occur. That is, the ink adheres to a portion of the label surface other than the printed portion, and the label is stained.
  • the printing plate has too much ink on it, making the print too dark or clogging between symbols. Ink is not sufficiently adhered to the printing plate, and the printing becomes too light or missing. Printing may be missing due to deterioration of the printing plate.
  • a print portion is imaged by a two-dimensional imaging means such as a television camera, and the total area of the ink portion in the entire print portion is obtained. To check if they are within the allowable range.
  • An object of the present invention is to solve the above-mentioned problems and to provide a method and apparatus capable of accurately inspecting a printed surface on which a plurality of symbols are printed. Disclosure of the invention
  • the method according to the invention comprises:
  • a method for inspecting a printing surface on which a plurality of symbols are printed wherein a predetermined imaging range including the printing surface is imaged by two-dimensional imaging means, and the imaging range is determined by a horizontal scanning line of the video signal and a predetermined clock signal.
  • the number of dots at the midpoint of the width of the bright portion and the number of dots at the midpoint of the width of the dark portion of each symbol are obtained, and these are within a predetermined allowable range. It is characterized by including a mid-point inspection process to check whether or not it is.
  • the method according to the invention also comprises
  • a method for inspecting a printing surface on which a plurality of symbols are printed wherein a predetermined imaging range including the printing surface is imaged by two-dimensional imaging means, and the image signal is scanned by a horizontal scanning line and a predetermined clip signal.
  • the ratio between the reference value of the total number of dots in the dark area of the printed surface and the measured value of the total number of dots is obtained, and this is used as a correction coefficient. It is characterized by including a symbol missing and symbol clogging inspection step of multiplying the measured value by this correction coefficient and checking whether the result is within a predetermined allowable range.
  • the method further includes a printing surface position inspection step of comparing the position of the printing surface obtained from the binary signal with a reference position.
  • the method further includes a symbol width inspection step of determining the width of each symbol in the horizontal scanning direction and the vertical scanning direction from the binary signal and checking whether or not the width is within a predetermined allowable range.
  • the device according to the invention comprises:
  • An apparatus for inspecting a printing surface on which a plurality of symbols are printed two-dimensional imaging means for imaging a predetermined imaging range including the printing surface, a horizontal scanning line of a video signal of the imaging means, and a predetermined click signal.
  • the above-mentioned imaging range is equally divided into a plurality of dots in the horizontal scanning direction and the vertical scanning direction respectively, and each dot is binarized into a bright part and a dark part by a predetermined threshold value.
  • the number of dots at the midpoint of the width of the bright portion and the number of dots at the midpoint of the width of the dark portion of each symbol are obtained, and these are within a predetermined allowable range. It is characterized by being provided with a midpoint inspection means for checking whether or not it is.
  • An apparatus for inspecting a printing surface on which a plurality of symbols are printed comprising: a two-dimensional imaging unit for imaging a predetermined imaging range including the printing surface; The above-mentioned imaging range is equally divided into a plurality of dots in the horizontal scanning direction and the vertical scanning direction, respectively, by a horizontal scanning line of a video signal of the imaging means and a predetermined click signal, and each dot is determined by a predetermined value.
  • Symbol dot number inspection means for checking whether the measured value of the number of dots in the bright portion or the number of dots in the dark portion of each symbol obtained from the above-mentioned binarized signal is within a predetermined allowable range
  • the ratio between the reference value of the total number of dots in the dark area of the printed surface and the measured value of the total number of dots is calculated, and this is used as a correction coefficient to calculate the number of dots in the dark area of each symbol.
  • This is characterized by the provision of means for checking for missing or clogged symbols that multiplies the measured value by this correction coefficient and checks whether the result is within a predetermined allowable range.
  • a printing surface position inspection means for comparing the position of the printing surface obtained from the binarized signal with a reference position.
  • the width of each symbol in the horizontal scanning direction and the vertical scanning direction is obtained from the above-mentioned binary signal, and the symbol width inspection means for checking whether or not these are within a predetermined allowable range is lowered. .
  • the number of dots at the midpoint of the width of the light part and the number of dots at the midpoint of the width of the dark part of each symbol are determined, and by checking whether these are within predetermined tolerances, the fineness of the symbol can be determined. Chips, fine clogs and dirt are accurately detected and the continuity of symbols is detected. Will be examined.
  • the darkness of each symbol is checked by checking whether the measured number of dots in the light or dark portions of each symbol is within a predetermined tolerance.
  • the ratio between the reference value of the total number of dots in the dark area of the printed surface and the measured value of the total number of dots is calculated, and this is used as a correction coefficient. By multiplying the correction factor and checking if the result is within the prescribed tolerances, each symbol is correctly checked for chipping and clogging.
  • the deviation of the printing position is inspected.
  • the size of the symbol is checked by determining the width of each symbol in the horizontal and vertical scanning directions and checking if they are within a predetermined tolerance.
  • FIG. 1 shows a label printing machine and a printing machine showing an embodiment of the invention. It is a schematic side view of a surface inspection apparatus.
  • FIG. 2 is a plan view showing the label before printing.
  • FIG. 3 is a plan view showing the label after printing.
  • FIG. 4 is a plan view showing a printing surface of the label.
  • FIG. 5 is a block diagram showing an electrical configuration of the printing surface inspection apparatus.
  • FIG. 6 is an explanatory diagram showing an imaging range of a television camera.
  • FIG. 7, FIG. 8 and FIG. 9 are explanatory diagrams showing the first window.
  • FIG. 10 is an explanatory diagram showing the midpoint of the width of the dark part.
  • FIG. 11 is an explanatory view showing the midpoint of the width of the bright part.
  • FIG. 12 is a time chart showing the operation of each part of the printing surface inspection apparatus.
  • FIG. 13 is a flowchart showing the operation of the printing surface inspection apparatus.
  • Fig. 1 schematically shows the mechanical configuration of the label printing machine (1) and the printing surface inspection device (2)
  • Fig. 2 shows the label (3) before printing
  • Fig. 3 shows the label (3) after printing.
  • Labels are collectively referred to by reference numeral (3), and when it is necessary to distinguish labels after printing, they are called label No. 1 (3a), label No. 2 (3b), label No. 3 (3c) I will. In addition, these distinctions will be described later.
  • the label (3) is stuck on one side of the band-shaped label mount (4) at equal intervals.
  • the backing sheet (4) is wound in a coil shape on a pay-out roll (5), and the backing sheet (4) fed out is wound around a take-up roll (not shown).
  • a label printing machine (1), an ultraviolet drying device (6), a printing surface inspection device (2), and a label sticking device (not shown) are arranged between the unwinding roll (5) and the winding roll.
  • a plurality of rolls (7), (8), (9) are provided between the feeding roll (5) and the printing press (1) and at appropriate places (not shown) for feeding and guiding the mount (4). .
  • the printing press (1.) is provided with a printing roll (10) that rotates continuously clockwise in FIG.
  • Three printing plates (11) are fixed in a predetermined range on the outer peripheral surface of the printing roll (10). These printing plates are collectively referred to by the reference numeral (11), and if it is necessary to distinguish them, the first printing plate (11a), the second printing plate (lib), and the third printing plate ( 11c). Printing information described later is engraved on the printing plate (11), and ink is attached to the surface of the printing plate (11) from an ink pool (not shown) via an intermediate roll.
  • the label mount (4) intermittently moves three labels (3) to the left in Fig. 1 in synchronization with the rotation of the printing roll (10).
  • the three labels (3) are printed by three printing plates (11).
  • the label printed with the first printing plate (11a) is labeled with the first label (3a)
  • the label printed with the second printing plate (lib) is labeled with the second label (3b) and the third label.
  • the label printed by the printing plate (11c) is called the third label (3c).
  • label 1 (3a), label 2 (3b) and label 3 (3c) are placed on the printed label mount (4) from the front in the moving direction. Will appear repeatedly in this order.
  • the printed surface of the label (3) is printed with the name of the drug (not shown) and the name of the manufacturer (12) (not shown). (13), a part with the serial number printed (Al), a part with the four expiration dates printed (14), and a part with the expiration date printed (A2).
  • the part on which the serial number is printed (A1) is called the first printing surface, and the part (A2) on which the expiration date is printed is called the second printing surface.
  • On the first printing surface (A1) for example, a symbol of up to four digits (for example, Arabic numerals) representing a serial number is printed.
  • the second printing surface (A2) for example, up to 7-digit symbols (up to 6-digit Arabian numerals and 1-digit period) indicating the expiration date are printed, for example. Inspection of the printing surface, which will be described later, is performed only on the first printing surface (A1) and the second printing surface (A2), whereby the quality of the entire printing surface is estimated.
  • the printed surface is dried while the printed label mount (4) passes through the drying unit (6).
  • the label (3) is peeled off from the backing sheet (4) by a sticking device and pasted on a container (not shown), and the backing sheet (4), which has no label, is placed at the winding port. It is wound up.
  • the electrical configuration of the inspection device (2) is shown in Fig. 5.
  • the inspection device (2) consists of a television camera (two-dimensional imaging means) (15), monitor (16), frame memory (17), image processing board (18), micro-camera (19) , A label detector (20) and a synchronization signal generator (21).
  • the television camera (15) is, for example, a shutter camera equipped with a CCD solid-state imaging device, and is arranged on the moving path of the first printing surface (A1) and the second printing surface (A2) of the label (3). ing. Then, a predetermined imaging range (B) (see FIG. 4) including the first printing surface (A1) and the second printing surface (A2) is imaged by the television camera (15). A lighting device (23) is provided below the TV camera (15).
  • the frame memory (17) stores the television image in the imaging range (B) in the vertical scanning direction and the horizontal scanning direction using a horizontal scanning line of a video signal from the television camera (15) and a predetermined reference clock pulse.
  • the video signal corresponding to each dot is binarized into a bright part (bright part) and a dark part (dark part) according to a predetermined threshold, and binarized for each dot.
  • the signal is recorded as image data and output to a computer (19) .
  • the binarized dark areas correspond to areas with ink and print stains, and the bright areas correspond to bright areas.
  • the label without these (3) corresponds to the surface of the label itself, and the frame memory (17) represents the dots within the imaging range (B) using the X coordinate and the Y coordinate as follows.
  • the imaging range (B) of The horizontal scanning line at the upper end is the X axis
  • the vertical line connecting the left end point of the imaging range (B) is ⁇ ⁇
  • the intersection of these is the origin (0).
  • the direction of the horizontal scanning line (horizontal direction) is the X-axis direction
  • the vertical scanning direction (vertical direction) orthogonal thereto is the ⁇ -axis direction.
  • the X coordinate value of each dot within the imaging range ( ⁇ ) is represented by the number of reference clock pulses that equally divide the horizontal scanning line with the origin (0) as 0.
  • the ⁇ coordinate value is the origin. It is represented by the number of horizontal scanning lines, where (0) is 0.
  • An image processing board (18) receives a video signal of a television camera (15) through a frame memory (17). As in the case of the frame memory (17), the image processing board (18) binarizes the television image into bright and dark parts corresponding to a plurality of dots, one for each horizontal scanning line. The number of dots in the dark portion on the horizontal scanning line is stored as line data and output to the computer (19).
  • the image processing board (18) is provided with a display switching switch (22). By switching the switch (22) to a raw image, the video signal from the television camera (15) is sent to the monitor (16), the raw image is displayed, and by switching to the binarized image, The binarized signal is sent to the monitor (16), and the binarized image is displayed.
  • the image processing board (18) is provided with an adjustment dial (24), which can adjust the above-mentioned threshold value for binarization.
  • the label detector (20) is, for example, an incandescent light bulb or LED
  • Light emitting diode Light emitted from a light source such as an optical fiber is coaxially arranged around a light receiving element such as a phototransistor. Is a small, high-sensitivity photoelectric sensor that emits light to the object through the sensor and receives reflected light from the object through the light-receiving element.
  • the front edge (e) of the label (3) in the moving direction Is detected and a trigger signal is output.
  • the synchronization signal generator (21) outputs a rotation synchronization signal once per rotation in synchronization with the rotation of the printing roll (10) of the printing press (1). After the rotation synchronizing signal is output, the printing machine (1) and the inspection device (2>) first output the trigger signal that detects the leading edge (e) of the first label (3a). Has been adjusted.
  • the first label (1a) printed on the first printing plate (11a) is printed first.
  • 3a) is sent below the TV camera (15) of the inspection device (2), and is set at a position where the label detector (20) detects the leading edge (e) of the label (3).
  • the imaging range (B) of the first label (3a) is imaged by the television camera (15), and the image is displayed on the monitor (16). Then, in order to set the reference data for inspection, etc., the first label (3a) is taught in an interactive manner as follows.
  • the symbol string on the first printing surface (A1) is parallel to the X axis, that is, the horizontal scanning line.
  • the first window (W10) is as shown in FIG.
  • the first window (W10) is as shown in FIGS. 8 and 9.
  • the total number of dots in the dark portion in the first window (W10) is obtained and stored as the reference total number of dots.
  • a minimum rectangular frame (symbol window) including one symbol is obtained for each symbol in the first window (W10). Then, in each symbol window, the number of dots in the dark part of each symbol, the width of the symbol in the X-axis direction (X width), and the width of the symbol in the Y ⁇ direction (Y width) are obtained, and these are used as a reference. It is stored as the number of dots, the reference X width, and the reference Y width.
  • the midpoint of the width of the dark part in each symbol window is found, and the number of dots is calculated as the dark part.
  • the midpoint of the width of the light portion in each symbol window is determined, and the number of dots is calculated as the reference midpoint dot. Store as the number of dot dots.
  • a line connecting the midpoints of the widths of the dark portions is indicated by broken lines
  • a line connecting the midpoints of the widths of the light portions is indicated by broken lines.
  • each reference value in the inspection described later Set and memorize allowable values. These values can be modified during operation.
  • the same processing is performed on the second printing surface (A2).
  • the minimum rectangular frame including a symbol of up to 7 digits is used as the reference second window (W20), and the minimum X coordinate value of the window (V20) is Xw20.
  • the maximum X coordinate value is Xw21
  • the minimum Y coordinate value is Yw20
  • the maximum Y coordinate value is Yw21
  • the label detector (20) detects the leading edge (e) of the first label (3a) and triggers.
  • the signal is output (time T2), a short time later (time T3), the shutter of the TV camera (15) is opened for a short time.
  • the imaging range (B) of the first label (3a) has moved below the television camera (15), and this portion is imaged.
  • the inspection of the first label (3a) described later is performed. Odd number of rotation of print roll (i0) , Even if the trigger signal of the second label (3b) is output (time T 4), the inspection of the second label (3b) is not performed.
  • the label detector (20) detects the front (e) of the third label (3c) and outputs a trigger signal (time T5), the same as in the case of the first label (3a)
  • the shutter of the television camera (15) is opened for a short time (time T6)
  • the imaging range (B) of the third label (3c) is imaged, and the inspection of the third label (3c) is performed.
  • the printing roll (10) enters the even-numbered rotation and the rotation synchronization signal is output (time T7), even if the trigger signal of the first label (3a) is output (time T8), the first label is output.
  • the inspection in (3a) is not performed.
  • the label detector (20>) detects the leading edge (e) of the second label (3b) and outputs a trigger signal (time T9), the same as in the case of the first label (3a)
  • the shutter of the television camera (15) is opened for a short time (time T10)
  • the imaging range (B) of the second label (3b) is imaged, and the inspection of the second label (3b) is performed.
  • the trigger signal of the third label (3c) is output (time T11), the inspection of the third label (3c) is not performed.
  • the printed label (3) becomes the first label (3a), the third label (3c), and the second label (3b). Inspection is performed every other sheet in order.
  • the reason for inspecting every other label (3) in this way is that the processing speed for inspection is slower than the moving speed of the label (3). It is also possible to inspect the label (3).
  • the rotation synchronization signal of the odd-numbered rotation of the print roll (10) When the rotation synchronization signal of the odd-numbered rotation of the print roll (10) is output (time T1), it waits for the output of the trigger signal (step 1). As described above, when the trigger signal is output (time T2), the shutter of the TV camera (15) opens (time T3), and the image range (B) of the first label (3a) is opened. ) Is captured and its video signal is sent to the frame memory (17). After waiting for the next vertical synchronization signal (time T12), the binary image data is transferred from the frame memory (17) to the computer (17). 19> (Step 2).
  • Step 3 the settings of the first tracking window (W11) and the second tracking window (W21) (see FIG. 6) are set as follows.
  • Step 3 a second window ( ⁇ 21) is set for the second printing surface (A2), and the coordinate value of the center (P21) is obtained. These are defined as the following second window (W21) and its center (P21).
  • the difference between the center (P21) of the following second window (W21) and the center (P20) of the reference second window (W20) is calculated, and the center of the reference first window (W10) is calculated.
  • P10) is moved by this difference to be the center (P11) of the first tracking window (W11).
  • the subsequent processing is performed on the first following window (W11) and the second following window (21).
  • the first window (W11) following the image processing board (18) is set, and the first window following the image processing board (18) is set.
  • Read the line data of the dough (W11) (Step 4).
  • the vertical synchronizing signal is output (time T15), based on the line data and the image data input from the frame memory (17), the first print surface (A1) is determined as follows. Do (Step 5).
  • the total number of dots in the dark area in the first tracking window (W11) is obtained, and this is used as the total number of dots measured. Then, it is checked whether or not this is within a predetermined allowable range set by teaching, and if not, it is determined that the printing is defective (the entire ink density is poor).
  • the symbol window of each digit is obtained, the number of dots in the dark part of each digit is obtained, and this is used as the number of measured dots. Then, for each digit, it is checked whether or not the number of measured dots is within a predetermined allowable range set by teaching, and if not, a printing failure (ink density failure of each digit) is determined.
  • the ratio between the reference total number of dots during teaching and the above total number of measured dots is determined, and this is used as a gray-scale correction coefficient.
  • the number of measured dots of each digit is multiplied by this correction coefficient, and the result is used as the number of corrected dots of each digit.
  • the total number of measured dots is larger than the reference total number of dots, that is, when the entire printing surface (A1) is dark, the number of measurement dots of each symbol is also larger than the reference number of dots at teaching.
  • the number of measurement dots is not much smaller than the reference number of dots, and this lack may not be distinguished.
  • the number of measured dots The number of correction dots is calculated by multiplying the number of correction dots by the appropriate correction coefficient. In normal cases, the number of correction dots is a value close to the reference number of dots. Therefore, if a symbol is missing, the number of corrected dots is significantly smaller than the number of reference dots, and the missing can be reliably determined. Conversely, if the total number of measured dots is smaller than the reference total number of dots, that is, if the entire printing surface (A1) is thin, the number of measurement dots for each symbol will also be smaller than the reference number of dots at teaching.
  • the number of measured dots does not become much larger than the reference number of dots, and this clogging may not be distinguished.
  • the number of corrected dots is multiplied by the correction coefficient as described above to obtain the number of corrected dots, the number of corrected dots is close to the reference number of dots in a normal case. Therefore, if the symbol is clogged, the number of correction dots becomes considerably larger than the reference number of dots, and the clogging can be reliably determined.
  • the X width and Y width are calculated for each digit symbol, and it is checked whether or not these are within a predetermined allowable range set by teaching. If not, it is determined that the printing is defective (defective symbol size). .
  • the midpoint of the width of the dark part and the number of dots are obtained, and the midpoint of the width of the light part and the number of dots are obtained. These are determined by the predetermined tolerance set by teaching. Check whether it is within the range, and if not, it is judged as poor puncture (bad continuity of symbol). By examining the number of midpoint dots in the width of the dark area, minute defects in the symbol can be accurately detected, and by examining the number of midpoint dots in the light area, minute clogging and contamination of the symbol can be accurately detected.
  • the second follow-up window (W21) is set to the image processing board (18), and the second follow-up window is set from the image processing board (18).
  • the line data of the window (W21) is read (step 6).
  • step 8 when the vertical synchronizing signal is output (time T18), the judgment result is output (step 8). That is, the judgment result is displayed on the monitor (16), and if there is a printing failure, the content is output by voice. In the case of minor printing defects, this is only output by voice, but in the case of serious printing defects, this is output by voice and the machine is stopped.
  • Inspection of label 2 (3b) and label 3 (3c) is the same as for label 1 (3a).
  • the inspection of the first label (3a) the data set by the teaching of the first label (3a), and in the case of the inspection of the second label (3b), the second label (3b)
  • the inspection of data set by the teaching of No. 3 label (3c) setting by teaching of No. 3 label (3c)
  • the used data is used.
  • Performing teaching and inspection for each of the three types of labels (3a), (3b), and (3c) in this manner is based on three types of printing plates (11a) (lib) (11c) for a printing roll (10). Is not constant, and the position and angle of the printing surface ( ⁇ 1) (A2) with respect to the label (3) also vary depending on the type of the label (3a) (3b) (3c).
  • the number of printing plates (11) of the printing roll (10) can be changed as appropriate.
  • the present invention can be applied to a printing surface other than a label, for example, printed on a semiconductor chip / electronic component itself. It can also be used to check for symbols.
  • the method and apparatus for inspecting a symbol printing surface according to the present invention are suitable for being used, for example, for inspecting a symbol printed on a label or the like attached to a medicine container.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Image Processing (AREA)

Abstract

Procédé d'examen d'une surface présentant des symboles imprimés, utilisé pour examiner un symbole imprimé sur une étiquette collée sur un récipient destiné par exemple à contenir un médicament. Ce procédé comprend une étape de saisie d'image consistant à prendre une image d'une plage d'exploration prédéterminée comprenant une surface imprimée, à l'aide d'un capteur bidimensionnel divisant en égale mesure la plage d'exploration en deux composantes horizontale et verticale de balayage comportant chacune un ensemble de points à l'aide des lignes de balayage horizontal d'un signal d'image et de signaux d'horloge prédéterminés, et à rendre ces points binaires de manière à représenter des parties claires et foncées en fonction d'une valeur seuil prédéterminée. Le procédé comprend également une étape d'examen du point médian, consistant à déterminer le nombre de points au niveau du point médian de largeur d'une partie claire d'un symbole et le nombre de points au niveau du point médian de largeur d'une partie foncée de ce même symbole, et à déterminer si ces valeurs se trouvent dans une plage admissible prédéterminée.
PCT/JP1990/001533 1989-12-01 1990-11-26 Procede et dispositif d'examen d'une surface presentant des symboles imprimes Ceased WO1991008545A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP31394789 1989-12-01
JP1/313947 1989-12-01

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WO1991008545A1 true WO1991008545A1 (fr) 1991-06-13

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55117944A (en) * 1979-03-05 1980-09-10 Daihen Corp Pattern automatic check method
JPS627493B2 (fr) * 1976-12-29 1987-02-17 Toppan Printing Co Ltd
JPS63259784A (ja) * 1987-04-17 1988-10-26 Ricoh Co Ltd 文字認識装置
JPH01152586A (ja) * 1987-12-10 1989-06-15 Oki Electric Ind Co Ltd 文字図形認識方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS627493B2 (fr) * 1976-12-29 1987-02-17 Toppan Printing Co Ltd
JPS55117944A (en) * 1979-03-05 1980-09-10 Daihen Corp Pattern automatic check method
JPS63259784A (ja) * 1987-04-17 1988-10-26 Ricoh Co Ltd 文字認識装置
JPH01152586A (ja) * 1987-12-10 1989-06-15 Oki Electric Ind Co Ltd 文字図形認識方法

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