JP5953577B2 - High-precision counting method for folded paper - Google Patents

Description

  The present invention relates to a counting method for the number of folded sheets, and more particularly to a high-precision counting method for the number of folded sheets of printed matter such as catalogs, pamphlets, and instructions.

  A large number of printed materials of the same type, such as catalogs, pamphlets, and manuals, are folded by a folding machine in order to arrange them into a predetermined size, and in that state, arrange them into a predetermined number of sheets. Therefore, it is necessary to count. As a method of counting such folded paper, as described in Patent Documents 1 and 2, the back of the paper is captured with a color TV camera or a monochrome TV camera to obtain video information, or brightness. A method has been proposed in which luminance information is obtained using a meter or the like, and then the obtained video information and luminance information are binarized or binarized and counted.

  However, when the identity of a plurality of folded sheets is high, the color intensity and brightness tend to be almost the same for each sheet, so when binarizing or binarizing, The standard value of the paper can be set easily, but in reality, there are subtle changes in the state in which the paper is aligned and there are not many subtle differences in the crease shape. In many cases, subtle noise is generated in the sheath and brightness information, resulting in erroneous counting. When accurate counting is required, noise may occur in the obtained video information and luminance information due to subtle fluctuations in the state in which the papers that are inevitably arranged in this way are arranged. It is a problem.

  In addition, when imaging multiple folded sheets, the light from the lighting device is not evenly irradiated due to the irradiation condition of the light and the distance from the light source, and the video information to be counted is not uniform. Nevertheless, since the reference value to be compared is a constant value, errors often occur. In particular, recently, it has become necessary to count a large number of sheets by increasing the distance from the light source. In this case, it is necessary to provide a sheet counting method with more accurate counting conditions. This is insufficient even by Patent Document 3 and Patent Document 4, which are the inventors' inventions.

  Japanese Patent Laid-Open No. 61-272892   JP-A-3-238579   Japanese Patent No. 3765112   JP 2007-22052 A

The present invention performs accurate and stable high-precision counting when there is a subtle change in the state in which the sheets are aligned in a plurality of folded sheets, or when counting a large number of sheets with different crease shapes. An object of the present invention is to provide a counting method for the number of sheets that enables accurate and stable high-precision counting with the addition of the counting status.

  The present invention achieves the above-described object, and aligns a plurality of folded sheets so that the back portion is aligned in the same plane, and presses the aligned plurality of sheets with a pressing plate from both sides, obliquely in front of the back portion. Irradiate light to create shadows in the recesses between the backs and non-shadows in the backs, and press the plate on both sides and the backs of the aligned sheets with a color TV camera from the front, the recesses The shadow portion of the image is taken so as to be perpendicular to the horizontal scanning line of the color image signal obtained from the color television camera, and the red / red of the signal for one horizontal scanning line of the back imaging portion of the obtained image signal is captured. The intensity of the green / blue color is made to correspond to each constituent point of the digital signal composed of the number of resolutions of the color TV camera for each minimum resolution unit of the color TV camera from one end to the other end. Are stored in order, and the stored red, green, and blue Divide the constituent points for one horizontal scanning line of 3 colors uniformly into 4 or more, and set the upper reference value of the range divided for each of red, green and blue, or set the value of the preset lower limit line to the lower limit value Adopted as the average value to the value obtained by subtracting the average value from the maximum value of the color strength of the component points in the range divided by 2 in each divided range for each of red, green and blue The upper reference value is obtained by addition, and the lower reference value of the range divided for each of red, green, and blue is set or the value obtained by subtracting the minimum value from the average value is divided by 2 to subtract the value from the average value. Obtain the lower reference value, use the upper reference value as the value of the upper component point position in the center of the division range, and set the values at both ends as the upper end reference value set in advance, and the upper structure at the center of the division range in order from one end Connect the point position values one after the other and connect to the other end to form the upper reference bend line. In addition, the lower reference value is set as the value of the lower component point position at the center of the division range, and the values at both ends are set as the lower end reference values set in advance, and the lower component point position at the center of the division range is sequentially set from one end. Connect values one after the other and connect to the other end to form the lower reference bend line, adopt the value on the upper reference bend line as the upper reference value corresponding to the component point, and correspond the value on the lower reference bend line to the component point The lower reference value is adopted as the lower reference value, and the measurement signal of the color intensity of the constituent point of one horizontal scanning line from one end to the other end is sequentially assigned to the lower reference corresponding to the constituent point value for each constituent point. Compared to the value, the first time the color becomes stronger than the lower reference value for the first time, the color becomes stronger than the upper reference value without becoming weaker than the lower reference value, and then the color becomes weaker than the lower reference value Judge as non-shadow part After the color became weaker than the reference value, the color became stronger than the lower reference value, and after the color became stronger than the upper reference value without being weaker than the lower reference value, the color became weaker than the lower reference value. In the case of a high precision counting method of folded paper, the non-shadow part is determined as a case, the determined non-shadow part is used as a paper back part, and the number of papers is counted by adding the number of back parts. Yes, align multiple folded sheets so that the back is aligned in the same plane, press the aligned multiple sheets with pressing plates from both sides, and irradiate light from diagonally forward of the back to shade the recess between the backs A non-shadow portion is formed on the back portion, and the pressing plates on both sides and the back portions of the plurality of aligned sheets are obtained from the front with a monochrome TV camera, and the shadow portion of the recess is obtained from the monochrome TV camera. Perpendicular to the horizontal scanning line of the monochrome image signal The luminance intensity of the signal of one horizontal scanning line of the back imaging unit of the back image pickup unit of the obtained image signal is measured for each minimum resolution unit of the monochrome TV camera from one end to the other end. The number of components of the digital signal composed of the number of resolutions of the TV camera is stored in order, and the component points for one horizontal scanning line of the stored luminance are uniformly divided into four or more. The value obtained by subtracting the value obtained by subtracting the average value from the maximum value of the luminance intensity of the component points in the range by setting the upper reference value of the range or adopting the preset lower limit line value as the lower limit value The average value is calculated by adding the average value to the upper reference value and setting the lower reference value in the range divided into red, green, and blue, or by subtracting the minimum value from the average value and dividing by two. Subtract from the lower reference value to obtain the upper reference The value of the upper component point position at the center of the divided range is set as the value, and the values of both ends are set as the upper end reference values set in advance. The upper reference bend line is formed by connecting to the other end, the lower reference value is set as the value of the lower component point position at the center of the divided range, and both end values are set as the lower end reference values set in advance at one end. In turn, the values of the lower constituent point positions in the center of the division range are connected one after another, connected to the other end to form the lower reference bending line, and the value on the upper reference bending line is adopted as the upper reference value corresponding to the constituent point The value on the lower reference bending line is adopted as the lower reference value corresponding to the component point, and the measurement signal of the intensity of the luminance of the component point for one horizontal running line from one end to the other end is sequentially configured for each component. For each point, pair with the value of the constituent point. Compared with the corresponding lower reference value, the brightness becomes stronger than the lower reference value for the first time, and after the luminance becomes stronger than the upper reference value without being weaker than the lower reference value, the luminance becomes weaker than the lower reference value. If the brightness becomes lower than the lower reference value, the brightness will be stronger than the lower reference value and will be lower than the lower reference value. When the brightness becomes lower than the lower reference value after the image becomes stronger, it is determined as a non-shadow part, and the determined non-shadow part is set as the back part of the paper, and the number of papers is counted by adding the number of back parts. This is a high-precision counting method for folded paper, characterized by the following: aligning the folded paper so that the back is aligned on the same plane, pressing the aligned paper from both sides with the holding plate, Irradiate light from diagonally forward, recessed between back A shadow portion and a non-shadow portion are formed on the back portion, and the pressing plates on both sides and the back portions of the plurality of aligned sheets are a color TV camera from the front, and the shadow portion of the recess is the color TV camera. The color image signal obtained from the image is taken at right angles to the horizontal scanning line, and the intensity of the red, green, and blue color of the analog signal for one horizontal scanning line of the back imaging unit of the obtained image signal is determined. From one end to the other end, the color analog-to-digital conversion circuit converts it into a multivalued value for each minimum resolution unit of the color TV camera, and converts the intensity of the converted red, green, and blue colors. Values are stored sequentially from one end to the other end corresponding to each constituent point of the digital signal composed of the number of resolutions of the color TV camera, and the stored horizontal colors of red, green and blue Divide the configuration points for one scanning line uniformly into 4 or more Set the upper reference value of the range divided for each of red, green and blue, or adopt the preset lower limit value as the lower limit value, and for each divided range for red, green and blue, Range obtained by subtracting the average value from the value obtained by subtracting the average value from the maximum value of the color intensity of the component points in the range and adding the average value to obtain the upper reference value, and the range divided for each of red, green, and blue The lower reference value is set or the value obtained by subtracting the minimum value from the average value divided by 2 is subtracted from the average value to obtain the lower reference value, and the upper reference value is set as the value of the upper component point at the center of the division range. In addition, the values of both ends are set as the upper end reference value in advance, and the values of the upper constituent point positions in the center of the divided range are sequentially connected from one end to the other end to form the upper reference bending line. Set the lower reference value of the divided range or The value of the lower component point at the center of the divided range is set as the value of the lower component point at the center of the divided range, and the value of both ends is set as the value of the lower reference point of the end. To the other end to form a lower reference bend line, adopt the value on the upper reference bend line as the upper reference value corresponding to the component point, and the value on the lower reference bend line to the lower reference corresponding to the component point As a value, the color intensity measurement signal for one horizontal scanning line from one end to the other end is sequentially compared with the corresponding lower reference value for each constituent point for each constituent point. For the first time, when the color becomes stronger than the lower reference value for the first time, the color becomes stronger than the upper reference value without becoming weaker than the lower reference value, and then the non-shadowed part when the color becomes weaker than the lower reference value. The color is weaker than the lower reference value after the next time When the color becomes stronger than the lower reference value and becomes stronger than the upper reference value without becoming weaker than the lower reference value, the non-shadow part is This is a high-precision counting method for folded paper, characterized in that the determined non-shadow portion is the back of the paper, and the number of paper is counted by accumulating the number of back portions.

  According to the method for counting the number of folded sheets of the present invention, the influence of noise generated when there is a change such as a subtle disturbance in the state of arranging the sheets, or when there is a subtle difference in the crease shape. Therefore, it is possible to prevent erroneous counting and perform stable and highly accurate counting.

  It is a top view which shows an example of the folded paper.   It is explanatory drawing which shows the means to count the number of sheets of the several folded paper 1. FIG.   It is the graph which took the horizontal scanning line composition point on the X-axis, and took the strength of the signal on the Y-axis.   It is a graph when the irradiation distance becomes long and the intensity of the signal decreases from the center toward both ends.   The average value of each of the four divided parts is indicated by ○, the upper reference value is indicated by △, the lower reference value is indicated by ▽, the upper end reference value is indicated by ▲, and the lower end reference value is indicated by ▼. It is the graph which showed the bending line and the lower reference bending line.   The average value of each part divided into 8 is indicated by ○, the upper reference value is indicated by △, the lower reference value is indicated by ▽, the upper end reference value is indicated by ▲, and the lower end reference value is indicated by ▼. It is the graph which showed the bending line and the lower reference bending line.   It is the graph which showed the intersection of the line segment which connected between component points, and the upper and lower reference | standard bending line.   It is the graph which showed the example which the noise produced in the line segment which connected between structural points.   It is the graph which showed the example which the noise produced in the line segment which connected between structural points, and is a graph of the example which cannot remove the influence of noise in the bending line CC of the conventional method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows an example of a sheet folded into a desired size. 1 is a folded sheet, 2 is a back part of the folded sheet 1, and the back part 2 is semicircular as shown in the figure. become.

  FIG. 2 shows a means for counting the number of folded sheets 1. The folded sheets 1 are aligned so that the back portions 2 are aligned on the same plane, and the pressing plates 3 are arranged from both sides. Then, the illumination device 4 irradiates light from an oblique direction in front of the back part 2 to generate a non-shadow part (bright part) 5 on the convex part of the back part and a shadow part 6 in the concave part between the back parts. The illuminating device 4 may be arranged on either the right side or the left side, but if it is arranged in both the right and left diagonal directions and irradiated from both diagonal directions, uniform illumination is possible. is there. Horizontal scanning of the shadow portion 6 and the TV camera signal is performed so that all the shadow portions 6 are imaged by the television camera 7 in which the back portion 2 and the holding plates 3 on both sides of the aligned sheets 1 are fixedly arranged in front of the same. Take an image so that it is perpendicular to the line. The position of the television camera 7 is preferably at the center of the plurality of sheets 1 so that left and right can be imaged uniformly. The obtained image is checked on the image monitor 8 to obtain a good image.

  Next, when the TV camera 7 is an analog color TV camera, an analog color image signal obtained from the color TV camera is converted by the color analog-to-digital conversion circuit 9 to the intensity of red, green, and blue colors. Converted into a multi-valued digital signal, sent to the computer 10, and the intensity of each color of the multi-valued digitized signal is converted into a multi-valued color signal corresponding to each constituent point constituting the horizontal scanning line. Convert. When the camera is a digital system, a digital signal may be sent directly to the computer 10 and used for calculation. In addition, all three colors of the obtained digital signal can be used for counting, or an optimum color signal that appears most strongly according to the color of the paper can be selected and used as a representative signal. In particular, when the paper color is amber / blue, only the blue signal appears clearly, and the intensity of the red / green color becomes unclear, so it is better not to use it for counting to prevent erroneous counting. Often good. In the case of dark blue / blue paper colors, it is difficult to count using a monochrome camera. Therefore, it is desirable to use a color television camera for counting papers of these colors.

  When the TV camera 7 is a monochrome TV camera, the obtained image signal is changed from the color analog-digital conversion circuit 9 to a monochrome analog-digital circuit and sent to the monochrome analog-digital circuit, and the analog luminance signal is multi-valued. 2 is sent to the computer 10 in FIG. 2, and the brightness of the image signal is converted into a multi-valued signal for each constituent point constituting the horizontal scanning line. In this case, a digital monochrome television camera can also be used. In the following description, a color television camera will be described, but a monochrome television camera can be similarly applied.

  The converted red, green, and blue color intensity values are sequentially stored from one end to the other end in correspondence with each constituent point of the digital signal that is composed of the number of resolutions of the analog color TV camera. In addition, when counting the plurality of aligned sheets 1, the signal strength of each constituent point constituting the horizontal scanning line from one pressing plate 3 to the other pressing plate 3 through the plurality of sheets 1 is determined. Is detected for one horizontal scanning line in the direction orthogonal to the shadow portion 6, and the computer monitor 11 takes the horizontal scanning line composing point on the X axis and the signal strength on the Y axis as shown in FIG. And a graph connecting the points indicating the signal strength for each of the horizontal scanning line constituent points with a straight line. In this graph, the non-shadow part (bright part) 5 and the shadow part 6 appear to form a peak and a valley, and appear to swing, and the non-shadow part (bright part) 5 and the shadow part 6 are shown as signal strength. You can know as the difference.

  FIG. 4 is a graph showing details of connecting the color intensity of each component point of the digital signal with a straight line. Since the counting object is wide, the way of lighting differs between the central part and the end part. It is a graph when the center part of becomes high and becomes low at both ends.

  FIG. 5 shows an example of four divisions when the horizontal scanning line is divided into four or more. The lower limit line value set in advance is adopted as the lower limit value, and each of red, green, and blue is divided. The average value, maximum value, and minimum value of the color strength of the component points in the range are calculated, and the average value is added to the value obtained by dividing the maximum value by subtracting the average value by 2. Then, the upper reference value is determined as the value of the upper constituent point position at the center of the divided range, and the values at both ends are set as the upper end reference values at the ends indicated by ▲ in order from one end. Connect the values of the component points at the center of the division range one after the other and connect to the other end to form the upper reference bend line, and add the average value to the value obtained by subtracting the minimum value from the average value divided by 2 The lower reference value indicated by ▽ is obtained, and then the lower reference value is calculated at the center of the divided range. The value of the component point position and the value of both ends are set in advance as the lower end reference value indicated by ▼, and the value of the component point position in the center of the divided range is sequentially connected from one end to the other end. A lower reference bending line is formed, and values on the respective lines are adopted as reference values corresponding to the respective constituent points. The bending line may be a curved line or a straight line depending on conditions. The upper reference value and the lower reference value may be corrected and set according to the graph shape.

  FIG. 6 shows an example in which the horizontal scanning line is divided into eight. The value of the preset lower limit line is adopted as the lower limit value, and the ranges are divided into red, green, and blue, respectively. Calculate the average value, maximum value, and minimum value of the color strength of the component points in the upper reference value indicated by △ by adding the average value to the value obtained by subtracting the average value from the maximum value and dividing by 2 Then, the upper reference value is set as the value of the upper constituent point position at the center of the divided range, and the values at both ends are set as the upper end reference values indicated by ▲ in the order of the center of the divided range in order from one end. Consecutive point position values are connected one after the other and connected to the other end to form the upper reference bending line, and the average value is added to the value obtained by subtracting the minimum value from the average value by 2, and the lower part indicated by ▽ A reference value is obtained, and then the lower reference value is set to the lower component point position in the center of the division range As the lower end reference value indicated by ▼, the values at both ends are set in advance, and the value of the central component point position of the divided range is sequentially connected from one end to the other end, and the lower reference bend line is connected to the other end. Then, the values on the respective lines are adopted as reference values corresponding to the respective constituent points. The bending line may be a curved line or a straight line depending on conditions. The upper reference value and the lower reference value may be corrected and set according to the graph shape. Compared with the 4-division bend line in FIG. 5, the 8-division bend line in FIG. 6 has a larger number of divisions in this example, and it can be seen that a more appropriate bend line has been calculated.

FIG. 7 is a diagram showing the constituent points for one horizontal scanning line from p1 to p34, connecting the constituent points with straight lines, and representing the upper reference bending line AA and the lower reference bending line BB. A method for determining the part will be described.
In this method, from one end to the other end, the color intensity measurement signal for one horizontal scanning line is sequentially compared for each constituent point with the corresponding lower reference value for each constituent point. For the first time, when the color becomes stronger than the lower reference value for the first time, the color becomes stronger than the upper reference value without becoming weaker than the lower reference value, and the color becomes weaker than the lower reference value. After the next time, the color becomes weaker than the lower reference value from the state where the color is weaker than the lower reference value. After the color becomes stronger than the upper reference value without being weaker than the lower reference value, the lower reference When the color becomes weaker than the value, it is determined as a non-shadow part, which will be described in more detail in FIG.

  That is, for the first time between the constituent points p3 and p4, the lower reference bending line BB is exceeded upward, and the upper reference bending line between the constituent points p5 and p6 without crossing the lower reference bending line BB downward. It is determined as a non-shadow part by crossing A-A upward and crossing the lower reference bend line BB downward between the constituent points p11 and p12, and thereafter, from the lower reference bend line B as p12 From the state where the composing point is low, the lower reference bending line BB is moved upward as between the composing points p12 and p13, and the lower reference bending line BB is not moved downward and between the composing points p14 and p15. Thus, a new non-shadow part is detected by crossing the upper reference bending line AA upward and crossing the lower reference bending line B-B downward between the constituent points p20 and p21. Continue to detect non-shadows in the same way until the last point, and multiply the number of detected non-shadows And, the non-shadow portion as the back portion of the sheet, the number of integration has been back portion and the number of sheets.

  FIG. 8 shows an example in which noise is generated. The configuration points for one horizontal scanning line are represented from p1 to p34, and each configuration point is connected by a straight line to connect the upper reference bending line AA and the lower reference bending line BB. In the figure shown, noise is generated at the constituent points p9, p10, p11 and p12, p13, p14. The upper reference bending line AA is passed between the constituent points p5 and p6 without crossing the lower reference bending line BB upward between the constituent points p3 and p4 and without going down the lower reference bending line BB downward. , Upward after p7, then downward, then upward at p10, and below the lower reference bending line B-B between the constituent points p11 and p12, one non-shadow part Is determined.

  In the determination of the back portion in the binarization method with the bent line CC of the conventional method shown in FIG. 9, it is determined that there are two non-shadow portions, and erroneous counting occurs. Further, the noise at the component points p12, p13 and p14 is such that p12 is below the lower reference line BB and exceeds the lower reference bend line BB between p12 and p13, but the upper reference bend. Since the lower reference bending line BB is crossed downward between p13 and p14 without crossing the line AA upward, it is not determined as a non-shadow part, and is determined as a non-shadow part from p14 to p21. Counting without erroneous counting can be performed. In the bending line CC of the conventional method, the determination method by binarization determines that this noise portion is one non-shadow portion, so that an erroneous count occurs. In the example in which noise is generated in FIG. 9, the bent line that can be set by the conventional method is affected by noise in almost all cases and causes an error. This method can prevent such erroneous counting.

  As described above, by using the two reference bend lines, the upper reference bend line AA and the lower reference bend line BB, in which the reference used for counting is matched to the shape of the scanning line, the unevenness and folding of the sheet can be prevented. Stable and accurate counting that is less affected by noise due to the difference is possible.

DESCRIPTION OF SYMBOLS 1 Folded paper 2 Back part 3 Holding plate 4 Illumination device 5 Non-shadow part 6 Shadow part 7 Television camera 8 Image monitor 9 Color analog-digital conversion circuit 10 Computer 11 Computer monitor

Claims (3)

  Arrange the folded sheets so that the back is aligned on the same plane, press the aligned sheets from both sides with pressing plates, and irradiate light from the front of the back diagonally to the recess between the back and shadow. A non-shadow portion is generated in the color TV camera from the front with the pressing plates on both sides and the back portions of the aligned plural sheets, and the shadow portion of the recess is obtained from the color TV camera. The image signal is imaged so as to be perpendicular to the horizontal scanning line of the image signal, and the intensity of the red, green, and blue colors of the signal for one horizontal scanning line of the back imaging unit of the obtained image signal is measured from one end to the other. Each of the minimum resolution units of the color TV camera to the end is sequentially stored in correspondence with each constituent point of the digital signal that is composed of the number of resolutions of the color TV camera, and the stored red, green, and blue Uniformly make up the component points of one horizontal scanning line of 3 colors The upper reference value of the range divided for each of red, green, and blue is set, or the value of the lower limit line set in advance is adopted as the lower limit value, and each of red, green, and blue is divided. The upper reference value is obtained by adding the average value to the value obtained by subtracting the average value from the maximum value of the color intensity of the component points in the range and dividing by 2, and for each of red, green and blue Set the lower reference value of the range divided into two or subtract the value obtained by subtracting the minimum value from the average value by 2 and subtract the value from the average value to obtain the lower reference value. The value of the component point position is set, and the values of both ends are set as the upper end reference values in advance. Form a bend line and set the lower reference value to the center of the division range The value of the lower component point position is set, and the values of both ends are set as the lower end reference values in advance, and the values of the lower component point positions at the center of the division range are connected in order from one end to the other end and connected to the lower end. A reference bend line is formed, the value on the upper reference bend line is adopted as the upper reference value corresponding to the constituent point, and the value on the lower reference bend line is adopted as the lower reference value corresponding to the constituent point, from one end to the other Comparing the color intensity measurement signal of one horizontal scanning line to the end with the lower reference value corresponding to the constituent point value for each constituent point sequentially, the first time the lower reference value If the color becomes stronger and the color becomes stronger than the upper reference value without becoming weaker than the lower reference value, then the color becomes weaker than the lower reference value. From the state where the color is weaker than the value, the bottom reference If the color becomes stronger than the lower reference value without becoming weaker than the lower reference value, then the color becomes weaker than the lower reference value. A high-precision counting method for folded paper, wherein the shadow portion is the back portion of the paper, and the number of paper is counted by accumulating the number of back portions.   Arrange the folded sheets so that the back is aligned on the same plane, press the aligned sheets from both sides with pressing plates, and irradiate light from the front of the back diagonally to the recess between the back and shadow. A non-shadow portion is formed on the monochrome television camera from which the pressing plates on both sides and the backs of the aligned plurality of sheets are front-facing with a monochrome television camera, and the shadow portion of the recess is obtained from the monochrome television camera. The monochrome television image is picked up at a right angle to the horizontal scanning line of the image signal, and the intensity of the luminance of the signal of one horizontal scanning line of the back image pickup unit of the obtained image signal is measured from one end to the other end. Each of the minimum resolution units of the camera is sequentially stored in correspondence with each of the constituent points of the digital signal having the number of resolutions of the monochrome television camera, and the constituent points for one horizontal scanning line of the stored luminance are obtained. Divide evenly into 4 or more Set the upper reference value of the divided range or adopt the preset lower limit line value as the lower limit value and subtract the average value from the maximum value of the intensity of the luminance of the component points in the range by 2. The average value is added to the divided value to obtain the upper reference value, and the lower reference value in the range divided by red, green, and blue is set, or the value obtained by subtracting the minimum value from the average value is divided by 2. Is subtracted from the average value to obtain the lower reference value, the upper reference value is the value of the upper constituent point position in the center of the divided range, and both end values are the upper end reference values set in advance, in order from one end The upper constituent point position values at the center of the divided range are connected one after another, and connected to the other end to form an upper reference bending line, the lower reference value is set as the lower constituent point position value at the center of the divided range, and The lower end base with the preset value The value of the lower component point in the center of the divided range is connected in order from one end to the other, and the lower reference bend line is formed by connecting to the other end, and the value on the upper reference bend line is the upper reference corresponding to the component point. As a value, a value on the lower reference bending line is used as a lower reference value corresponding to the constituent point, and a measurement signal of the intensity of the luminance of the constituent point for one horizontal scanning line from one end to the other end is obtained. For each constituent point sequentially, compared to the constituent point value and the corresponding lower reference value, the brightness is stronger for the first time than the lower reference value for the first time. When the brightness becomes weaker than the lower reference value after the value becomes stronger, it is determined as a non-shadow part.From the next time the brightness becomes weaker than the lower reference value, the brightness becomes stronger than the lower reference value and the lower reference value. Without the brightness becoming weaker than the value When the brightness becomes stronger than the upper reference value and then becomes lower than the lower reference value, it is determined as a non-shadow part.The determined non-shadow part is regarded as the back of the paper, and the number of back parts is added up. A high-precision counting method for folded paper, wherein the number of sheets is counted.   Arrange the folded sheets so that the back is aligned on the same plane, press the aligned sheets from both sides with pressing plates, and irradiate light from the front of the back diagonally to the recess between the back and shadow. A non-shadow portion is generated in the color TV camera from the front with the pressing plates on both sides and the back portions of the aligned plural sheets, and the shadow portion of the recess is obtained from the color TV camera. The image signal is imaged so as to be perpendicular to the horizontal scanning line of the image signal, and the intensity of the red, green, and blue colors of the analog signal for one horizontal scanning line of the back imaging unit of the obtained image signal is determined from one end. The color analog-to-digital conversion circuit converts it to a multivalued value for each minimum resolution unit of the color TV camera up to the other end, and converts the converted red, green, and blue color intensity values to one From one end to the other end of the color TV camera It stores sequentially corresponding to each constituent point of the digital signal composed of the number of image degrees, and the stored constituent points for one horizontal scanning line of three colors of red, green and blue are uniformly divided into four or more Set the upper reference value of the range divided for each of red, green, and blue, or adopt the preset lower limit value as the lower limit value, and set each divided range for each of red, green, and blue. The upper reference value is obtained by adding the average value to the value obtained by subtracting the average value from the maximum value of the color intensity of the constituent points in the range and dividing the value by 2, and divided into red, green, and blue. Set the lower reference value of the range, or subtract the value obtained by subtracting the minimum value from the average value by 2, and subtract the value from the average value to obtain the lower reference value. The upper reference value is the value of the upper component point at the center of the division range And the values at both ends are set as one of the end upper reference values. Connect the values of the upper component points in the center of the divided range one after another and connect to the other end to form the upper reference bending line, and set the lower reference value of the divided range or set the lower reference value to the center of the divided range The value of the lower component point position of each of the two, and the value of both ends as the reference value of the lower end of the preset end, the values of the lower component point position in the center of the divided range are connected in order from one end, and then connected to the other end The lower reference bend line is formed, the value on the upper reference bend line is adopted as the upper reference value corresponding to the constituent point, the value on the lower reference bend line is adopted as the lower reference value corresponding to the constituent point, and from one end By comparing the color intensity measurement signal of one horizontal scanning line up to the other end with the lower reference value corresponding to the component point value for each constituent point in turn, the first time the lower reference Color is stronger than value, bottom After the color became stronger than the upper reference value without becoming weaker than the reference value, it was judged as a non-shadow part when the color became weaker than the lower reference value, and the color became weaker than the lower reference value after the next time. From the state, after the color becomes stronger than the lower reference value, the color becomes stronger than the upper reference value without becoming weaker than the lower reference value, and then the color becomes weaker than the lower reference value, it is determined as a non-shadow part. A highly accurate counting method for folded paper, wherein the determined non-shadow portion is the back of the paper, and the number of paper is counted by integrating the number of backs.

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