JPH06290260A - Mat input device - Google Patents

Abstract

PURPOSE:To provide the device which automatically corrects the inclination of a layout sheet to a reference axis on the basis of position information on the reference line on the map only by inputting the layout sheet where a plate making frame, etc., are drawn from an image input means. CONSTITUTION:On the basis of plural pieces of position information that a position information extracting means 12 finds as to information regarding the reference information in a layout sheet image inputted from the image input means 11, a frequency distribution arithmetic means 14 finds inclination data on the reference line and also calculates the frequency distribution of the inclination data. Then a frequency distribution correcting means 15 deletes unnecessary inclination data from the frequency distribution and an image rotating means 17 rotates image information on the layout sheet according to the inclination of the reference lie found on the basis of the remaining frequency distribution.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount input device used in, for example, a plate making process, more specifically, a mount on which printed figures such as magazines, posters and the like, such as a photograph position, a character position and a graphic indicating a graphic position are read. Regarding a mount input device.

[0002]

2. Description of the Related Art A conventional mount input device is a flat bed type image scanner for reading line drawings such as a plate making frame 31 and a layout frame 35 drawn on a mount 30 of FIG. It is composed of a computer main body that performs processing such as binarization and the like, a display that displays the read line drawing, and the like. Then, the operator of the scanner calls the image data such as a photograph read separately from the read line drawing on the display, and trims the layout frame (trimming frame) 35.

In such a conventional mount input device,
When the scanner operator reads the line drawing drawn on the mount into the image scanner, the mount is placed with the mount tilted with respect to the reference axis, that is, with respect to the reading scanning direction of the image scanner. It may end up. If other image data such as a photograph is positioned with respect to the layout frame on the mount image that is read in the tilted state, there is a problem that the image data is allocated in the tilted state. .

Conventionally, the inclination of the mount image of this type is corrected by displaying the read line image on the display and giving a rotation instruction to the line image while the scanner operator visually checks the display. Was there.

On the other hand, with respect to the inclination of the mount image, Japanese Patent Laid-Open No.
It was also possible to calculate and correct the tilt angle by detecting the contour 36 of the mount 30 or the plate making frame 31 read by the image inputting means by applying the publication No. 105691.

[0006]

However, with the former method, it is difficult to detect the tilt angle at once by visual observation, and several rotation instructions are required to make corrections. Since this correction is performed by a human sense, the inclination angle is not always corrected accurately, and there is a drawback that it takes time and labor.

In the latter technique, when the image input means detects the inclination angle of the contour 36 and corrects it, it is possible to correct the inclination angle of the contour 36 accurately.
The standard for positioning the image data is the plate making frame, and the contour 3
When the inclination angles of 6 and the plate making frame 31 do not match, the inclination of the plate making frame 31 is not corrected, and there is a case where the plate making frame 31 remains tilted with respect to the reference axis 34. On the other hand, with the latter technology,
It is conceivable to detect the plate making frame 31 instead of the contour 36, but it is used to align the figure drawn on the outside of the plate making frame 31 (for example, the positions of the plates separated into four colors of yellow, red, indigo, and black). There is a possibility that the scanner may read a cross-shaped reference figure 32 called a register mark or a register mark, and a colored ball 33 for indicating what color each of the four color-separated plates are. . If the scanner reads these figures as the information of the plate making frame 31, it will detect an incorrect tilt angle.

[0008]

In order to solve the above problems, in the mount input device according to the present invention,
An image input unit 11 that captures an image drawn on a mount, and a position for which a plurality of position information is obtained with respect to a reference line (for example, each side that constitutes the plate making frame 31) drawn on the mount from the image information of the imported mount The information extracting means 12, the position difference calculating means 13 for obtaining the position difference in the predetermined direction (reference axis direction) between the plurality of position information, and the inclination data of the reference line based on the position difference, and the inclination A frequency distribution calculating unit 14 for calculating a frequency distribution of data, a frequency distribution correcting unit 15 for deleting unnecessary slope data from the frequency distribution of the slope data, and a final reference line based on the corrected frequency distribution. It is characterized by comprising tilt calculation means 16 for calculating tilt data, and image rotation means 17 for rotating the image information of the mount based on the tilt data calculated by the tilt calculation means. A paper input device.

[0009]

Therefore, in the mount input device according to the present invention, a plurality of position information of the reference line is extracted from the position information extraction unit 1 from the image information of the mount read from the image input unit 11.
2, the position difference calculating means 13 calculates the distance difference in the X-axis direction from the position information, and the frequency distribution calculating means 14 calculates the X difference.
The inclination data of the reference line is obtained based on the difference in the axial distance, the frequency distribution of the inclination data is calculated, and the frequency distribution correction means 15 deletes unnecessary inclination data from the frequency distribution of the inclination data. The inclination calculating means 16 obtains the final inclination of the reference line based on the frequency distribution after the deletion, and the image rotating means 17 rotates the image information of the mount based on this inclination.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is an external view of a mount input device according to an embodiment of the present invention. This mount input device includes a flatbed image scanner 21, a computer main body 22,
It is composed of a display 23, a magnetic disk unit 24, a magneto-optical disk unit 25 and a mouse 26. The image scanner 21 reads the plate making frame 31, the layout frame 35, and the like drawn on the mount 30. The image scanner 21 includes a transparent reading table 211 and a light shielding door 212. The mount 30 is placed at a predetermined position on the reading table 211 with its image side facing down. The light-blocking door 212 is the reading table 21.
It has a function of fixing the backing sheet 30 on 1 and blocking light from the outside of the image scanner 21. The image scanner 21 having the above-mentioned configuration is provided with the reference axis 3
4, while the main scanning is performed in the X-axis direction and the sub-scanning is performed in the Y-axis direction, the mount on the reading table 211 is captured as gradation image data represented by gradation data for each of a plurality of pixels. The computer main body 22 is an image scanner 21.
The gradation image data captured from the image data is binarized, and processing such as inclination detection and rotation of the image data is performed based on the binary image data. The display 23 displays images such as line drawings and photographs drawn on the mount 30. The magnetic disk unit 24 is for writing program data and the like for various processes, and the magneto-optical disk unit 25 is for writing image data and the like. The mouse 26 is used for inputting instructions on the mount 30 and allocating photographs.

Next, the operation of the mount input device configured as described above will be described with reference to the flow chart shown in FIG. 5, FIG. 3 and FIG.
And FIG. 6 will be described. First, the scanner operator places the mount 30 on the reading base 211 of the image scanner 21 (SP1). At this time, the plate making frame 3 of the mount 30
1 is an angle θ with respect to the reference axis 34, as shown in FIG.
It is assumed that it is placed with a tilt. Image scanner 21
Performs main scanning in the X-axis direction, reads an image drawn on the mount 30 as, for example, 8-bit gradation image data (SP2), and inputs it to the computer main body 22.

The computer main body 22 determines a predetermined threshold value for binarizing the input gradation image data (SP3). Here, for example, a discriminant analysis method, a mode method, a P-tile method, a differential histogram method, or the like is used to determine the threshold value. Then, all the gradation image data are binarized according to the threshold value determined by SP3 (SP4), and the result is, for example, the binary image data 4 of FIG.
1'and 42 '. Subsequently, the computer main body 22 selects a binary value of a constant line interval (hereinafter referred to as "scan interval") from the binary image data obtained in SP4, for example, every 50 lines. A start point and an end point are determined for the image data (SP5). The start point and the end point are a point first recognized as a line drawing and a point finally recognized as a line drawing in reading each line of the main scan of SP2. For example, binary image data 4
In 1, the start points are 411 and 412 and the end points are 411 'and 412'. Then, the computer main body 22 calculates the difference in the X-axis direction distance between two adjacent start points on the side 45 from the binary image data (SP6). For example, the difference in distance between the start point 411 and the start point 412 in the X-axis direction is δ.

Next, the computer 22 creates a frequency distribution map as shown in, for example, FIG. 5 based on all the distance differences in the X-axis direction obtained in SP6 (SP7), and the frequency is calculated from the frequency distribution map. Low data (eg 511 and 513)
Or data that is not included in the preset range (for example ±
(Data representing a slope of 45 degrees or more) is deleted, and the average of the remaining data (for example, 512) is calculated (SP8). Based on the average value and the "scan interval" in SP2,
The tilt angle θ to be corrected is calculated, and the tilt direction of the mount 30 is obtained from the sign of the tilt angle θ (SP9). Then, the computer 22 rotates the binary image data based on the tilt angle θ and the tilt direction obtained in SP9 (SP10). The rotation is performed using, for example, affine transformation. The coordinates on the image of the mount 30 are (x,
y), the coordinates after rotating the coordinates are set as (X, Y),
It is assumed that the coordinates (x, y) are rotated by an angle (−θ) around the origin. According to the affine rotation, the coordinate after the rotation is “X = xcos (−θ) −ysin (−θ), Y =
xsin (−θ) + ycos (−θ) ”. In this way, by rotating all the coordinates on the image of the mount 30, the image of the mount 30 is rotated by (−θ). In this way, the inclination of the mount 30 can be corrected by correcting the inclination of the binary image data.

Further, the computer main body 22 is a mouse 2
In accordance with the operator's instruction using 6, the image data such as a photograph input to the magneto-optical disk 25 is superimposed on the corrected binary image data and displayed on the display 23 (SP11), and the magnetic disk is also displayed. Writing is performed to 24 (SP12).

As described above, in the mount input device of the present embodiment, unnecessary data is omitted from the tilt data of the captured image information, and the mount 3 is based on the remaining image data.
Since the inclination angle θ of 0 is detected, the reading line 4
3, when the colored ball 33 is read as an end point, dust on the reading table 211 is read as image data, or inclination data is obtained from the end points of the reading line 42 and the reading line 44. Even if it is obtained, the inclination of the image data can be corrected accurately.

The present invention is not limited to the above embodiment. For example, the image scanner 21 is not limited to the flatbed type scanner, and a drum type scanner, a video camera or the like may be used. In addition, in the method described above, the data regarding the start point,
That is, although the histogram is created and the tilt angle is calculated only for the side 45 of the plate making frame 31, the plate making frame 31 is based on the binary image data read in SP4.
Of the sides other than the side 45 (side 46, side 47 and side 4
Also for 8), it is possible to obtain the difference in the distance in the X-axis direction and calculate the inclination θ based on the result. here,
The difference in distance between the two points on the side 47 and the side 48 in the X-axis direction is calculated from the end point determined in SP5. Alternatively, in SP2, the line read by the image scanner 21 may be an arbitrary straight line instead of sticking to the sides forming the plate making frame 31. Then, the computer 22 can select the one with the least variation from the total of four histograms created for each side, and the tilt angle θ for correction can be calculated based on the histogram. Alternatively, the inclination is calculated based on each of the four histograms, information other than the plate making frame 31,
For example, the computer 22 deletes the histogram relating to the side 47 that may include a large number of colored balls 33 and the like as the start point and the end point, calculates the slope based on each of the remaining histograms, and takes the average to obtain the plate making. The tilt angle θ of the frame 31 can be obtained more accurately.

The method of rotating the image is not limited to the affine transformation, and the rotation can be performed by another method. Further, the difference in distance in the X-axis direction calculated in SP6 may be calculated from two start points extracted at fixed "scan intervals" (for example, every 4 scan intervals). Alternatively, instead of sticking to a fixed “scan interval”, a difference in distance in the X-axis direction is calculated for various “scan intervals”, and the tilt angle θ of the plate making frame 31 is calculated based on the difference in each distance. Based on this, the histogram may be created. In addition, the difference in the distances in the above embodiments uses the difference in the X-axis direction distance between the start point and the end point.
The histogram may be created using the difference in the Y-axis direction distance of the binary image data read in SP4.

[0018]

As described above, according to the present invention, a plurality of differences in the distance in the predetermined direction between two points on the reference line drawn on the mount 30 are calculated, and a histogram of inclination data created based on the result is calculated. Since the inclination data which is apparently not obtained by the difference in the distances obtained from the points on the reference line of the mount 30 is excluded and the inclination angle θ is determined based on the remaining inclination data, Even if the scanner recognizes scratches or dust on the mount 30 or a figure other than the reference axis as the reference axis, the image data can be corrected accurately.

[Brief description of drawings]

FIG. 1 is a block diagram of a mount input device according to the present invention.

FIG. 2 is an external view of a mount input device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a mount according to the embodiment.

FIG. 4 is an example of scanning in the same embodiment.

FIG. 5 is a flow chart for explaining the operation of the embodiment.

FIG. 6 is an example of a histogram in the example.

[Explanation of symbols]

 11 ... Image input means 12 ... Position information extraction means 13 ... Position difference calculation means 14 ... Frequency distribution calculation means 15 ... Frequency distribution correction means 16 ... Tilt calculation means 17 ... Tilt rotation means 21 ... Image scanner 211 ... Reading board 212 ... Shading Door 22 ... Computer main body 23 ... Display 24 ... Magnetic disk unit 25 ... Magneto-optical disk unit 26 ... Mouse 30 ... Mount 31 ... Plate making frame 32 ... Reference figure 33 ... Color ball 34 ... Reference axis 35 ... Layout frame 36 ... Contour 41, 42, 43, 44 ... Read line 41 ', 42' ... Binary image data 45, 46, 47, 48 ... Side

Front page continuation (72) Mayumi Ishimori Inventor Mayumi 1-5-1 Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd.

Claims (1)

[Claims] 1. An image input unit for taking in an image drawn on a mount, a position information extracting unit for obtaining a plurality of position information about a reference line drawn on the mount from the image information of the taken-in mount, and the plurality of units. Position difference calculation means for obtaining a position difference in a predetermined direction between the position information, and, based on the position difference, obtain inclination data of the reference line,
Frequency distribution calculating means for calculating the frequency distribution of the slope data, frequency distribution correcting means for deleting unnecessary slope data from the frequency distribution of the slope data, and the final reference axis of the reference axis based on the corrected frequency distribution. Based on the inclination data obtained by the inclination calculation means for obtaining the inclination data and the inclination calculation means,
An image input device for rotating the image information of the mount, the mount input device comprising: