JP3286646B2 - Print control method and apparatus for microfilm reader - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects and erases a black frame generated around an image on a negative microfilm,
Furthermore, the present invention relates to a print control method in a microfilm reader for printing out, and an apparatus directly used for implementing the method.

[0002]

2. Description of the Related Art In a negative microfilm, a portion without a transparent image is formed so as to surround the outside of an image of a document. When printing an image of a document from the microfilm, it is necessary to output a range larger than the document so that the entire range of the document does not deviate from the output range.

FIG. 7 shows a relationship between a microfilm and a print output. On the microfilm 10, images 12 and 14 of a document of a fixed size are recorded as negative images. Since the range 16 to be enlarged and projected on the screen is determined, when this range 16 is printed out, black frames 22 and 24 are generated on the print papers 18 and 20 outside the print images 12A and 14A of the images 12 and 14.

Therefore, a method of masking by automatically discriminating the black frames 22 and 24 has been proposed. Part 1
One method is that, when an image on a scanning line 26 at regular intervals (for example, 1 mm) is read by a line sensor, if the image signal continuously outputs a fixed number N (for example, 224) of black pixels, the black frame 22, 24. The fixed number N = 224 is, for example, a length corresponding to 14 mm on the document.

In this method, as shown by (A) in FIG. 7, from a coordinate X at which the distribution of pixels on the scanning line 26 changes from a white pixel to a black pixel, a coordinate x at which N black pixels are continuous is calculated. The coordinate X = x−N, which is detected and N pixels earlier than the coordinate x, is determined as a black frame. And at regular intervals (for example, 1mm
The black frame coordinates X _n , X _{n + 1} , X _{n + 2} ,... For the _n , _{n + 1} , _{n + 2} ,.
Is obtained in the same manner, and a black frame range, that is, a masking range connecting the coordinates X _n , X _{n + 1} ,... Is obtained.

Here, in the conventional apparatus, a frame of a microfilm is enlarged at a magnification for enlarging it to the size of a document (hereinafter, this magnification is referred to as a restoration magnification) and projected onto a screen, and an enlarged image appearing on the screen is used. A black frame was detected. In addition, the enlarged image projected on the screen is read by a line sensor that moves on the back of the screen, the black frame is deleted from the read image, and the image is printed out to the printer in the same size as the original.

[0007] On the other hand, frames of a specified size are imprinted on the microfilm at regular intervals. Since the size of the screen for reading and displaying a certain area from the microfilm is determined, the stop position of the microfilm and the like are determined. Depending on the relationship, a plurality of images may fall within the display range of the screen, or some of the images may fall outside the display range. Further, depending on the microfilm, a plurality of small documents such as bills and checks may be imprinted on a plurality of sheets or side by side, and in this case, a plurality of images will be included in one display range.

FIGS. 4A and 5A show the relationship between the microfilms 10A and 10B and the enlarged projection ranges 16A and 16B of the screen in this case. FIG. 4A shows a reduced image 12C of a document having a size smaller than A4, for example.
12D is transferred to the microfilm 10A, and one image 12D from the range 16A which is enlarged and projected on the screen.
Some of them are off. Here, the projection range 16 of the screen
A is, for example, A3 size.

FIG. 5A shows images 12E, 12e, 12F, 12f... Of the front and back of a bill or a check printed on a microfilm 10B. For example, a plurality of images are included in the A3 size screen projection range 16B.

[0010]

2. Description of the Related Art As described above, since an image enlarged at a restoration magnification is projected on a screen, the size of the image is determined to be necessary and sufficient to contain an image at this restoration magnification. However, the screen cannot be made too large relative to the reconstructed dimensions in order to avoid an increase in the size of the device. If the screen is to be made sufficiently small, a part of the projected image will be off the screen when the position of the projected image is shifted or tilted. At this time, there is a problem that a part of the image goes out of the print range. Further, when a plurality of images are included in the projection display range of the screen, unnecessary images or partially missing images are output to a printer or the like even if the black frame is deleted as described above.

Therefore, it is conceivable to delete and print unnecessary or partially missing images. However, in this case, if the printout is performed in the same size as the ranges 16A and 16B to be enlarged and projected on the screen, for example, in the A3 size, FIG.
(B), as shown in FIG.
18B, a large blank space is formed around the image (for example, 12C, 12f).

[0012] Further, there is a case where it is desired to print out on a sheet of the same size for the purpose of organizing documents. In this case, if the size of the image to be printed is not uniform, a large blank may be formed around the image, or a part of the image may protrude from the paper, which may make it difficult to view.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and even if the position of an enlarged projection image is slightly shifted or tilted without excessively enlarging the screen, all of the image is not lost without any loss of the screen. In addition to the display range, when the read range of the read image includes multiple images or when a part of the image is out of the display range, only the necessary images are extracted and unnecessary Images that are partially missing are deleted together with the black frame so that they can be output.
Further, it is a first object of the present invention to provide a print control method of a microfilm reader which makes it possible to effectively use paper and to make the print paper size easy to arrange documents so that it is easy to see. It is a second object of the present invention to provide an apparatus used directly in the method.

[0014]

According to the present invention, a first object is to enlarge and project a reduced image of a microfilm onto a screen,
In a method of detecting a black frame from the array of pixels indicated by an image signal obtained by reading and binarizing a projected image on the screen and erasing the black frame and printing out the black frame, the reduced image is reduced to the size of the original document. In the case where the read projection image includes a black frame of a plurality of images while projecting the image on the screen at a magnification lower than the restoration magnification for enlargement,
Writes other images to the black image except one or more selected images
The black image is replaced with the black image detected by the black frame detecting means.
Frame and synthesizing, erasing the synthesized black frame, expanded to the maximum size to enter the predetermined paper size the selected image,
This is achieved by a print control method for a microfilm reader, wherein the enlarged image is printed out on the paper size.

A second object is to provide an optical system for enlarging and projecting a reduced image of a microfilm onto a screen, image reading means for reading out an enlarged projected image on the screen, and binarizing the output of the image reading means. Binarizing means, black frame detecting means for detecting a black frame from an array of pixels indicated by the binarized image signal, masking means for erasing the detected black frame, and converting the image from which the black frame has been erased to a predetermined print paper size A print control device for a microfilm reader, the print control device comprising: a printout unit configured to input a restoration magnification for enlarging the image of the microfilm to the size of a document; A projection magnification setting unit for setting a magnification of the system, and a projection magnification setting unit for setting a magnification of the system other than an image selected when the projection image includes a plurality of black frames. The rewriting the image to black image black frame
Black frame combining means for combining with the black frame detected by the detecting means ,
Image enlarging means for enlarging the selected image to a maximum size that fits into a predetermined print paper size, wherein the masking means erases the black frame synthesized by the black frame synthesizing means, and the printing means The present invention is achieved by a print control device for a microfilm reader, which prints out an image enlarged by the image enlargement means on paper of a different size.

[0016]

FIG. 1 is an overall structural view of an embodiment of the present invention, and FIG.
3 is an operation flowchart showing the operation, FIG. 3 is a detailed operation flowchart of the black frame correction, FIG. 4 is a diagram showing an example of print output according to the present invention, FIG. 5 is a diagram showing another example of output, and FIG. FIG.

In FIG. 1, reference numeral 30 denotes a microfilm, which is wound around one of the two reels 32 and 34 and run. Light from a light source 36 is guided to the film 30 from below, and light transmitted through the film 30 is transmitted through a projection lens 38, an image rotation prism 40, reflection mirrors 42 and 44,
It is guided from the back to a screen 48 via 46. The screen 48 is set to, for example, A3 size.

On the back of the screen 48, a vertically long movable plate 5 is provided.
0 is provided so as to be movable in the horizontal direction, and a CCD line sensor 52 is attached to the movable plate 50. Therefore, by moving the movable plate 50 in the horizontal direction while reading the image incident on the line sensor 52, the screen 4
8 can be read.

Here, the magnification M of the optical system is variable by the magnification of the projection lens 38, and the magnification of the projection lens 38 is variable by the motor 38A. The magnification (reconstruction magnification) m required to restore the image reduced and projected on the microfilm 30 to the size of the document is input from the keyboard 38B.

Reference numeral 38C denotes a projection magnification setting means, which is a magnification M smaller than the restoration magnification m input from the keyboard 38B.
And set the motor 38A so that the magnification of the optical system becomes M.
Drive. Note that the restoration magnification m is not input from the keyboard 38B, but the cartridge 32 of the supply side reel 32 is used.
A (FIG. 1) may be provided with an identification mark using a barcode or the like, and the barcode may be read and automatically input.

This bar code may be attached to the top of the film or near each image printed on the film, or may be printed. Further, since the magnification M of the optical system is smaller than the restoration magnification m, the image is projected on the screen 48 with a sufficient margin around the enlarged projected image. For this reason, the image is less likely to come off the screen 48.

At the time of the first image reading, the output signal of the line sensor 52 is supplied to the first binarizing means 56 and the threshold detecting means 5 through the changeover switch 54 shown in FIG.
8 is input. At the time of the second image reading, the image is input to the second binarizing means 60.

As described above, the scanning lines 26 (FIG. 7) for detecting the black frame are read at regular intervals (for example, 1 mm intervals). Scan lines will remain. For example, when reading a 1 mm width with 16 scanning lines 26, there are 15 scanning lines between the scanning lines 26 for black frame detection. Scan line 26 for black frame detection
Scanning lines other than the above or the scanning line 26 for black frame detection
All scan lines including the threshold D
Used to determine _TH .

In the present invention, the scanning lines 26 for detecting the black frame at regular intervals are inputted to the first binarizing means 56, and the other scanning lines are inputted to the threshold value detecting means 58.

The threshold detecting means 58 has a histogram creating means 62 and a threshold calculating means 64. The histogram creating means 62 creates the density histogram shown in FIG. 6 using the image signal of the line sensor 52 that has read the scanning lines other than the black frame detection scanning line 26. This histogram shows the distribution of the number of pixels with respect to the density D of each pixel.

Here, the histogram creating means 62 generates the n-th black frame detection scanning line 26 (n) and the preceding (n)
A histogram is obtained from 15 scan lines between the (-1) th black frame detection scan line 26 (n-1). The threshold value calculating means 64 calculates a threshold value D _TH (n) used for the n-th black frame detection scanning line 26 (n) using the histogram.

For example, in the histogram shown in FIG.
Mountain P ₁ of the white side is to the outside of the film 10 of the image 12, 14 in FIG 7 could be a transparent portion. The mountain P ₂ on the black side is formed by the background in the images 12 and 14. Therefore necessary image will be distributed between the two Tsunoyama P ₁ and P _2. The threshold value calculating means 64 obtains the density D _TH of a fixed ratio (for example, 70%) with respect to the density D ₂ of the peak P ₂ as a threshold for binarization, and stores the result.

In the threshold value detecting means 58, the (n-1) th and n-th black frame detecting scanning lines 26 (n-1),
The threshold value D _TH (n) is obtained as described above using 15 scan lines between 6 (n). This threshold D
_TH (n) is used for the black frame detection of the n-th black frame detection scanning line 26 (n) to be subsequently read. In this case, (n
A histogram may be created including the (-1) -th black frame detection scan line 26 (n-1) and a certain range of scan lines before the scan line 26 (n-1).

The first binarizing means 56 converts the image signal of the n-th scanning line 26 (n) using the threshold value D _TH (n) thus obtained by the threshold value detecting means 58. Binarize. The binarized signal is input to the black frame detecting means 66, where the black frame is detected and stored.

The black frame detecting means 66 can detect the black frame 2 by various methods.
2, 24 (see FIG. 7) are detected. For example, as described above, the scanning line 26 may be included in the range of the image 12, and the black frame may be detected because N black pixels continue in succession (see FIG. 7A). Also, as shown in FIG. 7B, of the N (for example, 160)
% (For example, 30%) is a black pixel, the presence of a black frame is detected, and Nb is calculated from the coordinate x at which the number of black pixels becomes a%.
The coordinates X = x−Nb that are traced back by pixels may be determined as a black frame.

In this case, the Nb pixel sets the range of the N pixel to (1
-B): Indicates the number of dots up to the coordinate to be divided into the ratio of b, and it is desirable to set b ≒ a. In the above description, the case where the scanning enters the images 12 and 14 from the outside of the images 12 and 14 is described. What is necessary is just to reverse the white pixel. When the black frame is detected by various methods in this manner, the black frame range is determined by connecting the obtained black frame points to each scanning line 26, and the black frame range is stored.

On the other hand, on the screen 48, certain areas (screen projection ranges) 16A and 16B of the microfilm 30 are provided.
Is projected and displayed. At this time, on the screen 48,
As shown in FIGS. 4A and 5A, a plurality of images may be included at the same time. The microfilm 10A of FIG.
Image 12C and image 12
D is included. Further, front and back images 12E, 12e, 12F, 12f, 12G, and 1 such as handprints are included in a screen projection range 16B of the microfilm 10B in FIG.
2g, etc.

The black frame 22A in the fixed area 16A of FIG.
The black frame is detected by the black frame detecting means 66 and stored. From the fixed area 16B of FIG. 5, an appropriate area 16C including a necessary image (for example, 12f) is extracted by a trimming means (not shown), and a black frame 22B of the extracted area 16C is detected by the black frame detecting means 66. And stored.

In FIG. 1, reference numeral 67 denotes a synthesizing correcting means. This black frame combining means 67 is necessary when a plurality of images are included in the fixed area 16 (FIG. 7), 16A (FIG. 4) or the extracted area 16C (FIG. 5) to be output to a printer or the like. Select only the image and write the unselected image to the black image
In other words, the black image is detected by the black frame detecting means 66.
And the black frames 22A and 22B .

For example, in the case of FIG. 4A, one of the two images 12C and 12D is set as a selected image and the image 12D is selected.
Area is rewritten to a black image . Similarly, in the case of FIG. 5A, one image, for example, 12f is selected as a selected image, and the area of another image is rewritten to a black image . The area rewritten into the black image in this manner is combined with the black frame detected by the black frame detection means 66 and stored.

As the selected image, an image at a predetermined position in the fixed area 16A or the extraction area 16C can be automatically selected. For example, an image at the left end, right end, upper left corner, lower left corner, or the like is set as a selected image. The selected image may be selected by inputting coordinates on the screen 48 from a keyboard. Further, the image read by the line sensor 52 may be displayed on a display such as a CRT or a liquid crystal panel, and the selected image may be designated on the display by a touch panel, a mouse, a keyboard, or the like.

As described above, by the first image reading,
Detection of a black frame and detection of a threshold value D _TH (n) are performed. Then, at the time of the second image reading, binarization is performed by the second binarization means 60 using the obtained threshold value D _TH (n). That is, the image near the n-th scanning line 26 (n) is binarized using the threshold value D _TH (n), and the threshold value D _TH in the vicinity is sequentially read from the memory according to the image reading area. Read and use.

The binarized output signal is supplied to the image processing means 6
8 is input. This image processing means 68 enlarges /
Various spatial filtering processes such as compression, edge enhancement by differential processing, thinning processing, and dither processing are performed.

The image signal that has undergone such image processing is subjected to masking processing in an unnecessary range such as a black frame by the masking means 70. The black frame used here is obtained by rewriting an unnecessary image into a black image by the black frame synthesizing means 67 and detecting the black frame.
A black frame synthesized with the black frame detected by the output unit 66 is used.

The image signal from which the combined black frame has been deleted is enlarged by the image enlargement means 72. The image enlarging means 72 enlarges the selected image to a maximum size that can fit in a predetermined print paper size (for example, A4). That is, the selected image is enlarged in the vertical direction and the horizontal direction at the same time, and is enlarged until either direction becomes full of the predetermined sheet size. 12C 'of FIG. 4B and FIG.
This enlarged image is shown at 12f 'in (B).

The enlarged images 12C and 12f are input to the printing means 76. The printing means 76 prints the enlarged image 12 on papers 18a and 18b of predetermined dimensions.
C 'and 12f' are printed out. At this time, since the combined black frame is masked and erased, images other than the selected images 12C and 12f are not printed.

Next, the operation will be described with reference to FIG. First, a reduction ratio m of the image projected on the microfilm 30, in other words, a magnification m for restoring the frame of the microfilm 30 to the size of the original (reconstruction magnification) m is input from the keyboard 38B or the like (step 100). Projection magnification setting means 3
8C determines the magnification M of the optical system smaller than the restoration magnification m (step 102) and drives the motor 38A (step 104).

When the setting of the magnification M of the optical system is completed (step 104), projection is started, and an enlarged image is projected on the screen 48 (step 106). By the first scan (image reading) by the line sensor 52 (Step 1)
08) As described above, a histogram is obtained by scanning between the scanning lines 26 at regular intervals (step 11).
0), the threshold value D _TH is obtained (step 112).

The scanning line 26 has the threshold value D _TH
, And is binarized by the first binarizing means 56 (step 114), and a black frame is detected (step 116) and stored. The above operation is repeated, and when processing is completed for the entire image area (step 118), black frame synthesis is performed (step 120).

This black frame synthesis processing (step 120)
One or more images from the black frame obtained in step 116 and select, rewriting other than the selected image to a black image, a black frame
The image is synthesized with the black frame detected by the detecting means 66 . This black frame synthesis processing is performed according to the procedure shown in FIG. First, after detecting a black frame (step 116), it is determined whether or not a plurality of images are included (step 120A).

If a single image is included, it is not necessary to combine it with a black frame. If a plurality of images are included, only the necessary images are selected (step 120B), the other image range is rewritten to a black image (step 120C), and the rewritten range is detected by the black frame detected by the black frame detecting means 66. to include to make the synthesis of the black frame (step 120D),
Memory and start the second scan (step 12
2).

In the second scan, the image is _divided into two using the threshold value D _TH obtained from the histogram in step 112.
The image is binarized (step 124), and image processing is performed using the binarized image (step 126). Step 1
The black frame range obtained in step 16 and combined in step 120 is masked and erased (step 128). The image enlarging means 72 enlarges the selected image to a maximum size that fits into a predetermined paper size (step 130). The printing means 76 prints out and prints on the paper of the predetermined size (step 134).

In the above embodiment, the magnification M of the optical system is automatically set by the projection magnification setting means 38C. However, in the present invention, the magnification M of the optical system may be manually set by a projection lens composed of a manual zoom lens, or may be set to a fixed magnification by using a projection lens composed of a single magnification lens. The predetermined print paper size is set in advance from a keyboard or the like, or only a single size paper is used.

[0049]

As described above, according to the first aspect of the present invention, when a plurality of images are included in a fixed area to be enlarged and projected on a screen, a necessary image (selected image) is left and another image is set to a black frame. Was rewritten with the same black image as that detected by the black frame detection means.
Since the image is synthesized with the black frame and the synthesized black frame is masked, only the necessary image from which the unnecessary image has been removed can be output. Here, since the enlarged image projected on the screen is smaller than the document, the projected image is less likely to come off the screen, and the screen does not need to be unnecessarily enlarged and the print does not become smaller than the document.

Further, since the selected image is enlarged to the maximum size that can be accommodated in the predetermined print paper size and printed out on the print paper of this size, it is possible to output the print of the maximum size suitable for the paper size. it can.
For this reason, the printout is not unnecessarily printed on a large sheet, and a large blank is not formed on the sheet. Here, the size of the print paper is unified, which is convenient for organizing documents, and the image is enlarged to the maximum size on this paper, so that the image is easy to see. According to the second aspect of the present invention, there is provided an apparatus directly used for performing the method.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of the operation.

FIG. 3 is a detailed operation flowchart of black frame correction.

FIG. 4 is a diagram showing a print output example according to the present invention.

FIG. 5 is a diagram showing another print output example.

FIG. 6 is a diagram showing a histogram.

FIG. 7 is a diagram illustrating the relationship between a microfilm and print output.

[Description of Signs] 10A, 10B, 30 Microfilm 12, 14 Image 12C, 12f Selected Image 12C ', 12f' Enlarged Image 16, 16A, 16B Screen Enlarged Projection Range 16C Extraction Area 18, 18A, 18B, 20 Print Paper 18a , 18b Paper of fixed size 22, 22A, 22B Black frame 38b Keyboard as restoration magnification input means 52 Line sensor as image reading means 56 First binarization means 66 Black frame detection means 67 Black frame synthesis means 68 Image processing means 70 masking means 72 image enlarging means 76 printing means M magnification of optical system m restoration magnification

Claims (2)

(57) [Claims] 1. A reduced image of a microfilm is enlarged and projected on a screen, and a black frame is detected by a black frame detecting means from an array of pixels indicated by an image signal obtained by reading and binarizing the projected image of the screen. And printing out the reduced image by enlarging the reduced image at a magnification lower than the restoration magnification for enlarging it to the size of the document and projecting the reduced image on the screen, while the readout projected image includes black frames of a plurality of images. Rewriting other images to black images except one or a plurality of selected images, combining the black image with the black frame detected by the black frame detecting means, erasing the synthesized black frame, and replacing the selected image with the black image. A printer for a microfilm reader, characterized in that it is enlarged to a maximum size that fits into a predetermined paper size, and the enlarged image is printed out on the paper size. Control method. 2. An optical system for enlarging and projecting a reduced image of a microfilm onto a screen, image reading means for reading an enlarged projected image of the screen, and binarizing means for binarizing an output of the image reading means. A black frame detecting means for detecting a black frame from an array of pixels indicated by the binarized image signal, a masking means for erasing the detected black frame, and a printing means for printing and outputting an image from which the black frame has been erased to a predetermined print paper size And a restoration magnification input means for inputting a restoration magnification for enlarging the image of the microfilm to the size of a document, and setting the magnification of the optical system to a magnification lower than the restoration magnification. A projection magnification setting means for writing, and when the projected image includes a black frame of a plurality of images, other images are written as a black image except for the selected image. In other words, it is detected by the black frame detecting means.
It includes a black frame combining means for combining the black frame that, the image enlarging means for enlarging the maximum size to enter the predetermined print paper size the selected image, the masking means before
A print controller for erasing the black frame synthesized by the black frame synthesizer, and printing the image enlarged by the image enlarger on the paper of the predetermined size. .