JPS6356533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for automatically correcting image defects such as pinholes that occur when a document is photographed from a master plate in a plate-making process for printed matter.

The manuscripts used for photoengraving, such as text, paintings, figures, and illustrations, are not always completely combined into a single sheet, but rather multiple sheets of manuscript are pasted together on a single sheet of paper or plastic film. When this is photographed for plate making, a negative image is generally formed, but due to dirt on the plate itself, dirt on the document holding glass of the camera used during photography, dirt on the automatic film processor, etc. In the image obtained by photographing, pinholes, scratches, and smudges cause missing image areas (missing areas), which are expressed as images in the final printed matter and become smudges.

In the photoengraving process, manuscripts can be broadly divided into text manuscripts and picture manuscripts. Text originals are generally photographed with a reflection type camera and turned into negative film, but for the reasons mentioned above, missing portions of the image such as pinholes, dirt, scratches, etc. occur in most cases. If you leave this as it is, it will become a stain on the final print, so
Generally, it is necessary to fill in the missing parts of the image with light-shielding ink (usually black or red).
Conventionally, for painting, ``Lamp Black'' manufactured by Toyo Ink Mfg. Co., Ltd. or ``Elbe'' manufactured by Yotsuwa Sangyo Co., Ltd. was applied to a brush and the painting was done manually. In addition, in the case of narrow, intricate parts, he patiently filled in commercially available ``opaque'' or ``ink'' with a thin brush. This is a simple task;
In the case of manual work, the ``opaque'' and ``ink'' applied with sweat or the like had the disadvantage of easily bleeding and staining.

Figure 2 is an explanatory diagram of film for plate making of negative images obtained by photographing, 1 is the film base, 2
3 is the photosensitive agent, 3 is the image area, and 4 is the missing stain that needs to be covered. The thickness of film base 1 is
The thickness of the photosensitive agent 2 is several microns.

Although the above explanation has been made regarding negative film taken with a reflection type camera, the same drawbacks occurred in the case of negative film produced with a reversal printer during the plate-making process.

In addition, in the case of positive images, pinholes, scratches,
Since the stains are formed on the film as streak-like stains, it is necessary to scrape off the streaks on the film with a sharp cutter, needle, or the like.

FIG. 1 is an explanatory diagram of a plate-making film for the above-mentioned positive image obtained by photographing, in which 1 is the film base, 2 is the photosensitive agent, 3 is the image area, and 4 is the dot shape or line shape that needs to be scraped off. It is a line-like stain such as.

The present invention eliminates the simple manual work required to correct missing stains such as pinholes or line-like stains as described above. Positioning is performed using a digitizer, and contamination such as pinholes is detected and corrected using the signal from the digitizer and the optical detection signal of the image film obtained by photographing the reference image. This system detects and corrects defects such as pinholes based on the signal detected by a standard image and the image film obtained by photographing the image using a standard detector. In the case of stains, the missing parts of the image are filled in with an inkjet device, and in the case of streak-like stains, they are scraped off with a cutter, needle, etc.

The first aspect of the present invention is to provide a digitizer for positioning areas other than parts such as characters and figures of a manuscript such as a block copy, and a digitizer for detecting an image defect in the area of an image film obtained by photographing the manuscript. This image correction apparatus includes an optical detector and a correction apparatus equipped with an inkjet device and/or a cutting device operated by the detection signal.

The present invention will be explained in detail with reference to the drawings.

Figure 3 shows a digitizer. A block copy 5 as a manuscript is set here, a cursor 6 is used to position the part of the block copy 5 other than the characters, figures, etc., and the signal is sent to the correction device. Many manuscripts are made by pasting together many manuscripts, and there are many parts that are not manuscripts, so this is something that can be detected. The correction section is, for example, a drawing machine shown in FIG. 4, and constitutes a correction device. An image film (not shown) obtained by photographing the printing plate is placed on the film holder 7, and the output section 9 supported by the output section supporter 8 outputs the above image in response to the positioning signal from the digitizer. The optical detector installed in the correction device detects pinholes, scratches, and other stains on the image film other than characters and figures, and detects and corrects them using the optical detector installed in the correction device. Fill it in with the inkjet device installed in the device, or scrape it off with the cutting device. The case where the output section is an inkjet is shown in FIG. 5, and the case where the output section is a cutting device is shown in FIG. In FIG. 5, the output signal from the digitizer of the positional information of portions of the document other than portions such as characters and graphics is once stored in a floppy disk or the like or directly input to the charging electrode 10 on-line. and,
For example, as shown in FIG. 5, a fluorescent lamp 17 is placed on the back side of the drawing machine holder 15, and an optical detector 18 is used to detect parts of the image film obtained by photographing the original, other than the parts such as characters and figures. An image film is set in a drawing machine designed to detect light, and the detector 18
to detect locations where contamination such as pinholes has occurred. A positioning output signal from the digitizer and an A/D signal from the optical detector of the correction device
The converted detection signal is connected to an AND circuit or NAND.
Input processing is performed to a processing means such as a circuit to detect areas to be corrected in areas other than areas such as characters and figures on the image film, and based on the detection signal, ink in the ink fountain 11 is controlled by an ultrasonic generator. 12,
It is ejected by the pressurizing pump 13, and the charging electrode 10
It is charged with electricity, deflected by the deflection electrode 14, collides with the image film 16 (for example, negative image film) of the drawing machine holder 15, and fills out pinholes, scratches, and other missing stains in areas other than areas such as characters and figures. It is.

In this case, by preparing multiple inkjet nozzles perpendicular to the scanning direction, changing the voltage of the deflection electrode, or swinging the inkjet part, it is possible to deal with large missing areas.
The scanning density can be coarser and the processing time is faster.

When cutting with a cutting tip as shown in Fig. 6 (for example, when obtaining a positive image film from a positive original, or when obtaining a positive image film from a negative image original), the position information from the digitizer is used. An optical detector (not shown) is attached to the cutting tip according to the signal.
The cutting device 19 detects spots, scratches, etc. that occur in parts other than the parts such as characters and figures.
Scrape it off. The width of the blade of the cutting device 19 is
They can be changed depending on the situation, and a plurality of them may be provided as shown in FIG.

The second aspect of the present invention also provides an optical detector for detecting a manuscript such as a block copy, an optical detector for detecting an image film obtained by photographing the manuscript, a detection signal from the detector, and the optical detector for detecting an image film obtained by photographing the manuscript. This is an image correction device that is equipped with an inkjet device and/or a cutting device that operates based on a signal from a collation means that compares a detection signal from a target detector with a detection signal from a target detector. Prepare two machines,
By attaching an optical detector to the scanning head of one of the drafting machines, an optical detector is configured to detect parts such as characters and figures of originals such as block copies, as well as other parts. or a negative image) and scan the image. An inkjet device or a cutting device and an optical detector are attached to the output section of the scanning head of the other drawing machine to form a correction device, and an image obtained by photographing the film original with a positive image or the film original with a negative image. Scan the film. The signal from the optical detector reading the film original and the signal reading the image on the image film from the correction device's detector are synchronized and connected to an AND circuit or a NAND circuit. Input it into the verification method and compare it to find any dirt such as noise-like pinholes, scratches, omissions, etc. that are not in the original, or
While spot stains, line stains, etc. are detected, the image film is corrected based on the signals by an inkjet device or a cutting device provided in the correction device.

The present invention is applicable to portions other than characters and figures of an image film obtained by photographing a block copy, a manuscript, or
It is possible to automatically detect and correct pinholes, scratches, dots, and line-like stains that occur in characters and graphics, eliminating the need for traditional manual work. It is extremely efficient as it eliminates processes and helps save labor and rationalize.

[Brief explanation of the drawing]

FIG. 1 is a side view illustrating a plate-making film for positive images, FIG. 2 is a side view illustrating a plate-making film for negative images, and FIG. 3 is an explanatory diagram of a digitizer as a component of the present invention. 4 is an explanatory diagram of a drawing machine as a component of the present invention, FIG. 5 is an explanatory diagram of an inkjet device as a correction unit of the present invention,
FIG. 6 is an explanatory diagram of a cutting device as a correction section of the present invention. 1...Film base, 2...Photosensitizer, 3...
Image section, 4... Dirt, 18... Optical detector, 19
...Cutting device.

Claims (1)

[Scope of Claims] 1. A digitizer for positioning areas other than parts such as characters and figures of a manuscript such as a block copy, and detecting an image defect within the positioning area of an image film obtained by photographing the manuscript. An image correction device comprising an optical detector that detects an image, an inkjet device or a correction device that operates according to the detection signal, and a cutting device. 2. An optical detector that detects a manuscript such as a block copy, an optical detector that detects an image film obtained by photographing the manuscript, a detection signal by the detector, and a detection signal by the optical detector. An image correction device comprising a correction device equipped with an inkjet device and/or a cutting device that operates based on a signal from a collation means.