JPS623375A - Image editing device - Google Patents

Abstract

PURPOSE:To correct the correction of image data without deteriorating the image quality by correcting only the relevant part of the original image data according to the difference between the corrected image data and the image data preserved in a copy. CONSTITUTION:The corrected image data is transferred to a display memory 10 from a page memory 11 after magnification and reduction and preserved in the memory 11 in the form of a copy of the same size as the original. When correction is through with the image data on the memory 10, a arithmetic part 14 performs a logic operation between the corrected image data in the memory 10 and that preserved in a copy in the memory 11. Then the corrected area of the image data is extracted. The image data on the corrected area is restored to the size of the original image size and transferred to the memory 11. Then the correction is given to the extracted corrected part of the original image data on the memory 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an image editing device that can effectively perform image editing such as additional writing while displaying a plurality of original images in an overlapping manner on a display.

[Technical background of the invention and its problems]

Recently, with the development of information processing technology, office work is being digitized. As part of this, converting document images into electronic files is attracting a lot of attention.

To convert document images into electronic files, paper files, which are the mainstay in the office, are converted into electronic files by, for example, reading and inputting drawing images written on paper using a scanner, and this electronic image data is filed in a storage device. It is something. At this time, it is necessary to modify and re-register the filed image data, or to modify and output the image data.

Therefore, an important issue is how efficiently such image data correction processing can be performed.

Note that image data correction processing includes, for example, additional writing of image data by hand, additional writing processing of character patterns and graphic patterns, enlargement/reduction processing of image data,
It consists of image rotation processing, cutting and pasting processing by specifying areas, etc.

The device responsible for such image correction processing is an image editing device, and is configured as shown in FIG. 7, for example. To briefly explain the basic configuration of this image editing device, the CPU
controls the operation of each section, which will be described later, through the system bus 2. This CPUI operates by setting an operating program area and a variable area on RAMa. The CPU stores management information regarding image data in the hard disk 4 via the system bus 2, and also inputs coordinate information necessary for image editing processing from the tablet 5.

The first and second address generators 6.7, which operate under the control of the CPUI, each generate address data,
This is sent to the display memory (DM) via address buses 8 and 9.
) 10 and page memory (PM) 11, respectively.

The display memory 10 stores image data to be displayed on a display (CRT) 12, and the page memory 11 stores a plurality of image data to be used for image editing in page units.

Therefore, in the display memory 10 and page memory 11,
Expansion/through the first and second data buses 18.19
Reduction unit 13, image calculation unit 14, scanner I/F 15, printer I/F 1B, and optical disc I/F 17
are connected to each other. Image data is mutually transferred between the above-mentioned units via the first and second data buses 18, 19. Note that this image data transfer is performed in synchronization with each other via the control bus 20 that connects each of the above-mentioned sections.

Here, the enlargement/reduction unit 13 connects the data bus 18°1
The image data transferred via the CPU 9 is enlarged/reduced under the control of the CPUI, and the image operation section 14 performs logical operations (negation, sum, product, etc.) on the image data. It is something to be carried out.

Image editing processing is performed by processing the image data by the enlargement/reduction section 13 and the image calculation section 14. The scanner I/F 15 is for inputting image data read by the scanner 15a, and the printer I/F 1B is for printing out the image data via the printer lea. The optical disk I/F 17 is an optical disk 1 serving as an external memory.
7a is connected to input and output image data.

In the image editing apparatus configured as described above, for example, image data read and input by the scanner 15a or image data read from the optical disk 17a is transferred to a predetermined image area of the page memory 11, and is processed in units of images (pages). It is stored in .

The data is then transferred from this page memory 11 to the display memory 1o and displayed on the CRT 12. At this time, the image data read out from the page memory 11 is enlarged/reduced by the enlargement/reduction section 13 as required, and then stored in the display memory 10. The CRT 12 displays the image by reading out the image data stored in the display memory 10 at a predetermined cycle.

When a plurality of images are displayed in a superimposed manner on the CRT 12, this is achieved by sequentially writing each image data of the plurality of images stored in the page memory 11 into a predetermined address area of the display memory 10. .

Specifically, each image data is written to a predetermined address area on the display memory 10 in accordance with the display position on the CRT 12, so that each image is
It will be displayed at T12.

However, when modifying image data whose display is controlled in this manner, there are the following problems.

That is, the image display area (image display area) of the display 12 is often small compared to the size of the image data stored in the page memory 11. Therefore, the 81st 'J I
：Ioyo、、：上ia ``% '＞ ) and 1,1□
Up. 1st. The original image A is reduced and transferred to the display memory IO, and the reduced image B is displayed on the display 1.
2, and the display memory 1 is displayed for this display image B.
Image correction processing is performed on 0.

However, by modifying the image B reduced and displayed in this way and creating the modified image C on the display memory 10,
When the original image A on the page memory II is corrected based on this corrected image C, a calculation error accompanying the enlargement process of the corrected image C causes, for example, diagonal lines due to quantization errors, as shown in the corrected image. A large image distortion (so-called jaggedness) E occurs. This image distortion can be dealt with, for example, by interpolation processing, but it is extremely difficult to perform such processing.

In addition to image distortion caused by such diagonal lines, for example, when a correction target area F is specified and correction processing is performed as shown in FIG. 9, the image data of the corrected image area G may be enlarged. When the image H is inserted into the corresponding area of the original image A on the page memory 11 and concatenated, a shift is likely to occur in the concatenated portion I of the image data due to a quantization error accompanying the enlargement process.

Such occurrence of image distortion and deviation of image data is unavoidable when enlarging/reducing the image data transferred between the page memory 11 and the display memory 10, and the original image due to the correction processing is a major cause of quality deterioration.

[Purpose of the invention]

The present invention has been made in consideration of these circumstances, and its purpose is to effectively modify image data without degrading the quality of the original image stored in the page memory. The purpose of the present invention is to provide an image editing device that can perform the following functions.

[Summary of the invention]

According to the present invention, image data is reduced/enlarged and transferred between a page memory that stores original image data and a display memory that stores image data to be displayed on a display, and is stored in the display memory and displayed on the display. ,
When correcting the corresponding original image data on the page memory according to the image data that has been corrected on this display memory, the image data stored in the display memory is copied and saved in the same size, and the image data that has been corrected is The difference between the image data on the display memory and the copy-saved image data is determined, and only the corresponding portion of the original image data on the page memory is corrected according to the difference in image data.

〔Effect of the invention〕

Thus, according to the present invention, the image data transferred from the page memory to the display memory is copied and saved in the same size, and then subjected to image correction processing, and the image data that has been corrected on the display memory and the above-mentioned copy and saved are The difference with the image data is calculated. Then, the image data on the page memory is corrected only for the corrected part of the image indicated by the difference data, so the image data other than the image area targeted for correction of the original image on the page memory is saved as it was. be done.

Therefore, the quality of the original image does not deteriorate due to the image correction process, and the image correction process can be performed easily and effectively.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

This apparatus is basically constructed as shown in FIG. 7, and its feature is that image data is corrected in accordance with the processing procedure shown in FIG.

That is, in this device, a plurality of original images, for example, a second
As shown in the figure, tables are managed on the hard disk 4, and original image data for one summer to be edited is stored in the page memory 11 as shown in FIG. The data is transferred to the computer and displayed on the display 12 as shown in FIG.

Note that table management for a plurality of original images is performed by individually registering management information regarding each image data using its image data number, as illustrated in FIG. Then, for each original image, the storage area (storage start address) of the image data on the page memory 11 and the image size (xn, yn) are stored, and the display of the image data on the display memory IO ( The above-mentioned management table is constructed by storing each of the storage areas as display position information (xi, xe, yi, ye), and adding priority information indicating the stacking order when displaying a plurality of images in a stacked manner.

To explain the procedure of the image correction process shown in FIG. 1, first, the image data to be used for image data correction is enlarged/reduced (including same size) from the page memory 11 and transferred to the display memory IO. Then, display memory IO
The image data transferred to is copied and saved to the same image size (step a). This copy storage of image data is performed by simultaneously writing the image data to be written into the display memory IO into another storage area on the page memory 11.

The same image data written in the display memory 10 in this way is copied and saved, for example, on the page memory 11, and then stored in the display memory 10 and displayed on the display 12. Correction processing is performed (step b). This image data modification process is performed by inputting handwritten data via the tablet 5 or by other methods.

When the correction processing of the image data on the display memory lO is completed, the display memory lO is
A logical operation is performed between the corrected image data on O and the image data copied and saved on page memory 11, and the corrected portion is extracted (step C). When the image data is given as a binary image, extraction of the image corrected portion by this logical operation is performed by exclusive OR processing or the like.

Through this processing, for example, a black addition area and a white deletion area for the original image transferred to the display memory 10 are respectively determined.

Thereafter, the image data in the area to be corrected is restored to the original image size that has been enlarged/reduced (including the same size) and transferred to the page memory 11. Then, addition processing to the original image data on the page memory 11 is performed for the black addition area (step d), and erasing processing for the original image data on the page memory 11 is performed for the white deletion area (step e). ).

Note that if the image data correction process on the display memory 10 is interrupted midway, the image data is retransferred from the page memory 11 to the display memory 10 and the image is restored.

The above is the characteristic image correction processing procedure of this apparatus.

This image correction processing will be explained in more detail with reference to FIG. Image B is copied to a predetermined image area on page memory 11 and saved image K1
．． K2 respectively. These two copy saved images Kl.

K2 is prepared to separately obtain the black added portion and the white erased portion for the reduced image B.

When the reduced image stored in the display memory 10 is subjected to image correction processing, for example, interactively and the corrected image C is obtained, image data obtained by inverting the black and white of the copy-saved image Kl and the above-mentioned corrected image The logical product with C is calculated,
A corrected partial image Ll of the black addition area is obtained. Similarly, the logical sum of the image data obtained by reversing black and white of 2 in the copy-saved image and the corrected image C is determined, and a corrected partial image L2 of the white erased area is determined.

After that, the modified partial image Ll is enlarged to the same image size as the original image A, and this enlarged and corrected image is ORed and added to the original image A on the page memory 11, so that the image added by the image correction is added. Only the data of the black image portion is added to the original image A to obtain its modified original image p1.

Furthermore, since this image has a white erased area as described above, the corrected partial image L2 is enlarged to the same image size as the original image A, and this enlarged corrected image is used as the original image on the page memory 11. If the logical product is added to image A (corrected original image DI with black areas added), only the data of the white image part erased by image correction will be added to the original image A (corrected original image with black areas added). Di) to obtain the corrected original image D2.

Through such image correction processing, the original image A
The image data other than the part to be corrected will be saved as is, and only the image data at the corrected part will be rewritten.

Therefore, the quality of the original image data does not deteriorate due to the influence of quantization errors associated with the enlargement/reduction processing during transfer between the display memory lO and the page memory ti, unlike in the conventional case. Since only the image data of the corrected portion is corrected on the page memory 11, effective correction processing of the original image data is performed here.

In the above example, the copy and save image of the reduced image B is Kl.
Although two sheets are prepared as shown in FIG. 6, only one sheet may be prepared as shown in FIG.

In this case, the black added partial image Ll is obtained by calculating the exclusive OR of the copied saved image and the corrected image C, and the black added partial image @Ll is inverted in black and white, and the image data and the above corrected image C are obtained. The white-erased partial image L2 may be obtained by calculating the logical sum of the white-erased partial image L2. Even in this case, the original image A on the page memory 11 can be effectively corrected, similar to the example shown in FIG. 5 described above.

As explained above, according to the present invention, the display memo IJIG
Copy and save the image data stored in the same image size, and perform logical processing on the image corrected on the display memory 1 and the image that has been copied and saved to obtain only the image data of the corrected portion, and create this image data. Since the original image on the page memory 11 is corrected according to the original image, only the corrected portion can be effectively corrected without deteriorating the quality of the original image.

In other words, the image data is transferred to the display memory 10 for image correction, and the corrected image data is transferred to the display memory 10.
Even if the image is transferred from the original image to the page memory 11 and subjected to image correction processing, this will not cause problems such as image distortion in the diagonally shaded areas of the original image or deviations in the connected areas of the images. .

Therefore, great practical effects such as being able to effectively perform image correction under simple control can be achieved.

Note that the present invention is not limited to the embodiments described above. For example, although the basic configuration of the device is shown in FIG. 7, the bus configuration etc. may be determined according to the specifications of the device. Further, the present invention is applicable not only to transferring image data by enlarging/reducing it, but also to transferring it at the same size. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the flow of image correction processing in an embodiment of the present invention, FIG. 2 is a diagram illustrating an example of the configuration of an image management table in the embodiment, and FIG. 3 is a diagram showing the overlapping of images in the embodiment. FIG. 4 is a diagram showing an example of how image data of the area is stored in the page memory; FIGS. 5 and 6 are diagrams each showing a specific flow of image correction processing in the embodiment apparatus; FIG. 7 is a basic schematic configuration diagram of an image editing device, and FIGS. 8 and 9 are diagrams for explaining the flow of image correction processing in the conventional device and its problems, respectively. 1...CPU, 3...RAM, 4...Hard disk, 5...Tablet, 6.7...Address generation section, 10...Display memory, 11...Page memory, 12. ... Display, 13... Enlargement/reduction section, 14... Image calculation section. Applicant's agent Patent attorney Takehiko Suzue Figure 11 Figure 6

Claims (3)

[Claims] (1) A page memory that stores original image data, a display memory that stores image data to be displayed on the display, and an image processing unit that reduces and enlarges the image data and transfers the image data between this display memory and the page memory. and an image correction processing section that corrects the image stored in the display memory and displayed on the display, and the image correction processing section that corrects the image stored in the display memory before the image correction processing section corrects the display image. Copy and save the image data, find the difference between the image data on the display memory that has been corrected by the image correction processing section and the image data that has been copied and saved, and store the image data in the page memory according to the difference between the image data. An image editing device characterized by modifying stored original image data. (2) The image editing device according to claim 1, wherein the image correction processing section corrects the display image interactively. (3) The image editing device according to claim 1, wherein the image data consists of binary image data, and the processing on this image data is performed by logical operations.