JPS63231393A - Image display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention edits high-resolution image data input by an image input means such as an image scanner on the screen of an image display device, and inputs the edited image. The present invention relates to an image display device used in an electronic editing system that outputs an image using an image output means such as a printing machine at the same resolution as when the image was originally created.

[Conventional technology]

Image input means such as image scanners and image output means such as laser printers used in this type of electronic editing system have been developed with considerably high resolution. On the other hand, CRT
Display devices such as displays are low compared to these, and when inputting an image using a high-resolution input means and compositing it with a graphic screen generated by a host computer on the display screen, it is necessary to adjust the resolution in advance to match the resolution of the display. When inputting or outputting high-resolution printed matter, input and store the high-resolution image into the host computer, and transfer the thinned-out image to the display frame. On the other hand, a method is used in which graphic data generated by a computer is transferred to another frame on the display, and the frame images are superimposed on the display side and displayed as a composite image. Also, when compositing the input image by enlarging, reducing, rotating, etc., perform the above processing on the image of the thinned out frame screen and convert the final image into R.
After t=, a similar process is applied to the high-resolution image to obtain a high-resolution printed matter.

[Problems with conventional technology]

When obtaining high-resolution printed matter, it is necessary to hold the input image on the host device side, and also create and hold the image data of the thinned screen in order to transfer it to the display, which places a large burden on the host device side. was on. Also, when performing editing processing that changes the contents of an image, such as enlarging or reducing, the high-resolution input image is directly processed and the thinned out image data is processed to update the screen. There was a problem when high-definition printed matter was required, as there was a discrepancy in the image when it was displayed.

[Problems solved by the invention]

This invention was made to solve these problems, and aims to reduce the load on the host device side and to obtain printed matter equivalent to the image confirmed during editing work.

[Means for solving problems]

Bit map memory pages for storing image data input from an external device (host CPU, etc.) and outputting it to an output device such as a printer at the same resolution, and the image data stored in the bit map memory. A first frame memory configured to thin out images according to external commands and display them on the screen, or to be able to be input/output to/from an external device, and to store arbitrary images input from the external device and display them independently. Or, it has a second frame memory configured so that it can be displayed overlappingly with the first frame memory, and the bit map memory for high-resolution output or the first and second frame memories can be specified externally and selectively displayed. The above-mentioned problems can be solved by providing means for inputting and outputting image data.

〔Example〕

An embodiment will be described below with reference to the drawings. FIG. 1 shows a block diagram of an image display device according to the present invention. In FIG. 1, 10 is a central processing unit (
14 is an interface for exchanging control information, synchronization signals, and image data with an external device; 18 is a large-capacity memory for storing high-resolution image data from the external device; 24a and 24b are displays for one screen. The first and second frame memories 31 for storing data select either frame 1 or frame 2 for inputting image data from an external device and lead them to the frame memory, and when displaying the contents of the frame memory, A logic gate for logically ORing the contents of either one or both of them and guiding the result to the CRTC 26. The logic gate 26 performs a focusing operation in synchronization with the scanning timing of the CRT.
A CRT controller that reads the contents of map memory or frame memory 1.2 at high speed, hereinafter referred to as CRTC, 2
8 is a P/S converter that converts the data read by the CRTC 26 into serial data and sends it to the CRT 30;
22 is a thinning circuit that thins out the contents of the bitmap memory 18 and leads it to the frame memory 1.2 in order to display one page;
20 is bit map memory 18, frame memo January,
2.24a This is a memory controller that generates write and read timings for 224b.

Next, the operation of editing an image input by an image input means such as an image scanner and composing it with graphic data generated by an external device such as a host computer will be described. FIG. 2 shows the procedure for transmitting and receiving data between an external device and an image display device. Prior to transmitting and receiving image data, a control information line (RS232
Preparation for transfer is made via ENQ and ACK→READY via C). After preparation is complete, transfer the pixel data,
After transferring the last pixel, send PAC;E END to end image transfer.

The transmission format for image transmission and reception is STX, as shown in Figure 3.
It is designed to sandwich commands with ETX, and READS
Select WRITE, select target memory, and set write area and read area. When writing to bit map memory, image data is written to bit map memory 1 in DMA mode.
8, or in the case of writing to the frame memory, the high-resolution image read by the 0-order image input means and the graphic image generated by the external device are written to the frame memory l or 2.24a, 24b. A case in which editing is performed on the superimposed screens and output as a high-resolution image will be explained based on FIGS. 1 and 4. In Figure 4, “
Input the characters "large" into the bitmap memory as a high-resolution image using an external image input means or external device. The thinned out image is processed and transferred to the frame memory 1.24a (port).

Conventionally, this thinned screen is enlarged, so unevenness is displayed as shown in (c), and the graphic image input from an external device (
When combined with (d), the result is as shown in (e), which is different from the image obtained when the image data in the focus map memory is directly enlarged. In this embodiment, an enlarged image is obtained by an image processing processor built in the image display device (not shown) or an external device, and the thinned image is transferred to the frame memory 1.24a by the thinning circuit 22, as shown in (f). , and the frame memory 2.24b in which the graphic image is stored is displayed in an overlapping manner. In this case, since the enlarged image of the original image is thinned out and displayed, it is possible to view the image (h) which almost matches the final printed image. Graphic image information is usually held as vector data, and an image processing processor (not shown) generates a print image based on the vector data on a bit map memory. is specified and transferred to obtain a print image on the bit map memory. Since a graphic image is generated based on vector data, there is no difference between the image on the screen and the printed image obtained by enlarging the image. The print image obtained on the bit map memory is output to an external device via the I/F 14 in response to the READ command shown in FIG.

〔Effect of the invention〕

As explained above, when a graphic image that can be generated by a program in an external device or an image that has been input by an image input means and stored in a frame memory is displayed on the screen by performing processing such as [movement] without changing the content. transmits and receives image data directly between an external device and the frame memory, and photographs, illustrations, etc. input by the image input means are first stored at high resolution in the bit map memory, thinned out, and transferred to the frame memory. Store in. Or, when performing processing such as "enlargement" that changes the contents of the image stored in the frame memory, the image in the bitmap memory is enlarged, thinned out, and stored in the frame memory again to create a print image. In addition to being able to confirm the matched image on the screen, for processing that does not change the graphic image or image content, it can be transferred directly to the frame memory in a short time without going through the bitmap memory, so there is no need to use an external device for the transfer. Since it is not used exclusively for a long time, the burden on the external device can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the image display device according to the present invention, FIG. 2 is an explanatory diagram showing the procedure for transmitting and receiving image data between an external device and the image display device, and FIG. 3 is a diagram showing the data structure of commands. FIG. 4 is an explanatory diagram when a high-resolution image input by an image input means or the like is enlarged, combined with a graphic image, and displayed on a screen. 10... CPU 12... Pass line 14... I/F 16... DMAC 18... Bit map memory 20... Memory controller 22... Thinning circuit 24a... First Frame memory 24b...Second frame memory 26...CRTC 28...P/S converter 30...CRT display

Claims (1)

[Claims] 1) A bit map type image display device that displays image data input from an external device that expresses pixel density in binary values. A bit map memory for outputting to an output device, the image data stored in the bit map memory is thinned out automatically or according to a command from an external device, and one page is displayed on the screen, or the display contents are transferred to an external device. a first frame memory configured to allow input/output between the two; and a second frame memory configured to store any image input from an external device and display it alone or overlay with the first frame memory. frame memory, and a means for selectively inputting and outputting image data by externally specifying a bit map memory for high-resolution output or the first and second frame memories. Image display device.