JPS6085681A - Picture information processing system - Google Patents

Abstract

PURPOSE:To obtain a reproducing picture with high picture quality by providing the 1st selection means which selects one threshold level processing means and the 2nd selection means which selects one expansion or shrinkage processing means corresponding to the threshold level processing means selected by the selection means. CONSTITUTION:When a microprocessor unit MPU detects an interruption signal from a picture read device R, the unit reads command data of the command register at a picture read device interface circuit RIF at an S1. The command data includes the command information concenrning the fact whether or not picture data sent from the picture read device are the picture data of the photo picture or picture data of the character picture. Next, at an S3, control data for controlling a circuit BMP is set to the register. With respect to the processing for the character picture or the processing for the photographic picture when expansion or shrinkage is processed, the arithmetic processing system of the BMP circuit is switched in accordance with the command data read out from the RIF circuit, and starts the BMP circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image information processing system for processing image information.

[Prior art]

In recent years, with the rapid development of image information processing systems centered on electronic computers, the need for high-speed processing of image information, such as data processing or word processing, is increasing. With this, image reading devices, etc. In many cases, image information is taken in from an input device, processed by an arithmetic processing device, and then sent to an output device such as a laser beam printer to obtain recorded information.

By the way, if the image read by the image reading device is a photographic image or a text image, the image information is processed in different ways. performs single threshold processing (binarization processing). Furthermore, when enlarging or reducing image information read from the image reading device, it is necessary to use different methods after dither processing and after binarization processing. 1st
The figure shows an example of a reduction method after binarization processing, and is vertical.

In the case where the image is reduced to 1/2 in each horizontal direction, one dot on the upper left of four dots configured in 2×2 is sampled. Figure 2 shows an example of a reduction method after dither processing, in which the reduction is reduced to 1/2 in both the vertical and horizontal directions.
One matrix at the upper left of four matrices (each composed of 4×4 dots) composed of X2 is sampled.

However, when the photographic image read by the image reading device is dithered and then reduced for the binarization process shown in FIG. Depending on the value, low density levels may be emphasized or high density levels may be emphasized, and halftones cannot be reproduced satisfactorily. On the other hand, when the character image read by the image reading device is subjected to single threshold processing and then reduced for dither processing as shown in FIG. may not be reproduced, or there may be some force (discontinuous pressure) on the edges of the letters.

〔the purpose〕

Therefore, in view of the above-mentioned points, the present invention provides an image information processing system that performs appropriate enlargement or reduction processing on image information read by an image reading device depending on the nature of the image, and obtains a high-quality reproduced image. The purpose is to provide the following. That is, a plurality of threshold processing means, a plurality of enlargement or reduction processing means, a first selection means for selecting one of the threshold processing means, and a threshold processing selected by the selection means. The apparatus is characterized in that it has a second selection means for selecting one of the enlargement or reduction processing means corresponding to the enlargement or reduction processing means.

〔Example〕

The present invention will be explained below based on the drawings.

FIG. 3 is a system block diagram of one embodiment according to the present invention. ■ is an image reading device, R engineering F is arithmetic processing system A
MM is the main memory, DMAC is the direct memory access control circuit, MPU is the microprocessor unit, CRT is the cathode ray tube, 0RTO is the CRT control circuit, and BMP is the image reading device interface circuit. , a part of the CRT control circuit described above enlarges or reduces the image data and converts it to a CR.
This is an arithmetic circuit for writing to the display memory of the T control circuit.

FIG. 4 is a flowchart showing an example of the operation of the block diagram of FIG. First, when the microprocessor unit (MPU in FIG. 1) detects an interrupt signal from the image reading device R, the microprocessor unit (MPU) in FIG.
Read the command data in the IF command register.

This command data includes command information indicating whether the image data sent from the image reading device is a photographic image or a character image. In S2, control data for controlling the direct memory access control circuit DMAC:[, direct memory access control circuit DMAC:
Activates access burst transfer. Next, in 86, control data for controlling the circuit BMP is set in a register, and when enlarging or reducing processing, whether processing is for character images or photographic images is read from the RIF circuit. The Bhl
The arithmetic processing system of the p circuit is switched and this BMP circuit is activated. In S4, control data for controlling the interface circuit RIF is set in a register and activated. Next, in S5, the task is transferred from the microprocessor unit MPU to the DMAC, BMP, and RIF circuits, and the RIF circuit reads the document of a predetermined size sent from the image reading device R at a predetermined resolution. At oS6, the image data written to the backup memory of the RIF circuit is output onto the data BUS.

Next, in S7, the image data sent onto the data BUS is written into the main memory MM under the control of the DMAC circuit, and at the same time, the image data on the data BUS is written into the BMP circuit of the 0RTO circuit. The image data is captured and processed by the enlargement or reduction processing circuit in the BMP circuit, and the processed image data is written to the CRT display memory in the 0RTO circuit. Incidentally, the BMP circuit is, for example, B
The image is reduced by thinning out the lines of image data on the US or by thinning out the pixels within the lines.

Next, the above s5. s6. The operation of s7 is repeated while image data is sent out from the image reading device R.

FIG. 5 shows steps S6 and S7 in the flowchart of FIG.
A flowchart of a detailed operation example is shown.

The RIF circuit writes the image data sent from the image reading device R into the buffer memory, and then sends out the REQ signal. On the other hand, the DMAC circuit is in an activated state,
It is in a wait state until the REQ signal is detected. When the DMAC circuit detects the REQ signal sent from the RIF circuit, it sends out the RAGK signal.

On the other hand, the RIF circuit maintains a wait state after sending the REQ signal until the RACK signal is detected.

The RIF circuit receives the RAC signal sent from the DMAC circuit.
When the K signal is detected, the data in the buffer memory of the FtIF circuit is sent onto the data BUS, and the data strobe signal DS is asserted. On the other hand, the DMAC circuit
It is in a wait state until a signal is detected, and when a DS signal is detected, the data on the data BUS is transferred to the main memory M.
At the same time as writing to M, the data access signal DTAC
0 which sends out K, then the data transfer counter T,
Decrement the counter of C, and if T and C are not 0, return to the initial state, and if T and C are O,
The above task is ended by outputting an END signal.

Further, the BMP circuit receives D output from the RIF circuit.
The data BU is in a wait state until the S signal is detected, and when the DS signal is detected, the data BU is sent from the FtIF circuit.
Write the data on S to the input buffer of the BMP circuit. This image data written to the input buffer is enlarged or reduced by selecting an enlargement or reduction circuit and a magnification ratio for photographic image processing or text image processing by a control signal written in advance to the control register of the BMP circuit. It is converted to image data and written to the output buffer of the BMP circuit.

This processed image data written to the output buffer of the BMP circuit is written to a predetermined address of the CRT display memory of the circuit GRTC based on the address data generated by the BMP circuit, and the processed image data is displayed on the CRT screen. The 0RIF circuit and BMP circuit to be used are DMAC
Each of the above operations is repeated until the END signal "" is detected.

Therefore, the image data read by the image reading device is written into the MMK of the arithmetic processing system, and at the same time the processed image data obtained by processing the original image is displayed on the CRT screen.

〔effect〕

As explained above, according to the present invention, appropriate enlargement or reduction processing is performed for the selected threshold processing, so that it is possible to obtain an excellent reproduced image.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a method for reducing image information subjected to binarization processing, FIG. 2 is a diagram showing a method for reducing image information subjected to dither processing, and FIG. 3 is a system block diagram of an embodiment of the present invention. ,
FIG. 4 is a flowchart of the operation, and FIG. 5 is a detailed flowchart of FIG. R... Image reading device (image information generation device) A...
... Arithmetic processing system RIF ... Image reading device interface circuit,
l M...◆...Main memory (first storage means) DMA
C,,,,・Direct memory access control circuit MPU-〇〇fist・Micro 7't-cessor unit C
RT...Cathode ray tube 0RTO-〇・■Same as above CRT control circuit BMP・
...Enlargement/reduction calculation circuit BUS...Data bus 1 ■ L -, -J

Claims (1)

[Claims] a plurality of threshold processing means, a plurality of enlargement or reduction processing means, and a first one for selecting one of the threshold processing means;
selection means; and one of the enlargement or reduction processing means corresponding to the threshold processing means selected by the selection means.
Image information processing system 0 characterized in that it has a second selection means for selecting one.