JPS62160879A - Scanner interface system - Google Patents

Abstract

PURPOSE:To remarkably reduce the processing time by reading raw data and producing density converted data during a reading of the data. CONSTITUTION:The data read from an image data reading scanner 1 is stored temporarily in a latch 2. A raw data storing address counter 8 and a data storing address counter 10 are set to '0' by a scanner interface controller 3 and the raw data is directly stored in a line buffer 9. The density converted data by a density converting processing circuit 4 is stored in a line buffer 11. Thereafter, the address counters 8, 10 are counted up and store the next data. When this operation is continuously repeated and the scanner 1 completes to read the data of one line, a DMA controller 5 transmits the raw data stored in the line buffer 9 to an external memory.

Description

[Detailed description of the invention] Technical field The present invention relates to a scanner interface method.

In particular, the present invention relates to a scanner interface method that reduces processing time by simultaneously reading raw data and creating density-converted data when reading scanner data.

Prior Art Conventionally, even in an image scanner interface with a relatively slow processing speed, scanner data was sent to an image memory via a line buffer, and then subjected to density conversion processing such as density conversion for display. However, this method has the problem that the scanner interface controller has a lot of free time, which is wasteful.

Purpose The present invention has been made in view of the above-mentioned circumstances, and its purpose is to solve the above-mentioned problems in the conventional scanner interface system, and to realize efficient operation that does not cause idle time in the scanner interface controller. The objective is to provide a scanner interface method that enables

Configuration In order to achieve the above object, the present invention reads raw data at the same time as when reading scanner data.

By generating density-converted data, processing time can be shortened.

Hereinafter, the configuration of the present invention will be explained in more detail based on examples.

FIG. 1 is a functional block diagram showing one embodiment of the present invention. In the figure, 1 is a scanner for reading image data;
2 is a latch for temporarily storing image data read from the scanner 1; 3 is a scanner interface controller; 4 is a density conversion processing circuit; 5 is a DMA controller for sending image data to the system bus 4A;
6 is a DMA address counter; 7 is a selector for selecting raw data and density-converted data; 8 and 9 are address counters and line buffers for storing raw data; 10.
Reference numeral 11 indicates an address counter and a line buffer for storing density-converted data.

The operation of this embodiment will be explained below.

Data read from the image data reading scanner 1 is temporarily stored in the latch 2. The scanner interface controller 3 sets the raw data storage address counter 8 and the density-converted data storage address counter 10 to 0'', and the raw data is stored as is in the line buffer 9. The data density-converted by is stored in the line buffer 11. Thereafter, the address counters 8 and 10 are incremented by 1 and store the primary data.

After repeating this operation and reading one line of data from the scanner 1, the DMA controller 5 gives attention to the system and sends the raw data stored in the line buffer 9 to the external memory. The above raw data is sent out every line, but the line buffer 11
The number of outputs of the data that has undergone density conversion processing and is stored in the data storage area changes depending on the density conversion processing.

For example, when converting data for one line is created only after inputting image data for two lines (200 dpi
to 100dpi), the DMA transfer is 1
It happens every other time. Also, during DMA transfer, the line buffer 9 and the address counters 8 and 10 of the same 11 are
It is controlled by a DMA controller 5 and predetermined addressing is performed. In this way, the raw data and the density-converted data are stored in the external memory as soon as all pages of image data are read, and processing time for density conversion processing is no longer required.

Figure 2 shows the range from 200dpi to 100dpi, that is, 2
When inputting a line and sending out one line of output.

This shows a timing chart.

As shown in Fig. 2, the raw data is output for each line of input data (see ■), but the density-converted data is
Performs 'OR' processing of bits, and when scanning 2 line rows, performs 'OR' processing of adjacent 2 bits and #ORI of the above-processed data of the 1st and 2nd lines.
It is output after performing I processing (see ■).

However, it goes without saying that the method of density conversion is not particularly important in the present invention.

Effects As described above, according to the present invention, when reading scanner data, density-converted data is generated at the same time as raw data is read, so the time for density conversion processing is within the image data input time. This has the remarkable effect of significantly reducing processing time.

The above effect is particularly noticeable when a so-called medium speed type scanner is used as the scanner.

[Brief explanation of drawings]

Fig. 1 is a functional block diagram showing one embodiment of the present invention;
The figure is a timing chart from 200 dpi to 100 dpi, that is, when two lines are input and one line's worth of output is sent out. 1: Scanner for reading image data, 2: Latch, 3
: scanner interface controller, 4: density conversion processing circuit, 4A system bus, 5: DMA controller, 6: DMA address counter, 7: selector for selecting raw data and density-converted data, 8,
9: Address counter and line buffer for storing raw data; 10.11: Address counter and line buffer for storing density-converted data.

Claims (1)

[Claims] (1) An image reading scanner, a scanner interface controller, a line buffer for storing raw data,
In an image information processing system having a DMA controller for data transfer, a density conversion processing circuit and a line buffer for storing density conversion processed data are provided in parallel with the line buffer for storing raw data, and the data is read by the image reading scanner. A scanner interface method that sometimes performs density conversion processing at the same time.