JPH02266483A - Optical character recognizing device - Google Patents

Abstract

PURPOSE:To shorten processing time by disconnecting a density converting means from the 2nd bus at the time of executing the expanding/contracting processing of image data by the density converting means, and disconnecting the 1st bus from the 2nd bus at the time of executing the coding processing of the image data by a coding means. CONSTITUTION:At the time of executing density converting processing, the density converting part 4 is disconnected from an image bus 101 under the control of a bus switch control part 2, and when the coding part 3 executes coding processing, a system bus 100 is disconnected from the image bus 101 under the control of the control part 2. Thereby, the coding processing based upon the coding part 3 and the density converting processing based upon the density converting part 4 can be executed in parallel and the coding processing of the coding part 3 can be rapidly executed. Consequently, the processing speed of image processing can be improved and the processing time can be shortened as a whole.

Description

TECHNICAL FIELD The present invention relates to an optical character recognition device, and more particularly to an optical character recognition device that can perform not only character recognition but also image processing on a form at high speed.

Prior Art Conventionally, in this type of optical character recognition device, the CPU
Since the density converter, encoder, and other l10 (input/output) devices are connected to one bus connected to the CPU (central processing unit), the processing by the CPU is replaced by the processing by the density converter and the encoder. Processing by the conversion department, and! It was selected and executed from among the processes performed by 10 devices.

In such conventional optical character recognition devices, the density converter, the encoder, and other I10 devices exist on the same bus, so the processing by the density converter or the encoder is not executed. The disadvantage is that the bus is monopolized when the process is executed, making it impossible to execute other processes at the same time, and that the overall process takes time.

Purpose of the Invention The present invention was made in order to eliminate the drawbacks of the conventional methods as described above. The purpose is to provide a formula character recognition device.

Structure of the Invention The optical character recognition device according to the present invention includes a storage means for storing image data read by a scanner, a density conversion means for enlarging or reducing the image data, and an encoding means for encoding the image data. a first bus connecting the central processing unit and the encoding means to each other; and a first bus connecting the storage means, the density conversion means, and the encoding means to each other. Second
a bus, a bus control means for controlling connection and disconnection of the first and second buses, and a bus control means for controlling connection and disconnection of the density conversion means and the second bus, the density conversion means When processing by the encoding means is performed, the bus control means separates the density conversion means from the second bus, and when processing by the encoding means is performed, the bus control means separates the first bus from the second bus. The second bus is separated from the second bus.

Embodiment Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In the figure, a CPU 1, a bus switch control section 2, an encoding section 3, and a device 110 are connected to a system bus 100, and an image bus 101 is connected to an encoding section 3, a density conversion section 4, a scanner section 5, and an image bus 101. The buffers 6 are connected to each other. Note that the density converter 4 is connected to the image bus 101 via a bus switch 8.9.

Further, the system bus 100 and the image bus 101 are connected to each other via a bus switch 10.

The form image from the scanner unit 5 is temporarily stored in the image buffer 6, and when performing density conversion processing on the form image stored in the image buffer 6, the form image in the image buffer 6 is transferred to the image bus lO1 and the bus switch 8. It is sent to the density conversion input buffer (IB) (hereinafter referred to as manual buffer) 41 of the density conversion unit 4 via the input buffer (IB) 41 of the density conversion unit 4.

The bus switch 8.9 is set to open only when the CPU accesses the input buffer 41 of the density conversion unit 4 and the density conversion output buffer (OB) (hereinafter referred to as output buffer) 43, respectively. controlled by

In the density conversion unit 4, after the data on the image bus 10i is taken into the input buffer 41 via the bus switch 8, the density conversion process for the data is executed in the density conversion circuit 42 according to a command from the CPUI, and the process is The result is written to output buffer 43.

At this time, since the bus switch 9 is in a closed state, the data held in the output buffer 43 does not flow onto the image bus 101, and the image bus l
ot is never exclusive.

When encoding a form image stored in the image buffer 6 or a form image that has undergone density conversion processing in the density conversion unit 4, the encoding unit 3 converts the data from the image buffer 6 or the density conversion unit 4 into an image. bus lO
After being stored in the human input buffer (IB) (hereinafter referred to as manual buffer) 31 for encoding processing via
Encoding processing is executed on data input via the image bus 101, and the processing results are sent via the system bus 100 to an encoding processing output buffer (OB) (
(hereinafter referred to as output buffer) 33.

At this time, the bus switch 10 is closed under the control of the bus switch control section 2, so the system bus 100 and the image bus 101 are disconnected.

Therefore, the encoding unit 3 can take in the data accumulated in the input buffer 31 via the image bus 101, and at the same time write the encoded data obtained as a processing result to the output buffer 33 via the system bus 100. It is possible to speed up the encoding process.

As mentioned above, since the density conversion process in the density conversion unit 4 can be performed without monopolizing the image bus lot, the encoding process in the encoding unit 3 and the density conversion process in the density conversion unit 4 can be executed in parallel. can.

Furthermore, by separating the system bus I00 and the image bus lot using the bus switch 10, the encoding unit 3 inputs data from the input buffer 31 to the encoding circuit 32 via the image bus 101, and the system bus 100 is Output buffer 3 from encoding circuit 32 via
Since the encoded data can be written in the encoder 3, the encoding process of the encoder 3 can be speeded up.

In this way, when density conversion processing is performed in density conversion section 4, density conversion section 4 and image bus 101 are separated under the control of bus switch control section 2, and when encoding processing is performed in encoding section 3, Bus switch control section 2
System bus 00 and image bus 101 are controlled by
By separating these, the encoding process in the encoder 3 and the density conversion process in the density converter 4 can be performed in parallel, and the encoding process in the encoder 3 can be speeded up. I can do it.

Therefore, the processing speed of image processing, which is a bottleneck in processing time, can be improved and the overall processing time can be shortened.

DETAILED DESCRIPTION OF THE INVENTION According to the present invention, when the image data is enlarged or reduced by the density conversion means, the density conversion means and the second bus are separated, and the image data is processed by the encoding means. By separating the first bus and the second bus when encoding processing is performed,
This has the effect of improving the processing speed of image processing, which is a bottleneck in processing time, and shortening the overall processing time.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. Explanation of symbols of main parts 2... Bus switch control section 3... Encoding section 4... Density conversion section 8 to 10... Bus switch 6. ...Image buffer 31...Manual buffer for encoding processing 32...
...Encoding circuit 33...Output buffer 41 for encoding processing...
... Density conversion input buffer 42 ... Density conversion circuit

Claims (1)

[Claims] (1) An optical character recognition device including a storage means for storing image data read by a scanner, a density conversion means for enlarging or reducing the image data, and an encoding means for encoding the image data. a first bus interconnecting the central processing unit and the encoding means; a second bus interconnecting the storage means, the density conversion means, and the encoding means; Second
bus control means for controlling connection and disconnection of the second bus, and controlling connection and disconnection of the density conversion means and the second bus, the bus control means controlling the bus control when processing by the density conversion means is performed. The density conversion means and the second bus are separated by means, and the first bus and the second bus are separated by the bus control means when processing by the encoding means is performed. An optical character recognition device characterized by: