JPH0522432B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electrically writable programmable ROM (EPROM) writing device, and in particular, to a writing device for an electrically writable programmable ROM (EPROM). EPROM for writing to
Regarding a writing device.

Conventional configurations and their problems Facsimile machines and the like often use array-type image sensors to read originals. This causes uneven output. Therefore, generally, the output unevenness of the array-type image sensor is corrected by multiplying the output Vi of each sensor cell on the array-type image sensor by a correction coefficient Ki. Here, the coefficient Ki is a value that satisfies the following formula.

Vi·Ki=...(1) (V is a constant value, i is the number of the sensor cell) FIG. 1 is a block diagram showing an example of a circuit for correcting such output unevenness.

Reference numeral 1 denotes a multiplier, to which an analog input samples and holds the output signal of the array type image sensor, and an amplified signal is applied as an image signal.
Reference numeral 2 denotes a fixed memory (ROM) that stores data of the coefficient Ki for correcting output unevenness as described above. 3 is an address counter for ROM2,
Driven by a clock synchronized with the image signal. Every time the value of this address counter 3 (corresponding to sensor cell number i of the array type image sensor) changes,
Coefficient data stored at the address specified by the value of the address counter 3 of the ROM 2 is read out and supplied to the digital input of the multiplier 1. Multiplier 1 combines the image signal given to the analog input with
Multiplication is performed with the coefficient data from the ROM 2, and a level-corrected image signal is output.

Now, the coefficient data to be stored in the ROM2 needs to be determined according to the characteristics of each array type image sensor and the characteristics of the individual optical system in which it is used.
Programmable ROM (PROM) such as EPROM is generally used. However, in the past, there was no dedicated device for writing coefficient data into EPROM, etc. used as ROM2, and a method was used in which a general-purpose PROM writing device was used to write separately determined coefficient data into EPROM, etc. It was not possible to create it efficiently and in a short time. In addition, it is necessary to store the coefficient data determined in advance in a memory circuit, etc., and to use an intermediary device to input the coefficient data as is or after converting it into a paper tape or the like to the EPROM writing device, which requires large-scale equipment. There were also some problems.

OBJECTS OF THE INVENTION An object of the present invention is to provide a dedicated EPROM writing device for efficiently creating a ROM for correcting output unevenness of an array type image sensor in a short time.

Configuration of the Invention The EPROM writing device according to the present invention is configured to efficiently perform the steps from generation of coefficient data for correcting output unevenness of an array type image sensor to writing of the coefficient data to the EPROM within the device.

That is, in the EPROM writing device according to the present invention, coefficient data for correcting output unevenness of the array type image sensor is sequentially generated by the data generation means that receives the output signal of the array type image sensor.
This coefficient data is sequentially written into a storage means such as a random access memory (RAM) under the control of the control means in synchronization with a clock synchronized with the output signal. At this time, the write address is designated by a counting means that counts the clocks. After completion of such a write operation of coefficient data, or in parallel with the write operation, the coefficient data is sequentially read from the storage means and transferred to the write means under the control of the control means. is written to EPROM by Address designation at this time is performed by the control means.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic block diagram showing the overall configuration of an EPROM writing device according to an embodiment of the present invention. In the figure, 11 is an arithmetic storage circuit;
This is the part that generates and stores coefficient data. 12
is the coefficient data transferred from the arithmetic storage circuit 11.
This is a write circuit that writes to the EPROM 13. 14
is a control section that controls the operation of the entire device, and for example, a microprocessor is used. This control section 14, arithmetic storage circuit 11, and writing circuit 12
are interconnected by a common bus 15 (consisting of a data bus, an address bus, and a control bus). An output signal from an array type image sensor (not shown) is sampled and held in a sample and hold circuit (not shown), then amplified by an amplifier (not shown), and input to the arithmetic storage circuit 11 as an image signal. Further, a clock synchronized with this image signal is also input to the arithmetic and storage circuit 11.

FIG. 3 is a detailed block diagram of the arithmetic and storage circuit 11. In the figure, numeral 16 is an analog/digital (A/D) converter that converts the image signal into digital data in synchronization with a clock. The output data of this A/D converter 16 is input to the ROM 17 as an address signal. In the ROM 17, data of a coefficient Ki satisfying the above-mentioned equation (1) is stored in advance at address Vi. Therefore, coefficient data corresponding to the level of the direct signal is output from the ROM 17. That is, the A/D converter 16 and the ROM 17 constitute coefficient data generation means.

18 is a random access memory (RAM). A data input/output terminal of the RAM 18 is selectively connected to an output terminal of the ROM 17 or a data bus 15a in the common bus 15 through a switch circuit 19. Also, the address terminal of RAM18 is
It is selectively connected via a switch circuit 20 to an output terminal of an address counter 21 for counting clocks or to an address bus 15b in the common bus 15. switching control of the switch circuits 19 and 20;
Mode control of RAM18 read/write signals,
And the reset control of the address counter 21 is as follows.
Both are performed by the control unit 14 via the control bus 15c in the common bus 15.

Next, the operation of this EPROM writing device will be explained.

First, the control unit 14 connects the switch circuit 19 to the ROM 17 side through the control bus 15c, and connects the switch circuit 2 to the ROM 17 side.
0 to the address counter 21 side, reset the address counter 21, and
A write mode read/write signal is supplied to 18. In this state, when an image signal and a clock are supplied from the array type image sensor side, coefficient data is output from the ROM 17 in synchronization with the clock, and the coefficient data is sent to the RAM 18 through the switch circuit 19.
is input. Further, the address counter 21 is counted up by the clock, and its output is inputted to the RAM 18 through the switch circuit 20. Therefore, coefficient data is sequentially written to consecutive addresses in the RAM 18.

When coefficient data for all sensor cells of the array type image sensor is stored in the RAM 18, the control unit 1
4 is connected to the switch circuit 19 through the control bus 15c.
20 to the data bus 15a and address bus 15b, respectively, supplies a read/write signal for the read mode to the RAM 18, and activates the write circuit 12. And the control unit 14
An address signal is placed on the address bus 15b. This address signal is passed through the switch circuit 20.
Coefficient data is input to the RAM 18 and read from the address on the RAM 18 specified by the same address signal, and the coefficient data is transferred to the data bus 15a through the switch circuit 19. Immediately after this, a write timing signal is output from the control section 14 to the control bus 15c. When this write timing signal is output, the write circuit 12 starts a write operation specified by the address signal on the address bus 15b.
Data bus 1 is sent to a specific address on EPROM13.
Write the coefficient data on 5a. When this write operation is completed, the control unit 14 transfers the address bus 15b to
The above address signals are updated to perform similar read and write operations. By repeating such operations, the coefficient data stored in each address of the RAM 18 is copied to the EPROM 13.

EPROM13 that has been copied in this way
can be used as is as ROM2 in FIG.

Note that, depending on the balance between the writing speed of the EPROM 13 and the input speed of the image signal, the coefficient data can be written from the RAM 18 in parallel with the writing operation of the coefficient data to the RAM 18.
It is also possible to perform a copy operation of coefficient data to the EPROM 13. In this case, the read/write signal mode of the RAM 18, the switch circuit 19,
20 connections are switched in a time-division manner on the control unit 14 side.

Further, the switch circuits 19 and 20 may be replaced with mechanical switches, and the switches may be operated manually. However, in such a configuration, it is impossible to execute a copy operation to the EPROM 13 in parallel with writing coefficient data to the RAM 18.

Effects of the Invention As described above, the EPROM writing device according to the present invention includes means for generating coefficient data based on an output signal (image signal) of an array type image sensor;
storage means for accumulating coefficient data; counting means for counting clock signals synchronized with the output signal to create a writing address signal for the storage means;
A writing device for writing to an EPROM, a control device for controlling reading and writing operations of the storage device, controlling a writing operation of the writing device, and specifying a read address of the storage device and a write address of the EPROM. Therefore, stored correction coefficient data can be copied to EPROM, and EPROM used for correcting output unevenness of array type image sensors can be efficiently created in a much shorter time than before. I can do it. Furthermore, the EPROM writing device of the present invention can create an EPROM for correcting uneven output of an array type image sensor by itself without using any other devices, simplifying the manufacturing process of facsimile devices, etc., and reducing the scale of manufacturing equipment. It also has the effect of being able to be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a circuit for correcting output unevenness of an array type image sensor, FIG. 2 is a schematic block diagram of an EPROM writing device according to an embodiment of the present invention, and FIG. FIG. 3 is a detailed block diagram of the circuit. 11...Arithmetic storage circuit, 12...Writing circuit,
13... EPROM, 14... Control unit, 15... Common bus, 15a... Data bus, 15b... Address bus, 15c... Control bus, 16... Analog/digital converter, 17... ROM, 18 …
...RAM, 19,20...Switch circuit, 21...
...address counter.

Claims (1)

[Claims] 1. Data generation means for generating coefficient data for correcting the output of the image sensor by inputting the output signal of the array type image sensor, a counting means for counting clocks synchronized with the output signal of the image sensor, and the data a storage means for storing the coefficient data generated by the generation means; a switching means for selectively switching the reading/writing of the coefficient data and the transfer destination of addressing information for the storage means; and a writing means for writing the coefficient data into the EPROM. means, a control means for controlling writing and reading of coefficient data to and from the storage means and controlling writing of coefficient data to an EPROM by the writing means; and a control means commonly connected to the control means, the storage means, and the writing means. and under the control of the control means, the coefficient data generated by the data generation means is sequentially written into the storage means at an address indicated by the count value of the counting means in synchronization with the clock. After the write operation is completed or in parallel with the write operation, the coefficient data at the address specified by the control means is sequentially read from the storage means and transferred to the write means via the bus, and the coefficient data thus transferred is read out from the storage means and transferred to the write means via the bus. The writing means sequentially writes data to addresses specified by the control means of the EPROM.
EPROM writing device.