JPS6359264A - Image input device - Google Patents

Abstract

PURPOSE:To accurately and rapidly switch and to execute a processing suitable for a character area or a photographing area, by providing a coordinate counter, and a read mode storing memory, and reading out the content of the read mode storing memory by the content of the coordinate counter. CONSTITUTION:The coordinate counter 10 inputs a clock which controls the scan of a photoelectric scanner 1, and a horizontal and a vertical synchronizing signals, and generates the coordinate position of a point on an original being scanned by the photoelectric scanner 1 at present, from those synchronizing signals. In the read mode storing memory 11, a signal logic to be outputted as a control signal 7 is stored corresponding to the position coordinate. In other words, in the read mode storing memory, the logic '0' or '1' of the control signal 7 is set in advance corresponding to the content of the coordinate counter. For example, the logic '0' is written for the bit of the character area 31, and the logic '1' is written for the bit of the photographing area 32. And the above logic is read out by the content of the coordinate counter 10, thereby, a gate circuit is controlled.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides two types of white and black text for character areas in image originals.
The present invention relates to an image input device that converts value data into pseudo gradation data that can represent gradation information for photographic areas.

[Conventional technology]

FIG. 2 is a block diagram showing the conventional configuration of this type of device, in which (1) is a magneto-optical scanner, (2) is a binary data converting circuit, (3) is a pseudo gradation data converting circuit, ( 4) is a character data signal (i.e., black and white binary data signal), (
5) is a photo data signal (i.e. pseudo gradation data signal)
,! 61 is a read mode control circuit, (7) is a control signal,
(8) is an image signal, (9) is an image processing device, (41)
, (51), (71), and (81) are logic gates, respectively.

FIG. 3 is an explanatory diagram showing an image original read by the circuit shown in FIG. 2, where (30) is the original, (31) is the character area, and (32)
) is a photo of Elijah. When reproducing a document from information read from the document (30), binary data (1 bit signal) indicating whether it is white or black is generated for each pixel (1 dot) in the character area (31). It is sufficient to memorize the gradation information for the photo area (32), but it is desired to retain the gradation information for the photo area (32), so it is stored as pseudo gradation data with a predetermined intermediate density between white and black. Remember it. That is, in pseudo gradation data, one pixel must be represented by n bits (where n is an integer of 2 or more). For example, n=2
Then, the shading of the photo area (32) can be expressed in four stages: white (00), gray close to white (01), gray close to black (10), and black (11).

A photoelectric scanner (1) scans an image original (not shown) to be read, converts the intensity of reflected light at a scanning point into an electrical signal, and generates an analog signal. This analog signal is input to the binary data converting circuit (2), where it is converted into a binary signal with 1 sample point and 1 bit.
) and is converted into a digital signal of n bits per sample point.

The reading mode control circuit (6) is controlled by a command issued from a processor or the like depending on whether, for example, a text original or a photographic original is to be read, and sets the logic of the control signal (7) to "0" or "1". ”. When the logic of the control signal (7) is "0", the character data signal (
5) becomes the image signal (8), and when the logic of the control signal (7) is "1", the photo data signal (5) becomes the image signal (8)
becomes.

[Problem that the invention seeks to solve]

In the conventional device as described above, the read mode control circuit (6
) has a complicated structure,
There has been a problem in that it is difficult to quickly and accurately output commands for image originals in which a text area (31) and a photographic area (32) are complicated.

This invention was made in order to solve the above-mentioned problems, and the gate circuit (41) can be accurately and quickly applied even to image originals in which the character area (31) and the photo area (32) are intricately intertwined. ), (51).

The object of the present invention is to obtain an image input device that can control (71) and (81).

[Means for solving problems]

In this invention, a coordinate counter and a reading remote storage memory are provided, and the coordinate counter counts the coordinate position representing which point on the image document is currently being scanned by the photoelectric scanner from the scanning synchronization signal of the photoelectric scanner. The read mode storage memory stores a control signal (7) corresponding to the contents of the coordinate counter.
It was decided to store in advance whether the logic of is set to ``0'' or ``1'', and read out the contents of the read mode storage memory according to the contents of the coordinate counter.

[Effect]

In the present invention, since it is only necessary to read the control signal from the read mode storage memory, accurate and quick control is possible.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention.
In the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts, and since the operations are similar to those in FIG. 2, redundant explanation will be omitted. (10) is a coordinate counter, and (11) is a reading mode storage memory.

The coordinate counter (10) inputs the clock that controls the scanning of the Yuantun scanner (1) and synchronization signals for horizontal synchronization and vertical synchronization (in this specification, these are collectively referred to as synchronization signals), and receives these synchronization signals. The positional coordinates (assumed to be numerical values on the rectangular coordinates of X # y) of the point on the document currently being scanned by the photoelectric scanner +11 are generated from . A control signal (7) is stored in the reading mode storage memory (11) corresponding to this position coordinate.
) is stored as the signal logic to be output. This memory is y□kuykuy2 for a simple manuscript as shown in Figure 3.
And, it may be a simple memory that outputs logic ``1'' if X2 and outputs logic ``0'' otherwise It has a memory of 1 bit per pixel, and writes logic "0" to the bit of the character area (31).
Logic "1" may be written to the bit of the photo area (32). This is read out by the contents of the coordinate counter (lO) and sent to the gate circuits (51), (71),
(41) and (81) are controlled.

〔Effect of the invention〕

As described above, according to the present invention, even for a document in which text areas and photo areas coexist, suitable processes can be accurately and quickly switched and executed for the text areas and photo areas, respectively.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram showing a conventional apparatus, and FIG. 3 is an explanatory diagram showing an example of an image original to be read. (1) is a light coffin scanner, (2) is a binary data conversion circuit, (
3; is a pseudo gradation data conversion circuit, (41), (51)
, (71). (81) is a gate circuit, (10) is a coordinate counter, (11
) is read mode storage memory. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] A photoelectric scanner that scans an image original to be read and converts the intensity of reflected light from each part of the image original into an electrical signal; 2 that converts the output of this photoelectric scanner into a binary digital signal; A value data conversion circuit, a pseudo gradation data conversion circuit that converts the output of the photoelectric scanner so that the reflection intensity of one pixel is represented by an n-bit digital signal (where n is an integer of 2 or more), and control signal logic. a gate circuit that selects the output of the binary data converting circuit when the control signal is "0" and selects the output of the pseudo gradation data converting circuit when the logic of the control signal is "1"; and a gate circuit that is synchronized from the photoelectric scanner. a coordinate counter that inputs a signal and counts the coordinate position scanned by the photoelectric scanner on the image document; a reader that stores the logic of the control signal in correspondence with the coordinate position of the contents of the coordinate counter; A mode storage memory, means for setting the contents of the read mode storage memory, and means for reading the read mode storage memory according to the contents of the coordinate position counter and outputting it as a control signal to the gate circuit. image input device.