JPS58125186A - Optical character reader - Google Patents

Abstract

PURPOSE:To execute read with a high recognition rate, by providing a button for selecting a threshold level which decides an input video signal obtained by scanning, as black and white. CONSTITUTION:A character, etc. entered into a business form by a photoelectric converting device 1 are scanned, a reflected ray obtained by scanning is converted to an electric analog signal by the photoelectric converting device 1 therough a lens 3, it is inputted to a binary-coding circuit 5 through an amplifier 4, and is converted to a digital signal corresponding to a white level and a black level. On this binary-coding circuit 5, a button for selecting a threshold level which decides an input analog signal as balck and white is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to an optical character reading (OCR) device, and in particular, in selecting a threshold level for determining an input video signal as black and white, 〇(b) Related to an optical character reading device that selects and reads a more appropriate level Conventional technology and problems Conventionally, in an OCR device as shown in Fig. The characters etc. written on the form 2 are scanned in the horizontal direction with respect to the form traveling direction A, and the reflected light obtained by this scanning is sent to the image sensor 1 via the lens 3 to detect stains. After converting it into a digital signal and amplifying it through an amplifier 4, the automatic binarization circuit 5 compares it with the standard signal of a certain day and converts it into a digital signal with contrast to the white level and black level. sending.

A general KOCR device is installed at a specific location, and documents created at various locations are concentrated and read at once by a dedicated person. Forms are rounded off by a large number of people, and there are variations in the density of characters written on forms, which lowers the reading rate of OCR devices. Therefore, in order to ensure readability, students were taught to write characters that were easy for machines to read, but this was a difficult task. In addition, machines were required to accurately read both dark and light characters, making them expensive.

Nowadays, in order to speed up data processing, OCR
There is a trend toward distributed processing in which devices are distributed and data is processed at the location where it is generated.

Therefore, it is desired to reduce the price of the machine.

(c) Purpose of the Invention The purpose of the present invention is to provide a large number of binarization threshold levels for video signals when reading characters written on a form, and to enable the operator to select an appropriate level from the character recognition level. It is an object of the present invention to provide an inexpensive OCR mount.

(d) Structure of the invention and the object of the present invention is to write characters written on a form,
An optical character aS device that reads a symbol by optically scanning the symbol, characterized in that an input video signal obtained by the scanning is provided with a button for selecting a @hanashi bell that determines the input video signal to be black and white. This is achieved by using a device.

(e) Examples of the invention The present invention will be explained below using examples.

Since the processing by the OCR device is performed in a distributed manner, it is often processed in one place. Further, when reading dark or light characters with an OCR device, the threshold value for determining the input video signal as black and white and its recognition rate have a relationship as shown in FIG. Therefore,
Since the person filling out the form can immediately determine whether the characters, etc. written on the form are written darkly or lightly, the machine can automatically fill in the form using an automatic binarization circuit as in the past. Without determining the threshold value based on the shading of the characters, a system that selects the optimal threshold value can be put into practical use. To explain Figure 2 in detail, the darkly written character 6 is written with a lead line, so it is cut above the 1st control value to prevent noise from surrounding the character, which contaminates and roars around the character. The recognition rate is better if black and white are separated. Since the nine characters 7 are written thinly and rarely stain the surroundings of the characters, the recognition rate is good even if the characters are not cut too far above the threshold.

Utilizing the above content, the OCR device has multiple buttons for selecting the threshold level that determines the input video signal to be black and white,
The structure is such that each button can store examples of character shading.
7 is the present invention.

The operation of the OCR device is carried out using a button (switch), and if that button is used as the selection button above, for example, as shown in Figure 3, 3 buttons with 1
Display the character and set the darkness #'a of that character to the character density example at the threshold level, or create a part near it where the character density example above can be inserted, and insert the character density example in it. Display it.

When writing characters on a form, there are differences in the level of pen pressure depending on the person filling in the form, resulting in shading in the written characters. When submitting the form to the OCR device, a button is pressed to select the threshold level that determines the input video number 8 to be incandescent. At that time, the displayed character shading sample and the operator (
Adopter's Knowledge 1: Compare the text with your own and press the button corresponding to the density, without the need for the conventional automatic binarization circuit 5.
Anyone can make accurate selections and read with a high recognition rate.

(f) Effects of the Invention As described above in detail, the optical character reading device of the present invention has a large number of binarization threshold levels for video signals, and allows the operator to select an appropriate level from the character density level to operate the reading system. By doing so, the conventional automatic binarization circuit is not required, so the cost is reduced, and the recognition rate is greatly improved in the number of seconds required.

[Brief explanation of drawings]

Figure 1 is a schematic diagram for explaining a conventional OCR device, Figure 2 is a diagram of the relationship between the recognition rate of dark characters and light characters and the threshold value,
FIG. 3 shows one of the selection buttons containing an example of character density according to the present invention.
It is a front view showing an example. In the figure, 6 indicates a character written in a dark color, and 7 indicates a character written in a light color. )

Claims (1)

[Claims] 1. In an optical character reading device that optically scans and reads characters and symbols written on a form, a threshold level for determining that the input video signal obtained by the scanning is black and white. An optical character reading device characterized by having a button for selecting. 2. The above button, 9 is a patent characterized in that a character density example can be stored near the above button.