KR20030066486A - Barcode reader using a two-dimension CMOS sensor - Google Patents

Abstract

PURPOSE: A bar code reading system using a two-dimensional CMOS(Complementary Metal-Oxide Semiconductor) photographing element is provided to read a bar code through a bar code video processing algorithm using a photographed video image. CONSTITUTION: An image of an object(10) having a bar code is photographed using a two-dimensional CMOS photographing element(20). The photographed color image is transmitted to a PC(60) through a USB of a PC interface(50) and transmitted to a memory unit simultaneously. The bar code image is received from the memory and transmitted to an image processing unit, and a bar code image processing(40) is executed. After the image processing(40), a result value is transmitted to a PC(60) through a PC interface using a serial port or a USB interface.

Description

Barcode reader system using two-dimensional CMOS image sensor {Barcode reader using a two-dimension CMOS sensor}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barcode reading system using a two-dimensional CMOS imaging device, and more particularly, to a barcode reader for reading a barcode by using a barcode image processing algorithm.

In general, as a current system for recognizing barcodes, a barcode reading system using a CCD sensor and a barcode reading system using a laser sensor are used.

However, the bar code reading system using the CCD sensor has an advantage of low cost, but has a low reading rate and a short lifespan. On the other hand, a bar code reading system using a laser sensor has a high reading rate but an expensive disadvantage.

As such, there is a need for a system that can simultaneously satisfy the high reading rate of the bar code reading system using a laser sensor while replacing the shortcoming of the CCD sensor, which is a shortcoming of the CCD sensor.

In order to solve the problems of the bar code reading system using the CCD sensor and the bar code reading system using the laser sensor as described above, a bar code image is obtained by using a captured image after photographing a bar code image using a two-dimensional CMOS imaging device. It is an object of the present invention to enable reading through a processing algorithm.

In order to achieve the above object, the present invention provides a two-dimensional CMOS sensor unit for photographing an object with a barcode, a memory unit for storing a photographed image, a barcode image processor for processing the photographed image, and a read barcode result. It consists of a PC interface unit that transfers the value to a PC and a computer that the device is connected to.

1 is an illustration of a bar code reading system using a two-dimensional CMOS image pickup device according to the present invention.

2 is a block diagram of a barcode image processing algorithm according to the present invention.

3 is a configuration diagram of a PC interface according to the present invention.

<Description of the code | symbol about the principal part of drawing>

10: object with barcode 20: two-dimensional CMOS imaging device

30: Memory part for storing the image 40: Barcode image processing unit

41: barcode image of the color image 42: gray image conversion unit

43: high frequency filter unit 44: low frequency filter unit

45: barcode area extraction unit 46: adaptive binary wave conversion unit

47: barcode scanning unit 48: barcode reading unit

50: PC interface body

51: interface unit for transmitting to the serial port

52: interface unit for USB transmission

53: USB interface to transfer the captured bar code image

60: computer

Hereinafter, described in detail by the accompanying drawings as follows.

FIG. 1 shows an image of an object 10 having a bar code attached thereto by using a two-dimensional CMOS image pickup device 20, and then the color image captured by the barcode 10 is transferred to the PC 60 through the USB 53 of the PC interface 50. At the same time, the same image is transmitted to the memory unit to store the same image. The barcode image is received from the memory and transmitted to the image processing unit to perform the barcode image processing 40. After reading the barcode after the image processing and output the result value to the PC interface (51) using the serial port to the PC 60 or an example diagram to transmit to the PC 60 through the USB interface 52, FIG. 2 detects only the area of the barcode after passing the high frequency filter 43 and the low frequency filter 44 through the gray conversion unit 42 and the gray image for converting the gray image from the barcode color image image 41 stored in the memory into a gray image. The bar code area detection unit 45 passes through. A bar code image processing configuration diagram for performing adaptive binarization 46 only in the detected area, determining the direction of scanning 47 for barcode reading, and finally reading the barcode.

FIG. 3 is composed of a PC interface unit 51 using a serial port and a PC interface unit 52 using a USB to transmit the barcode result value after the barcode image processing to the PC 60, and is photographed from a two-dimensional CMOS sensor. It is a block diagram of the USB PC interface unit 53 for monitoring the barcode color image on the PC (60).

Looking at the operation of the device to take an image 10 of 30 frames per second using the two-dimensional CMOS image pickup device 20 with the barcode attached. The captured color image image is transmitted from the PC 60 to the PC 60 through the USB interface 53 for monitoring purposes, and simultaneously to the memory unit 30 to store the image image.

The color image image stored in the memory is first passed through the gray converting unit 42 to convert the color image into a black and white image by the image processing unit 40, and each of the high frequency filters 43 to improve the boundary portion of the bar and the inside of the boundary of the bar. ) And the low frequency filter 44.

In order to extract only the region where the barcode exists in the improved barcode image image, the position information of the barcode and the direction of scanning are determined through the barcode region extracting unit 45.

The location information thus determined performs adaptive binarization only in the region in the adaptive binarization part 36. In addition, the directional information of the scanning is used as information for determining the scanning direction in the barcode reading unit 48.

After the barcode area scanning unit 47 passes, the barcode is finally read through the barcode reading unit 48.

The read barcode result value is transmitted to the PC 60 through the PC interface unit 51 using the serial port or transmitted to the PC 60 through the USB interface unit 52 so that the result value can be displayed on the computer monitor. do.

As described above, the present invention is to take a barcode image by using a two-dimensional CMOS imager and to read through a barcode image processing, the price of the entire system is low due to the low price of the two-dimensional CMOS imager It has the advantage of long life.

By providing an accurate reading rate such as a laser reading system, it can be used as an alternative to the existing bar code reading system.

Claims (1)

Applied to a bar code reading system using a two-dimensional CMOS image pickup device, a series of steps of processing a bar code image in FIG. 2, converting a bar code color image into a black and white image, passing through a high frequency filter and a low frequency filter, Extracting only a portion of the barcode area, adaptive binarization in the extracted barcode area, scanning in the extracted barcode area, and finally reading the barcode.