JPH08190602A - Mold number reading method - Google Patents

Abstract

PURPOSE: To accurately read a mold number impressed on the bottom of a bottle. CONSTITUTION: Picked-up image data on the mold number consisting of a binary code formed on an equally divided circumference are divided into smaller pieces and taken in a window on a reader 6. The picked-up image in the window are processed by binarization to be bright point patterns, from which a start bit window is discriminated. The start bit window is used as an index to read only code bits in respective windows and the parity of the code bits is checked. When a parity error is found, the start bit window is shifted, one by one, to the right or left until no parity error is found, and the sign bits are reread.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a model number reading method for reading a binary code model number engraved on a bottle bottom.

[0002] Conventionally, all glass bottles are inspected in an inspection process, and when the number of occurrences of defects in the glass bottles is automatically totaled, the number of defective bottles frequently inspected directly by an inspector when a specific defect frequently occurs is determined. If it is judged that the mold is abnormal, the work efficiency is poor because the mold is manually removed. Therefore, a method has been proposed in which a binary code model number is engraved on the bottom of the bottle and the binary code is read to detect an abnormality in the mold, but a reading device for the model number and a bottle engraved with the model number have been proposed. If the centers of the two do not match or if there is molding distortion in the bottle, there is a problem in that a binary code reading failure or reading error is likely to occur.

[0003]

SUMMARY OF THE INVENTION The present invention provides a model number reading method capable of accurately reading a model number by eliminating a reading failure or a reading error of a binary code of a model number.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In the present invention, imaging data of a model number consisting of binary codes formed on a circle that is equally divided is obtained from the intervals of the binary codes. Is also finely divided and captured in the window of the reading device, the image pickup data in the window is binarized to form a bright spot pattern, the start bit window is identified from the bright spot pattern, and only the code bit on each window is identified. Read, and if the parity check of the sign bit is negative, the start bit window is set to either left or right so that the parity check is positive.
It is characterized in that the code bit is read again by shifting each.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated apparatus. Reference numeral 1 is a holder for a bottle W provided on an inspection line, and the holder 1 is provided with an opening 2 for exposing the bottom of a bottle in which a model number of a binary code is engraved.
Reference numeral 3 denotes an image pickup device provided below the opening 2, and 4 denotes an annular light source for illuminating a bottle bottom, which is provided so as to surround the image pickup device 3, and the annular light source 4 has a large number of LEDs arranged in a ring shape.
A plurality of light emitting elements 5 are arranged concentrically, and each ring-shaped LED light emitting element 5 can be turned on for each column according to the bottle bottom.

Reference numeral 6 denotes a reading device for taking in and identifying the image data taken by the image pickup device 3. The reading device 6 is formed at a position where the circumference of the bottom surface of the bottle is divided into 16 equal parts.
The image data of the binary code is divided into 128 windows 20 and captured, and then binarized to indicate a start bit in which 4 or more bits of 0 are arranged from the array pattern of the bright spot data on each binarized window 20. Select the start bit window. And the start bit, the reference bit,
The parity check is performed after reading only the code bits excluding the parity bit and the like. At this time, if the parity check is negative, the start bit window is shifted to the left or right by one, the code bit is read again, and the parity check is performed again.

FIG. 3 shows a binary code engraved on the bottom of the bottle. A code bit 14 representing the model number, a start bit 9, and a reference bit 1 are shown on a circle virtually divided into 16 equal parts.
0, 11 and parity bit 1 for parity check
2 are formed, and a space between the start bit 9 and the parity bit 12 is a 4-bit “0” code area 13 in which no bit is formed. Since the reference bit appears at least at the 4th bit in the other areas, the start bit 9 can be reliably grasped. The parity bit 12 is added so that the "1" code of the code bit 14 is always an odd number.

In the embodying apparatus, the image pickup device 3 picks up the model number from below the bottle bottom side. However, the image of the model number transmitted through the bottle bottom may be picked up from above the bottle mouth side. Of course.

[0009]

In this structure, the bottle W has the holder 1
When it is transferred onto the upper side, the model number of the binary code is imaged by the imaging device 3 under the illumination of the annular light source 4. The imaged image data of the 16-bit model number that has been imaged is divided into 128 by the window 20 of the reading device 6 and taken in, and then binarized. The intervals of the bright spot patterns of the binarized imaged data on the window 20 are sequentially examined clockwise, and a 4-bit “0” code area 13 and a 3-bit code area 8 between the start bit 9 and the parity bit 12 are checked. To identify the start bit window having the start bit 9.

Then, the bright spot is read from the start bit window and the reference bit 10 appearing at the 4th bit from the start bit 9, the reference bit 11 appearing at the 4th bit from the reference bit 10 and the reference bits 11 through 3 are read. Only the code bit 14 excluding the parity bit 12 appearing at the bit position is read to detect the model number. Then, the parity check of the code bit 14 of the model number is performed to check whether the read model number is correct.

If the bottle W is displaced from the center of the image pickup device 3 or if the parity check fails due to the shift of the bright spot pattern due to the molding distortion of the bottle W, the start bit window is set to 1 on either side. The code bit 14 is read again by shifting each one, and the reading is completed when the parity check becomes positive.

[0012]

As is apparent from the above description, the present invention takes in the image pickup data into the window of the reading device which is divided more finely than the total number of binary code bits of the model number, and thereby the positional deviation between the bottle and the image pickup device is prevented. Since the shift of the bright spot pattern caused by the molding distortion of the bottle is read again by shifting the start bit window by 1 to the left and right, the model number can be accurately read without a reading failure or reading error of the code bit. This is a very large method that contributes to the development of the industry as a model number reading method that solves the above problem.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of an annular light source.

FIG. 3 is a bottom view showing the binary code of the model number engraved on the bottom of the bottle.

[Explanation of symbols]

 6 Reader 9 Start Bit 10 Reference Bit 11 Reference Bit 12 Parity Bit 14 Code Bit 20 Window

Claims (1)

[Claims] 1. Image pickup data of a model number consisting of a binary code formed on a circle that is equally divided is finely divided into smaller intervals than a binary code interval, and is taken into a window of a reading device, and image pickup is performed in the window. The data is binarized to form a bright spot pattern, the start bit window is identified from the bright spot pattern, only the code bit on each window is read, and the parity check of the code bit is performed. For example, the model number reading method is characterized in that the start bit window is shifted to the left or right by one so that the parity check is positive, and the code bit is read again.