JP2725093B2 - Model number reading method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

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

[0003]

DISCLOSURE OF THE INVENTION The present invention relates to a method in which
An object of the present invention is to provide a model number reading method capable of accurately reading a model number by eliminating a reading error or a reading error of a model number of a binary code .

[0004]

Means for Solving the Problems] The present invention has been made in order to solve the aforementioned problem, an imaging taken by the imaging device
Divide the data into multiple parts and import them as test pixels,
It is a code bit that is engraved in a circle at the bottom and is binary encoded.
A model number reading method for reading a certain model number ,
Setting a circular inspection pixel on the image obtained by capturing the model number; and binarizing the inspection pixel into a bright spot pattern, starting with a sequence of dark spots and bright spots based on the bright spot pattern. Identifying a pixel, and a binary mark engraved on the bottom of the bottle
Start bit and reference bit
And the parity check is performed by reading only the code bits excluding the parity bit , and if the parity check is not performed, the reference point of the start pixel is rotated left or right on the circle so that the parity check becomes positive. And re-reading the code bit by shifting one pixel at a time.

[0005]

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

Reference numeral 6 designates a reading device for reading and identifying the image data picked up by the image pick-up device 3. The reading device 6 is formed at a position obtained by dividing the circumference of the bottom of the bottle into 16 equal parts.
Coded image data is divided into 128 windows 20, fetched as test pixels, binarized, and a start bit in which 0 or more 4 bits are arranged from the array pattern of bright spot data on each binarized window 20 Is selected as a start bit window to be a start pixel. Then, the parity check is performed after reading only the code bits excluding the start bit, the reference bit, the parity bit, and the like. At this time, if the parity check is not possible, the start bit window, which is the start pixel, is shifted one by one to the left or right on the circle, the code bit is read again, and the parity check is performed again. Things.

FIG. 3 shows a binary code engraved on the bottle bottom.
Indicates the Tsu bets, the sign bit 14 representing the model number on the circumference which is virtually divided 16, etc., a start bit 9, the reference bit 10, 11, to form a parity bit 12 for a parity check The space between the start bit 9 and the parity bit 12 is a 4-bit “0” code area 13 in which no bit is engraved. Since the reference bit appears at least as the fourth bit in other areas, the start bit 9 can be grasped without fail.
The parity bit 12 is added so that the number of “1” codes of the code bit 14 is always an odd number.

In the embodiment, the image pickup device 3 picks up the model number from below the bottle bottom, but may pick up the image of the model passing through the bottle bottom from above the bottle mouth. Of course.

[0009]

With the above-described structure, the bottle W is mounted on the holding table 1.
When it is moved upward, the model number of the binary code is imaged by the imaging device 3 under the illumination of the annular light source 4. The captured image data of the 16-bit model number is divided into 128 by the window 20 of the reading device 6, captured as inspection pixels, and binarized. The interval between the bright spot patterns of the binarized imaging data on the window 20 is sequentially checked clockwise, and the 4-bit “0” code area 13 and the 3-bit code area 8 between the start bit 9 and the parity bit 12 are checked. And a start bit window serving as a start pixel having the start bit 9 is determined.

Then, a bright point is read from the start bit window, and a reference bit 10 appearing at the fourth bit from the start bit 9, a reference bit 11 appearing at the fourth bit from the reference bit 10, and a reference bit 11 appearing at the fourth bit. 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 the parity check is rejected due to the displacement of the luminescent spot pattern due to the molding distortion of the bottle W, the start bit window, which is the start pixel, is circled. After shifting upward one by one to either the left rotation or the right rotation, the code bit 14 is read again, and when the parity check becomes positive, the reading is completed.

[0012]

As is clear from the above description, the present invention sets a circular inspection pixel on an image obtained by imaging a model number, and binarizes the inspection pixel to form a bright spot pattern. By identifying the start pixel from the arrangement of dark spots and bright spots from the bright spot pattern, the shift of the bright spot pattern caused by the positional shift between the bottle and the imaging device or the bottle distortion due to the forming distortion of the bottle is determined by the start bit window which is the start pixel. Is shifted one by one to the left or right on the circle and read again, so that the model number can be read accurately without code bit reading errors or reading errors. This method is extremely large in that it contributes to the development of the industry as a model number reading method.

[Brief description of the 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 a binary code of a 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 Sign bit 20 Window

Claims (1)

(57) [Claims] 1. An image pickup apparatus according to claim 1, further comprising:
Divided into multiple pieces and taken in as inspection pixels, circular on the bottom of the bottle
Is a code bit that is engraved and binary encoded
A method for reading a model number, a step of setting a circular inspection pixel on an image obtained by imaging the model number,
A process of binarizing the inspection pixel into a bright spot pattern, identifying a start pixel from a sequence of dark spots and bright spots based on the bright spot pattern, and a code being a binary code engraved on the bottom of the bottle;
Start bit, reference bit, parity
The parity check is performed by reading only the code bits excluding the bits and the like.If the parity check is not performed, the reference point of the start pixel is rotated leftward or rightward on a circle so that the parity check is positive. A method of reading a model number, comprising a step of re-reading a code bit by shifting one pixel at a time.