JP7200333B2 - Code conversion method - Google Patents

Description

The present invention relates to a code conversion method.

2. Description of the Related Art When purchasing new clothes or resizing clothes in a clothing store, it is common for a store clerk to measure dimensions using a tape measure. The store clerk manually enters the measurement data into the size chart for each customer, and then manually inputs the measurement data into a store terminal or the like. In this case, it is necessary to enter the measurement data into the dimension chart and to input the measurement data into the terminal, which is a double effort.

In order to solve this problem, there is known a device capable of inputting measurement data into a terminal without using a size chart (see, for example, Patent Document 1). This device includes a measure for measuring the dimensions of each part of an object (person or object) and a transmitter equipped with the measure, which has a function of transmitting the measurement data; and a measure signal receiver/recorder that prints the In the transmitter, a reader optically reads a binary code composed of white dots and black dots attached to the measure, decodes the read data, and transmits the decoded data to the receiver/recorder.

JP-A-7-35535

When using a binary code, the number of digits of the binary code increases as the length of the object to be measured increases. Therefore, when a binary code with a large number of digits is attached to a measure, it is necessary to increase the width of the measure. Also, in order to read a binary code with a large number of digits, it is necessary to increase the number of reading sensors of the reader. Therefore, there is a problem that the size of the transmitter cannot be avoided.

SUMMARY OF THE INVENTION An object of the present invention is to provide a code conversion method capable of miniaturizing the device.

In order to achieve the above object, the code conversion method disclosed in the specification is a code conversion method for converting between a ternary number and a ternary Gray code in which no binary change occurs . When a digit is set, and the sum of the numerical values of the digits higher than the digit to be converted is 0 or an even number, or when the numerical value of the digit to be converted is an odd number and the numerical value of the digit to be converted is 1, the conversion target If the value of the digits to be converted is maintained as it is, and the sum of the values of the digits higher than the digit to be converted is an odd number and the value to be converted is 0, the value of the digit to be converted is set to 2. and converting the numerical value of the digit to be converted to 0 when the sum of the numerical values of the digits higher than the digit to be converted is an odd number and the numerical value to be converted is 2. do.

According to the present invention, it is possible to reduce the size of the device.

1 is a configuration diagram of a length measuring instrument according to this embodiment; FIG. FIG. 10 is a diagram showing reading processing of a ternary color pattern; (A) is a diagram showing an example of a ternary color pattern. (B) is a diagram showing an example of a ternary Gray code color pattern. FIG. 10 is a diagram showing a color pattern reading process using a ternary Gray code; FIG. 4 is a diagram showing an example of a color pattern of a code that is an improvement of a ternary Gray code using three colors; FIG. 2 is a diagram showing a method of creating a ternary Gray code in which no binary change occurs from a ternary Gray code; It is a flowchart which shows the processing operation of a measuring device.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of a length measuring instrument according to this embodiment.

A length measuring device (hereinafter referred to as "measuring device") 1 has a reading unit 2 that reads the color pattern of a measure 7a with a multi-digit color pattern, and measures the length of the object from the data read by the reading unit 2. a microcomputer 3 as a measuring means, a communication device 4 that transmits the data of the calculated length of the object to be measured to the external terminal 10 by wire or wirelessly, a switch 5 that instructs the microcomputer 3 to start measurement, and a reading unit 2. It has a battery 6 that supplies power to the microcomputer 3 and the communication device 4, and a storage unit 7 that stores a measure 7a.

The reading unit 2 includes an LED (Light Emitting Diode) 8 that irradiates the color pattern with light, and a phototransistor (PT) 9 that receives the reflected light from the color pattern and converts the amount of received light into a current value or a voltage value. and The LED 8 emits at least one of infrared rays, visible rays and ultraviolet rays, and the PT 9 receives at least one of the infrared rays, visible rays and ultraviolet rays reflected by the color pattern. In this embodiment, the LEDs 8 and PT9 are provided for the number of digits of the color pattern, and although there are six sets of the LEDs 8 and PT9 in FIG. 1, the number of sets is not limited to this. Also, in the present embodiment, the LED 8 is used as the light emitting means and the PT 9 is used as the light receiving means, but light emitting elements other than the LEDs and light receiving elements other than the PT may be used.

The microcomputer 3 controls the ON/OFF of the LED 8 and reads the current value or voltage value of the PT9. Since the reflectance differs depending on the color of the color pattern, and the amount of light received by the PT9 fluctuates according to the reflectance, the microcomputer 3 can determine the color based on the current value or voltage value output from the PT9. For example, when the voltage value output from PT9 is 2.0V, 1.5V or 1.0V, the microcomputer 3 determines that the color pattern is white, blue or black, respectively.

In the measure 7a, scales are printed along the length direction on the front surface, and for example, on the back surface, there is a code color pattern improved from the N-ary gray code using N (N≧3; the same shall apply hereinafter) colors. It is printed every fixed length. A code obtained by improving the N-ary Gray code will be described later. Also, each digit of the color pattern may use, for example, the same color having N or more different densities instead of N different colors. However, such differences in density are treated as "different colors" in the present application. The storage unit 7 is attached to the housing of the measuring instrument 1 and can be removed from the housing of the measuring instrument 1 .

The external terminal 10 is a communication terminal having a wired or wireless communication function, such as a computer or a smart phone, receives data on the length of the object to be measured from the communication device 4, registers it in a database, and manages it. The database for registering the length data of the object to be measured may be built in the external terminal 10, or may be provided outside the external terminal 10 in an accessible state.

FIG. 2 is a diagram showing reading processing of a ternary color pattern.

The ternary color pattern 11 is composed of, for example, six digits, and three colors of white, blue and black are adopted as colors corresponding to 0, 1 and 2 of the ternary numbers. Reflectance decreases in the order of white, blue, and black. In FIG. 2, ternary numerical values and digit numbers corresponding to each color are shown for convenience of explanation, but ternary numerical values and digit numbers are not shown in actual color patterns. It is also assumed that the voltage values output from PT9 are analog data, and the voltage values output from PT9 are 2.0 V, 1.5 V and 1.0 V when white, blue and black are read, respectively.

A set of LEDs 8 and PT 9 are assigned to read one digit pattern of the color pattern 11 .

When area 21 of color pattern 11 is read, PT9 corresponding to digit numbers 1 to 3 of white outputs 2.0V, and PT9 corresponding to digit numbers 4 and 6 of blue outputs 1.0V. PT9, which outputs 5V and corresponds to black digit number 5, outputs 1.0V. The microcomputer 3 determines the color of each digit based on the voltage value from each PT 9 and converts it into a corresponding ternary number. In the example of FIG. 2, the pattern in area 21 is converted to the ternary number "000121". The microcomputer 3 converts the ternary number "000121" into a decimal number to calculate the length of the object to be measured. In area 21, ternary "000121" is converted to decimal "16". In FIG. 2, the number resulting from reading area 21 matches the number assigned to area 21 .

On the other hand, since the area 22 of the color pattern 11 spans two rows, when the area 22 is read, the PT9 whose both rows correspond to the white digit number 1 to digit number 3 outputs 2.0V. The PT9 corresponding to digit number 4 with one row white and the other blue will output 1.75V, and the PT9 corresponding to digits 5 and 6 with one row white and the other black will output 1.5V. to output Since the voltage value output from the PT 9 is thus analog data, when the boundary between the color patterns 11 is read, the intermediate value between the colors of the adjacent upper and lower patterns is measured.

The microcomputer 3 converts the pattern of the area 22 into ternary numbers "000011" or "000111" based on the voltage value from each PT9, converts this value into a decimal number, and calculates the length of the object to be measured. . However, the decimal numbers '4' or '13' converted from the ternary numbers '000011' or '000111' are not identical to the decimal numbers '8' or '9', which both correspond to locations in region 22. Therefore, the length of the object to be measured calculated by the microcomputer 3 does not match the actual length, resulting in a reading error. In this way, reading errors occur at the borders of the color patterns 11, so the measuring instrument 1 cannot adopt the color patterns 11 of FIG.

FIG. 3A is a diagram showing an example of a ternary color pattern 11, and FIG. 3B is a diagram showing an example of a color pattern 12 based on a ternary Gray code.

As described above, at the boundary between color patterns, the intermediate value of adjacent upper and lower patterns is measured. An error may occur between the length of the object to be measured.

One of the causes of errors is that color changes (numerical changes) occur in multiple digits in upper and lower patterns adjacent to each other, as shown in regions 23 to 25 in FIG. 3(A). For example, in regions 23 and 24, color changes occur at digit number five and digit number six. In region 25, color change occurs at digit number 4-digit number 6. FIG.

In order to eliminate the occurrence of errors, it is conceivable to adopt a color pattern 12 based on a ternary Gray code as shown in FIG. 3(B). In the color pattern 12, the upper and lower patterns adjacent to each other have a color change of only one digit.

FIG. 4 is a diagram showing the reading process of the color pattern 12 by the ternary Gray code.

When area 27 of color pattern 12 is read, PT9 corresponding to white digit number 1 to digit number 3 outputs 2.0V, and PT9 corresponding to blue digit number 4 and digit number 6 outputs 1.5V. PT9 corresponding to black digit number 5 outputs 1.0V. The microcomputer 3 determines the color of each digit based on the voltage value from each PT9 and converts it into corresponding ternary gray code. In the example of FIG. 4, the ternary Gray code "000121" is determined from the pattern in region 27. In the example of FIG. The microcomputer 3 converts the ternary Gray code "000121" into a decimal number to calculate the length of the object to be measured. A method for converting a ternary Gray code to a ternary number and a method for converting a ternary number to a decimal number are known methods. In region 27, the ternary Gray code "000121" is converted to decimal "10". Since the position of the area 27 of the color pattern 12 corresponds to the decimal number "10", the length of the object to be measured calculated by the microcomputer 3 matches the length indicated by the measure 7a, and the reading accuracy is good.

On the other hand, when the area 28 of the color pattern 12 is read, the PT9 corresponding to the digit numbers 1 to 4 with white top and bottom output 2.0V respectively, the digit number 5 with blue top and bottom and black on one line and black on the other line. The PT9 corresponding to the white digit number 6 each output the same 1.5V. In the example of FIG. 4, the ternary Gray code corresponding to the pattern in region 28 is "000011". The microcomputer 3 converts the ternary Gray code "000011" into a decimal number to calculate the length of the object to be measured. The ternary Gray code "000011" in area 28 is converted to decimal "5". Since the position of the area 28 of the color pattern 12 corresponds to the decimal number "3" or "4", it does not match the decimal number calculated by the microcomputer 3. FIG. Therefore, the color pattern 12 cannot be adopted in the measuring instrument 1 either.

The reason why an error occurs even if the color pattern 12 is used is that each digit of the upper and lower patterns adjacent to the boundary of the color pattern 12 may cause a binary change. A binary change means that the difference between the numerical values of the same digit in the upper and lower patterns is 2 or more, that is, there is a change from white to black in the color pattern 12 of FIG.

In digit number 6 of area 28 of color pattern 12, the upper pattern adjacent to the boundary is black (2) and the lower pattern is white (0). In this case, PT9 corresponding to digit number 6 outputs 1.5V, but since this is the same as the output value of PT9 when blue is read, the microcomputer 3 judges digit number 6 as blue. . Therefore, an error occurs between the actual length of the object to be measured and the length of the object to be measured calculated by the microcomputer 3 .

If the numerical value change between the adjacent upper and lower patterns of the color pattern 12 is a single value change, such an error does not occur. The 1-value change means that the difference between the numerical values of the same digit in the upper and lower patterns is 1, that is, the color pattern 12 in FIG.

FIG. 5 is a diagram showing an example of a color pattern 13 of a code improved from a ternary Gray code using three colors.

In the color pattern 13, the color change or numerical value change of the upper and lower patterns adjacent to each other occurs only in one digit, and the numerical value change is a single value change. Color pattern 13 thus corresponds to a ternary Gray code in which no binary changes occur. In other words, in the color pattern 13, a plurality of patterns each assigned a different number are arranged, and each of the plurality of patterns has a plurality of digits assigned a numeric value in base N (N is 3 or more). , and each digit has a different color depending on the numerical value assigned to it. A plurality of patterns are arranged in ascending or descending order, the Hamming distance between patterns adjacent to each other in the arrangement direction is 1, and the amount of change in numerical value between digits between adjacent patterns is 1.

By using the color pattern 13, even if the boundary between the adjacent upper and lower patterns is read and the intermediate voltage value between the adjacent upper and lower patterns is output from the PT 9, the microcomputer 3 will correspond the voltage value to either of the upper and lower patterns. Since it can be converted into decimal numbers, no substantial error occurs between the actual length of the object to be measured and the length of the object to be measured calculated by the microcomputer 3 .

FIG. 6 is a diagram showing a method of generating a ternary Gray code in which no binary change occurs from a ternary code.

The conversion rule for creating a ternary Gray code in which no binary change occurs from a ternary code is as follows.
(1) If the sum of the numerical values of the digits higher than the digit to be converted is 0 or an even number, the numerical value of the digit to be converted is maintained.
(2) If the sum of the numerical values of the digits higher than the digit to be converted is an odd number and the numerical value of the digit to be converted is 1, the numerical value of the digit to be converted is maintained.
(3) If the sum of the numerical values of the digits higher than the digit to be converted is an odd number and the numerical value of the digit to be converted is 2, convert the numerical value of the digit to be converted to 0.
(4) If the sum of the numerical values of the digits higher than the digit to be converted is an odd number and the numerical value of the digit to be converted is 0, convert the numerical value of the digit to be converted to 2.

It is assumed that digit number 1 is the highest digit and digit number 6 is the lowest digit. In addition, the ternary code before conversion in FIG. 0 is set as a fixed value in the 0 digit.

As an example, a method of generating a ternary Gray code in which no binary change occurs from the ternary code of "001010" shown in FIG. 6 will be described.

First, consider conversion of "0" of digit number 6 before conversion. Since the sum of the numerical values of digit number 0 to digit number 5 higher than digit number 6 is 2 (an even number), "0" of digit number 6 is maintained according to the above conversion rule (1). Next, since the sum of the numerical values of digit number 0 to digit number 4 higher than digit number 5 before conversion is 1 (odd number) and the numerical value of digit number 5 is "1", the above (2) The "1" in digit number 5 is maintained according to the conversion rules.

Next, since the sum of the numerical values of the digit numbers 0 to 3 higher than the digit number 4 before conversion is 1 (odd number) and the numerical value of the digit number 4 is "0", the above conversion rule (4) "0" of digit number 4 is converted to "2" according to Next, since the sum of the numerical values of digit numbers 0 to 2 higher than digit number 3 before conversion is 0, "1" of digit number 3 is maintained according to the above conversion rule (1).

Since the sum of the numerical values of digit numbers 0 to 1 higher than digit number 2 before conversion is 0, "0" of digit number 2 is maintained according to the above conversion rule (1). Finally, since the numeric value of digit number 0, which is higher than digit number 1 before conversion, becomes 0, the "0" of digit number 1 is maintained according to the above conversion rule (1).

By this procedure, "001010" shown in FIG. 6 is converted into ternary Gray code "001210" in which no binary change occurs.

In addition, according to the conversion rules (1) to (4) above, the ternary Gray code in which no binary change occurs can be reversely converted to the original ternary code.

By determining the conversion rule corresponding to the N-ary code in this way, it is possible to create an N-ary Gray code in which no binary change occurs from the N-ary code .

FIG. 7 is a flow chart showing the processing operation of the measuring instrument 1. As shown in FIG.

First, when the switch 5 is pressed, the microcomputer 3 is instructed to start measurement (S1). The microcomputer 3 turns on each LED 8 (S2), and the LED 8 irradiates the color pattern 13 with light (S3). Each PT 9 receives reflected light from the color pattern 13 and converts the amount of received light into a current value or a voltage value (S4). The microcomputer 3 reads the current value or voltage value of each PT9 (S5).

The microcomputer 3 judges the color of the color pattern 13 expressed by the N-ary gray code that does not cause a binary change depending on the current value or voltage value output from each PT 9, and based on the conversion rule corresponding to the N-ary code . N- adic values are obtained from the color pattern 13 using the color pattern 13, and the N-adic values are converted into decimal values based on a known conversion method (S6). The microcomputer 3 may be provided in advance with a table showing the correspondence between the colors of the color pattern 13 and the decimal values, and may calculate the decimal values based on this table. Then, the microcomputer 3 transmits the data of the length of the object to be measured converted into decimal numbers to the external terminal 10 via the communication device 4 (S7), and ends this process.

As described above, according to the present embodiment, the measuring instrument 1 has a plurality of patterns each assigned a different number, and each of the plurality of patterns is an N-ary number (N is 3 or more). Each digit has a different color according to the assigned numerical value, multiple patterns are arranged in ascending or descending order, and the Hamming distance between adjacent patterns in the arrangement direction is 1, and the amount of change in the numerical value between the digits of adjacent patterns is 1. Measured from a measure 7a printed with a code, a reading unit 2 that optically reads the pattern, and the result of reading by the reading unit 2. and a microcomputer 3 for measuring the length of an object.

Therefore, since the pattern is an N-ary number of 3 or more, the number of digits constituting the pattern can be reduced and the width of the measure 7a can be reduced compared to the case where a binary code is attached to the measure. Also, the number of reading sensors for reading a pattern with a large number of digits, that is, the number of LEDs 8 and PTs 9 can be reduced. Therefore, it is possible to reduce the size of the device.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

1 length measuring instrument 2 reading unit 3 microcomputer 4 communication device 7 storage unit 7a measure 8 LED
9 phototransistor

Claims (1)

In a code conversion method for converting between a ternary number and a ternary Gray code in which no binary change occurs ,
Set the digits to be converted in order from the lower digits of the conversion source ,
If the sum of the numerical values of the digits higher than the digit to be converted is 0 or an even number, or if the numerical value of the digit to be converted is an odd number and the numerical value of the digit to be converted is 1, the numerical value of the digit to be converted is keep it as is
when the sum of the numerical values of the digits higher than the digit to be converted is an odd number and the numerical value to be converted is 0, converting the numerical value of the digit to be converted to 2;
A code conversion characterized by converting the numeric value of the digit to be converted to 0 when the sum of the numeric values of the digits higher than the digit to be converted is an odd number and the numeric value to be converted is 2. Method.

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