JP4910822B2 - Bar code reader and program - Google Patents

Description

  The present invention relates to a barcode reader and a program.

In order to obtain barcode data having a width wider than the reading range of the scanner, it is necessary to scan while moving the scanner with respect to the barcode surface. Conventionally, in order to obtain barcode data by scanning such a wide barcode, the user scans the barcode at a predetermined scanning speed (for example, 100 scans / second) while moving the scanner in the bar arrangement direction. Scanning was performed, and barcode pattern matching was performed each time scanning was performed, and synthesis was performed little by little based on the matched portion (see, for example, Patent Document 1).
Japanese Unexamined Patent Publication No. 7-57035

  Conventionally, however, barcode pattern matching is performed for each scan. Therefore, if the scanner movement distance for each scan is shortened, the number of times pattern matching and synthesis processing is performed increases, resulting in poor processing efficiency. It was.

  An object of the present invention is to improve the efficiency of barcode data synthesis processing.

The barcode reading apparatus according to claim 1 stores reading means for sequentially acquiring the barcode data by sequentially reading the barcode as the reading range of the barcode is moved, and storing each barcode data acquired by the reading means. Storage means, detection means for detecting the movement state of the reading means in a three-dimensional space, and the amount of movement of the reading means necessary for synthesizing the barcode data based on the movement state detected by the detection means Determining means for determining whether or not the reading means has moved by the calculated movement amount, and the determination means determines that the reading means has moved by the calculated movement amount. If the, and a bar code data obtained before the move, and combining means for combining the bar code data obtained after the movement, it is synthesized by the synthesizing means And and a decoding means for decoding the bar code data.

According to a second aspect of the present invention, in the barcode reading apparatus according to the first aspect, the barcode reading device includes a correcting unit that corrects the acquired barcode data based on the movement state detected by the detecting unit, The synthesizing unit synthesizes the barcode data corrected by the correcting unit.

  According to a third aspect of the present invention, in the barcode reading apparatus according to the first or second aspect, the detection means detects the moving state using a gyro sensor, and the gyro sensor is in a three-dimensional space. An acceleration sensor that detects an acceleration of the reading unit; and an inclination sensor that detects an inclination of the reading unit caused by the movement of the reading unit in a three-dimensional space.

According to a fourth aspect of the present invention, in the barcode reading apparatus according to any one of the first to third aspects, the detection means is in a moving state in which the reading means moves closer to the barcode or the reading means. When the reading means moves so as to approach the bar code, the correction means detects the bar according to the moving distance of the reading means. When the barcode image data is corrected so that the width becomes narrower and the reading means moves away from the barcode surface, the bar width is increased so that the bar width increases according to the moving distance of the reading means. Correct the code image data.
According to a fifth aspect of the present invention, in the barcode reader according to any one of the first to fourth aspects, the detection means is a moving state in which the reading means is inclined with respect to the barcode and irradiated with light. The correction means corrects the bar width of the barcode image data according to the inclination angle of the reading means when the reading means is inclined with respect to the barcode and irradiated with light.
According to a sixth aspect of the present invention, in the barcode reading apparatus according to any one of the first to fifth aspects, the detection unit has a moving state in which the reading unit moves in the bar arrangement direction with respect to the barcode. When the reading means moves in the bar array direction with respect to the barcode, the correction means corrects the width of the start margin of the barcode image data according to the moving distance of the reading means.
A seventh aspect of the present invention is the barcode reading apparatus according to any one of the first to sixth aspects, wherein the detection means emits light with the reading means inclined with respect to the bar arrangement direction of the barcode. The irradiation movement state is detected, and the correction means responds to the inclination angle of the reading means with respect to the bar arrangement direction when the reading means is irradiated with light inclined with respect to the bar arrangement direction of the barcode. Correct the bar width of the barcode image data.
According to an eighth aspect of the present invention, the computer causes the barcode to be read sequentially by the reading means along with the movement of the reading range with respect to the barcode, the barcode data is obtained, and the obtained barcode data is stored. Means for storing, means for detecting a movement state of the reading means in a three-dimensional space, means for calculating a movement amount of the reading means necessary for synthesizing barcode data based on the detected movement state, Means for determining whether or not the reading means has moved by the calculated amount of movement; if it is determined that the reading means has moved by the calculated amount of movement, the barcode data acquired before the movement When a professional to function means for combining the bar code data obtained after the movement, means for decoding the bar code data to which the synthesized as, It is a lamb.

  According to the present invention, by performing the barcode synthesis process based on the moving state of the reading means, the number of synthesis processes can be greatly reduced, and the barcode data synthesis process can be made more efficient.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The barcode reader 1 according to the embodiment of the present invention is assumed to be a hand-held type in which the user reads the barcode while holding the scanner portion in his hand. In the present embodiment, the width of the entire barcode to be read is wider than the range that the barcode reader 1 can read at one time, and this reading range is continuously moved in the bar arrangement direction. It is assumed that the entire barcode is read.

First, the configuration in the present embodiment will be described.
FIG. 1 shows a main part configuration of a barcode reading apparatus 1 according to an embodiment of the present invention. As shown in FIG. 1, the barcode reader 1 includes a CPU (Central Processing Unit) 10, a display unit 11, an input unit 12, a storage unit 13, a RAM (Random Access Memory) 14, a reading unit 15, and a gyro sensor 16. Each unit is electrically connected via the bus 17 and receives power supply from the power supply unit 18.

  The CPU 10 develops various control programs stored in the storage unit 13 in the RAM 14 and performs various processes in cooperation with the control programs. Specifically, the CPU 10 performs a barcode reading process according to a control program stored in the storage unit 13 (see FIG. 2).

  The display unit 11 includes a display such as an LCD (Liquid Crystal Display), and performs a required display process according to a display control signal input from the CPU 10.

  The input unit 12 includes various keys such as a trigger key for starting barcode reading, and a touch panel provided so as to cover the display screen of the display unit 11, and an operation signal generated by key operation or touch panel operation. Is output to the CPU 10.

  The storage unit 13 stores various control programs executed by the CPU 10 and data necessary for executing these control programs.

  The RAM 14 has a program storage area for developing various control programs executed by the CPU 10 and a data storage area for temporarily storing input data and data such as processing results generated when the control program is executed.

  The reading unit 15 includes a CMOS (Complementary Metal Oxide Semiconductor) image sensor, a CCD (Charge Coupled Device) image sensor, an A / D converter, or the like. The reading unit 15 uses a CMOS image sensor or a CCD image sensor to read a barcode with reflected light of a laser beam irradiated on the barcode to be read, and photoelectrically converts the optical image signal obtained by the reading into an electrical signal (analogue). Signal), and the analog signal is converted into a digital signal by an A / D converter to obtain barcode data.

  The barcode data acquired by the reading unit 15 is represented as a counter value indicating the width of the white or black bar of the barcode. For example, the white width is 60, the black width is 10, the white width is 20,... Hereinafter, the barcode data acquired by the reading unit 15 is referred to as “bar data”.

  The gyro sensor 16 includes an acceleration sensor 161 and an inclination sensor 162, and detects the movement state of the reading unit 15 in a three-dimensional space. The acceleration sensor 161 detects the acceleration of the reading unit 15 moved in the three-dimensional space, the time moved, and the direction moved. Based on the information detected by the acceleration sensor 161, the moving distance of the reading unit 15 can be calculated. The tilt sensor 162 detects the tilt of the reading unit 15 caused by the movement of the reading unit 15 in the three-dimensional space. Based on the inclination detected by the inclination sensor 162, the light irradiation angle with respect to the barcode surface can be calculated.

Next, the operation in this embodiment will be described.
First, the barcode reading process executed under the control of the CPU 10 of the barcode reading apparatus 1 will be described with reference to the flowchart of FIG.

  When the trigger key of the input unit 12 is pressed, reading of the barcode is started by the reading unit 15 at a predetermined scanning speed (for example, 100 scans / second) (step S1). If the time is within the time-out period after the trigger key is pressed (step S2; NO), the bar data is acquired by reading the bar code and stored in the RAM 14 (step S3).

  Next, a decoding process is performed on the bar data acquired in step S3 (step S4). In the decoding process in step S4, the white and black arrays represented by the bar data are converted into data representing numerical values and character arrays.

  When the decoding process is completed, it is determined whether or not the decoding process can be normally performed in the decoding process of step S4 (step S5). If it is determined in step S5 that decoding has been performed normally (step S5; YES), the bar data combining process is set to “invalid” (step S9), and the barcode reading process ends.

  If it is determined in step S5 that the data cannot be normally decoded (step S5; NO), the bar data acquired in step S3 is corrected (step S6), and then the corrected bar is displayed. Data synthesis processing is performed (step S7). Here, the correction processing of the bar data is performed before the combining processing of the bar data because the actually acquired bar data is read from the preset reference position due to the shake of the user's hand or the like. This is because there is a high possibility that the data is different from the bar data acquired when the data is received.

  The correction process in step S6 will be described in detail later with reference to FIGS. Further, the combining process in step S7 will be described in detail later with reference to FIGS.

  In the synthesizing process in step S7, the decoding process is performed again after synthesizing the bar data. Then, after completion of step S7, it is determined whether or not the synthesized bar data has been successfully decoded (step S8).

  If it is determined in step S8 that the combined bar data has not been successfully decoded (step S8; NO), the process returns to step S2, and the processes in and after step S3 are repeated until time-out occurs.

  On the other hand, if it is determined in step S8 that the combined bar data has been successfully decoded (step S8; YES), the subsequent bar data combining process is set to “invalid” (step S9). The barcode reading process ends.

  Next, with reference to the flowchart of FIG. 3 and FIG. 4, the bar data composition processing (step S7 of FIG. 2) will be described. FIG. 3 illustrates a synthesis process of bar data (that is, bar data acquired when read from a preset reference position) after a correction process described later is performed.

  First, it is determined whether or not the bar data combining process is set to “valid” (step S11). It is assumed that the barcode synthesis process is set to “invalid” at the time of starting barcode reading.

  When the bar data composition processing is not set to “valid” in step S11, that is, when it is determined that it is set to “invalid” (step S11; NO), the bar data acquired by the first reading A start code or stop code is detected (step S12), and it is determined whether the start code or stop code has been detected (step S13).

  In step S13, when it is determined that the start code or the stop code cannot be detected (step S13; NO), the synthesis process ends. On the other hand, if it is determined in step S13 that the start code or stop code has been detected (step S13; YES), the bar data composition processing is set to “valid” (step S14).

  In addition, the composition travel distance indicating the travel distance necessary for the next composition is set to 0 (step S15), and the current position information is reset in the gyro sensor 16 (step S16). Further, the bar data acquired by the first reading is stored in the RAM 14 (step S17), and the process returns to step S8 in FIG.

  If it is determined in step S11 that the barcode combining process is set to “valid” (step S11; YES), it is determined whether the combining moving distance is set to 0 (step S18). ). If it is determined in step S18 that the composition moving distance is set to 0 (step S18; YES), a start code or a stop code is detected from the bar data acquired in the second reading (step S19). ).

  Next, it is determined whether or not the start code or stop code pattern detected in step S19 matches the start code or stop code pattern detected in the first reading (step S20).

  If it is determined in step S20 that the two patterns do not match (step S20; NO), the process proceeds to step S24, and the previously acquired (first time) bar data is cleared from the RAM 14 (step S24), and this time (2 (Second time) The acquired bar data is stored in the RAM 14 (step S25), and the process returns to step S8 in FIG.

  On the other hand, when it is determined in step S20 that both patterns match (step S20; YES), the moving distance detected by the gyro sensor 16 is acquired (step S21), and one counter is based on the acquired moving distance. A value movement distance (movement distance per counter value) is calculated (step S22).

As shown in FIG. 4, the light irradiation lines (reading ranges) on the barcode surface at the time of the first reading and the second reading are L1 and L2, respectively. At this time, the counter values until the first black of the bar code acquired in the first and second readings are C1 and C2, respectively, and the moving distance detected by the gyro sensor 16 between the first and second readings. Is ΔX1, the moving distance ΔX of one counter value is calculated as in equation (1).
ΔX = ΔX1 / (C1-C2) (1)

When the moving distance of one counter value is calculated, the moving distance for composition indicating the moving distance necessary until the next combining from the total of the counter values of the bar data acquired by the current reading and the moving distance of the one counter value. Is calculated (step S23). In FIG. 4, assuming that the total counter value of the bar data acquired for the second time is CW1, the composition moving distance ΔX2 is calculated as shown in the equation (2) using the moving distance ΔX of one counter value.
ΔX2 = CW1 × ΔX (2)

  After calculation of the moving distance for composition, the bar data acquired last time (first time) is cleared from the RAM 14 (step S24), and the bar data acquired this time (second time) is stored in the RAM 14 (step S25). Return to step S8.

  If it is determined in step S18 that the composition travel distance is not 0 (step S18; NO), the gyro sensor 16 detects that the reading unit 15 has moved by the composition travel distance (step S26; YES), previously acquired bar data (i.e., bar data acquired immediately before moving for the moving distance for compositing), and bar data acquired this time (i.e., the bar acquired immediately after moving for the moving distance for compositing) Data) is synthesized (step S27).

  In step S27, as shown in FIG. 4, the bar data acquired for the second time (bar data acquired immediately before moving for the moving distance for combining ΔX2) and the moving distance for combining ΔX2 from the time of the second reading. The bar data acquired in the irradiation line L3 immediately after the movement is combined. In FIG. 4, “first time”, “second time”, “third time”,... Indicate the minimum number of readings required for synthesizing the bar data, and the reading unit 15 actually reads at a predetermined scanning speed. It does not indicate the number of times.

  After the combining in step S27, the combined bar data is decoded (step S28). When the decoding process is completed, it is determined whether or not the decoding process can be normally performed in the decoding process of step S28 (step S29). In step S29, when it is determined that the decoding can be normally performed (step S29; YES), the synthesis process ends, and the process returns to step S8 in FIG.

  On the other hand, if it is determined in step S29 that the data could not be decoded normally (step S29; NO), as in equation (2), the total counter value of the bar data acquired in the current reading is By multiplying the movement distance ΔX of one counter value calculated in step S22, a composition movement distance representing a movement distance necessary for the next composition is calculated (step S30). After the end of step S30, the bar data synthesized in step S27 is stored in the RAM 14 (step S31), and the process returns to step S8 in FIG.

  Next, the bar data correction process (step S6 in FIG. 2) will be described in detail with reference to the flowchart in FIG. 5 and FIGS.

  In the present embodiment, the bar data correction process refers to a bar actually acquired from the reading unit 15 based on the movement state of the reading unit 15 in the three-dimensional space (xyz) acquired from the gyro sensor 16. This is a process of correcting the data to bar data acquired when the data is read from a preset reference position. In the following description, it is assumed that the central portion of the barcode surface is the origin O of the orthogonal coordinate system, the direction perpendicular to the barcode surface is the x-axis direction, and the direction in which each bar on the barcode surface is arranged is the y-axis direction.

  In the present embodiment, the movement state in the three-dimensional space of the reading unit 15 acquired from the gyro sensor 16 is classified into the following five types based on the irradiation state from the light source OS of the reading unit 15, and the respective movement states are classified. A corresponding correction process (correction H1 to correction H5) will be described.

[1] A state in which light is irradiated so as to approach the barcode surface β (see FIG. 6);
[2] A state of irradiating light away from the barcode surface β (see FIG. 9);
[3] A state in which light is irradiated so as to be inclined with respect to a reference direction (parallel to the x-axis direction) in the xy plane (see FIG. 12);
[4] A state in which light is irradiated so as to move in the bar array direction (y-axis direction) with respect to the barcode surface β (see FIG. 15);
[5] A state in which light is irradiated such that the irradiation line on the barcode surface β is inclined with respect to the bar arrangement direction (y-axis direction) (see FIG. 18).

  Note that the movement state actually detected by the gyro sensor 16 is a combination of the movement states corresponding to the above [1] to [5], but these combined movement states are the above [1] to [1] to [5]. By performing the correction process for each moving state separately in [5], a result equivalent to the correction process for the combined moving state is finally obtained.

  In the bar data correction process shown in FIG. 5, first, the movement state of the reading unit 15 is acquired from the gyro sensor 16 (step S40). Then, the light is emitted so that the moving state is irradiated with light so as to approach the barcode surface β as shown in FIG. 6 (moving state [1]) or away from the barcode surface β as shown in FIG. It is determined whether or not the irradiation state (movement state [2]) is included (step S41).

  If it is determined in step S41 that the movement state acquired from the gyro sensor 16 includes the movement state [1] or the movement state [2] (step S41; YES), the following correction H1 or correction H2 is performed. (Step S42).

[Correction H1]
In the moving state [1] shown in FIG. 6, as the light source OS approaches the barcode surface β, the width of the light irradiation line L on the barcode surface β becomes narrower as shown in FIG. Therefore, as shown in FIG. 7B, the width of each bar actually recognized by the reading unit 15 is larger than the original width shown in FIG. In FIG. 7A and FIG. 7B, “bar width” corresponding to each of white and black is a counter value representing the width of the bar. The same applies to the following FIG. 10, FIG. 13, FIG. 16, and FIG.

The rate at which the bar width increases in accordance with the movement distance of the light source OS of the reading unit 15 varies depending on the characteristics of the scanner module used in the reading unit 15, and is set in advance as a function of the movement distance. For example, as shown in FIG. 8, the bar width acquired by the first reading is B1, the bar width acquired by the second reading is B2, the movement distance of the light source OS acquired from the gyro sensor 16 is ΔD, When the rate at which the bar width becomes thicker according to the movement distance is the correction coefficient f1, the bar width after the correction with the correction H1 is expressed as in Expression (3).
Bar width after correction = bar width before correction × ΔD × f1 (3)

[Correction H2]
In the moving state [2] shown in FIG. 9, as the light source OS moves away from the barcode surface β, the light irradiation line L on the barcode surface β becomes wider as shown in FIG. Therefore, as shown in FIG. 10B, the width of each bar actually recognized by the reading unit 15 is narrower than the original width shown in FIG.

The rate at which the bar width is reduced according to the moving distance varies depending on the characteristics of the scanner module used in the reading unit 15 and is set in advance. For example, as shown in FIG. 11, the bar width acquired by the first reading is B1, the bar width acquired by the second reading is B2, the movement distance of the light source OS acquired from the gyro sensor 16 is ΔD, When the rate at which the bar width is reduced according to the moving distance is the correction coefficient f2, the bar width after the correction with the correction H2 is expressed as in Expression (4).
Bar width after correction = bar width before correction × ΔD × f2 (4)

  When it is determined in step S41 in FIG. 5 that the movement state acquired from the gyro sensor 16 does not include either the movement state [1] or the movement state [2] (step S41; NO), or When the correction H1 or the correction H2 is completed, the movement state acquired from the gyro sensor 16 is light so as to be inclined with respect to the reference direction (parallel to the x-axis direction) in the xy plane as shown in FIG. It is determined whether or not the state (moving state [3]) is included (step S43).

  In step S43, when it is determined that the movement state acquired from the gyro sensor 16 includes the movement state [3] (step S43; YES), the following correction H3 is performed (step S44).

[Correction H3]
As shown in FIG. 12, when the light irradiation direction is inclined with respect to the x-axis, the irradiation line L on the barcode surface β shown in FIG. 13A is the position of the bar (value of the y coordinate). Depending on the distance from the light source OS. Therefore, in the movement state [3] shown in FIG. 12, as shown in FIG. 13B, since the distance from the light source OS becomes closer to the positive direction of the y-axis, the bar width becomes thicker and y Since the distance from the light source OS increases toward the negative direction of the axis, the bar width becomes narrower.

As shown in FIG. 14, when the light irradiation direction is inclined with respect to the x axis at an inclination angle Θ, the rate at which the bar width changes according to the bar position (y = Bd) is determined by the reading unit 15. It differs depending on the characteristics of the scanner module used, and is preset as a function of the bar position Bd and the inclination angle Θ acquired from the gyro sensor 16. When the rate at which the bar width changes is the correction coefficient f (Bd, Θ), the bar width after the correction with the correction H3 is expressed as shown in Equation (5).
Bar width after correction = bar width before correction × f (Bd, Θ) (5)

  When it is determined in step S43 in FIG. 5 that the movement state acquired from the gyro sensor 16 does not include the movement state [3] (step S43; NO), or when the correction H3 in step S44 ends, the gyro sensor As shown in FIG. 15, it is determined whether or not the movement state acquired from 16 includes a state (movement state [4]) in which light is irradiated so as to move in the y-axis direction with respect to the barcode surface β. (Step S45).

  In step S45, when it is determined that the movement state acquired from the gyro sensor 16 includes the movement state [4] (step S45; YES), the following correction H4 is performed (step S46).

[Correction H4]
In the case of the movement state [4] shown in FIG. 15, the irradiation line L on the barcode surface β shown in FIG. 16A moves in the bar arrangement direction, and therefore the barcode start margin recognized by the reading unit 15. The width (or the width of the end margin) changes as shown in FIG. Therefore, in the correction H4, the start margin width of the bar data acquired by the second reading is corrected based on the bar data having characteristics such as the start code, based on the bar data acquired by the first reading. To do.

As shown in FIG. 17, when the counter values up to the first black of the barcode in the first reading and the second reading are c1 and c2, respectively, the start margin width is corrected by cx = c1-c2. That's fine. That is, the width of the start margin after correction is expressed as Equation (6).
Width of start margin after correction = width of start margin before correction + cx (6)

  When it is determined in step S45 in FIG. 5 that the movement state acquired from the gyro sensor 16 does not include the movement state [4] (step S45; NO), or when the correction H4 in step S46 is completed, the gyro sensor As shown in FIG. 18, the movement state acquired from 16 is a state in which light is irradiated so that the irradiation line on the barcode surface β is inclined with respect to the bar arrangement direction (y-axis direction) (movement state [ 5]) is included (step S47).

  If it is determined in step S47 that the movement state acquired from the gyro sensor 16 includes the movement state [5] (step S47; YES), the following correction H5 is performed (step S48).

[Correction H5]
In the moving state [5] shown in FIG. 18, as shown in FIG. 19A, the irradiation line L on the barcode surface β is inclined with respect to the bar arrangement direction (y-axis direction). As shown in FIG. 19 (b), the width of each bar is larger than the original width shown in FIG. 19 (a).

For example, as shown in FIG. 20, when the first reading direction is parallel to the bar arrangement direction (bar width B1), and the second reading direction is inclined at an angle θ with respect to the bar arrangement direction, The bar width B obtained by correcting the bar width B2 obtained by the second reading is expressed as shown in Expression (7).
B = B2 · cosθ (7)

  However, in actual reading, since the first reading is not always parallel to the bar arrangement direction as shown in FIG. 20, the first reading is also performed in the bar arrangement direction as shown in FIG. The correction value of the bar width should be calculated including the case where it is inclined. As shown in FIG. 21, the bar width obtained by the first reading is B1, the bar width obtained by the second reading is B2, and the inclination angle acquired from the gyro sensor 16 between the first and second readings. Is θ. In this case, as shown in FIG. 22, in a triangle in which the lengths of the two sides are B1 and B2 and the angle between both sides is θ, the perpendicular line extending from the vertex corresponding to the angle θ to the opposite side (length C) The length B is a bar width correction value.

この三角形の面積は(１／２)Ｂ・Ｃ＝(１／２)Ｂ１・Ｂ２・sinθゆえ、補正後のバー幅Ｂは、式（９）のように算出される。

In the triangle of FIG. 22, the length C is calculated as shown in Equation (8).

Since the area of this triangle is (1/2) B · C = (1/2) B1 · B2 · sinθ, the corrected bar width B is calculated as shown in Equation (9).

  In Step S47 of FIG. 5, when it is determined that the movement state acquired from the gyro sensor 16 does not include the movement state [5] (Step S47; NO), or when the correction H5 in Step S48 is completed, the correction is performed. The bar data is stored in the RAM 14 (step S49), and the correction process is terminated.

  As described above, according to the barcode reader 1 of this embodiment, when reading a wide barcode, the movement distance of one counter calculated based on the movement distance ΔX1 first obtained from the gyro sensor 16 By using ΔX to calculate the travel distance (composition travel distance) necessary for combining the bar data, and combining the bar data before and after moving by the compositing travel distance, The overlapping portion is greatly reduced, and the number of times of performing the synthesis process is greatly reduced. This makes it possible to improve (optimize) the synthesis processing of bar data and improve the processing speed of decoding processing.

  Further, based on the movement state acquired from the gyro sensor 16, the bar data acquired by the reading unit 15 is corrected to the bar data when it is read from a preset reference position. It can be performed.

  Note that the description in the present embodiment can be changed as appropriate without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the correction processing when the light source OS moves in the substantially xy plane with respect to the barcode surface β has been described, but in addition to the movement states [1] to [5] described above. When correction processing corresponding to the movement state including movement in the z-axis direction is performed, more precise synthesis processing can be performed.

  In the above-described embodiment, the moving distance for synthesis is a value corresponding to the total bar width (total counter value) obtained by one reading by the reading unit 15, but the distance corresponding to an arbitrary width. May be set.

  In the above-described embodiment, the case where the moving state of the reading unit 15 is detected using the gyro sensor 16 has been described. However, if the moving state in the three-dimensional space can be detected, another sensor is used. May be.

The block diagram which shows the principal part structure of the barcode reader which concerns on embodiment of this invention. 6 is a flowchart showing a barcode reading process executed under the control of the CPU of the barcode reading apparatus according to the embodiment. The flowchart which shows the detail of the synthetic | combination process shown in FIG. The figure for demonstrating the synthetic | combination method of bar data. The flowchart which shows the detail of the correction | amendment process shown in FIG. The figure which shows typically the irradiation state of the light with respect to a barcode surface, Comprising: The figure which shows the state irradiated with light so that a barcode surface may be approached. The figure (a) which shows the barcode image data and light irradiation line of reading object, and the figure (b) which shows the barcode image data recognized by the reading part in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG. The figure which shows typically the irradiation state of the light with respect to a barcode surface, Comprising: The figure which shows the state irradiated with light so that it may distance from a barcode surface. The figure (a) which shows the barcode image data and light irradiation line of reading object, and the figure (b) which shows the barcode image data recognized by the reading part in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG. The figure which shows typically the irradiation state of the light with respect to a barcode surface, Comprising: The figure which shows the state irradiated with light so that it may incline from a reference direction (parallel to x-axis direction) in xy plane. FIG. 13A is a diagram showing barcode image data to be read and light irradiation lines, and FIG. 13B is a diagram showing barcode image data recognized by the reading unit in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG. The figure which shows typically the irradiation state of the light with respect to a barcode surface, Comprising: The figure which shows the state irradiated with light so that it may move to a y-axis direction with respect to a barcode surface. The figure (a) which shows the barcode image data and light irradiation line of reading object, and the figure (b) which shows the barcode image data recognized by the reading part in the irradiation state shown in FIG. The figure for demonstrating the correction method of the start margin width | variety in the irradiation state shown in FIG. The figure which shows typically the irradiation state of the light with respect to a barcode surface, Comprising: The figure which shows the state irradiated with the light so that the irradiation line on a barcode surface may incline with respect to the arrangement direction (y-axis direction) of a bar . FIG. 19A shows a barcode image data to be read and a light irradiation line, and FIG. 18B shows a barcode image data recognized by the reading unit in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG. The figure for demonstrating the correction method of the bar width in the irradiation state shown in FIG.

Explanation of symbols

1 Bar code reader 10 CPU
11 Display unit 12 Input unit 13 Storage unit 14 RAM
15 Reading unit 16 Gyro sensor 161 Acceleration sensor 162 Tilt sensor 18 Power supply unit

Claims (8)

Reading means for sequentially acquiring the barcode data by sequentially reading the barcode along with the movement of the reading range with respect to the barcode;
Storage means for storing each barcode data acquired by the reading means;
Detecting means for detecting a movement state of the reading means in a three-dimensional space;
Calculation means for calculating a movement amount of the reading means necessary for synthesizing the barcode data based on the movement state detected by the detection means;
Determination means for determining whether or not the reading means has moved by the calculated movement amount;
When the determination unit determines that the reading unit has moved by the calculated movement amount, a combining unit that combines the barcode data acquired before the movement and the barcode data acquired after the movement ; ,
Decoding means for decoding the barcode data synthesized by the synthesis means;
A barcode reader. Based on the movement state detected by the detection means, the correction means for correcting the acquired barcode data,
The barcode reading apparatus according to claim 1, wherein the combining unit combines the barcode data corrected by the correcting unit. The detection means detects the movement state using a gyro sensor,
The gyro sensor includes: an acceleration sensor that detects an acceleration of the reading unit in a three-dimensional space; and an inclination sensor that detects an inclination of the reading unit caused by the movement of the reading unit in a three-dimensional space. 3. The barcode reader according to 1 or 2. The detecting means detects either the moving state in which the reading means has moved closer to the barcode or the moving state in which the reading means has moved away from the barcode,
The correction means corrects the barcode image data so that a bar width becomes narrow according to a moving distance of the reading means when the reading means moves so as to approach the barcode, and the reading means 4. The barcode image data is corrected so that a bar width is increased according to a moving distance of the reading unit when the barcode is moved away from the barcode surface. The barcode reader described in 1. The detection unit detects a moving state in which the reading unit is irradiated with light inclined with respect to the barcode,
The correction means corrects the bar width of the barcode image data in accordance with the inclination angle of the reading means when the reading means irradiates light with an inclination with respect to the barcode. Item 5. The barcode reader according to any one of Items 1 to 4. The detection means detects a movement state in which the reading means moves in the bar arrangement direction with respect to the barcode,
The correction means corrects the width of the start margin of the barcode image data according to the moving distance of the reading means when the reading means moves in the bar arrangement direction with respect to the barcode. The barcode reader according to any one of claims 1 to 5. The detection means detects a movement state in which the reading means is irradiated with light inclined with respect to the bar arrangement direction of the barcode,
When the reading unit irradiates light with an inclination with respect to the bar arrangement direction of the barcode, the correction unit determines the bar width of the barcode image data according to the inclination angle of the reading unit with respect to the bar arrangement direction. The barcode reader according to claim 1, wherein the barcode reader is corrected. Computer
Means for sequentially reading the barcode by the reading means together with the movement of the reading range with respect to the barcode, and obtaining barcode data;
Means for storing each acquired barcode data in a storage means;
Means for detecting a movement state of the reading means in a three-dimensional space;
Means for calculating a movement amount of the reading means necessary for synthesizing the barcode data based on the detected movement state;
Means for determining whether or not the reading means has moved by the calculated movement amount;
Means for synthesizing the barcode data acquired before the movement and the barcode data acquired after the movement when it is determined that the reading means has moved by the calculated movement amount ;
Means for decoding the synthesized barcode data;
Program to function as.

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