WO2012042726A1 - 画像読取装置、画像読取方法 - Google Patents
画像読取装置、画像読取方法 Download PDFInfo
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- WO2012042726A1 WO2012042726A1 PCT/JP2011/004504 JP2011004504W WO2012042726A1 WO 2012042726 A1 WO2012042726 A1 WO 2012042726A1 JP 2011004504 W JP2011004504 W JP 2011004504W WO 2012042726 A1 WO2012042726 A1 WO 2012042726A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/10—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using flat picture-bearing surfaces
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1335—Combining adjacent partial images (e.g. slices) to create a composite input or reference pattern; Tracking a sweeping finger movement
Definitions
- the present invention relates to an image reading apparatus and an image reading method for reading a surface image of a subject by photographing the subject from the back side of the detection table while rolling the subject on the surface of the detection table.
- the present invention relates to an apparatus and method suitable for reading.
- One method for identifying an individual is to use a fingerprint.
- a fingerprint image is input to the apparatus, and the input image is collated with a pre-registered fingerprint image. It is common.
- a method for inputting a fingerprint image a method is adopted in which a finger with ink attached is pressed against a paper surface to transfer the fingerprint, and then the paper surface with the fingerprint transferred is read by an image scanner. If a wide range of fingerprints including the side of the finger is required, the finger with ink attached is rotated so as to roll on the paper surface, and the fingerprint of the entire finger (rotated fingerprint) is transferred to the paper surface.
- the finger is soiled with ink or paper is required. Especially when the finger is rolled to transfer the fingerprint, the finger is not properly rolled on the paper surface. In each case, the ink attached to the finger is wiped off or a new paper is required.
- the above method has a problem that it takes time and labor as a whole because it is necessary to read the paper on which the fingerprint is transferred with an image scanner.
- the finger 83 is placed on the detection surface 82 of the triangular prism (optical prism) 81 and light is applied to the finger 83 from below by the light source 84.
- an image reading apparatus 80 that captures a rotating fingerprint image with a digital camera 85 equipped with a two-dimensional sensor such as a CCD (solid-state imaging device) has been proposed.
- the digital camera 85 is continuously driven at a frame rate of 30 fps to 60 fps, and during that time, the subject 83 rolls the finger 83 on the detection surface 82 and moves one side surface of the finger 83. The whole image from the other side to the other is taken as a movie. Thereafter, a plurality of frames of images obtained by moving image shooting are combined by the combining processing unit 86 to generate one still image. Thereby, the image data of the rotating fingerprint obtained by forming one image from one side surface of the finger 83 to the other side surface is acquired.
- the image reading device 80 since the image reading device 80 generates a single still image from a plurality of frames of images, if the finger 83 does not roll at a uniform speed during shooting, the joint between the images in the combined still image will be displayed. Distortion occurs. However, it is difficult to roll the finger 83 at a uniform speed, and it is necessary for the apparatus side to have a configuration in which distortion is corrected at the time of image synthesis or distortion is removed from the synthesized image. For this reason, an advanced image correction function becomes indispensable, and there is a problem that the circuit and software for signal processing become complicated and the apparatus becomes expensive.
- the present invention is for solving the above-described problems, and can reduce the size of the apparatus and can acquire a high-quality image with little distortion without using complicated signal processing.
- An object of the present invention is to provide an image reading apparatus capable of reducing the price.
- an image reading apparatus is an image reading apparatus that reads a surface image of a subject while rolling the subject in the sub-scanning direction, and the subject is placed on the surface. And a touch panel that outputs a pressing position pressed by the placed subject as coordinate information in the sub-scanning direction, and a subject placed on the touch panel in the main scanning direction from the back side of the touch panel.
- a line sensor that captures an image and outputs an image signal; a detecting unit that detects a movement amount of the pressed position of the subject on the touch panel in the sub-scanning direction based on coordinate information output from the touch panel; Sensor conveying means for moving the line sensor in the sub-scanning direction according to the movement of the subject based on the amount of movement detected by the detecting means. And wherein the door.
- An image reading method is an image reading method for reading a surface image of a subject while rolling the subject in the sub-scanning direction, and the pressing position pressed by the subject is the sub-scanning.
- the direction coordinate information is output, and based on the coordinate information, the amount of movement of the pressed position of the subject in the sub-scanning direction is detected, and the line sensor is caused to follow the rolling of the subject based on the amount of movement. Move in the sub-scanning direction.
- FIG. 1 is a perspective view showing an embodiment of an image reading apparatus according to the present invention.
- 1 is a top view showing an embodiment of an image reading apparatus according to the present invention. It is sectional drawing of an image reading apparatus.
- FIG. 3 is a plan view of the CCD of FIG. 2 (viewed in the direction of arrow A in FIG. 2).
- It is a block diagram which shows the function structure of an image reading apparatus.
- It is a figure which shows the structure of the coordinate detection means of FIG. 4, and a movement detection means.
- It is a figure which shows the detection method of a press position.
- It is a figure which shows the calculation method of the movement amount to a reading start position.
- 10 is a timing diagram illustrating a selection method for validation / invalidation of image data. It is a figure which shows the structure of an image selection means. It is a figure which shows the structure of a motor control means.
- 3 is a main flowchart showing an operation procedure of the image reading apparatus. 3 is a main flowchart showing an operation procedure of the image reading apparatus. 3 is a main flowchart showing an operation procedure of the image reading apparatus. It is a figure which shows the position correction of a reading unit, and is a figure which shows the state before correction
- FIG. 1A shows an embodiment of an image reading apparatus according to the present invention.
- the image reading apparatus 1 is housed in a scanner casing 2 and the scanner casing 2, and is driven by a motor.
- the reading unit 3 is configured to be movable in the sub-scanning direction, the transparent platen glass 4 disposed on the scanner housing 2, and the transparent touch panel 5 attached on the platen glass 4.
- a slide rail is mounted inside the scanner housing 2, and a gear that meshes with the slide rail and a motor that rotates the gear are mounted on the reading unit 3. .
- the touch panel 5 is formed in, for example, a rectangular shape in a top view, and is used as a mounting table on which the finger 6 is mounted as shown in FIG. As shown in FIG. 1B, the touch panel 5 outputs the position where the finger 6 is placed as coordinate information, with the short side direction (main scanning direction) as the Y coordinate and the long side direction (sub scanning direction) as the X coordinate.
- the touch panel 5 outputs the position where the finger 6 is placed as coordinate information, with the short side direction (main scanning direction) as the Y coordinate and the long side direction (sub scanning direction) as the X coordinate.
- a resistive film system an electrostatic capacitance system, an optical system etc. in the type of the touchscreen 5 any may be used.
- the platen glass 4 functions as a support base when the finger 6 is placed on the touch panel 5 and is made of transparent glass having higher strength than the touch panel 5.
- the reading unit 3 includes a light source 11 that irradiates light on the finger 6 placed on the touch panel 5, a CCD 12 that captures an image, and a fingerprint image of the finger 6 to the light receiving surface of the CCD 12.
- the mirror 13 and the optical lens 14, and the light source 11, the CCD 12, the mirror 13, and the unit housing 15 that accommodates the optical lens 14 are configured.
- the CCD 12 is a one-dimensional CCD (line sensor) that captures an image in units of one line, and is arranged to extend in the main scanning direction as shown in FIG. Note that the width (line width) LW of the light receiving surface of the CCD 12 is larger than the width of one scale of the X coordinate of the touch panel 5.
- FIG. 4 is a block diagram showing a functional configuration of the image reading apparatus 1.
- the image reading apparatus 1 detects the position of the finger 6 on the touch panel 5, and detects the movement amount of the finger 6 based on the detection result of the coordinate detection means 21.
- a movement detection means 22 for outputting a detection signal DS, a light source 11, a CCD 12, and a CCD driver 23 for supplying an image output signal ⁇ TG to drive the CCD 12 and periodically outputting an image signal (analog signal) IS from the CCD 12.
- the CCD driver 23 is instructed and the light receiving unit 24 is turned on, and the image signal IS output from the CCD 12 is A / D converted.
- the image selecting means 26 for selecting the image data (digital signal) ID output from the image signal processing section 25 into the effective image data and the invalid image data, and the memory 27 for storing the effective image data output from the image selecting means 26.
- a stepping motor (hereinafter referred to as “motor”) 28 for moving the reading unit 3 (see FIGS. 1A and 1B) in the sub-scanning direction, motor control means 29 for controlling the motor 28, and the like.
- the coordinate detection unit 21 detects whether or not the finger 6 is placed on the touch panel 5 according to the output of the touch panel 5, and outputs a touch detection signal TD. , (in the region where the finger 6 presses the touch panel 5, a signal indicating the area of the X-coordinate direction) X coordinate signal output from the touch panel 5 X coordinate data and a / D conversion to generate the X-coordinate data X D And a generation unit 32.
- the movement detection unit 22 includes an initial position detection unit 41, a start position calculation unit 42, a current position detection unit 43, a movement amount detection unit 44, and a reverse detection unit 45.
- the initial position detection unit 41 is the position where the finger 6 first pressed the touch panel 5 (the subject is the first And the initial position data X 0 indicating the X coordinate data of the detected position is output.
- the pressing range of the finger 6 in the sub-scanning direction (X coordinate direction) is much larger than the width of one scale of the X coordinate of the touch panel 5, so the X coordinate data generation unit 32.
- the X coordinate data X D given to the initial position detection unit 41 is a value for a plurality of scales from the left end X coordinate data X D1 to the right end X coordinate data X D2 .
- the initial position detector 41 subtracts a predetermined amount r from the X coordinate data X D2 toward the inside of the finger 6 or adds a predetermined amount r from the X coordinate data X D1 toward the inside of the finger 6. correcting the coordinate values, the initial position data X 0 certifies this corrected value as the pressing position of the finger 6.
- the correction function is not necessarily installed in the initial position detection unit 41, and may be installed in the X coordinate data generation unit 32 of the coordinate detection means 21.
- the coordinate information is narrowed down to one point and output from the beginning according to the specification on the touch panel 5 side (for example, an intermediate value between the left end X coordinate and the right end X coordinate is output)
- the above-described coordinate correction is not necessary.
- the start position calculation unit 42 calculates the movement amount M from the home position to the reading start position of the reading unit 3 based on the initial position data X 0 of the initial position detection unit 41.
- An initial drive value MV indicating the movement amount is output.
- the start position calculation unit 42 stores in advance information on how many scales of the X coordinate of the touch panel 5 correspond to the line width LW of the CCD 12.
- the current position detection unit 43 outputs current position X coordinate data X i indicating the current pressed position of the finger 6 based on the X coordinate data X D of the X coordinate data generation unit 32. Also in the current position detection unit 43, as in the case of the initial position detection unit 41 shown in FIG. 6, the coordinate value is corrected by subtracting a predetermined amount r from the X coordinate data X D1 or X D2 in the direction toward the inside of the finger 6. Then, this corrected value is recognized as the pressed position of the finger 6 and used as the current position X coordinate data X i .
- the detection cycle of the current position X coordinate data X i is set to a constant cycle and shorter than the image signal output cycle VT of the CCD 12 (see FIG. 9).
- the movement amount detection unit 44 determines whether or not the movement amount of the pressed position of the finger 6 reaches the line width LW (see FIG. 3) of the CCD 12.
- the movement detection signal DS is output.
- the movement amount detection unit 44 holds X coordinate data X m when a movement detection signal DS described later is started, and the held X coordinate data X m is used as current position X coordinate data.
- a movement amount (X i ⁇ X m ) of the finger 6 is obtained by subtracting from X i . Then, it is determined whether or not the obtained movement amount (X i ⁇ X m ) has reached a length corresponding to the line width LW of the CCD 12, and if it has reached, a movement detection signal is obtained as shown in FIG. Raise DS to Hi level.
- the movement amount detection unit 44 also stores in advance how many scales of the X coordinate of the touch panel 5 correspond to the line width LW of the CCD 12.
- the movement amount detection unit 44 determines the movement direction of the finger 6 (whether it is normal rotation or reverse rotation in the sub-scanning direction) and outputs a direction signal RD indicating the movement direction.
- the direction signal RD is at the Hi level when the movement direction of the finger 6 is the normal rotation direction, and is at the Low level when the movement direction of the finger 6 is the reverse rotation direction.
- the movement direction of the finger 6 can be determined using the obtained movement amount (X i ⁇ X m ). If the movement amount (X i ⁇ X m ) is a positive value, it is determined as normal rotation. If the value is negative, it is determined that the rotation is reverse.
- the inversion detection unit 45 is provided to control the operation when the moving direction of the finger 6 is inverted.
- a value indicating the reverse movement amount of the finger 6 (a value obtained by converting the movement amount in the reverse direction into the number of lines). ) L is managed, and the reverse return signal BS is generated based on the reverse movement amount L.
- the reverse return signal BS is reversed from the period in which the finger 6 is moving in the reverse direction (reverse period) and from the state in which the finger 6 is moved in the reverse direction, and the reverse start position (the rolling direction of the finger 6 is reversed from the normal rotation).
- 9 is a signal indicating a period (return period) until the finger 6 starts reversing from normal rotation to reverse rotation and returns to the original position as shown in FIG. During this period, it rises to Hi level.
- the image selection means 26 receives the movement detection signal DS from the movement detection means 22, the inversion return signal BS, and the image output signal ⁇ TG from the CCD driver 23, and receives the image selection signal.
- a sorting unit 51 that outputs SS, and a gate unit 52 that sorts the image data ID into valid image data and image data that is not based on the image selection signal SS of the sorting unit 51 are provided.
- the selection unit 51 refers to the movement detection signal DS and the image output signal ⁇ TG during the period in which the inversion return signal BS is at the low level, and the image immediately after the movement detection signal DS rises to the Hi level.
- the image selection signal SS is raised to the Hi level and held for a period of one cycle of the image signal output cycle VT of the CCD 12.
- the Hi level period of the image selection signal SS corresponds to a period in which the image data ID is converted into an effective image
- the Low level period of the image selection signal SS corresponds to a period in which the image data ID is converted into an invalid image.
- the image selection signal SS is held at the low level regardless of the movement detection signal DS and the image output signal ⁇ TG during the period in which the reverse recovery signal BS is at the Hi level.
- the gate unit 52 outputs the image data ID output from the image signal processing unit 25 as a valid image to the subsequent memory 27 during the period in which the image selection signal SS is at the Hi level, while the image selection signal SS is at the Low level. In the period, the image data ID is discarded as an invalid image.
- the gate part 52 can be comprised by AND circuit, for example.
- the motor control means 29, as shown in FIG. 11, reads the motor driver 61 that drives the motor 28 in response to the movement detection signal DS from the movement detection means 22 and the CCD 12 (reading unit 3). And a start position control unit 62 that controls movement to the start position.
- the motor driver 61 drives the motor 28 to move the CCD 12 (reading unit 3) in the sub-scanning direction by the line width LW when the movement detection signal DS of the movement amount detection unit 44 rises to the Hi level. Further, when the direction signal RD of the movement amount detection unit 44 indicates the forward direction, the motor driver 61 rotates the motor 28 in the forward direction (the rotational direction that moves the CCD 12 in the forward direction), and when the direction signal RD indicates the reverse direction. Then, the motor 28 is rotated in the reverse direction.
- the start position control unit 62 is used when the CCD 12 is moved from the home position to the reading start position (see FIG. 7).
- the initial drive value MV (see FIG. 5) from the movement detection means 22 and the motor drive amount are used.
- an instruction is given to the motor driver 61 to drive the motor 28 until the two match.
- step S3 the driving of the CCD 12 is started (step S3), and the process waits for the finger 6 to be placed on the touch panel 5 (step S4). Then, when the finger 6 is placed on the touch panel 5 and the touch detection unit 31 (see FIG. 5) detects that fact, the initial position detection unit 41 sets the initial position of the finger 6 in response to this.
- Initial position data X 0 is generated (step S5).
- the movement amount M (see FIG. 7) from the home position to the reading start position of the reading unit 3 is calculated by the start position calculation unit 42 (see FIG. 5), and the start position control unit 62 (see FIG. 11).
- the reading unit 3 is moved to the reading start position (step S6).
- the home position depends on the arrangement position of the mirror 13 and the optical lens 14.
- the reading unit 3 is moved from the reading start position to the reading start position, the reading unit 3 is positioned in a state in which a deviation occurs between the optical axis 16 of the mirror 13 and the optical lens 14 and the initial position X 0 of the finger 6.
- the correction process described above is not necessary when a configuration is adopted in which no deviation occurs from the beginning, for example, when the position reference P of the reading unit is set to be aligned with the optical axis 16.
- the current position X coordinate data X i indicating the current pressed position of the finger 6 is detected by the current position detecting unit 43 (see FIG. 5). Is generated (step 8).
- the detection cycle of the current position X coordinate data X i is a constant cycle and a cycle shorter than the image signal output cycle (output cycle of the image signal IS) VT (see FIG. 9) of the CCD 12.
- the movement amount detector 44 calculates the movement amount (X i ⁇ X m ) of the finger 6 and generates a direction signal RD indicating the movement direction of the finger 6 (step S9).
- step S11: Y When the movement amount (X i ⁇ X m ) of the finger 6 is equal to or larger than the line width LW (when the movement detection signal DS rises to the Hi level) (step S11: Y), the pressing position of the finger 6 is In order to indicate that the line has moved more than the line width LW in the forward direction, the motor 28 is driven by the motor driver 61 (see FIG. 11), and the CCD 12 (reading unit 3) is moved in the forward direction by a distance corresponding to the line width LW. (Step S12). Thus, as shown in FIG. 15A, the CCD 12 is moved in the forward direction line by line while following the movement of the finger 6.
- step S13 is provided at the next stage of step S12. However, this will be described later with the description omitted for convenience.
- the selection unit 51 raises the image selection signal SS to the Hi level and validates the image data ID output from the image signal processing unit 25 (step S14).
- the rise of the image selection signal SS is performed in response to the rise of the image output signal ⁇ TG immediately after the movement detection signal DS rises to the Hi level, and the Hi level period of the image selection signal SS is , And held for a period of one cycle of the image signal output cycle VT of the CCD 12 (see FIG. 9).
- the image data ID for one line is validated, and the validated image data ID is output to the memory 27 through the gate unit 52 (see FIG. 10).
- step S11 when the movement amount (X i ⁇ X m ) of the finger 6 is less than the line width LW (when the movement detection signal DS has not risen) (step S11: N), in the selection unit 51, the image data ID Is maintained (state in which the image selection signal SS is lowered to the Low level) (step S15).
- step S10 N
- the selection unit 51 maintains the invalidated state of the image data ID (step S10).
- step S16) it is determined whether or not the absolute value of the movement amount (X i ⁇ X m ) of the finger 6 is equal to or larger than the line width LW (step S17).
- step S8 When the absolute value of the movement amount (X i -X m ) of the finger 6 is smaller than the line width LW (N in step S17), the process proceeds to step S8, and the detection timing of the next current position X coordinate data X i In response to the arrival of the process, the processes after step S8 are executed.
- step S17 when the absolute value of the movement amount (X i ⁇ X m ) of the finger 6 is greater than or equal to the line width LW (step S17: Y), it is confirmed that the pressed position of the finger 6 has moved more than the line width LW in the reverse direction.
- the reversal detection unit 45 adds one line to the reverse movement amount L (step S18). Further, the motor 28 is rotated in the reverse direction, and the CCD 12 is moved in the reverse direction by a distance corresponding to the line width LW (step S19).
- step S10 it is determined whether or not the moving direction of the finger 6 is the forward rotation direction. To do.
- step S10: N if the movement of the finger 6 in the reverse direction is continued (step S10: N), the process proceeds to step S16 again, and the processes of steps S16 to S19 are repeated. Therefore, every time the absolute value of the movement amount (X i ⁇ X m ) becomes equal to or larger than the line width LW, “1” is cumulatively added to the reverse movement amount L, and the movement of the finger 6 as shown in FIG. 15B. Following this, the CCD 12 is moved in the reverse direction line by line.
- step S10 determines whether the movement direction of the finger 6 has changed to the normal rotation direction in the process of step S10 (step S10: Y). If the movement direction of the finger 6 has changed to the normal rotation direction in the process of step S10 (step S10: Y), the process proceeds to step S11, and the movement amount of the finger 6 (X i -X It is determined whether m ) is equal to or larger than the line width LW. If the amount of movement of the finger 6 in the forward direction (the amount of movement in the direction to return to the inversion start position) is equal to or greater than the line width LW (step S11: Y), the motor 28 is rotated forward and the CCD 12 is moved. The line is returned to the normal rotation direction by one line (step S12).
- step S13 it is determined whether or not the reverse movement amount L of the reverse detection unit 45 is “0” (step S13). This process is for confirming whether the CCD 12 has returned to the reversal start position of the finger 6, and when the reverse movement amount L is not 0 (step S13: N), that is, when it has not yet returned to the reversal start position.
- step S21 “1” is subtracted from the reverse movement amount L held by the reverse detection unit 45 while maintaining invalidation of the image data ID (step S20). The subtraction of “1” from the reverse movement amount L corresponds to the fact that the CCD 12 is returned to the normal rotation direction by one line in step S12.
- step S13 Y
- step S14 the image data ID is changed in the same manner as described above.
- the CCD 12 is intermittently moved in the positive direction line by line while being appropriately validated.
- steps S8 to S20 are performed until the finger 6 is removed from the touch panel 5 or the number of acquired lines of the image data ID reaches the number of effective image designated lines (steps S22 and S23).
- a rotated fingerprint image from one side surface of the finger 6 to the other side surface is obtained line by line.
- the number of effective image designation lines is set in advance in consideration of the approximate size of the rotated fingerprint image of all people, and is converted into a numerical value by converting the estimated size of the rotated fingerprint image into the number of lines of the CCD 12. It is a thing.
- step S22: Y, S23: Y If the finger 6 is removed from the touch panel 5 or the number of acquisition lines of the image data ID has reached the number of effective image designation lines (step S22: Y, S23: Y), the reading operation is terminated, and FIG. As shown in FIG. 4, the CCD 12 is returned to the home position and the drive of the CCD 12 is stopped (steps S24 and S25).
- the rolling speed of the finger 6 was slow, from the rise of the movement detection signal DS is at the timing t 1, followed by a state that does not rise for a while movement detection signal DS.
- the image selection signal SS rises to validate the image data ID (A).
- the motor drive signal rises and the CCD 12 is moved by one line in the forward rotation direction.
- the image selection signal SS falls and transition is made to invalidate the image data ID (timing t 3 ). Thereafter, the invalidation of the image data ID is continued until the next rising edge of the image selection signal SS (timing t 5 ), and all the image data ID (B) and ID (C) output during that time are discarded.
- the image data ID (D) is validated and the motor is driven in the same manner as described above.
- the timing t 4 later, so movement detection signal DS rises in a short period.
- the frequency of validating the image data ID increases, and the image data ID (E) next to the image data ID (D) is also validated.
- the image signal IS is periodically output from the CCD 12 in units of one line, the amount of movement of the pressed position of the finger 6 is detected, and the finger 6 is caused to follow the rolling. Since the CCD 12 is configured to move, and each time the amount of movement of the pressing position of the finger 6 reaches the line width LW, the image data ID is selectively validated. It is possible to obtain fingerprint images in order line by line while avoiding duplication). Then, since the entire image of the rotated fingerprint is generated by connecting a plurality of image data IDs obtained in units of lines as described above, distortion is generated at the joints of the images as compared with the case where the frame images (area images) are combined. Therefore, it is possible to obtain a high-quality image with little distortion without using a conventional distortion correction process.
- the direction signal RD rises to the Hi level and operates in the same manner as at timings t 1 to t 3 in FIG.
- the reverse return signal BS rises to the Hi level.
- the reverse return signal BS is maintained in a Hi level state until timing t 30 when the finger 6 is reversed again and returned to the reverse start position (position where the rolling direction of the finger 6 has changed from normal rotation to reverse rotation). . For this reason, all the image data ID (C) to ID (H) output between timings t 24 and t 30 are invalidated and discarded.
- the motor drive signal rises (timing t 26 ), the motor 28 is driven in reverse rotation, and the CCD 12 is moved in the reverse direction.
- the direction signal RD rises to the Hi level.
- the motor drive signal rises (timing t 29 )
- the motor 28 is driven to rotate forward, and the CCD 12 is moved in the forward direction.
- the timing t 30 Thereafter came back fingers 6 to the reversing start position, as in the case of FIG. 16, in accordance with the progress of the finger 6, with sorting enable / disable the image data ID, as appropriate, the CCD12 The reading operation is advanced while moving in the forward direction.
- the timing at which the rolling direction of the finger 6 is reversed and the timing at which the finger 6 is re-inverted and returns to the inversion start position are detected. Since all the IDs are invalidated, the image data IDs during the period in which the subject did not roll the finger 6 correctly can be discarded appropriately. For this reason, the image data ID in such a period is not mixed in the joined image, and it is possible to avoid the disordered image after joining. Thereby, even when the subject changes the rolling direction of the finger 6 during the reading, the reading is not forced again, and the convenience can be improved.
- the CCD 12 is configured to move following the rolling of the finger 6 while reading the fingerprint image in units of lines by the CCD 12 having a one-dimensional configuration (line sensor). Since the tracking type scanner structure is employed in the reading unit for generating the image signal of the fingerprint image, it is not necessary to mount a structurally large digital camera in the apparatus, and the entire apparatus can be reduced in size.
- the image data ID is selectively validated every time the movement amount of the pressed position of the finger 6 reaches the line width LW, it is possible to use the conventional distortion correction process without using the distortion correction process. A high-quality image with little distortion can be acquired. For this reason, it is possible to eliminate the complexity of signal processing circuits and software, and to reduce the cost of the apparatus.
- an object to be read is not limited to a finger and can be transferred on the touch panel 5. Any moving subject can be used. That is, the present invention can be widely applied as long as it rolls on the touch panel 5 to read a surface image, and can be applied to, for example, surface inspection of beverage or food cans. .
- the subject is preferably a cylindrical object, but there is no problem as long as it can roll on the touch panel 5 even if it has a somewhat distorted shape.
- the CCD 12 when the rolling direction of the finger 6 is reversed, the CCD 12 is moved following the movement (see FIG. 15B), but FIG. 18A, FIG. 18B and FIG. As shown in FIG. 4, even if the finger 6 rolls in the reverse direction, the CCD 12 is stopped at the reverse start position of the finger 6 without moving in the reverse direction, and then the finger 6 is re-inverted and returned to the reverse start position. You may make it wait until it comes. After the finger 6 has returned to the inversion start position, the CCD 12 is moved in the positive direction following the movement of the pressing position of the finger 6 as in the case of FIG.
- the X-coordinate data X m when launched movement detection signal DS which determine the movement amount is subtracted from the current position X-coordinate data X i of the current (X i -X m), determines whether the movement amount obtained (X i -X m) is equal to or greater than the line width LW
- the X coordinate data X i1 to X i6 for each detection period DT are cumulatively added to obtain the movement amount X add , and the movement amount X add corresponds to the line width LW. You may make it determine whether it becomes more than the length to do. In this case, the movement amount X add is reset to “0” every time the movement detection signal DS rises.
- the pressing position of the finger 6 is recognized, the pressing position is recognized by uniformly adding and subtracting the predetermined amount r (see FIG. 6). 41.
- the current position detection unit 43 performs a calculation process of X D1 + ⁇ (X D2 -X D1 ) / 2 ⁇ or X D2 - ⁇ (X D2 -X D1 ) / 2 ⁇ . calculated central coordinates of D1 and X coordinate data X D2, which may be recognized as the pressing position.
- the CCD is exemplified as the line sensor that outputs the image signal IS.
- the CCD it is not always necessary to use the CCD, and other imaging elements such as a CMOS sensor may be used.
- the image selection unit that selectively enables the image signal output from the line sensor, and the image selection unit that enables the image signal Storage means for storing the processed image signal.
- the detection unit periodically refers to coordinate information output from the touch panel, and the amount of movement of the pressed position of the subject in the sub-scanning direction is the line width of the line sensor.
- a movement amount detection unit that detects that the length corresponding to the length of the subject has been reached, and the image selection means has a length in which the movement amount of the pressing position of the subject in the sub-scanning direction corresponds to the line width of the line sensor. The image signal output from the line sensor can be validated.
- fingerprint images can be obtained sequentially in line units while avoiding overlapping images. Then, if a whole image is generated by connecting a plurality of image signals in units of lines obtained in this way, distortion is less likely to occur at the joint of the image than when combining frame images (area images). A high-quality image with less distortion can be acquired without using a conventional distortion correction process.
- the sensor transport unit drives the motor based on the detection result of the motor that transports the line sensor in the sub-scanning direction and the movement amount detection unit, and the line sensor And a motor driver that conveys each line.
- the line sensor can be moved in line units in accordance with the rolling of the subject, and the position of the line sensor can be appropriately changed by following the rolling of the subject.
- the detection unit is detected by the movement direction detection unit that detects the rolling direction of the subject based on the coordinate information output from the touch panel, and the movement direction detection unit. On the basis of the rolling direction and the coordinate information output from the touch panel, and the reversal period in which the rolling direction of the subject is reversed, and until the subject returns to the original position in the subsequent re-inversion.
- An inversion detection unit for detecting a return period, and the image selection unit invalidates all image signals output from the line sensor in a period in which the inversion detection unit detects the inversion period or the return period.
- the line sensor is based on the amount of movement detected by the detection means during a period in which the inversion detection unit detects neither the inversion period nor the return period. Can be selectively enabled image signals al outputted.
- an inversion period in which the rolling direction of the subject is inverted, and a return period in which the subject returns to the original position by subsequent reinversion are detected. Since the image signal is invalidated, an image signal generated during a period in which the subject is not correctly rolled can be appropriately discarded, and it is possible to avoid the disordered image after joining.
- the line sensor periodically outputs the image signal
- the image selection unit periodically receives the movement from the line sensor based on the amount of movement detected by the detection unit.
- the output image signal can be selectively validated in synchronization with the image signal output cycle of the line sensor.
- the line sensor is continuously driven at a constant period, and necessary output is appropriately extracted from the output image signal. Therefore, the drive timing of the line sensor is controlled in a complicated manner (for example, subject Therefore, it is not necessary to drive the line sensor only when necessary while monitoring the amount of movement, and it is possible to avoid complication of the control sequence. Further, since it is possible to switch the validation / invalidation of the image signal in accordance with the signal output timing of the line sensor, it is possible to obtain an appropriate image signal when the image signal is validated.
- the subject can be a finger
- the surface image can be a rotated fingerprint image from one side surface to the other side surface of the finger.
- the present invention can be used in a system for collating fingerprints.
Abstract
Description
2 スキャナ筐体
3 読取ユニット
4 プラテンガラス
5 タッチパネル
6 指
11 光源
12 CCD
13 ミラー
14 光学レンズ
15 ユニット筐体
21 座標検出手段
22 移動検出手段
23 CCDドライバ
24 コマンド受信部
25 画像信号処理部
26 画像選別手段
27 メモリ
28 モータ
29 モータ制御手段
31 タッチ検出部
32 X座標データ生成部
41 初期位置検出部
42 開始位置算出部
43 現在位置検出部
44 移動量検出部
45 反転検出部
51 選別部
52 ゲート部
61 モータドライバ
62 開始位置制御部
TD タッチ検出信号
X D X座標データ
RD 方向信号
DS 移動検出信号
BS 反転復帰信号
SS 画像選択信号
φTG 画像出力信号
IS 画像信号
ID 画像データ
MV 初期駆動値
Claims (8)
- 被写体を副走査方向に転動させながら該被写体の表面像を読み取る画像読取装置であって、
表面に前記被写体が載置されるとともに、該載置された被写体によって押圧される押圧位置を前記副走査方向の座標情報で出力するタッチパネルと、
該タッチパネル上に載置された被写体を該タッチパネルの裏面側から主走査方向に撮影し、画像信号を出力するラインセンサと、
前記タッチパネルから出力される座標情報に基づき、該タッチパネル上での前記被写体の押圧位置の前記副走査方向への移動量を検出する検出手段と、
該検出手段で検出される移動量に基づき、前記被写体の転動に追従させて前記ラインセンサを前記副走査方向に移動させるセンサ搬送手段とを備えることを特徴とする画像読取装置。 - 前記検出手段で検出される移動量に基づき、前記ラインセンサから出力される画像信号を選択的に有効化する画像選別手段と、
該画像選別手段で有効化された画像信号を記憶する記憶手段とを備えることを特徴とする請求項1に記載の画像読取装置。 - 前記検出手段は、前記タッチパネルから出力される座標情報を定期的に参照し、前記被写体の押圧位置の副走査方向への移動量が前記ラインセンサのライン幅に相当する長さに達したことを検出する移動量検出部を備え、
前記画像選別手段は、前記被写体の押圧位置の副走査方向への移動量が前記ラインセンサのライン幅に相当する長さに達したときに、前記ラインセンサから出力される画像信号を有効化することを特徴とする請求項2に記載の画像読取装置。 - 前記センサ搬送手段は、前記ラインセンサを前記副走査方向に搬送するモータと、前記移動量検出部の検出結果に基づいて該モータを駆動し、前記ラインセンサをライン単位で搬送させるモータドライバとを備えることを特徴とする請求項3に記載の画像読取装置。
- 前記検出手段は、前記タッチパネルから出力される座標情報に基づいて、前記被写体の転動方向を検出する移動方向検出部と、該移動方向検出部によって検出される転動方向及び前記タッチパネルから出力される座標情報に基づいて、前記被写体の転動方向が反転している反転期間、及び、その後の再反転で該被写体が元の位置に戻ってくるまでの復帰期間を検出する反転検出部とを備え、
前記画像選別手段は、前記反転検出部が前記反転期間又は前記復帰期間を検出する期間において、前記ラインセンサから出力される全ての画像信号を無効化し、前記反転検出部が前記反転期間及び前記復帰期間のいずれも検出しない期間において、前記検出手段で検出される移動量に基づき、前記ラインセンサから出力される画像信号を選択的に有効化することを特徴とする請求項2、3又は4に記載の画像読取装置。 - 前記ラインセンサは、前記画像信号を定期的に出力し、
前記画像選別手段は、前記検出手段で検出される移動量に基づき、前記ラインセンサから定期的に出力される画像信号を、該ラインセンサの画像信号出力周期に同期して選択的に有効化することを特徴とする請求項2乃至5のいずれかに記載の画像読取装置。 - 前記被写体が指であり、前記表面像が該指の一方の側面から他方の側面までの回転指紋像であることを特徴とする請求項1乃至6のいずれかに記載の画像読取装置。
- 被写体を副走査方向に転動させながら該被写体の表面像を読み取る画像読取方法であって、
前記被写体によって押圧される押圧位置を前記副走査方向の座標情報で出力し、
前記座標情報に基づき、前記被写体の押圧位置の前記副走査方向への移動量を検出し、
前記移動量に基づき、前記被写体の転動に追従させてラインセンサを前記副走査方向に移動させる画像読取方法。
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US13/824,866 US8854702B2 (en) | 2010-09-28 | 2011-08-09 | Image reading apparatus and image reading method |
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WO2015166393A1 (en) * | 2014-04-28 | 2015-11-05 | Green Bit S.P.A. | Method and device for detecting moving objects such as fingerprints and corresponding computer program product |
JP6756456B2 (ja) * | 2017-07-25 | 2020-09-16 | 日本電信電話株式会社 | パケット廃棄システム及び方法 |
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