JP2013217662A - Length measuring device, length measuring method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a length measuring device that obtains a length of an object in real time through a simple operation.SOLUTION: The length measuring device includes an image processing part that performs image processing on image information captured by an imaging part. The image processing part includes: a distance calculation part that calculates distance information from the image information captured by the imaging part; and a length calculation part that corrects coordinates of at least two reference points to be used for length measurement, on the basis of position dependency of the distance information, to calculate the length between at least the two corrected reference points.

Description

  The present invention relates to an apparatus for measuring the length of a subject using image information captured by an imaging unit.

  There is a method of acquiring three-dimensional information by simultaneously imaging the same subject using a plurality of cameras and obtaining a correspondence between the acquired images. Among them, as in Patent Document 1 and Patent Document 2 below, a technique for measuring the position and length of a subject reflected in a captured image is known.

  In the technique described in Patent Document 1, a stereo camera having two imaging units is used, two images having parallax on the left and right are acquired, and one of the left and right images captured by the stereo camera is displayed on a liquid crystal display. A live view is displayed on a monitor such as a device, and two arbitrary points in the image are designated to measure the length between two points of the subject reflected at that position.

  In the technique described in Patent Document 2, two images having parallax are acquired using two optical systems mounted at the distal end of the endoscope apparatus, and the user moves the cursor on the monitor and designates the first point. After that, the cursor is moved on the image, the length between the specified first position and the current cursor position is measured, and the updated value is always displayed, and the position and length of the subject are changed. Measuring.

JP 2011-232330 A JP 2009-258273 A

  However, in the method described in Patent Document 1, it is necessary for the user to designate two points by operating the monitor with a touch panel or moving the cursor, so each time the measurement position is changed, It takes time to specify two points again. Furthermore, when the monitor that displays the captured image is small, the subject is displayed small, and it is difficult for the user to specify a fine point. In addition, when a point is designated by a touch panel, there is a problem that the user's own finger obstructs the field of view and makes the point designation difficult.

  According to the method described in Patent Literature 2, the burden of designating the second point by the user is reduced, and the measurement value at that moment can always be confirmed, so that the user's measurement work is facilitated. However, since an operation for specifying at least one point occurs, there is a problem that the burden on the user cannot be reduced sufficiently.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a length measuring device capable of knowing the length of a subject in real time by a simple operation.

  According to an aspect of the present invention, there is provided a length measuring device including an image processing unit that performs image processing on image information captured by an imaging unit, wherein the image processing unit is an image captured by the imaging unit. A distance calculation unit that calculates distance information from the information, and coordinates of at least two reference points used as a reference when calculating the length based on the position dependency of the distance information, and between the corrected at least two reference points There is provided a length measuring device including a length calculating unit that calculates a length.

  Furthermore, a display unit that displays image information image-processed by the image processing unit, and a display control unit that outputs an image captured by the imaging unit and a calculation result of the length to the display unit. It is preferable. The output may be performed separately on an external monitor.

  Furthermore, it has a ranging part, The said distance calculation part calculates distance by the said ranging part, It is characterized by the above-mentioned.

  The length calculation unit can correct the coordinates of the at least two reference points with respect to the positional relationship of the subject imaged by the imaging unit in accordance with the positional relationship of the designated subject.

  For example, distance information is calculated from image information captured by at least two imaging units, the positional relationship of the subject is grasped based on the distance information, and the positions of at least two reference points used as a reference when calculating the length are determined. Correction is made based on the positional relationship, and the length between the corrected reference points can be calculated.

  The imaging unit may be configured by a single imaging unit, and the imaging unit may be configured to include at least two imaging units of first and second. That is, there may be one imaging unit or two or more imaging units.

  When there are two or more image capturing units, distance information is calculated from image information captured by at least two image capturing units, the positional relationship of the subject is grasped based on the distance information, and at least 2 as a reference for length calculation The positions of the two reference points can be corrected based on the positional relationship of the subject, and the length between the corrected reference points can be calculated.

  The length calculation unit includes a feature point detection unit that detects a feature point from the image acquired by the imaging unit, and a reference point candidate detection unit that detects a reference point candidate for a position to be measured from the detected feature point. A length measurement mode determination unit that determines a length measurement target and a length measurement unit that calculates a length between reference points can be included.

  The display control unit may superimpose and output a shooting guide to assist at the time of length measurement on at least one of the images shot by the imaging unit.

  It is convenient if the area near the photographing guide can be enlarged and displayed on a part of the display unit.

  According to another aspect of the present invention, there is an image processing step for performing image processing on captured image information, and the image processing step includes a distance calculation step for calculating distance information from the captured image information, A length calculation step of correcting the coordinates of at least two reference points used as a reference when calculating the length based on the position dependency of the distance information, and calculating a length between the corrected at least two reference points. A length measurement method is provided.

  It is preferable to include a display control step of outputting the captured image and the length calculation result to a display unit.

  The present invention may be a program for causing a computer to execute the length measuring method described above, or a computer-readable recording medium for recording the program.

  According to the length measuring device according to the present invention, it is possible to know the length of the subject in real time by a simple operation with less burden on the user.

(A) is a block diagram which shows one structural example of the length measuring apparatus in the 1st and 2nd embodiment of this invention, (B) is a functional block diagram which shows one structural example of the length calculation part. It is. It is a figure which shows the example of a use environment of the length measuring apparatus by this Embodiment. It is an external appearance block diagram which shows one structural example at the time of implement | achieving the length measuring apparatus by this Embodiment with an information terminal. It is a figure which shows the example of a setting of an imaging | photography guide. It is a flowchart figure which shows the flow of a length measurement process. It is a flowchart figure which shows the flow of a length calculation process. It is a figure which shows the example of the length measurement environment of object length measurement mode, and the relationship between a picked-up image and distance. It is a figure which shows the example of the length measurement environment of an interval length measurement mode, and the relationship between a picked-up image and distance. It is a figure which shows the example of a reference range setting at the time of length measurement mode determination. It is a flowchart figure which shows the flow of the length measurement process in the 2nd Embodiment of this invention. It is a functional block diagram which shows the example of 1 structure of the length measuring apparatus in the 3rd Embodiment of this invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1A is a functional block diagram illustrating a hardware configuration example of the length measuring apparatus according to the present embodiment. The length measuring device 1 according to the first embodiment includes output images of a first imaging unit 10 and a second imaging unit 11 that image a subject to be measured, and first and second imaging units 10 and 11. An image processing unit 12 that performs image processing based on the image processing unit 12 and a display unit 13 that displays output information of the image processing unit 12 are provided.

  The image processing unit 12 includes a distance calculation unit 14 that calculates distance information from the first and second imaging units 10 and 11 to the subject, a length calculation unit 15 that calculates the length of the captured subject, and a display. And a display control unit 16 for controlling information.

  The length measuring device in the present embodiment includes, for example, a processor such as a CPU (Central Processing Unit), a main storage device such as a RAM (Random Access Memory), etc., and executes a program stored in the storage device to The processing of each processing unit can be realized. Alternatively, by providing a programmable integrated circuit such as an FPGA (Field Programmable Gate Array) or an integrated circuit dedicated to the above processing, the above processing can be realized by hardware.

  The first imaging unit 10 and the second imaging unit 11 capture an object and output an image. The received light is converted into an electrical signal and used as an image (CCD (Charge Coupled Device), CMOS (Complementary Metal Oxide Semiconductor). And an optical system such as a lens for condensing light from the subject on the image sensor.

  The display unit 13 is a display that uses, for example, a liquid crystal element or an organic EL (Electro Luminescence) as a pixel.

Next, a usage example of the length measuring device 1 will be described with reference to FIGS. 2 and 3.
FIG. 2 is an example of use when the length measuring device according to the present invention is realized by an information terminal such as a mobile phone or a smartphone. The subject 20 is photographed from the front by the length measuring device 1, the length of the subject 20, Here, for example, the state of measuring the height of a person is shown. FIG. 3 shows an outline of the external configuration of the length measuring apparatus 1 shown in FIG. 2 and 3, the same components as those in the block diagram of FIG. 1 are denoted by the same reference numerals.

  FIG. 3A shows a rear view of the length measuring device 1, in which two imaging units, the first and second imaging units 10 and 11, are mounted in a stereo arrangement. The stereo arrangement refers to an arrangement in which the optical axes of the two imaging units are arranged in parallel. In the present embodiment, the two imaging units 10 and 11 having the same configuration are used as an example. However, if the two imaging units can capture the same region and take correspondence between pixels, resolution and Imaging units having different configurations such as an angle of view may be used.

  In FIG. 3A, the two image pickup units are shown as being vertically arranged in the vertical direction, but may be arranged horizontally in the horizontal direction, and the image pickup apparatus shown in the figure can be used while being inclined horizontally.

  FIG. 3B shows a front view of the length measuring device 1. For example, the video of the imaging units 10 and 11 is displayed as a live view on the display unit 13 which is a liquid crystal display. In FIG. 3B, an image of photographing the subject 20 is displayed. In the present embodiment, the first imaging unit 10 is used as a reference and the video is displayed on the display unit 13. However, the reference imaging unit may be either the first imaging unit 10 or the second imaging unit 11. Good.

  The display unit 13 displays an image obtained by superimposing the shooting guide frame 30 and the shooting guide frame 31 on the image of the first imaging unit 10. The shooting guide frames 30 and 31 may be set in advance and stored in a storage device (not shown). The photographing guide frames 30 and 31 are always displayed at the same image coordinate position on the screen of the display unit 13. That is, even when the subject or the length measuring device moves, the positions of the photographing guide frames 30 and 31 do not change. In FIG. 3B, the rectangular guide frames 30 and 31 are set to be arranged in the vertical direction as an example, but the shape and arrangement method of the photographing guide frame are not limited to this.

  For example, as shown in FIG. 4 (A), the oval frame may be arranged in the horizontal direction, or it may be set like the humanoid silhouette in FIG. 4 (B) or the upper and lower lines in FIG. 4 (C). Well, it may be set in any shape. These settings are not only set in advance, but are also configured by the user himself / herself through GUI (Graphical User Interface) using figures such as dots, circles, rectangles, and line segments when starting the length measuring device. Also good.

  The length measuring device 1 detects two reference points such as the upper and lower ends of the subject from the feature points in the photographing guide frame (details of the reference point detection method will be described later), calculates the three-dimensional position of each reference point, The length is measured by calculating the length of the line segment connecting the reference points. Since the position of the shooting guide frame is fixed, the user moves the length measuring device 1 while confirming the video on the display unit 13, and aligns the subject to be measured with the shooting guide frame. At this time, if the video around the photographing guide frame is enlarged and displayed on a part of the display unit 13, it is possible to improve the operability at the time of alignment by the user. Further, the length between the reference points detected as described above is always calculated, and the display in the display area 33 is always updated. At the same time, by displaying the measurement position 32 on the display unit 13, the user can confirm the measurement position and the measurement result in real time. The explanation of the operation method to the user can be performed by displaying as shown in the display area 34. Further, not only the display by characters but also a guide such as voice may be used.

  In addition, the measuring device 1 is equipped with a storage device such as a flash memory, or an external storage device such as a memory card, so that the captured video can be saved as a still image, or the measurement result data can be superimposed on text or still images It is also possible to save in the state. This process can be realized, for example, by determining that the user has pressed the hardware button 35 and writing the information at the time of pressing to the storage device. In addition, when the button is pressed, the video displayed in the live view on the display unit 13 is stopped, and the length measurement result that has been updated and displayed in the display area 33 is also fixedly displayed. The result can be confirmed. The operation method is not limited to hardware buttons. For example, the display unit 13 may be a general touch panel such as a resistive film type or a capacitance type, so that a virtual button displayed on the screen is touched. Or by touching a subject displayed on the screen.

Next, processing details of the length measurement method will be described with reference to the drawings.
FIG. 5 is a flowchart showing the flow of the length measurement process of the length measuring device 1 in the present embodiment. First, the subject is imaged by the first and second imaging units 10 and 11, and two images are acquired (step S10). Next, the distance calculation unit 14 calculates distance information from the two images acquired in step 10 (step S11). Subsequently, the length calculation unit 15 detects the length measurement reference point of the subject from the image of the imaging unit 10 serving as a reference, and calculates the length of the subject by calculating the distance between the reference points (step S12). Finally, the display control unit 16 outputs an image obtained by superimposing the shooting guide frame and the length measurement position on the image of the imaging unit 10 as a reference, and the length measurement result to the display unit 13 (step S13).

  In step S11, the distance calculation unit 14 calculates a distance from the two images acquired in step 10 by a stereo method. In the stereo method, the same region is imaged by two imaging units arranged substantially in parallel, the parallax of corresponding pixels between the two obtained images is obtained, and the distance is calculated based on the parallax. In the stereo method, obtaining corresponding pixels between two images is called stereo matching. For example, the following processing is performed.

  Pixel matching is performed by scanning a certain pixel of one image in the horizontal direction on the other image. Pixel matching is performed in units of blocks centered on the pixel of interest, and a SAD (Sum of Absolute Difference) that calculates the sum of absolute value differences of pixels in the block is calculated to determine a block that minimizes the SAD value. Thus, the pixel on the other image corresponding to the target pixel of one image is obtained. In addition to the SAD calculation method, there are calculation methods such as SSD (Sum of Squared Difference), graph cut, and DP (Dynamic Programming) matching. When the corresponding pixel is obtained, the parallax value of the pixel is known. The parallax value can be calculated even when the two imaging units are arranged in the vertical direction instead of the horizontal direction. In this case, the scanning of the captured image may be performed in the vertical direction instead of the horizontal direction.

  From the obtained parallax value, the distance value is calculated by the formula (1) based on the principle of triangulation. Here, Z is a distance value, f is a focal length of the imaging unit, b is a baseline length between two imaging units, and d is a parallax value.

  The distance calculation described above may be performed for the entire image or for the peripheral position of the photographing guide frame. Since this distance information is used in a length calculation process to be described later, it is only necessary to acquire distance information of a region necessary for length calculation.

  FIG. 1B is a functional block diagram illustrating a configuration example of the length calculation unit 15. The length calculation unit 15 includes a feature point detection unit 15-1, a reference point candidate detection unit 15-2, a length measurement mode determination unit 15-3, a length measurement unit 15-4, and an input / output unit 15-. 5.

  In step S12, the length calculation unit 15 performs length calculation based on the length calculation processing flowchart shown in FIG.

  First, the feature point detection unit 15-1 detects a feature point from the image acquired by the imaging unit 10 (step S20). The detection range may be the entire image, or may be limited within the shooting guide frame or around the shooting guide. The feature point detection can be performed by a general feature point detection method such as a Harris corner detection method. The feature point detection method is not limited to this, and any method may be used as long as the feature point of the subject can be detected from the image.

  Next, the reference point candidate detection unit 15-2 detects a reference point candidate at a position to be measured from the detected feature points (step 21). In the case of FIG. 3B, since the user should have aligned the subject end point with the center position of the shooting guide frames 30, 31, the feature point closest to the center position of the shooting guide frame is set as the reference point candidate. To do.

  In the above, the method for displaying the shooting guide on the display unit and detecting the reference point candidate from the feature points in the shooting guide frame has been described. Alternatively, the reference point candidate may be designated by moving the cursor by key operation.

  Next, the length measurement mode determination unit 15-3 determines the length measurement target. That is, it is determined which of the object measurement mode for measuring the length and width of one object and the interval measurement mode for measuring the interval between two objects (step S22).

  The object measurement mode is a case where the width (line segment 70) of one subject a is measured as shown in FIG. The interval length measurement mode is a case where the interval (line segment 80) between the end points of the subject a and the subject b is measured as shown in FIG.

  However, the reference point candidate detected by the above method may be erroneously positioned on the background side instead of on the subject. This is because when the reference point candidate is obtained by feature point detection, the subject and the background cannot be distinguished from the image information, and the feature point of the subject edge portion may be included on the background side. Further, when the user designates with a touch panel or a cursor, a user's designation mistake occurs.

  For example, in the object length measurement mode, the user may measure the line segment 71 although he / she wants to measure the line segment 70 shown in FIG. In the interval length measurement mode, the line segment 81 is measured although it is desired to measure the line segment 80 in FIG. 8B.

  In order to prevent these measurement position errors, in step S22, the above two length measurement modes are automatically determined, and the position of the reference point candidate detected in step 21 is corrected.

The length measurement mode is determined by referring to the gradient of the distance value and estimating the arrangement relationship of the subject. For example, as shown in FIG. 9, a reference range is defined on a line segment obtained by extending the position of the reference point candidate first found outward, and the distance on this line segment is “close, far, It turns out that it is changing as “close”. Therefore, it can be determined that there is no object inside the reference range 90 and the interval length measurement is being performed. On the other hand, when the distance of the reference range changes from the left side to “far, close, far”, it can be determined that the object is measured because the object exists inside the reference range. . At this time, “near” and “far” are determined when the distance value change at successive positions is equal to or greater than a certain value, that is, when the distance value suddenly changes at the edge portion of the subject. This prevents erroneous determination such as when there is unevenness on the surface of one subject. As described above, the coordinates of at least two reference points used as a reference when calculating the length can be corrected based on the position dependency of the distance information, and the length between the corrected at least two reference points can be calculated. Yes.
The length measurement mode is determined by the above method, and the position of the reference point candidate is corrected according to the length measurement mode.

  Regardless of the length measurement mode, the reference point needs to be on the object located in front rather than on the background or the object located behind.

  Therefore, in the object length measurement mode, if the reference point candidate distance is determined to be “far” compared to the surrounding distance, the reference point candidate is shifted toward the center of the screen, The position on the subject is set as a new reference point.

  In the interval length measurement mode, if the reference point candidate distance is determined to be “far” compared to the surrounding distance, the reference point candidate is shifted in the outward direction of the screen and Is the new reference point.

  When the reference points are determined by the above method, the length measuring unit 15-4 calculates the length between the reference points in step S23. These processes are repeated, and finally the input / output unit 15-5 outputs the length information to the display control unit 16.

  From the two-dimensional position (u, v) on the image of one reference point, the distance Z of the reference point, and the focal length f of the imaging unit, the three-dimensional position (X, Y, Z) in the space of the reference point is It can be calculated by equation (2).

  When the three-dimensional positions of the two reference points calculated by Expression (2) are P1 (X1, Y1, Z1) and P2 (X2, Y2, Z2), respectively, the length L between the reference points is expressed by Expression (3). Is calculated by

  As described above, the length measuring apparatus according to the present embodiment automatically determines the object length measuring mode for measuring the length of one object and the distance length measuring mode for measuring the distance between two objects. By correcting the position of the reference point according to the determined length measurement mode, the length of the position desired by the user can be accurately measured. Also, if the shooting guide is displayed and the subject position to be measured is aligned with the shooting guide, the length can be measured while reducing the burden on the user's operation.

(Second Embodiment)
In the first embodiment, the length measurement method for automatically determining the length measurement mode has been described. However, as described below, the same effect as in the first embodiment can also be obtained by a method in which the user specifies the length measurement mode.

  The length measuring device in the second embodiment has the configuration shown in FIG. 1A as in the first embodiment. The process is the process shown in FIG. In FIG. 10, the same processes as those in FIGS. 5 and 6 are denoted by the same reference numerals.

  Below, the processing method of the length measuring apparatus in this Embodiment is demonstrated using the flowchart figure of FIG.

  First, at the start of use of the length measuring device, the length measuring mode is selected (step S30). As described in the first embodiment, the length measurement mode includes the object length measurement mode and the interval length measurement mode. The length measurement mode selection method can be performed by button operation or touch panel operation.

  Next, in steps S10 and S11, the same processing as that described in the first embodiment is performed.

Next, the length calculation process of step S31 is performed. In the processing in step S31, reference point candidate detection (step S21) and length measurement mode determination (step S22) in the flowchart shown in FIG. 6 are changed to reference point detection (step S32). The reference point detection in step S32 is processing in which the automatic determination part of the length measurement mode is removed from the processing in steps S21 and S22 described in the first embodiment. The configuration in FIG. 1B is similarly changed. Therefore, in step S32, based on the information in step S30, the reference point candidate detection and the reference point candidate position correction are performed simultaneously.
In the last step S13, the same processing as that described in the first embodiment is performed.

  As described above, by specifying the length measurement mode, the length of the desired position can be accurately measured as in the first embodiment after the length measurement mode is surely known. it can.

(Third embodiment)
In the first embodiment or the second embodiment, the distance calculation is performed by the stereo method from the two images of the two imaging units 10 and 11, but the configuration of the length measuring device 100 illustrated in FIG. In addition, one of the imaging units (in the configuration example of FIG. 11, the second imaging unit 11 illustrated in FIG. 1) is replaced with a distance measuring unit 101. In this case, the image processing unit 102 in FIG. 11 is configured by removing the distance calculation unit 13 from the image processing unit 12 illustrated in FIG. 1, and the length calculation unit 14 includes distance information output from the distance measurement unit 101. Is entered directly. 1 and 11 are denoted by the same reference numerals.

  Also in the configuration of FIG. 11, the same effect as that of the first embodiment can be obtained by the same processing method as that of the flowchart of FIG. However, the distance calculation process in step S11 is a distance acquisition process by the distance measuring unit 101, and is performed simultaneously with the image acquisition in step S10.

  The distance measuring unit 101 may use a method using infrared rays typified by a TOF (Time of Flight) method, or any method that can acquire distance information.

  The TOF method measures the distance by irradiating invisible light such as infrared rays from a light source such as an LED (Light Emitting Diode), and measuring the time of flight when the light hits the subject and returns. It is. By measuring the measurement for each finely divided area, it is possible to measure not only one point but also various parts of the subject. In addition, as a method of measuring the time of flight, pulsed laser light, measuring the time from when the pulse is emitted until the reflected light returns, or when the irradiated infrared light is modulated and irradiated There is a method of calculating from the phase difference between the phase and the reflected light.

  As described in the above three embodiments, according to the length measuring device of the present invention, it is calculated from image information captured by at least two imaging units, or distance information is acquired by a distance measuring unit and acquired. Based on the measured distance information, the subject's positional relationship is grasped, and based on the subject's positional relationship, the positions of at least two reference points to be used as a reference when calculating the length are corrected, and the length between the corrected reference points is calculated. By calculating, it is possible to accurately measure the length of the position desired by the user.

  In the above embodiment, in order to make the explanation easy to understand, the length measurement mode is discriminated into the object length measurement mode and the interval length measurement mode. However, it is indispensable to distinguish between these two modes. Absent. For example, when measuring the width of a window glass, it is difficult to acquire distance information of the window glass itself, distance information on the other side of the window glass is acquired, and the window glass part is determined as the background side, and the object It is determined that the measurement is not the measurement of the width of the object but the measurement of the distance between the two objects. However, in actuality, measuring the distance between the window frames from the window frame is equivalent to measuring the width of the window glass, and therefore it is not necessary to determine the length measurement mode as described above.

  In addition, by displaying the shooting guide on the display unit and measuring the length so that the subject position is aligned with the shooting guide, the user can measure the length with a simple and less burdensome operation. Further, if the shooting guide area is enlarged and displayed at that time, the subject can be easily aligned.

  In the above description, the example in which the length measuring device of the present invention is mounted on an information terminal such as a smartphone is described, but the present invention is not limited to this, and by using a device including an imaging unit such as a digital camera, Similar effects can be obtained.

  In the above-described embodiment, the configuration and the like illustrated in the accompanying drawings are not limited to these, and can be appropriately changed within a range in which the effect of the present invention is exhibited. In addition, various modifications can be made without departing from the scope of the object of the present invention.

  Each component of the present invention can be arbitrarily selected, and an invention having a selected configuration is also included in the present invention.

  In addition, a program for realizing the functions described in the present embodiment is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute processing of each unit. May be performed. The “computer system” here includes an OS and hardware such as peripheral devices.

  Further, the “computer system” includes a homepage providing environment (or display environment) if a WWW (World Wide Web) system is used.

  The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions in combination with a program already recorded in a computer system. At least a part of the functions may be realized by hardware such as an integrated circuit.

  The present invention is applicable to a length measuring device.

DESCRIPTION OF SYMBOLS 1 Length measuring apparatus 10 1st imaging part 11 2nd imaging part 12 Image processing part 13 Display part 14 Distance calculation part 15 Length calculation part 15-1 Feature point detection part 15-2 Reference point candidate detection part 15-3 Length measurement Mode determination unit 15-4 Length measurement unit 15-5 Input / output unit 16 Display control unit 20 Subject 30 Shooting guide frame 31 Shooting guide frame 32 Measurement position 33 Display region 34 Display region 35 Button 70 Line segment 71 Line segment 80 Line Minute 81 Line segment 90 Reference range 100 Length measuring device 101 Distance measuring section 102 Image processing section

Claims (12)

An image processing unit that performs image processing on image information captured by an imaging unit, and a length measuring device comprising:
The image processing unit
A distance calculating unit that calculates distance information from image information captured by the imaging unit;
A length calculation unit that corrects the coordinates of at least two reference points to be used as a reference when calculating the length based on the position dependency of the distance information, and calculates a length between the corrected at least two reference points; A length measuring device characterized by that. And a display unit for displaying image information subjected to image processing by the image processing unit;
A length measuring apparatus comprising: a display control unit that outputs an image captured by the imaging unit and a calculation result of the length to the display unit. Furthermore, it has a distance measuring unit,
The length measuring apparatus according to claim 1, wherein the distance calculating unit calculates a distance by the distance measuring unit. The length calculator is
4. The coordinate of the at least two reference points is corrected for the positional relationship of the subject imaged by the imaging unit according to the specified positional relationship of the subject. The length measuring device according to item 1.   The length measuring device according to any one of claims 1 to 4, wherein the imaging unit is configured by a single imaging unit.   5. The length measuring device according to claim 1, wherein the imaging unit includes at least two imaging units of first and second. The length calculator is
A feature point detection unit for detecting a feature point from the image acquired by the imaging unit;
A reference point candidate detection unit for detecting a reference point candidate for a position to be measured from the detected feature points;
A length measurement mode determination unit for determining the length measurement target;
The length measuring device according to claim 1, further comprising a length measuring unit that calculates a length between reference points.   8. The display control unit according to claim 1, wherein the display control unit superimposes and outputs a shooting guide to assist at the time of length measurement on at least one of the images shot by the imaging unit. The length measuring device according to any one of the above.   The length measuring device according to claim 8, wherein an area near the photographing guide is enlarged and displayed on a part of the display unit. An image processing step for performing image processing on the captured image information;
The image processing step includes
A distance calculating step for calculating distance information from the captured image information;
A length calculation step of correcting the coordinates of at least two reference points to be used as a reference when calculating the length based on the position dependency of the distance information, and calculating a length between the corrected at least two reference points;
A length measuring method characterized by comprising:   The length measurement method according to claim 10, further comprising a display control step of outputting the photographed image and the calculation result of the length to a display unit.   The program for making a computer perform the length measuring method of Claim 10 or 11.

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