JP2015228605A - Digital camera, feature photography system and feature photography method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel digital camera which allows for easier measurement of the size and the like of a feature that is reflected in one image (single image) from the image, and to provide a feature photography system and a feature photography method.SOLUTION: A planar reference scale is installed on the ground surface of a subject space to be captured by means of a digital camera, two straight line components in the display image are specified, the vanishing point in the display image is determined based on the straight line components, and then a perspective mesh is created based on the vanishing point and that perspective mesh is synthesized to the image thereof. With such an arrangement, the height, width, depth of a feature and the distance between features can be measured easily with only the single image on the basis of the relationship of the planar reference scale and the perspective mesh in the image.

Description

  The present invention relates to a digital camera, a feature photographing system, and a feature capable of easily measuring the size and height of a feature such as a building, a road, and a tree captured from a single image photographed by a camera. It relates to the shooting method.

  As a method for measuring the size and height of features such as buildings and roads captured in an image taken with a digital camera or a still camera, for example, it is disclosed in Patent Documents 1 and 2 below. As is known, a method using a plurality of images using parallax is known.

  However, in the method using a plurality of images, it is necessary to process a plurality of images in order to measure a feature in one subject space, which increases the burden of data processing, and two locations for the same subject space. Since it is necessary to shoot from the above, the burden of shooting is also great.

  Therefore, the present inventors have proposed a technique for accurately measuring the size and height of a feature captured in a single image (single image) as shown in Patent Document 3 below, for example. And has already obtained a patent. This technique takes a roadside image that includes a linear object of known length, calculates the vanishing point using the side line of the road included in this roadside image, and measures based on this vanishing point. The feature data is measured based on the actual length per pixel at the desired measurement site of the target feature.

JP 2007-206099 A JP 2000-74669 A Japanese Patent No. 5256464

  According to the technique shown in Patent Document 3, it is possible to accurately measure the size and height of a feature captured in a single image (single image). Therefore, it is necessary to perform processing by pixel information of a camera that has been photographed, a PC for measurement, or dedicated image processing software, and a simpler technique is desired.

  Accordingly, the present invention has been devised to solve these problems, and its purpose is to increase the size and height of features reflected in the image from a single image (single image). It is intended to provide a novel digital camera, a feature photographing system, and a feature photographing method that can be easily measured.

  In order to solve the above-mentioned problem, the first invention is to take a picture with the posture adjustment means for adjusting the posture of the camera body vertically and horizontally with respect to the ground of the photographing place, and the camera body whose posture is adjusted by the posture adjustment means. Two parallel linear components in a display image including a plane reference scale that is installed on the ground of the subject space and is captured in the image together with the features, and the plane reference scale displayed on the display unit of the camera body, or A linear component designating unit for designating two parallel linear components of a plane reference scale in the display image, and a vanishing point for determining a vanishing point in the display image based on the two linear components designated by the linear component designating unit Point determination means, perspective mesh generation means for generating a perspective mesh over substantially the entire display image so that a convergence point coincides with the vanishing point determined by the vanishing point determination means, and the perspective mesh An image composition unit for synthesizing the perspective mesh generated by the generation unit with the display image to generate an image with a perspective mesh, and an image data storage unit for storing the image with the perspective mesh synthesized by the image synthesis unit. It is a digital camera characterized by this.

  According to such a configuration, the measurement target captured in the image is based on the relationship between the plane reference scale whose size is known in the display image and the perspective mesh generated in the image. It is possible to easily measure the height, width, depth, distance between features, etc. of a feature using only that single image. In addition, since an image with perspective mesh that is a measure of measurement can be obtained with a single digital camera, processing by a personal computer or dedicated image processing software becomes unnecessary.

  According to a second aspect of the present invention, in the first aspect of the present invention, the image processing device further comprises a direction mark generation unit that detects a direction of east, west, south, and north in the display image and generates a mark indicating any one of the directions. In the digital camera, the azimuth mark generated by the azimuth mark generation means is combined with the perspective meshed image. According to such a configuration, it is possible to grasp at a glance not only the height of the feature but also the east, west, south, and north directions of the captured image.

  According to a third invention, in the first or second invention, the camera body further includes position information detection means for detecting position information of the camera body, wherein the image composition means is detected by the position information detection means. Is added to the perspective meshed image data. According to such a configuration, it is possible to easily know not only the height of the feature but also the position information of the photographing position.

  According to a fourth aspect of the present invention, there is provided posture adjustment means for adjusting the posture of the digital camera vertically and horizontally with respect to the ground at the shooting location, and the ground in the subject space photographed by the digital camera adjusted in posture by the posture adjustment means. A plane reference scale that is installed and photographed with a feature, and two parallel linear components in a display image including the plane reference scale displayed on the display unit of the camera body or a plane reference scale in the display image Linear component designating means for designating two parallel linear components, vanishing point determining means for determining a vanishing point in the display image based on the two linear components designated by the linear component designating means, and the vanishing point A perspective mesh generating unit configured to generate a perspective mesh over substantially the entire display image so that a convergence point coincides with the vanishing point determined by the determining unit; and the display image including the plane reference scale includes the perspective Perspective mesh generated in Mesh generation means synthesizes a feature imaging system characterized in that it comprises an image synthesizing means for generating a perspective mesh-containing image.

  According to such a configuration, in addition to the same effects as those of the first invention, a general-purpose digital camera is used for photographing, and RAW data obtained by the digital camera is processed using a general-purpose personal computer. A perspective meshed image can be easily obtained.

  According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the image processing device further includes a direction mark generation unit that detects a direction of east, west, north, south, and north in the display image and generates a mark indicating any one of the directions. The feature photographing system characterized in that the direction mark generated by the direction mark generation means is combined with the perspective meshed image. According to such a configuration, as in the second aspect, not only the height of the feature but also the east, west, south, and north directions of the captured image can be grasped at a glance.

  According to a sixth invention, in the fourth or fifth invention, the digital camera further comprises position information detecting means for detecting position information of the digital camera, wherein the image composition means is the digital camera detected by the position information detecting means. Is added to the perspective meshed image data. According to such a configuration, it is possible to easily know not only the height of the feature but also the position information of the photographing position as in the third invention.

  According to a seventh aspect of the present invention, there is provided an attitude adjustment step for adjusting the attitude of the digital camera vertically and horizontally with respect to the ground at the shooting location, and a ground in a subject space photographed by the digital camera adjusted in the attitude adjustment step. A display step of installing a plane reference scale and displaying it together with the features, and two parallel linear components in the display image including the plane reference scale displayed in the display step, or a parallel of the plane reference scale in the display image A linear component specifying step for specifying two linear components, a vanishing point determining step for determining a vanishing point in the display image based on the two linear components specified in the linear component specifying step, and the vanishing point determination A perspective mesh generation step for generating a perspective mesh over substantially the entire display image so that a convergence point coincides with the vanishing point determined in the step; An image synthesis step of synthesizing the perspective mesh generated in the perspective mesh generation step with the display image including the plane reference scale photographed by the step to generate an image including the perspective mesh. It is a shooting method.

  According to such a photographing method, as in the first invention, the image is determined based on the relationship between the plane reference scale whose size is known in the display image and the perspective mesh generated in the image. It is possible to easily measure the height, width, depth, distance between features, and the like of the feature to be measured captured in the single image alone. In addition, since an image with perspective mesh that is a measure of measurement can be obtained with a single digital camera, processing by a personal computer or dedicated image processing software becomes unnecessary.

  The eighth invention further includes an azimuth mark generating step of detecting a azimuth of east, west, south, and north in the display image and generating a mark indicating any one of the directions in the seventh image. The feature photographing method, wherein the orientation mark generated in the orientation mark generation step is combined with the perspective meshed image. According to such a photographing method, as in the second invention, it is possible to grasp not only the height of the feature, but also the east, west, south, and north directions of the photographed image at a glance.

  A ninth invention further includes a position information detection step of detecting position information of the digital camera in the seventh or eighth invention, and the digital camera detected in the position information detection step in the image synthesis step. Is added to the perspective meshed image data. According to such a photographing method, it is possible to easily know not only the height of the feature but also the position information of the photographing position as in the third invention.

1 is an overall (rear) view showing an embodiment of a digital camera 100 according to the present invention. It is a perspective view which shows an example of the plane reference | standard scale 120 which comprises some digital cameras 100 concerning this invention. 1 is a block diagram showing a configuration of a digital camera 100 according to the present invention. 1 is a block diagram illustrating a configuration of an image processing engine 140 of a digital camera 100 according to the present invention. It is explanatory drawing which shows the motion of the markers M1 and M2 of the attitude | position display part 117, and its change. 4 is an explanatory diagram showing a relationship between a left and right posture of a camera body 110 and a posture display unit 117 thereof. FIG. It is explanatory drawing which shows the example of a display of the attitude | position display part 117 when the camera main body 110 inclines to the left. It is explanatory drawing which shows the example of a display of the attitude | position display part 117 when the camera main body 110 inclines to the right. 4 is an explanatory diagram showing a relationship between a front-and-rear posture of a camera body 110 and a posture display unit 117 thereof. FIG. It is explanatory drawing which shows the example of a display of the attitude | position display part 117 when the camera main body 110 inclines ahead. It is explanatory drawing which shows the example of a display of the attitude | position display part 117 when the camera main body 110 inclines back. It is a flowchart figure which shows the flow of a process of the feature imaging method by the digital camera 100 concerning this invention. It is a figure which shows the example of a display screen image | photographed by putting the plane | planar reference | standard scale 120 on the floor surface of object space. It is a figure which shows the state which designated on the screen two linear components in the display screen of FIG. It is a figure which shows the state which calculated | required the vanishing point P from the two linear components designated in FIG. 3 is a diagram illustrating an example of a perspective mesh N. FIG. It is a figure which shows the example of a display screen which produced | generated the perspective mesh N based on the vanishing point P calculated | required in FIG. It is a figure which shows the example of an image on which the perspective mesh N and the direction mark Y were displayed. It is a figure which shows the data structure of the image with perspective mesh N. It is a figure which shows the example of the direction mark Y which shows the east, west, north, and south combined with an image.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 shows an embodiment of a digital camera 100 according to the present invention. As shown in the figure, the digital camera 100 includes a camera body 110 and a flat reference scale 120 as shown in FIG.

  The camera body 110 includes a liquid crystal monitor 112, a viewfinder 113, a camera operation unit 114, a shutter 115, and the like in a box-shaped casing 111 made of plastic or light metal. Etc. are almost the same as general digital cameras on the market. A pole-like support leg 116 having a length of, for example, about 1 m is detachably provided on the bottom surface of the casing 111 with screws or the like. The posture of the camera main body 110 can be adjusted in the front-rear and left-right directions while the support legs 116 are landed on the ground or floor of the shooting location. This attitude adjustment method will be described later.

  FIG. 2 is a perspective view showing an example of the flat reference scale 120. As shown in the figure, the plane reference scale 120 is formed by vertically and horizontally forming squares 121 having vertical and horizontal lengths determined on the surface of a rectangular flat scale main body 122 that is white or an arbitrary color. When the subject space is photographed by the camera body 110, the subject body is set on the ground or floor surface of the subject space and photographed together with the features of the subject space. In the case of the plane reference scale 120 shown in FIG. 2, four squares 121 each having a vertical and horizontal length of 1 m (1 m × 1 m) are arranged vertically and horizontally. Of course, there are various patterns depending on the size and type of the subject space to be photographed. Further, the plane reference scale 120 is not limited to a solid board shape but may be a foldable sheet shape.

  FIG. 3 is a block diagram showing a functional configuration of the digital camera 100. As shown in the figure, the digital camera 100 includes a lens 130 that converges light in the subject space, an image sensor 131 such as a CCD or CMOS that converts light passing through the lens 130 into an electrical signal, and the image sensor 131. An AD converter (AD converter) 132 that converts (quantizes) the intensity of the light received by the analog signal into a digital signal, and an image that will be described later based on the digital signal obtained by the AD converter 132. An image processing engine 140 that creates data, an image compression unit 150 that compresses image data obtained by the image processing engine 140 according to the JPEG method, and the like, and the image data compressed by the image compression unit 150 are stored And a data storage unit 160 composed of a memory card or the like.

  The liquid crystal monitor 112 provided on the back surface of the casing 111 is provided with a touch panel 112a so that a touch operation on the liquid crystal monitor 112 by a photographer is detected and input to the image processing engine 140. It has become. Further, the camera body 110 is provided with an information acquisition unit 170, and various pieces of shooting information such as position information from a GPS antenna (not shown), shooting date and time, camera model name, aperture value, number of pixels, ISO sensitivity, and the like. Are acquired as Exif data and recorded in each image data. It is also possible to extract and record the image data after image processing as TIFF data D2 without being compressed as it is, or to extract the raw data D1 before image processing as it is.

  FIG. 4 is a block diagram showing the configuration of the image processing engine 140. As shown in the figure, the image processing engine 140 extracts RGB data from AD-converted RAW data and generates an RGB image (color image), and the RGB image generation unit 141 generates the image. An image adjustment unit 142 that adjusts the brightness, white balance, sharpness, contrast, and the like of the color image to make it easy to see, a vanishing point generation unit 143 that generates a vanishing point P in the image of the subject space, and this disappearance The perspective mesh generation unit 144 that generates the perspective mesh N from the vanishing point P generated by the point generation unit 143, the perspective mesh N generated by the perspective mesh generation unit 144, and the subject whose image has been adjusted by the image adjustment unit 142 It is mainly composed of an image composition unit 145 that composes and outputs a spatial image. The functions of the vanishing point generation unit 143, the perspective mesh generation unit 144, and the image composition unit 145 will be described later.

  Further, as shown in FIG. 1, a posture display unit 117 that displays the posture of the camera body 110 is provided in the liquid crystal monitor 112. As shown in FIG. 5A, the posture display unit 117 is arranged along the horizontal ellipse SC, the left and right level line L1 displayed so as to extend in the horizontal direction in the horizontal ellipse SC, and the left and right level line L1. And a marker M1 that moves left and right, a front-rear level line L2 that is displayed so as to be perpendicular to the top and bottom at the center of the left-right level line L1, and a marker M2 that moves up and down along the front-rear level line L2. Has been. The markers M1 and M2 follow the left and right level lines L1 and the front and rear level lines L2 according to the degree of tilt of the camera body 110 detected by the left and right tilt sensor S1 and the front and rear tilt sensor S2 incorporated in the camera body 110, respectively. To move.

  6 to 8 show the relationship between the tilt of the camera body 110 in the left-right direction and the marker M1 that moves on the left-right level line L1. First, as shown in FIG. 6, when the horizontal axis of the camera body 110 is horizontally positioned in the left-right direction, the marker M1 is positioned at the center of the left-right level line L1, that is, at the intersection with the front-rear level line L2. ing. On the other hand, when the camera body 110 is tilted to the left as shown in FIG. 7, the marker M1 moves to the left of the left and right level line L1, and the camera body 110 is tilted to the right as shown in FIG. And the marker M1 moves the left-right level line L1 to the right. Thereby, it can be easily known that the camera body 110 is tilted leftward or rightward. Further, since the movement distance of the marker M1 is proportional to the inclination angle, the degree of inclination can be easily grasped by looking at the movement distance from the central portion.

  On the other hand, FIGS. 9 to 11 show the relationship between the tilt in the front-rear direction of the camera body 110 and the marker M2 moving on the front-rear level line L2. First, as shown in FIG. 9, when the optical axis of the camera body 110 is horizontally positioned in the front-rear direction, the marker M2 is positioned at the center of the front-rear level line L2, that is, at the intersection with the left-right level line L1. Yes. On the other hand, when the camera body 110 is tilted forward as shown in FIG. 10, the marker M2 moves upward in the front-rear level line L2, and when the camera body 110 is tilted backward as shown in FIG. M2 moves down the front and rear level line L2. This makes it easy to know that the optical axis of the camera body 110 is tilted in either the front-rear direction. Further, since the movement distance of the marker M2 is also proportional to the inclination angle, the inclination degree can be easily grasped by looking at the movement distance from the center.

  Therefore, if the marker M1 and the marker M2 are overlapped at the intersection of the left and right level line L1 and the front and rear level line L2, it can be seen that the camera body 110 is positioned horizontally in the front and rear and right and left. Since the camera body 110 is supported by the single pole-shaped support leg 116 as described above, the camera body 110 is simply moved back and forth and left and right around the grounding point of the support leg 116 as an axis. Its position can be adjusted easily. Further, the colors of the markers M1 and M2 are different from each other, for example, the marker M1 is indicated by a green dot or circle, the marker M2 is indicated by a red dot or circle, and different when they are overlapped as shown in FIG. 5B. The color may be changed, for example, orange. By doing so, it can be grasped visually at a glance that the camera body 110 is in a horizontal state with respect to the ground or floor surface at the shooting location.

  Next, an example of a feature photographing method using the digital camera 100 of the present invention having such a configuration will be described. First, as shown in step S100 of the flowchart of FIG. 12, when the location of the subject space to be imaged is selected, the plane reference scale 120 is placed on the ground or floor of the subject space as shown in next step S102. Is installed. The example of FIG. 13 shows an image in which a corridor in a building is selected as a subject space, a flat reference scale 120 is installed at the approximate center of the corridor, and this is displayed on the liquid crystal monitor 112 of the camera body 110. is there. The display image of the subject space displayed on the liquid crystal monitor 112 becomes smaller as the distance increases, and the natural perspective display is the same as when viewed visually. Further, when installing the flat reference scale 120, it is desirable that each side of the grid 121 is parallel (orthogonal) to the optical axis direction as much as possible.

  Next, the process proceeds to step 104, and based on the movement of the markers M <b> 1 and M <b> 2 displayed on the posture display unit 117, the posture of the camera body 110 is adjusted so as to be horizontally positioned in the front, rear, left and right directions. In the next step S106, an image of the subject space in which the posture of the camera body 110 is horizontal in front, back, left, and right is displayed on the liquid crystal monitor 112, and whether the installed plane reference scale 120 is captured on the display image after position adjustment. If it is not captured, the plane reference scale 120 is moved to a position where it is captured.

  Next, the process proceeds to step 108, in which two linear components extending in the optical axis direction are designated and displayed from the image displayed on the liquid crystal monitor 112 with a touch pen or a finger. In the example of FIG. 14, the straight line portions on both sides of the corridor are selected, and two straight line components a1 and a2 are selected by tracing each straight line with a touch pen. In addition, it is possible to generate and select two straight line components a1 and a2 by a method of designating two points on each straight line. In the next step S110, the vanishing point P is generated in the display image based on the two linear components a1 and a2. The vanishing point P here refers to a point at which two straight lines parallel to the optical axis (line of sight) of the camera intersect in perspective (projection projection). In the example of FIG. 15, since the dotted lines b1 and b2 that are the extended lines of the two linear components a1 and a2 intersect at the wall surface at the end, the intersection is determined as the vanishing point P.

  The generation of the vanishing point P is processed by the vanishing point generating unit 143 of the image processing engine 140 shown in FIG. That is, the vanishing point generation unit 143 has a known drawing function, and when two linear components are specified via the touch panel 112a of the liquid crystal monitor 112, an extension line of each linear component is calculated to display a dotted line. In addition, it has a function of selecting the intersection of the extension lines as the vanishing point P and displaying it on the liquid crystal monitor 112.

  Next, in step S112, a perspective mesh N is generated on the display image based on the vanishing point P thus determined and the two linear components a1 and a2. For example, as shown in FIG. 16, the perspective mesh N includes a horizontal mesh NU in which meshes arranged at equal intervals extend in the depth direction and the horizontal direction, and vertical meshes NS1 and NS2 in which the mesh extends in the depth direction and the vertical direction. It consists of three mesh bodies. Then, the convergence points in the depth direction of the meshes NU, NS1, NS2 coincide with the vanishing point P, and the two linear components a1, a2 respectively coincide with the lines in the depth direction on both sides of the horizontal mesh NU. Yes. The perspective mesh N may be composed of bitmap data (Bitmap Data: BMP, GIF, JPEG, JPEG XR, PNG, PNM, TIFF, XPM, WebP, etc.), but vector data (Vector Data: EPS , PDF, SVG, etc.), even if the image is enlarged or reduced, the line size does not change, so a relatively easy-to-view image can be obtained. In addition, when a part of the image is displayed enlarged, the mesh is enlarged so that the mesh and the image are linked, or the mesh of the part is kept so that the mesh line does not become thick when the image is enlarged. May be redrawn.

  FIG. 17 shows an example in which a perspective mesh N is generated on the display image based on the vanishing point P and the two linear components a1 and a2 obtained in FIG. 15 and displayed superimposed on the image. is there. Thus, by generating the perspective mesh N on the image, the size of each feature can be easily and accurately measured. For example, in the image of FIG. 17, the length of one grid of the captured plane reference scale 120 and the length (width) of one mesh of the displayed perspective mesh N substantially coincide with each other. If one square of the scale 120 is 30 cm, it can be seen that the length (width) of each mesh of the synthesized perspective mesh N is 30 cm.

  Referring to FIG. 17, the corridor width corresponds to nine meshes of the horizontal mesh NU among the perspective meshes N, and thus it can be seen that the width is 30 cm × 9 = 270 cm. In addition, since the lower frame of the window provided on the left side wall surface from the floor surface of this corridor is located slightly higher than the five meshes from below the vertical mesh NS2, the height to the lower frame of the window is It can be seen that 30 cm × 5 = 150 cm + α. In addition, since the lower frame of the window on the right wall surface which is the opposite surface is located slightly lower than the five meshes from below the vertical mesh NS1, the height to the lower frame of the window is the window on the left wall surface. It can be seen that it is lower than the lower frame and less than 150 cm. Moreover, since the depth of the window on the right side wall surface corresponds to four meshes of the vertical mesh NS1, it can be seen that the width is 30 cm × 4 = 120 cm.

  Returning to the flow of FIG. 12, if the perspective mesh N is generated in this way, the process proceeds to step S114 as a final step, and the image is captured by pressing the shutter in that state to synthesize the perspective mesh N (step In step S116, the photographed image data is stored in the memory card (step S118), and the process ends.

  Then, if the image including the perspective mesh captured and stored in this manner is printed out together with the perspective mesh N or displayed on the PC, one image (single image) is based on the perspective mesh N as described above. Therefore, it is possible to easily measure the features. Although FIGS. 13 to 17 show examples of the subject space indoors, it is a matter of course that the present invention can be similarly applied to the outdoors as shown in FIG.

  In the case of outdoors, for example, a side line of a road or a sidewalk can be designated as a straight line component. However, even if there is no appropriate straight line component in the subject space, the plane reference scale 120 installed on the ground in the depth direction. If two linear components are specified, the vanishing point P can be easily obtained, and the perspective mesh N necessary for measurement can be generated. In particular, in the case of outdoors, natural objects such as trees standing on the side of the road do not have building data like artificial buildings such as buildings and houses. Therefore, according to the feature photographing method of the present invention, The height, size, etc. can be accurately measured from one image.

  Further, the perspective meshed image obtained in this way is not only the information of the perspective mesh N as shown in FIG. 19, but also the shooting date / time, camera model name, aperture value, number of pixels, ISO sensitivity, and GPS. Since position information and the like can be included, the utilization and reliability of the image are also increased. Further, as shown in FIG. 20, the east, west, south, and north directions in the display image of the liquid crystal monitor 112 are detected to generate a mark Y indicating one of the directions, and the direction mark Y is set as shown in FIG. By synthesizing the image with the perspective mesh, it is possible to grasp not only the height of the feature but also the direction of the east, west, south, and north of the captured image at a glance. As a method of generating this orientation mark Y, it can be easily generated and displayed by using a known technique such as disclosed in Japanese Patent No. 5262232 of the present applicant.

  In the present embodiment, the image processing engine 140 of the camera main body 110 generates the perspective meshed image. However, as shown in FIG. 3, the raw data D1 before image processing is taken out and is stored in the PC. It is also possible to read the image and perform subsequent image processing on the PC side. With such a configuration, a commercially available general-purpose digital camera can be used as it is.

DESCRIPTION OF SYMBOLS 100 ... Digital camera 110 ... Camera body 112 ... Liquid crystal monitor (display part)
DESCRIPTION OF SYMBOLS 116 ... Supporting leg 117 ... Posture display part 120 ... Plane reference scale 121 ... Grid 122 ... Plane scale main body 130 ... Lens 131 ... Imaging element 132 ... AD converter 140 ... Image processing engine 141 ... RGB image generation part 142 ... Image adjustment Unit 143. Vanishing point generating unit (vanishing point generating means)
144 ... Perspective mesh generation unit (perspective mesh generation means)
145 ... Image composition unit (image composition means)
DESCRIPTION OF SYMBOLS 150 ... Image compression part 160 ... Data storage part 170 ... Information acquisition part a1, a2 ... Linear component P ... Vanishing point N ... Perspective mesh NU ... Horizontal mesh NS ... Vertical mesh Y ... Direction mark

Claims (9)

Posture adjusting means for adjusting the posture of the camera body vertically and horizontally with respect to the ground of the shooting location;
A plane reference scale that is installed on the ground of the subject space photographed by the camera body whose posture is adjusted by the posture adjusting means and photographed together with the feature;
Linear component designating means for designating two parallel linear components in a display image including the plane reference scale displayed on the display unit of the camera body or two parallel linear components of the plane reference scale in the display image; ,
Vanishing point determining means for determining a vanishing point in the display image based on two linear components specified by the linear component specifying means;
Perspective mesh generating means for generating a perspective mesh over substantially the entire display image so that a convergence point coincides with the vanishing point determined by the vanishing point determining means;
Image synthesizing means for synthesizing the perspective mesh generated by the perspective mesh generating means with the display image to generate an image with perspective mesh;
A digital camera comprising: image data storage means for storing the perspective meshed image synthesized by the image synthesis means. The digital camera according to claim 1, wherein
Azimuth mark generating means for detecting the azimuth of east, west, south, and north in the display image and generating a mark indicating any one of the directions,
The digital camera characterized in that the image synthesizing unit synthesizes the azimuth mark generated by the azimuth mark generating unit with the perspective meshed image. The digital camera according to claim 1 or 2,
Further comprising position information detecting means for detecting position information of the camera body;
The digital camera according to claim 1, wherein the image synthesizing unit adds the position information of the camera body detected by the position information detecting unit to the image data including the perspective mesh. Posture adjustment means for adjusting the posture of the digital camera vertically and horizontally with respect to the ground of the shooting location;
A flat reference scale installed on the ground of the subject space photographed by the digital camera whose posture is adjusted by the posture adjusting means and photographed together with the features;
Linear component designating means for designating two parallel linear components in a display image including the plane reference scale displayed on the display unit of the digital camera or two parallel linear components of the plane reference scale in the display image; ,
Vanishing point determining means for determining a vanishing point in the display image based on two linear components specified by the linear component specifying means;
Perspective mesh generating means for generating a perspective mesh over substantially the entire display image so that a convergence point coincides with the vanishing point determined by the vanishing point determining means;
And an image composition unit for synthesizing a perspective mesh generated by the perspective mesh generation unit with a display image including the plane reference scale photographed by the digital camera to generate an image including a perspective mesh. Feature shooting system. The feature photographing system according to claim 4,
Azimuth mark generating means for detecting the azimuth of east, west, south, and north in the display image and generating a mark indicating any one of the directions,
The feature photographing system characterized in that the image synthesizing unit synthesizes the azimuth mark generated by the azimuth mark generating unit with the perspective meshed image. The feature photographing system according to claim 4 or 5,
Further comprising position information detecting means for detecting position information of the digital camera;
The feature photographing system according to claim 1, wherein the image synthesizing unit adds the position information of the digital camera detected by the position information detecting unit to the image data including the perspective mesh. A posture adjustment step for adjusting the posture of the digital camera vertically and horizontally with respect to the ground of the shooting location;
A display step in which a plane reference scale is set on the ground of the subject space photographed by the digital camera whose posture is adjusted in the posture adjustment step and displayed on the display unit of the digital camera together with the features;
A linear component designating step of designating two parallel linear components in a display image including the plane reference scale displayed in the display step or two parallel linear components of the plane reference scale in the display image;
A vanishing point determining step for determining a vanishing point in the display image based on the two linear components specified in the linear component specifying step;
A perspective mesh generation step for generating a perspective mesh in substantially the entire display image so that a convergence point matches the vanishing point determined in the vanishing point determination step;
An image synthesis step of synthesizing the perspective mesh generated in the perspective mesh generation step with the display image including the plane reference scale displayed in the display step to generate an image including the perspective mesh. Feature shooting method. The feature photographing method according to claim 7,
Further comprising an orientation mark generating step of detecting an orientation of east, west, north, and south in the display image and generating a mark indicating any one of the orientations;
In the image composition step, the orientation mark generated in the orientation mark generation step is combined with the perspective meshed image. The feature photographing method according to claim 7 or 8,
A position information detecting step for detecting position information of the digital camera;
In the image composition step, the position information of the digital camera detected in the position information detection step is added to the image data including the perspective mesh.

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