JP2004212142A - Method of measuring dimension of image - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method by which a dimension in an image can be measured through simple processing without required special equipment nor material. <P>SOLUTION: A rectangular shape having an already known height and width is selected from an image displayed on a display. Then the intersection of the diagonals of a set rectangle S is calculated and the calculated intersection is set as a reference point C0. In addition, the far points (vanishing points) V1 and V2 which are the intersections of the extended lines of the facing sides of the reference rectangle S are found. Thereafter, coordinate axes X and Y are provided based on the far points (vanishing points) V1 and V2 and reference point C0 and scales in the X- and Y-axis directions are set based on coordinate axes X and Y and the height of the rectangle S from the reference point C0 and the width of the rectangle S. Finally, the dimension in the image is made measurable through simple processing without required special equipment nor material by calculating the coordinates between two points on an image designated from the reference point C0 by using the set scales and measuring the dimension between the two points based on the calculated coordinates. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
FIELD OF THE INVENTION
The present invention relates to a method for measuring an image size for measuring the size of an image displayed on a display. In particular, since the length of each part of a building can be measured from one image taken by a digital camera, The present invention relates to a method for measuring image dimensions suitable for use in surveying and the like.
[0002]
[Prior art]
As a surveying method using a camera, for example, there is a method shown in [Patent Document 1]. In this method, the same subject is photographed from two different directions, and a photo control point (a mark) is set in the photographed stereo image. Then, the actual measurement value of the control point is compared with a calculated value obtained as a result of the control work, thereby enabling surveying.
[0003]
Specifically, as shown in FIGS. 19A and 19B, the subject 13 that can take a point having a known “plane coordinate” and a point having a known “height” is photographed in both left and right photographs. (Marks: targets T1 to T3 may be installed). Then, for example, a value of an unmeasurable place such as the length of the side K3 or the height of the side K4 is calculated by locating the stereo photograph.
[0004]
Therefore, a stereo image taken by a digital camera or the like is displayed on a display of a personal computer or the like, and the machine coordinates that can be read by the computer by pointing the control points P1 to P9 of the displayed stereo image with a mouse or the like as indicated by reference numeral 12. get. When the machine coordinates can be obtained, the orientation program is started as shown in FIG. 20 ("process" 100: hereinafter "process" is omitted).
[0005]
When the orientation program starts, data necessary for orientation such as the focal length of the digital camera, the pixel size of the sensor, the number of pixels of the sensor, and the machine coordinates of the orientation points P1 to P9 are input (110). Then, the machine coordinate values of all the control points P1 to P9 such as the “actually measured control points”, the “control points to be obtained for coordinates”, and the “remaining control points” in the stereo photograph are subjected to Afan transformation or Helmert transformation processing. It is converted into a photograph coordinate value by an internal orientation process (120). Next, a combination of the converted control points P1 to P9 is created. In this combination, all combinations of the control points P1 to P9 are comprehensively created without duplication (130). Further, the created combination of the control points, the “actually measured control points” and the “control points for which coordinates are to be obtained” are mutually set. That is, the orientations of the Euler angles ω, θ, κ, etc. around the X, Y, and Z axes of the left and right stereo photographs, respectively, are determined, and the relative inclination and positional relationship between the left and right photographs are determined. The two are converted into coordinate values of the synthesized three-dimensional model (140). Then, the converted model coordinate values are converted into absolute coordinates in the real space (absolute orientation) (150). It is compared whether the absolute coordinates and the actual coordinates are within the allowable residual (160) (170). If the absolute coordinates are within the error, the absolute coordinate values are adopted (180), and it is confirmed whether all the combinations have been oriented. (190), the result is displayed (200), and otherwise, the process is repeated (190).
[0006]
In this way, by using the coordinate system constructed in the computer, dimensions of places where measurement cannot be performed, such as the length of the side K4 and the height of the side K3, can be processed and calculated in the computer.
[0007]
[Patent Document 1]
JP-A-2002-31527
[Problems to be solved by the invention]
However, in the surveying method as described above, since a stereo photograph must be taken, special equipment for taking the photograph is required.
[0009]
In addition, since the stereo image must be converted to the coordinate system of the three-dimensional model by mutual orientation, and further converted to the coordinate system in the computer by absolute orientation, the processing is complicated.
[0010]
Further, even when measuring a part of the dimensions, the calculation cannot be performed unless all the images are once converted into the coordinate system in the computer, which is wasteful.
[0011]
Furthermore, when capturing an image, there are many regulations, such as the need to determine a control point and perform actual measurement, which is complicated and complicated.
[0012]
Therefore, an object of the present invention is to make it possible to measure dimensions by simple processing without requiring special equipment and without providing a coordinate system of a three-dimensional model, and to perform processing only on necessary parts. In addition to shortening the processing time, it is not necessary to perform complicated operations when capturing an image.
[0013]
[Means for Solving the Problems]
In order to solve the above problem, according to the present invention, when a rectangular shape having a known height and width is selected and set from an image displayed on a display, a rectangular shape is set based on the coordinates of the set rectangle. Is calculated, and the coordinates of the calculated intersection are used as a reference point. From the reference point, the scales in the X-axis and Y-axis directions on the image are obtained based on the height and width of the rectangle, and the obtained scale is obtained. , The coordinates between two points on the image specified from the reference point are calculated, and the dimension between the two points is measured from the calculated coordinates.
[0014]
By adopting such a configuration, a rectangular object whose dimensions are known is specified from the measured image displayed on the display, and, for example, when the coordinates of each vertex on the display are set, the rectangular shape is calculated from the coordinates. Can be calculated. If the diagonal can be calculated, the intersection of the two diagonals can also be calculated. If the intersection of the diagonal can be calculated, the coordinates of the intersection of the intersection with the side of the rectangle can also be calculated. The length of the intersection of the diagonal and the intersection of the diagonal is calculated to set the scale in the X-axis direction and the Y-axis direction. The actual size of the length of the intersection can be calculated from the ratio because the height and width of the rectangle are known. Therefore, if this scale is extended or reduced, the length to any coordinate can be calculated. Therefore, the coordinates between two designated points of the image are calculated from the reference point, and the dimension between the two points is calculated based on the calculated coordinates. Can be measured.
[0015]
At this time, a rectangular object whose height and width are known is printed on the image, and the copied rectangular object is selected from the image displayed on the display and set, and the coordinates of the set rectangle are set. The intersection of the diagonal line of the rectangle is calculated based on the coordinates of the intersection, and the scale of the X-axis and the Y-axis directions on the image is obtained based on the height and the width of the rectangle from the reference point using the coordinates of the calculated intersection as a reference point. It is possible to adopt a configuration in which the coordinates between two points on the image specified from the reference point are calculated with the obtained scale, and the dimension between the two points is measured from the calculated coordinates.
[0016]
By adopting such a configuration, if a rectangular shape whose height and width are known is imprinted on the image, the imprinted rectangular shape is designated on the display, for example, the coordinates of each vertex Is set, the diagonal of the rectangle is calculated from the coordinates, the intersection of the diagonal is calculated, the coordinates of the intersection of the rectangle and the sides of the rectangle are calculated, and the X-axis direction is calculated from the intersection of the intersection and the intersection of the diagonal. And the scale in the Y-axis direction can be set. The actual size of the length of the intersection can be calculated from the ratio because the height and width of the rectangle are known. If this scale is extended or reduced, the length of arbitrary coordinates is calculated, the coordinates between two points of the specified image to be measured are calculated from the reference point, and the dimension between the two points is measured from the calculated coordinates. be able to.
[0017]
Further, at this time, it is assumed that the image or the image and the rectangle taken by a digital camera are captured and displayed on a display, and a rectangular shape having a known height and width is determined from the displayed image. When selected and set, an intersection of the diagonal of the rectangle is calculated based on the coordinates of the set rectangle, and the coordinates of the calculated intersection are used as a reference point, and an image is formed based on the height and width of the rectangle from the reference point. A configuration in which a scale in the X-axis and Y-axis directions above is obtained, coordinates between two points on the image specified from the reference point are calculated with the obtained scale, and a dimension between the two points is measured from the calculated coordinates. Can be adopted.
[0018]
By adopting such a configuration, if an image captured by a digital camera is captured, dimensions in the image can be easily measured.
[0019]
Further, at this time, when an area surrounded by the line segment of the image is designated, a configuration is adopted in which the dimension of the designated line segment is measured, and the area surrounded by the line segment is calculated. be able to.
[0020]
By adopting such a configuration, it is possible to calculate the dimension of the line segment of the X axis and the Y axis, so that the area can be calculated.
[0021]
At this time, a rectangle for inclination correction is set in the image, and based on the set rectangle for inclination correction, the inclination of the rectangular shape whose height and width dimensions are known is corrected, A reference point is calculated from the corrected rectangle, and the scales in the X-axis direction and the Y-axis direction are calculated based on the height and width dimensions of the corrected rectangle from the calculated reference point, and the scale is used to specify the reference point. It is possible to adopt a configuration in which coordinates between two points on the obtained image are calculated, and a dimension between the two points is measured from the calculated coordinates.
[0022]
By adopting such a configuration, the image displayed on the screen is a planar image. Therefore, when the displayed image is a three-dimensional image, the image at the back is displayed as being inclined and shorter than the image at the front. Therefore, similarly, if the reference rectangle S is adjusted to the inclination of the measurement image, the occurrence of errors should be reduced.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, this embodiment can be constituted by a personal computer (personal computer) 1 in which a program of the present invention is installed, and a digital camera 2 for photographing and imaging an object to be measured.
[0024]
The personal computer 1 has an interface with the digital camera 2 described above, and the processing itself is not an advanced processing as described later, so that a high-spec one is not required. Therefore, it is possible to use a standard commercially available personal computer having a display with a resolution of 800 × 600 dots or more.
[0025]
The digital camera 2 has a resolution enough to identify a subject to be measured and a rectangle (set) S in the subject, and does not require a higher resolution. Further, any commercially-available standard file may be used as long as it can output an image file in a format (here, JPEG format) that can read the processing program installed in the personal computer 1.
[0026]
Hereinafter, the measurement method of the present invention will be described by describing the processing of the program.
[0027]
This measurement method measures the size of a subject from an image. In order to input an image of the subject (measurement target) to the personal computer 1, here, data obtained by photographing the measurement target using the digital camera 2 is used. I decided to take it directly to. In this case, the affinity between the two is good, so that the captured image can be easily captured. However, the present invention is not limited to this. For example, the image captured on photographic paper may be captured by a scanner.
[0028]
At this time, as shown in FIG. 2, it is better to take a picture of the face to be measured from the front as much as possible, as described later, when the reference rectangle S is set, the shape is less deformed, and the reference far point V1, Since V2 can be taken far away, measurement accuracy can be improved. For example, as shown in FIG. 2, when measuring the plane A, the figure (a) is better, and when measuring the plane B, the figure (b) is less likely to lose accuracy.
In addition, if the reference rectangle S is set as large as possible, the accuracy is less likely to decrease. For example, the accuracy can be improved in (a) than in (b) in FIG.
By the way, for example, when (a) and (b) are about the same size, it is more suitable for the reference rectangle S to be farther from the later-described far points V1 and V2.
[0029]
Images captured from the digital camera 2 are stored in the personal computer 1. The saved image is displayed on the viewer W as shown in FIG. 2 when "opened" by the activated program. The viewer W has an edit function and a display function setting menu as shown in FIG. 3 used for measurement. For measurement, first, as shown in FIG. "Set" is selected, and a reference rectangle S for correcting the inclination and ratio in the image is set.
[0030]
That is, as shown in FIG. 4, a rectangle (reference rectangle) S whose size is known in the image is selected and designated. Here, since the object to be measured is a building, a sash f whose dimensions are known is specified. At this time, the sash f is generally measured, but some sashes f have dimensional standards. In this case, if the product number is known, there is no need for actual measurement, so the dimensions of the building are measured. It is convenient in the case. In addition, since it is mounted on the same surface as the wall surface of the building, it is convenient to measure the dimensions of the building because accurate calculations can be performed (as will be described later, using X and Y coordinates (two-dimensional)).
[0031]
For this designation, the program allows a pointing device to be used. In this case, if the four corners of the sash f are pointed using a mouse as shown in FIGS. S can be specified.
[0032]
When the designation of the reference rectangle S is completed, the dimensions of the reference rectangle S are input. As for the input of dimensions, width and height dimensions are entered in a text box t of the viewer W as shown in FIG.
[0033]
Now that the measurement is ready, the dimension l between the two points can be measured. For the measurement of the dimension l, as shown in FIG. 6, "calculate the distance between two points" is selected from the "edit" menu. Next, as shown in FIG. 7, when two points on the image are clicked with the mouse (in any order), an actual dimension l between the two points is calculated based on the reference rectangle S and the measured value of the reference rectangle S. .
[0034]
In this calculation method, as shown in FIGS. 8 to 10, a reference point C0 is set at the center of gravity of the reference rectangle S, and the coordinates of the point set on the image by clicking with the mouse from the reference point C0 are determined. Calculate dimensions, distance, area, etc. from the coordinates.
[0035]
That is, as shown in FIG. 8A, in order to provide the reference rectangle S on the plane and obtain the coordinates of the point PP in the plane, as shown in FIG. The far points (extinguishing points) V1 and V2 intersecting with each other are obtained.
[0036]
More specifically, if the vertices of the reference rectangle S are, for example, a (x1, y1), b (x2, y2), c (x3, y3), and d (x4, y4), V1 (x, y) Since the coordinates are the intersection of the straight lines ab and cd,
The equation for the straight line ab is
(X-x1) / (x2-x1) = (y-y1) / (y2-y1)
The equation for the straight line cd is
(X−x3) / (x4−x3) = (y−y3) / (y4−y3)
It can be derived by solving the simultaneous equations of these two straight lines. However, if the two straight lines are parallel, there is no solution of the simultaneous equations, so the position of V1 is set to an infinite position from the reference rectangle.
Similarly, the coordinates of V2 can be derived.
[0037]
The calculation accuracy of the far points V1 and V2 decreases as the distance to the reference rectangle S decreases (the error at the far points V1 and V2 is infinite).
Therefore, when the deformation is large (far points V1 and V2 are close to the image), it is more difficult to reduce the accuracy by taking an image so that the reference rectangle S can be provided as far as possible from the far points V1 and V2. Also, in order to keep the far points V1 and V2 as far away from the image as possible, as described above, the far points V1 and V2 can be obtained by photographing from the front (directly) so that the depth angle is not as large as possible with respect to the surface during photographing. Can be kept away (∞ in the actual program).
[0038]
Next, as shown in FIG. 3C, two diagonal lines connecting the vertices abcd of the reference rectangle S are obtained, and the intersection of the diagonal lines is set to the reference point C0 (in this case, the straight line ac and the straight line bd are set). Think about the intersection (= solution).)
[0039]
Then, as shown in FIG. 9A, considering a straight line passing through the reference point C0 and the far point V2, intersections of the straight line and the sides of the reference rectangle S are defined as P1 and P2. Therefore, the reference point (the intersection of the diagonal lines) C0 needs to be within the rectangle S, and the shape of the rectangle S is preferably two adjacent corners> 180 °.
[0040]
Similarly, considering a straight line passing through the reference point C0 and the far point V1, an intersection C1 between the straight line and the side of the reference rectangle S is obtained as shown in FIG. Then, an intersection P3 between the straight line passing through C1 and P1 and the straight line passing through V1 and P2 is obtained.
[0041]
Further, an intersection P4 between a straight line passing through P2 and C1 and a straight line passing through V1 and P1 is obtained, and as shown in FIG. 4C, an intersection C2 between a straight line passing through V1 and C0 and a straight line passing through V2 and P3 is obtained. Ask for.
[0042]
Further, as shown in FIG. 10A, the intersection of a straight line passing through a and C2 and a straight line passing through V1 and d is defined as P5, and an intersection between a straight line passing through d and C2 and a straight line passing through V1 and a is taken. Is P6. Next, an intersection C3 between a straight line passing through V1 and C0 and a straight line passing through V2 and P6 is determined.
[0043]
At this time, as shown in FIG. 7B, the coordinates PP surrounded by the intersections C0, V2, and C3 exist inside ∠C2V2C3.
Also, lengths C0 to C1 = C1 to C2
= C2-C3
= "Width of reference rectangle W / 2 (scale)" (W / 2 in this embodiment, but not W / 2 depending on the shape of the rectangle, in which case it is obtained from the coordinates of each vertex)
Therefore, if C0 is the origin (0, 0), the coordinate of the point PP on the X axis is in the minus direction.
− (Reference rectangle width W / 2) × 2− (reference rectangle width W / 2) × 3
Between.
[0044]
In this case, since the error is large, the section between C2 and C3 is further divided as shown in FIG. Therefore, a diagonal line is provided in the rectangle of P4, P3, P6, and P5, and the intersection C4 is obtained. At this time, the coordinate PP exists inside ∠C2V2C4 surrounded by the intersections C2, V2, and C4.
[0045]
Also,
C2 to C4 = “width of reference rectangle W / 4”
It is. Therefore, the X coordinate of PP is
− (Reference rectangle width W / 2) × 2− (reference rectangle width W / 2) × 2
~-(Reference rectangle width W / 4)
Exists in the section.
The division is repeated until (the width W / n of the reference rectangle) becomes 1 or less, and the distance from C0 is obtained, whereby the X coordinate of the point PP can be calculated.
[0046]
Similarly, when the Y coordinate of the point PP is obtained using the far point V1, the X coordinate and the Y coordinate of the PP can be calculated.
[0047]
In this way, the coordinates of an arbitrary point on the image can be obtained. Therefore, if the coordinates of the above two points are obtained by this method, the distance (dimension) between the coordinates can be calculated. Therefore, if the point to be measured in the measurement image is designated by the mouse as described above, the dimension can be calculated.
[0048]
Further, since the dimension between the two points can be measured in this way, the area surrounded by the specified straight line between the two points can also be calculated.
[0049]
The actual operation is performed by selecting “Calculate area” → “Add” in the “Edit” menu as shown in FIG. 11 and pointing the range with the mouse as shown in FIGS. 12 (a) to 12 (e). If the area is specified, the area range is determined, and the area h can be calculated from the length of the straight line in the vertical and horizontal directions for which the range is specified.
[0050]
At this time, as shown in FIG. 13, by selecting “Determine area” → “Subtract” in the “Edit” menu and specifying a range, the range specified by the mouse can be subtracted. For example, in the case of FIG. 14, the area h of only the wall can be calculated by subtracting the area of the sash f.
[0051]
To reset the area h, select "Determine area" → "Delete area" from the "Edit" menu and specify the area range with the mouse. “Delete all ranges” can delete all the set area ranges.
[0052]
As described above, since the size between two points can be obtained from one image, the area can be easily obtained.
[0053]
Here, the procedure for selecting a command by opening a pull-down menu from the menu has been described, but this application has a toolbar having the same command function (not shown), and clicking a button on this toolbar Can perform the same operation.
[0054]
FIG. 15 shows a second embodiment.
In this embodiment, for example, a standardized reference rectangle G is prepared as a reference rectangle (target) G whose dimensions have been determined in advance, and as shown in FIG. The dimension measurement is performed using the method described in the first embodiment by using the reference rectangle G that is included.
[0055]
In this case, since an accurate reference rectangle G can be used, measurement accuracy can be improved.
[0056]
At this time, if the reference rectangle G is provided on the same plane as the measurement surface, the accuracy can be improved.
[0057]
In this manner, XY coordinates based on the reference rectangles G and S are provided in one displayed image, and the height and width dimensions of the reference rectangles G and S from the reference point C0 are determined based on the X coordinates and the Y coordinates. A scale in the X-axis and Y-axis directions on the image based on the coordinates is set, coordinates between two points on the specified image from the reference point C0 are calculated using the set scale, and a point between the two points is calculated based on the calculated coordinates. Since the dimension l is measured, the dimension l and the area can be easily measured.
[0058]
FIG. 16 shows a third embodiment.
This embodiment reduces errors that occur depending on how the reference rectangles G and S are set.
[0059]
As a factor of the error, there is a difference between the reference rectangles G and S and the size of the object to be measured. That is, as the difference is larger, an error is more likely to occur. For example, there has been a case where an error of 300 mm is generated with respect to 7000 mm.
However, depending on the measurement object, there is a case where it is not possible to set the reference rectangles G and S having the optimal size to minimize the error.
[0060]
Therefore, a coordinate system (XY coordinates) provided on the screen by calculation using the reference rectangles G and S is considered.
Then, the measurement image displayed on the screen is a planar image, and when the measurement image is a three-dimensional image, the back image is displayed as being inclined and shorter than the front image.
At this time, if the difference between the reference rectangle S and the object to be measured is small, the reference rectangle S and the object to be measured have the same inclination, so that the error is small. However, if the difference is large, the difference between the inclinations is displayed as a measurement error. It is thought to be.
[0061]
Therefore, in order to consider the inclination of the measured image, the reference for the inclination and the reference for the dimension are determined separately.
Specifically, a rectangle that is considered as large as possible on the image is specified. For example, as shown in FIG. 16A, vertices that are considered to be rectangles (one having four right angles, in this case, an outline) in a building are sequentially pointed with a mouse. This was defined as a reference rectangle S1 for inclination correction.
[0062]
Next, the same standard as the reference rectangles S and G of the first embodiment or the second embodiment is used as the dimension standard.
[0063]
The reference rectangles S and G are set, for example, as shown in FIG. 16B, when the lower sash is designated as the reference rectangle S, by clicking two opposite vertices, the reference rectangle S and each side are clicked. Is displayed as an extended dashed line. By doing so, the reference rectangle S and the reference rectangle S1 for inclination correction are made clear.
[0064]
When the reference rectangle S is set in this way, the width dimension and the height dimension of the set reference rectangle S are entered in a text box as shown in FIG. 17A, and the section to be measured as shown in FIG. Specify both ends with a mouse, etc.
[0065]
Then, the reference rectangle S is regarded as a similar shape to the reference rectangle S1 for inclination correction, and the angle of each vertex of the reference rectangle S becomes the same as the angle of each vertex of the corresponding reference rectangle S1 for inclination correction. To be corrected. At this time, the dimensions are changed with the correction of the angle, so the correction is made.
[0066]
The inclination of the reference rectangles G and S was corrected by such a method, and the dimensions of the measurement image were measured by the method described in the first embodiment using the corrected reference rectangles G and S.
That is, the far points V1 and V2 and the reference point C0 were obtained from the reference rectangles G and S, and the scales in the X-axis and Y-axis directions were obtained based on the dimensions of the reference rectangle S from the reference point C0. Then, the dimensions of the measurement image were measured on the scale.
As a result, the measurement error could be kept within 4%, and it was confirmed that this method was effective.
[0067]
Also, as shown in FIG. 18, by clicking two opposite vertexes of the entire outer wall, if the area h of the entire outer wall can be calculated, for example, the menu “Edit” → “Calculate area” → “Subtract” When "Yes" is selected and the sash to be subtracted is designated with a mouse, the area of only the wall surface can be calculated as in the first embodiment.
[0068]
【The invention's effect】
According to the present invention, as described above, the dimensions can be measured from a single image by a simple process without requiring any special equipment.
[0069]
In addition, the processing can be performed only for the necessary part, so that the processing time can be reduced.
[0070]
In addition, there is no need to perform complicated operations during shooting.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment. FIG. 2 is an operation explanatory view of a first embodiment. FIG. 3 is an operation explanatory view of a first embodiment. FIG. 4 is an operation explanatory view of a first embodiment. FIG. 6 is a diagram illustrating the operation of the first embodiment. FIG. 7 is a diagram illustrating the operation of the first embodiment. FIG. 8 is a diagram illustrating the operation of the first embodiment. FIG. 10 is a diagram illustrating the operation of the first embodiment. FIG. 11 is a diagram illustrating the operation of the first embodiment. FIG. 12 is a diagram illustrating the operation of the first embodiment. FIG. 13 is a first embodiment. FIG. 14 is a diagram illustrating the operation of the first embodiment. FIG. 15 is a diagram illustrating the operation of the second embodiment. FIG. 16A and FIG. 16B are diagrams illustrating the operation of the third embodiment. (A), (b) Operation explanatory diagram of third embodiment [FIG. 18] Operation explanatory diagram of third embodiment [FIG. 19] (a), (b) Operation explanatory diagram of conventional example [FIG. A flowchart of a conventional example [Description of symbols]
1 PC 2 Digital camera C0 Reference point G Reference rectangle h Area l Dimension R Outline S Reference rectangle S1 Reference rectangle for inclination correction

Claims (5)

From the image displayed on the display, when selecting and setting a rectangular shape whose height and width are known, the intersection of the diagonal of the rectangle is calculated based on the coordinates of the set rectangle, and the calculated intersection of the intersection is calculated. Using the coordinates as a reference point, scales in the X-axis and Y-axis directions on the image are obtained from the reference point based on the height and width dimensions of the rectangle, and two points on the image specified from the reference point using the obtained scale. A method of measuring an image dimension, in which coordinates between the two points are calculated, and a dimension between two points is measured from the calculated coordinates. When a rectangular shape having a known height and width is printed on the image, and the copied rectangular shape is selected from the image displayed on the display and set, based on the coordinates of the set rectangle. The intersection of the diagonal lines of the rectangle is calculated, and the coordinates of the calculated intersection are used as a reference point, and the X-axis and Y-axis directions on the image are scaled from the reference point based on the height and width dimensions of the rectangle. The method according to claim 1, wherein coordinates between two points on the image specified from the reference point on the scale are calculated, and a dimension between the two points is measured from the calculated coordinates. It is assumed that the image or the image and a rectangle taken with a digital camera are captured and displayed on a display, and a rectangular shape having a known height and width is selected from the displayed image and set. Calculating the intersection of the diagonal lines of the rectangle based on the coordinates of the set rectangle, and using the coordinates of the calculated intersection as a reference point and the X axis on the image based on the height and width dimensions of the rectangle from the reference point. 3. The scale according to claim 1, wherein a scale in the Y-axis direction is obtained, coordinates between two points on the image specified from the reference point are calculated using the obtained scale, and a dimension between the two points is measured from the calculated coordinates. How to measure image dimensions. 4. The method according to claim 1, wherein, when an area surrounded by the line segment of the image is designated, a dimension of the designated line segment is measured, and an area surrounded by the line segment is calculated. How to measure the stated image dimensions. A rectangle for tilt correction is set in the image, and based on the set rectangle for tilt correction, the set height and width are corrected for the tilt of a known rectangular shape. A reference point is calculated, and scales in the X-axis direction and the Y-axis direction are obtained based on the height and width dimensions of the rectangle corrected from the calculated reference point. The method according to claim 1, wherein coordinates between two points are calculated, and a dimension between the two points is measured from the calculated coordinates.

Images