Aligning method of camera

Abstract

According to one embodiment, provided is an alignment method of a camera comprising a lens unit, and an image sensor disposed behind the lens unit, the method arranging a plurality of charts in which an object photographed in front of the lens unit is shown, and adjusting a first distance defined as the distance between the image sensor and the lens unit to set the state in which resolutions of the object shown in at least two charts among the plurality of charts match or are within a predetermined range as the position of the lens unit.

Description

How to align the camera

[0001] The present invention relates to a method for aligning a camera, and more particularly, to a method for aligning a camera for finding a resolution peak point of a captured image.

[0002] The material described in this section merely provides background information for the present invention and does not constitute prior art.

[0003] A camera may include a lens that faces the subject being photographed and an image sensor positioned behind the lens. During the camera assembly process, the distance between the lens and the image sensor is adjusted to obtain high-resolution images.

[0004] This resolution adjustment process is performed by moving the position of the lens relative to the image sensor to find the point where the resolution of the image of the subject being photographed reaches its peak, positioning the lens at this point, and fixing the distance between the lens and the image sensor.

[0005] Take pictures at each position while moving the lens, and compare the resolution of the captured images to find the peak point of resolution.

[0006] As the lens is moved in one direction to find the resolution peak point, the resolution of the captured image gradually increases and then decreases after the peak point is passed.

[0007] Since we don't know where the resolution peak is, we pass the peak and then realize that the resolution has decreased and move the lens back in the opposite direction.

[0008] It is common to find the resolution peak point through trial and error by repeating this process of moving the lens in one direction and then moving it in the opposite direction.

[0009] However, this method requires a lot of time and effort, as it involves repeatedly moving the lens in both directions. Consequently, the camera alignment process can be slow, making the entire camera assembly process time-consuming and costly.

[0010] Therefore, a solution to these problems is required.

[0011] An object of the present invention is to provide a camera alignment method capable of quickly finding a resolution peak point during a camera assembly process.

[0012] In addition, an object of the present invention is to provide a method for aligning a camera having a structure for determining a point where the resolution of an object depicted in a plurality of charts matches or is within a set range as the position of a lens unit.

[0013] The purposes of the present invention are not limited to those mentioned above. Other purposes and advantages of the present invention not mentioned above can be understood through the following description and will be more clearly understood through embodiments of the present invention. Furthermore, it will be readily apparent that the purposes and advantages of the present invention can be realized by the means and combinations thereof set forth in the claims.

[0014] One embodiment of a method for aligning a camera includes a lens unit; and an image sensor disposed at the rear of the lens unit, wherein a plurality of charts depicting objects to be photographed are disposed in front of the lens unit, and a first distance defined as a distance between the image sensor and the lens unit is adjusted so that a state in which the resolutions of objects depicted in at least two of the plurality of charts match or are within a set range can be set as the position of the lens unit.

[0015] The chart includes a reference chart that serves as a reference for positioning an image sensor at a point where the resolution of the depicted object is peak; a first chart positioned in front of the reference chart; and a second chart positioned behind the reference chart and in front of the lens unit, and a state in which the resolutions of the objects depicted in the first chart and the second chart match or are within a set range can be set as the position of the lens unit.

[0016] The distance between the resolution peak point of the reference chart and the resolution peak point of the first chart and the distance between the resolution peak point of the reference chart and the resolution peak point of the second chart may be identical to each other.

[0017] The resolution peak point of each chart may vary in location depending on the distance between the chart and the lens.

[0018] One embodiment of a method for aligning a camera may include the steps of: arranging a reference chart, a first chart, and a second chart at a set distance from an image sensor, respectively; adjusting the first distance by moving a lens unit; finding a position of the lens unit where the resolution of an object shown in the first chart and the second chart matches or is within a set range; and setting a position where the resolution matches or is within the set range as the position of the lens unit.

[0019] The reference chart, the first chart, and the second chart may be provided so that the target object is depicted on a transparent material, and the target object depicted on each chart may be all sensed by the image sensor.

[0020] When a plurality of objects are provided on each chart and each chart is aligned in front of the lens unit, the objects shown on each chart can be provided so that they are all sensed by the image sensor without overlapping each other.

[0021] Another embodiment of a method for aligning a camera includes a lens unit; and an image sensor disposed at the rear of the lens unit, wherein a reference chart is disposed at the front of the lens unit, a first chart is disposed at the front of the reference chart, a second chart is disposed at the rear of the reference chart, and a first distance defined as a distance between the image sensor and the lens unit is adjusted so that a state in which the resolution of an object depicted in two of three charts matches or is within a set range can be set as the position of the lens unit.

[0022] Another embodiment of a method for aligning a camera may include the steps of: arranging a reference chart, a first chart, and a second chart at a second distance set from an image sensor, respectively; adjusting the first distance by moving a lens unit; finding a position of the lens unit where the resolution of an object shown in the first chart and the second chart matches or is within a set range; and setting a position where the resolution matches or is within a set range as the position of the lens unit.

[0023] The position of the lens unit can be set so that the resolution of the object shown in the first and second charts matches or is within a set range.

[0024] The reference chart, the first chart, and the second chart may be provided so that the target object is depicted on a transparent material, and the target object depicted on each chart may be all sensed by the image sensor.

[0025] In the camera alignment method according to the present invention, the camera can be aligned by determining a point where the image resolutions of the objects in the first chart and the second chart are identical to each other or within a set range as the assembly position of the lens unit.

[0026] In this case, by moving the lens unit in either the forward or backward direction and finding a position where the resolution of the objects in the first and second charts match or are within a set range, the position of the lens unit corresponding to the resolution peak point of the reference chart can be found.

[0027] Therefore, compared to the case where the lens part moves back and forth multiple times in the forward and backward directions to find the resolution peak point of the reference chart through trial and error when there is only a reference chart, the alignment process time can be greatly shortened because the lens part does not need to move back and forth in one direction and the opposite direction.

[0028] Accordingly, the process cost for camera alignment can be significantly reduced.

[0029] In addition to the effects described above, specific effects of the present invention are described below while explaining specific details for carrying out the invention.

[0030] Figure 1 is a drawing showing the arrangement of each component to explain a method of aligning a camera according to one embodiment.

[0031] Figure 2 is a drawing showing charts according to an embodiment.

[0032] Figure 3 is a drawing showing a state in which the charts shown in Figure 2 are overlapped and captured by a camera.

[0033] Figure 4 is a drawing showing a method for finding the position of the lens section where the resolution of a general camera is maximized.

[0034] Figure 5 is a flowchart for explaining a camera alignment method according to an embodiment.

[0035] Figure 6 is a graph for explaining a camera alignment method according to an embodiment.

[0036] Figure 7 is a graph showing the difference in resolution between the first and second charts in Figure 6.

[0037] Figure 8 is a drawing showing a method for finding the position of the lens part where the resolution of the camera is maximized when the camera captures a reference chart in a camera alignment method according to an embodiment.

[0038] Figure 9 is a drawing showing charts according to other embodiments.

[0039] Figure 10 is a drawing showing a state in which the charts shown in Figure 9 are overlapped and captured by a camera.

[0040] The above-described objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can easily practice the technical ideas of the present invention. In describing the present invention, if a detailed description of a known technology related to the present invention is judged to unnecessarily obscure the gist of the present invention, a detailed description thereof will be omitted. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

[0041] Although terms like "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another, and unless otherwise specified, a "first" component may also be a "second" component.

[0042] Throughout the specification, unless otherwise specifically stated, each element may be singular or plural.

[0043] As used herein, singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as "consisting of" or "comprising" should not necessarily be construed to include all of the components or steps described in the specification, and should be construed to mean that some of the components or steps may not be included, or that additional components or steps may be included.

[0044] Throughout the specification, when we refer to "A and / or B", this means A, B, or A and B, unless otherwise stated, and when we refer to "C through D", this means C or more and D or less, unless otherwise stated.

[0045] In the specification, “front” means the side of the lens unit (100) facing the chart, and “rear” means the side of the lens unit (100) facing the image sensor (200).

[0046] Figure 1 is a drawing showing the arrangement of each component to explain a camera alignment method according to one embodiment. The camera may include a lens unit (100) and an image sensor (200).

[0047] The lens unit (100) may be provided so that a plurality of lenses are aligned in the same direction. For example, convex lenses, concave lenses, and flat lenses may be aligned in the lens unit (100) to form an optical system.

[0048] The image sensor (200) can be placed at the rear of the lens unit (100). The lens unit (100) faces the object to be photographed, and light passing through the lens unit (100) reaches the image sensor (200), so that the image sensor (200) can sense the image of the object.

[0049] The image sensed by the image sensor (200) can be displayed on a display electrically connected to the camera or stored in a storage device.

[0050] The camera alignment method according to the embodiment is to fix the position of the image sensor (200) and move the lens unit (100) to find the resolution peak point where the resolution of the image to be captured is maximum, and to determine the position of the lens unit (100) corresponding to the resolution peak point as the assembly position of the lens unit (100).

[0051] This can be done as part of the camera assembly process. The lens unit (100) can move forward or backward to find the resolution peak point.

[0052] In order to find the resolution peak point in the embodiment, a plurality of charts depicting a subject (10) to be photographed can be placed in front of the lens unit (100). By adjusting the first distance (D1) defined as the distance between the image sensor (200) and the lens unit (100), the position of the lens unit (100) can be set so that the resolution of the subject (10) depicted in at least two charts among the plurality of charts matches or is within a set range.

[0053] For example, three charts depicting a subject (10) to be photographed can be placed in front of the lens unit (100). The three charts can be placed at positions spaced apart from each other in the front-back direction.

[0054] When aligning the camera, the positions of the image sensor (200) and each chart can be fixed, and the lens unit (100) can be moved forward and backward using the equipment to find the resolution peak point of the image being captured.

[0055] The chart is formed in a plate shape in which an object (10) sensed by an image sensor (200) is depicted, and the lens unit (100) can be positioned to face the object (10). Accordingly, the image sensor (200) positioned behind the lens unit (100) can sense the object (10) and capture an image. The chart may include a reference chart (300), a first chart (310), and a second chart (320).

[0056] The reference chart (300) can be a reference for positioning the lens unit (100) at the point where the resolution of the depicted object (10) is at its peak.

[0057] By moving the lens unit (100) in the forward and backward direction, the position of the lens unit (100) that becomes the resolution peak point of the target object (10) shown in the reference chart (300) can be determined as the assembly position of the lens unit (100).

[0058] The first chart (310) is placed in front of the reference chart (300) and the target object (10) can be depicted. The second chart (320) is placed behind the reference chart (300), in front of the lens unit (100), and the target object (10) can be depicted.

[0059] Accordingly, the reference chart (300) can be placed in front of the lens unit (100), the first chart (310) can be placed in front of the reference chart (300), and the second chart (320) can be placed behind the reference chart (300).

[0060] The distance between the image sensor (200) and the lens unit (100) is defined as a first distance (D1), and the resolution peak point of the target object (10) can be found by adjusting the first distance (D1). More specifically, the first distance (D1) can be defined as the distance from the front of the image sensor (200) having a thickness to the set point (P1) of the lens unit (100).

[0061] Meanwhile, the distance from the lens unit (100) to each chart may be defined as a second distance (D2). More specifically, the second distance (D2) may be defined as the distance from the set point (P1) of the lens unit (100) to the rear surface of the chart having a thickness.

[0062] Additionally, the total distance (D1+D2), which is the sum of the first distance (D1) and the second distance (D2), can be set by considering the performance and specifications of the camera.

[0063] The camera alignment process described in the example is to align the camera based on an object at a total distance (D1+D2) from the image sensor (200), and in particular, to find the position of the lens unit (100) corresponding to the resolution peak point at the total distance (D1+D2) of the reference chart (300).

[0064] During the camera alignment process, the total distance (D1+D2) in each chart can be fixed. For example, according to the design values ​​of the illustrated camera, the total distance (D1+D2) may be 40 cm. This is an example value and is not limited to this, and the total distance (D1+D2) may vary depending on the camera design values.

[0065] However, for the sake of clarity, the following description will describe a camera designed with a total distance (D1+D2) of 40 cm on the reference chart (300) that serves as the basis for camera alignment, unless otherwise specified.

[0066] Of course, when the lens unit (100) moves forward and backward during the camera dynamic process, the first distance (D1) and the second distance (D2) may change, but the total distance (D1+D2) is constant regardless of the movement of the lens unit (100).

[0067] Meanwhile, when the resolutions of the objects (10) of the first chart (310) and the second chart (320) are the same, it is necessary to determine the total distance (D1+D2) of the first chart (310) and the total distance (D1+D2) of the second chart (320) so that the object (10) of the reference chart (300) is located at the resolution peak point. This can be determined based on experimentally acquired data.

[0068] For example, if the total distance (D1+D2) of the reference chart (300) is 40 cm, the total distance (D1+D2) of the first chart (310) can be set to 50 cm, and the total distance (D1+D2) of the second chart (320) can be set to 34 cm.

[0069] Fig. 2 is a drawing showing charts according to an embodiment. Fig. 3 is a drawing showing a state in which the charts shown in Fig. 2 are overlapped and captured by a camera.

[0070] As illustrated in Figure 1, each chart can be positioned spaced apart from one another in the front-back direction in front of the lens. However, for clarity, each chart is arranged on the same plane in Figure 2.

[0071] Each chart may be formed into a plate shape with a predetermined thickness. The reference chart (300), the first chart (310), and the second chart (320) may be provided with a transparent material on which the target object (10) is depicted. The target object (10) may be depicted in an opaque printed form on each transparent chart.

[0072] The pattern of the object (10) is formed in a square shape, but is not limited thereto and may be transformed into various patterns.

[0073] The objects (10) depicted in each chart can be provided so that they are all sensed by the image sensor (200). That is, when the charts are overlapped in the forward and backward directions, the objects (10) can be spaced apart from each other in a direction intersecting the forward and backward directions.

[0074] Therefore, when the camera looks at the charts in the front-back direction, the objects (10) shown in each chart can all be sensed by the image sensor (200) without overlapping each other.

[0075] Meanwhile, each chart may be provided with an area that increases the farther away from the lens unit (100) the camera is from the lens unit (100), considering that the charts are captured smaller the farther away from the lens unit (100) the camera is from the lens unit (100). Similarly, the objects (10) depicted in each chart may also be provided with an area that increases the farther away from the lens unit (100).

[0076] Therefore, as shown in Fig. 3, when the camera captures each chart overlapping in the front-back direction, the sizes of each chart and the target object (10) may appear to be generally similar.

[0077] Fig. 4 is a drawing showing a method for finding the position of the lens unit (100) at which the resolution of a general camera is maximized. In the graphs of Fig. 4 and Fig. 6 below, the vertical axis represents the resolution of the image captured by the image sensor (200).

[0078] Resolution has a value from 0 to 1, and the closer it is to 1, the higher the resolution. However, 1 is a theoretical value, and the resolution of an actual object (10) may be lower than 1.

[0079] In addition, in the graphs of FIGS. 4 and 6, the horizontal axis represents the distance the lens unit (100) moves in the forward and backward directions, and the unit is mm. The numbers on the horizontal axis set the reference point to 0 when the lens unit (100) is located at the resolution peak point, and indicate a - value when moving backward from the reference point, and a + value when moving forward from the reference point.

[0080] In Fig. 4, a method for finding the position of the lens unit (100) can be described when there is only a reference chart (300) without the first chart (310) and the second chart (320).

[0081] Referring to Fig. 4, when the lens unit (100) is moved forward and backward while the total distance (D1+D2) is fixed to adjust the first distance (D1), it can be seen that the resolution of the image captured changes depending on the position of the lens unit (100) and that a resolution peak point exists.

[0082] Alignment of the camera involves moving the lens unit (100) forward and backward to find the position of the lens unit (100) that becomes the resolution peak point.

[0083] To find the resolution peak point, the lens unit (100) can be moved forward from one point. At this time, the resolution of the image of the photographed object (10) gradually increases and then decreases after the peak point is passed.

[0084] Since we do not know where the resolution peak point is, we pass the peak point and reach point 2, and then, knowing that the resolution has decreased, we move the lens unit (100) in the opposite direction, that is, backwards, to reach point 3, which is the resolution peak point.

[0085] By repeating the process of moving the lens unit (100) in one direction and then moving it in the opposite direction, the resolution peak point can be found through trial and error. In Fig. 4, the resolution peak point is found through one forward movement and one backward movement, but in reality, the forward and backward movements may be repeated multiple times.

[0086] However, this method requires a lot of time and effort, as it involves repeatedly moving the lens unit (100) in one direction and the opposite direction multiple times. Consequently, the camera alignment process can be slowed down, making the entire camera assembly process time-consuming and costly. Below, a camera alignment method that addresses these issues will be described in detail.

[0087] Fig. 5 is a flowchart illustrating a camera alignment method according to an embodiment. Fig. 6 is a graph illustrating a camera alignment method according to an embodiment. Fig. 7 is a graph illustrating the difference in resolution between the first chart (310) and the second chart (320) in Fig. 6.

[0088] In Fig. 6, a resolution graph is shown when the total distance (D1+D2) of the reference chart (300) is 40 cm, the total distance (D1+D2) of the first chart (310) is 40 cm, and the total distance (D1+D2) of the second chart (320) is 34 cm.

[0089] As illustrated in Fig. 6, the resolution peak point of each chart may change location depending on the distance between the chart and the image sensor (200), i.e., the total distance (D1+D2). In Fig. 6, the graph with the resolution peak point in the center is a resolution graph of the reference chart (300) according to the movement of the lens unit (100).

[0090] The resolution graph of the first chart (310) according to the movement of the lens unit (100) has the resolution peak point shown to the left of the reference chart (300), and the resolution graph of the second chart (320) according to the movement of the lens unit (100) has the resolution peak point shown to the right of the reference chart (300).

[0091] The distance between the resolution peak point of the reference chart (300) and the resolution peak point of the first chart (310) and the distance between the resolution peak point of the reference chart (300) and the resolution peak point of the second chart (320) may be identical to each other.

[0092] That is, the resolution peak point of the first chart (310) and the resolution peak point of the second chart (320) can be arranged at positions symmetrical to each other on the horizontal axis based on the resolution peak point of the reference chart (300).

[0093] In an embodiment, the first distance (D1) defined as the distance between the image sensor (200) and the lens unit (100) can be adjusted so that the resolution of the object (10) shown in two of the three charts matches or is within a set range, and the position of the lens unit (100) can be set.

[0094] That is, the position of the lens unit (100) can be set such that the resolution of the object (10) shown in the first chart (310) and the second chart (320) match or are within a set range.

[0095] As described above, the resolution peak points of the first chart (310) and the second chart (320) can be symmetrical with respect to the resolution peak point of the reference chart (300). Due to this geometric shape, when the lens unit (100) is positioned at the resolution peak point of the reference chart (300), the resolutions of the respective objects (10) of the first chart (310) and the second chart (320) can be matched with each other.

[0096] Here, "resolution matching" does not necessarily mean the resolution is identical, but rather includes being very similar within a given range. Therefore, if the resolution is within a set range, the position of the lens unit (100) at that time can be the assembly position. This set range can be appropriately selected.

[0097] Based on these facts, the resolution of each target (10) of the first chart (310) and the second chart (320) can be matched or the position within the set range can be found, and the position of the lens unit (100) corresponding thereto can be determined as the assembly position of the lens unit (100).

[0098] Looking at Figure 6, it can be seen that the graphs of the first chart (310) and the second chart (320) intersect each other at the resolution peak point of the reference chart (300), and the point of intersection is where the resolutions of the objects (10) of the first chart (310) and the second chart (320) match.

[0099] Meanwhile, in FIG. 7, the value obtained by subtracting the resolution of the second chart (320) from the resolution of the first chart (310) is shown in a graph. The point where this value is 0 is where the resolutions of the objects (10) of the first chart (310) and the second chart (320) match each other, and may be the position of the lens unit (100) corresponding to the resolution peak point of the reference chart (300).

[0100] Accordingly, the camera can be aligned by determining the assembly position of the lens unit (100) at a point where the image resolutions of the object (10) of the first chart (310) and the second chart (320) match each other or are within a set range.

[0101] In this case, by moving the lens unit (100) in either the forward or backward direction and finding only the position where the resolution of the object (10) of the first chart (310) and the second chart (320) match, the position of the lens unit (100) corresponding to the resolution peak point of the reference chart (300) can be found.

[0102] Therefore, compared to the case where only the reference chart (300) is present and the lens unit (100) moves back and forth multiple times in the forward and backward directions to find the resolution peak point of the reference chart (300) through trial and error, the alignment process time can be greatly shortened because the lens unit (100) does not need to move back and forth in one direction and the opposite direction.

[0103] Accordingly, the process cost for camera alignment can be significantly reduced.

[0104] Referring to Fig. 5, each process of a camera alignment method according to an embodiment is sequentially described.

[0105] First, the reference chart (300), the first chart (310), and the second chart (320) can be placed at a total distance (D1+D2), which is a set distance from the image sensor (200) (S110). The total distance (D1+D2) can be set differently for each chart.

[0106] As described above, the total distance (D1+D2) of the first chart (310) and the second chart (320) can be set based on the total distance (D1+D2) of the reference chart (300).

[0107] That is, the total distance (D1+D2) of the first chart (310) and the second chart (320) can be set so that the resolution peak point of the first chart (310) and the resolution peak point of the second chart (320) are positioned symmetrically on the horizontal axis of the graph based on the resolution peak point of the reference chart (300). This can be determined based on experimentally acquired data.

[0108] The operator can adjust the first distance (D1) by moving the lens unit (100) using the alignment device (S120).

[0109] The position of the lens unit (100) can be found when the resolution of the object (10) depicted in the first chart (310) and the second chart (320) match or is within a set range (S130). At this time, the lens unit (100) can be moved in either the forward or backward direction, and there is no need to go through a trial and error process of moving it back and forth.

[0110] Finally, the position of the lens unit (100) can be set to a location where the resolution matches or is within a set range (S140). Accordingly, the position of the lens unit (100) in the camera can be determined.

[0111] Afterwards, the position of the lens unit (100) can be fixed and other work can be performed to complete the camera assembly process.

[0112] FIG. 8 is a drawing showing a method for finding the position of the lens unit (100) at which the resolution of the camera is maximized when the camera captures a reference chart (300) in a camera alignment method according to an embodiment.

[0113] First, the lens unit (100) can be placed at an appropriate starting point in front of the image sensor (200) and the lens unit (100) can be moved in either the forward or backward direction. By moving the lens unit (100), the resolution of each object (10) sensed by the image sensor (200) and displayed on a display device electrically connected to the camera can be examined.

[0114] At the initial stage of movement of the lens unit (100), the resolution of the object (10) of the first chart (310) and the second chart (320) may be different from each other, as shown in (A) of Fig. 8. In this case, the lens unit (100) has not yet reached the resolution peak point.

[0115] By continuously moving the lens unit (100), the resolutions of the first chart (310) and the second chart (320) can be matched as shown in (B) of Fig. 8. The position of the lens unit (100) corresponding to this matching point can become the resolution peak point of the image when the camera captures the image.

[0116] Accordingly, when the image shown in (B) of Fig. 8 appears, the movement of the lens unit (100) can be stopped, and the position at this time can be determined as the position of the lens unit (100).

[0117] Meanwhile, as another example, two charts depicting a subject (10) to be photographed may be placed in front of the lens unit (100). In this case, the aforementioned reference chart (300) may be omitted, and only the first chart (310) and the second chart (320) may be placed in front of the lens unit (100).

[0118] In this case, the target object (10) of the reference chart (300) is not captured by the image sensor (200), and the resolution of the target object (10) of the first chart (310) and the second chart (320) is the same, or the position of the lens unit (100) corresponding to the position within the set range can be found and used as the assembly position of the lens unit (100).

[0119] In addition, as another embodiment, four or more charts depicting a subject (10) to be photographed may be placed in front of the lens unit (100). In this case, the resolution of the subject (10) of at least two charts among the four or more charts may be the same, or the position of the lens unit (100) corresponding to a position within a set range may be found, and this may be used as the assembly position of the lens unit (100).

[0120] Fig. 9 is a drawing showing charts according to another embodiment. Fig. 10 is a drawing showing a state in which the charts shown in Fig. 9 are overlapped and captured by a camera.

[0121] A plurality of objects (10) may be provided on each chart. In this case, it may be appropriate to provide two objects (10). This is because if three or more objects (10) are provided, the objects (10) may overlap each other in the forward and backward directions of the camera.

[0122] At this time, the objects (10) of each chart can be placed at appropriate locations spaced apart from each other so that the charts do not overlap each other when they overlap in the front-back direction.

[0123] Accordingly, as illustrated in FIG. 10, when each chart is aligned in front of the lens unit (100), the objects (10) illustrated in each chart can be provided so that they are all sensed by the image sensor (200) without overlapping each other.

[0124] For example, a total of six objects (10), two for each chart, can be sensed by the image sensor (200). In this case, a total of four objects (10) can be sensed by the image sensor (200) by combining the first chart (310) and the second chart (320).

[0125] Accordingly, since the resolution peak point of the reference chart (300) can be found by finding a point where the resolution of a total of four target (10) images matches or is within a set range, the position of the lens unit (100) corresponding to the resolution peak point can be set with much more precision and accuracy compared to finding the resolution peak point with two target (10) images.

[0126] Although the present invention has been described with reference to the drawings exemplified above, it is to be understood that the present invention is not limited to the embodiments and drawings disclosed herein, and that various modifications may be made by those skilled in the art within the scope of the technical idea of ​​the present invention. Furthermore, even if the operational effects according to the configuration of the present invention have not been explicitly described while describing the embodiments of the present invention, it is natural that the effects predictable by the corresponding configuration should also be acknowledged.

Claims

1. Lens section; and Image sensor placed at the rear of the above lens unit In a method of aligning a camera including: A plurality of charts depicting objects to be photographed are placed in front of the lens unit, By adjusting the first distance defined as the distance between the image sensor and the lens unit, the resolution of the object shown in at least two of the plurality of charts is set to the position of the lens unit so that it matches or is within a set range. How to align the camera.

2. In paragraph 1, The above chart, A reference chart that serves as a reference for positioning the image sensor at the point where the resolution of the depicted object is peak; A first chart placed in front of the above reference chart; and A second chart placed behind the above reference chart and in front of the lens unit Including, Setting the position of the lens unit to a state where the resolution of the object shown in the first chart and the second chart matches or is within a set range, How to align the camera.

3. In paragraph 2, The distance between the resolution peak point of the above reference chart and the resolution peak point of the first chart and the distance between the resolution peak point of the above reference chart and the resolution peak point of the second chart are identical to each other. How to align the camera.

4. In paragraph 3, The resolution peak point of each chart changes location depending on the distance between the chart and the lens unit. How to align the camera.

5. In paragraph 3, A step of placing the above reference chart, the first chart and the second chart at a set distance from the image sensor, respectively; A step of adjusting the first distance by moving the lens unit; A step of finding a position of the lens unit where the resolution of the object shown in the first chart and the second chart matches or is within a set range; and A step of setting the position of the lens unit to a position that matches the resolution or is within a set range. including, How to align the camera.

6. In paragraph 2, The above reference chart, the first chart and the second chart, The object is provided to be depicted on a transparent material, and the object depicted on each chart is provided to be sensed by the image sensor. How to align the camera.

7. In paragraph 6, The above objects are provided in multiples on each chart, When each chart is aligned in front of the lens unit, the objects depicted in each chart are provided so that they are all sensed by the image sensor without overlapping each other. How to align the camera.

8. Lens section; and Image sensor placed at the rear of the above lens unit In a method of aligning a camera including: A reference chart is placed in front of the lens section, a first chart is placed in front of the reference chart, and a second chart is placed behind the reference chart. By adjusting the first distance defined as the distance between the image sensor and the lens unit, the resolution of the object shown in two of the three charts is matched, or the state within the set range is set as the position of the lens unit. How to align the camera.

9. In paragraph 8, A step of placing the above reference chart, the first chart and the second chart at a set distance from the image sensor, respectively; A step of adjusting the first distance by moving the lens unit; A step of finding a position of the lens unit where the resolution of the object shown in the first chart and the second chart matches or is within a set range; and A step of setting the position of the lens unit to a position that matches the resolution or is within a set range. including, How to align the camera.

10. In paragraph 8, The position of the lens unit is set such that the resolution of the object shown in the first chart and the second chart matches or is within a set range. How to align the camera.

11. In paragraph 8, The above reference chart, the first chart and the second chart, The object is provided to be depicted on a transparent material, and the object depicted on each chart is provided to be sensed by the image sensor. How to align the camera.

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