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EP-4113057-B1 - METHOD OF SETTING SCAN REGION

EP4113057B1EP 4113057 B1EP4113057 B1EP 4113057B1EP-4113057-B1

Inventors

  • KIM, JIN YOUNG
  • KIM, JIN SU

Dates

Publication Date
20260506
Application Date
20220627

Claims (6)

  1. A method of setting a scan region, the method comprising: placing (S110) a target object (O) on an upper surface of a jig (913) of a 3-three-dimensional scanner (910) in such a manner that at least one portion of a target object image (100) representing a shape of the target object (O) is plotted on an input region (500); aligning (S120), by the control unit (920), the target object (O) in such a manner that the target object image (100) is plotted at a predetermined point on the input region (500); determining (S130), by a control unit (920), a predetermined upper portion of the input region (500), as a scan region (530), from a jig image (200) representing the shape of the jig (913); and generating (S140), by the control unit (920), a three-dimensional model of the target object (O) on the basis of the target object image (100) resulting from scanning the scan region (530); wherein the scan region (530) is a portion of the input region (500) that has a Y-axis coordinate which has the same or higher value compared with the Y-axis coordinate of a jig image upper end (201, 211, 221), wherein in the determining by the control unit (920) of the predetermined upper portion of the input region (500) as the scan region (530), the scan region (530) is determined on the basis of a distance (m) that the jig (913) is moved in the aligning by the control unit (920) of the target object (O).
  2. The method of claim 1, wherein the determining by the control unit (920) of the predetermined upper portion of the input region (500) as the scan region (530) comprises: acquiring (S131) the distance (m) that the jig (913) is moved in the aligning by the control unit (920) of the target object (O); acquiring (S132) coordinates of the jig image (200) by computing a distance that the jig image (200) is moved on the input region (500) in a manner that corresponds to the distance (m) of movement of the jig (913); and designating (S133) the scan region (530) from the coordinates of the jig image (200).
  3. The method of claim 2, wherein the coordinates of the jig image (200) are acquired by adding the distance of movement on the input region (500), which is computed in the acquiring of the coordinates of the jig image (200), to initial coordinates of the jig (913) that correspond to an initial position of the jig (913) that is preset in the placing (S110) of the target object (O).
  4. The method of any one of claims 1, 2 and 3, wherein the aligning by the control unit (920) of the target object (O) comprises: locating a target object image center (C); and moving the target object (O) in order to set the target object image center (C) to be the same as the center of the input region (500).
  5. The method of any one of claims 1, and 2 to 4, wherein a horizontal length of the scan region (530) is a horizontal length of the input region (500), and a vertical length of the scan region (530) is any one of a vertical distance from an upper end of the input region (500) to an upper end of the jig image (200) and a vertical distance from the upper end of the input region (500) to a point at a predetermined height from the upper end of the jig image (200).
  6. The method of any one of claims 2 to 5, insofar as dependent upon claim 3, wherein the coordinates of the jig image (200) are determined according to a preset correlation between a position of the jig (913) and a position of the jig image (200).

Description

BACKGROUND 1. Technical Field The present disclosure relates to a method of setting a scan region and, more particularly, to a method of setting a scan region, the method being capable of aligning a target object in such a manner that a target object image is plotted at a predetermined point on an input region and then of determining at least one portion of the input region, as the scan region. 2.Related Art Three-dimensional scanning technologies have been used in various fields of industry, such as measurement, testing, reverse engineering, content generation, CAD/CAM for dental treatment, and medical equipment. With development in computing technology, an improvement in scanning performance has further increased the practical use of scanners. Particularly, the three-dimensional scanning technology is employed to provide dental treatment for a patient in the field of dental treatment, and thus, high precision is required of a three-dimensional model acquired through three-dimensional scanning. A three-dimensional scanner 910, which scans a target object O (for example, a model that is cast from plaster of paris to duplicate a patient's oral cavity) using the three-dimensional scanning technology, may rotate the target object O (rotate the target object O in one direction (a clockwise or counterclockwise direction) while the target object O is horizontally maintained, in a stably seated state, with respect to one axis of the target object O) and/or tilt the target object O (tilt the target object O to a predetermined inclined angle) in such a manner as to possibly scan the target object O from various angles. As illustrated in FIG. 1, in the three-dimensional scanner 910, a jig 913 is rotated horizontally in one direction or tilted, with the target object O being placed on the top of the jig 913 (an arm). Thus, at least one target object image may be acquired, and a three-dimensional model may be generated on the basis of the one target object image. In addition to the target object image acquired by scanning the target object O, a jig image representing the jig 913 on which the target object O is placed may also be acquired. Moreover, in addition to the target object image acquired by scanning the target object O, an adhesive-member image representing an adhesive member (for example, Blue-Tack reusable adhesive) for fixing the target object O to the jig 913 may also be acquired. The acquired jig image and/or adhesive-member image may be three-dimensionally modeled together with the target object image. However, the three-dimensionally modeling of the acquired jig image and/or adhesive-member image may prevent acquisition of a precise three-dimensional model of the target object O. In the related art, a user has to manually delete the jig image and the adhesive-member image that are acquired together with the target object image. In the related art, as illustrated in FIG. 2, the user also has to arbitrarily set line Y' for adjusting a scan region 530 in order to remove a jig image 200 and an adhesive-member image 300, which are possibly acquired together with a target object image 100, from a three-dimensional modeling process. However, while the user arbitrarily adjusts the scan region 530, there may occur a problem in that the jig image 200 and the adhesive-member image 300 are not completely removed. Moreover, there may occur a problem in that at least one portion of the target object image 100 is inadvertently removed and thus that the incomplete three-dimensional model is acquired. Therefore, in order to acquire the precise three-dimensional model representing the target object O, there is a need to provide a method of setting the precise scan region 530. [Prior Art Document] [Patent Document] (Patent Document) Korean Patent No. 10-1530631 (registered on June 23, 2015) US 2021/0112229 A1 discloses a handheld data acquisition system for capturing three dimensional object shape data comprising a user feedback screen and a scanner module configured such that the scanner module may be rotated with respect to the feedback screen and the user may be able to scan objects including hard-to-reach areas while still being able to view feedback about the on-going scanning process. US 2006/0228010 A1 discloses a scanning system including a hand-held scanning device that generates two-dimensional images of a pattern reflected off an object. The system also includes a memory and processing unit. The memory stores a calibration table for the scanner and received scanned bitmap images. The processing unit generates three-dimensional information as to a scanned object. WO 2020/223594 A2 discloses a system and method for performing real-time quality inspection of objects. The system and method include a transport to move objects being inspected, allowing the inspection to be performed in-line. At least one optical acquisition unit is provided that captured optical images of the objects being inspected. The captured opti