Color correction fixture and method of use thereof

Abstract

A color calibration jig and a method of using the same are disclosed. The color calibration jig includes a body and a first inclination indicator. The body has a color plane with an indicator patch disposed thereon. The indicator patch has a first reference edge and a first reference width perpendicular to the first reference edge. The first inclination indicator is connected to the body and includes a first calibration edge, wherein the first calibration edge has a first distance to the color plane. A first virtual extension line passing through the first calibration edge and a first virtual extension of the first reference edge has a first threshold included angle with a normal line of the color plane.

Description

Technical Field

[0001] This invention relates to a color calibration fixture and its method of use; particularly to a color calibration fixture with indicator color blocks and its method of use. Background Technology

[0002] In denture fabrication, accurate color matching is crucial for aesthetics. This requires the use of shade guides (e.g., tooth shape models with specific colors) and corresponding color charts (e.g., cards with a series of different colors) to compare colors one by one. Commercially available camera images undergo realistic color matching, data conversion, quantification, and color number determination to intuitively enhance tooth color data and increase product value. Digital color matching converts lab data into color numbers and transparent area selection, providing users with more intuitive and accurate color information. This adds value to the product while adhering to dental fabrication procedures, improving fabrication precision, lowering the experience barrier, and expanding the customer base.

[0003] However, when using shade guides, they must be placed against the patient's chin, and the normal of the shade guide must be perpendicular to the camera's shooting plane. In practice, calculations show that the shooting angle when the dental technician is not using any instruments is mostly close to 10 degrees. However, based on past cases, when the shooting angle is greater than 5 degrees, the accuracy of color matching will decrease significantly. For example, if the image taken by the camera is judged to be an incorrect shade after processing, then it is considered an error. For instance, when the shooting angle is between 0 and 5 degrees, the accuracy rate is about 96%, while when the shooting angle is between 6 and 10 degrees, the accuracy rate will drop to 11%, which can cause problems such as misalignment of the denture color and insufficient aesthetics. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a color calibration fixture and its usage method. By using indicator color blocks and indicators, it is possible to quickly determine whether the shooting angle has deviated, providing a stable and repeatable shooting plane reference.

[0005] The color calibration fixture includes a body and a first tilt indicator. The body has a colorimetric plane on which an indicator color block is disposed. The indicator color block has a first reference edge and a first reference width perpendicular to the first reference edge. The first tilt indicator is connected to the body and includes a first calibration edge, wherein the first calibration edge has a first gap with the colorimetric plane. A first virtual extension line from an observation point through the first calibration edge and the first reference edge forms a first critical angle with the normal to the colorimetric plane.

[0006] The method of using the color calibration fixture includes placing the fixture near the colorimetric object. The fixture includes a main body and a first tilt indicator. The main body has a colorimetric plane, on which an indicator color block is disposed. The indicator color block has a first reference edge. The first tilt indicator is connected to the main body and includes a first calibration edge. A first virtual extension line from the observation point through the first calibration edge and the first reference edge forms a first confining angle with the normal to the colorimetric plane. A camera lens is positioned from the observation point at a first camera angle toward the colorimetric plane to record the positions of the first calibration edge and the first reference edge. The first angle is calculated based on the positions of the camera lens, the first calibration edge, and the first reference edge. Based on the first angle, it is determined whether to adjust the first camera angle of the camera lens. Attached Figure Description

[0007] The accompanying drawings presented in this invention are intended to help describe various embodiments of the invention. However, to simplify the drawings and / or highlight what they are meant to present, existing structures and / or elements may be drawn in a simplified schematic manner or presented in an omitted manner. Furthermore, the number of elements in the drawings may be singular or plural. The accompanying drawings presented in this invention are for illustrative purposes only and are not intended to limit the scope of the invention.

[0008] Figure 1A This is a perspective view of a color calibration fixture in one embodiment of the present invention;

[0009] Figure 1B This is a front view of the color calibration fixture in one embodiment of the present invention;

[0010] Figure 1C This is a cross-sectional schematic diagram of a color calibration fixture in one embodiment of the present invention;

[0011] Figure 1D and Figure 1E This is a schematic diagram of the angle between the camera angle and the limit angle in one embodiment of the present invention;

[0012] Figures 1F to 1I This is a schematic diagram showing the camera angle and included angle in different embodiments of the present invention;

[0013] Figure 2A A perspective view of the color calibration fixture in another embodiment of the present invention;

[0014] Figure 2B This is a front view of the color calibration fixture in another embodiment of the present invention;

[0015] Figure 2C This is a cross-sectional schematic diagram of a color calibration fixture in another embodiment of the present invention;

[0016] Figure 2D This is a schematic diagram of the angle between the camera angle and the limit angle in another embodiment of the present invention;

[0017] Figure 3A A perspective view of the color calibration fixture in another embodiment of the present invention;

[0018] Figure 3B This is a front view of the color calibration fixture in another embodiment of the present invention;

[0019] Figure 3C This is a cross-sectional schematic diagram of the color calibration fixture in another embodiment of the present invention;

[0020] Figures 4 to 6 The following is a front view of the primary color card in different embodiments of the present invention;

[0021] Figure 7 This is a flowchart illustrating the method of using a color calibration fixture according to an embodiment of the present invention.

[0022] Symbol Explanation

[0023] 100,200,300:Color correction fixture

[0024] 101,201,301:Ontology

[0025] 102, 202, 302, 402, 502, 602: Colorimetric planes

[0026] 103, 203, 303, 403, 503, 603: Indicator color blocks

[0027] 103a, 203a, 303a, 403a, 503a, 603a: First reference edge

[0028] 103b, 203b, 403b, 503b: Second reference edge

[0029] 203c, 503c: Third reference edge

[0030] 104, 204, 304: Base plate

[0031] 105a, 205a, 305a: First sidewall

[0032] 105b, 205b, 305b: Second sidewall

[0033] 106, 206, 306: Supporting wall

[0034] 107,207,307: Baffle

[0035] 107a, 207a, 307a: Surface

[0036] 108, 208, 308: Colorimeter clamping area

[0037] 109, 209, 309: Handle

[0038] 110, 210, 310: First tilt indicator

[0039] 111,211,311: First calibration edge

[0040] 120, 220: Second tilt indicator

[0041] 122,222: Second calibration edge

[0042] 223: Third calibration edge

[0043] 315: Through hole

[0044] 450, 550, 650: Primary color cards

[0045] 451, 551, 651: Color blocks

[0046] 452, 552, 652: Ruler and compass

[0047] 453,553,653: Indicates the area

[0048] D1: First spacing

[0049] D2: Second spacing

[0050] D3: Third spacing

[0051] G: Gap

[0052] L1: First Virtual Extension Line

[0053] L2: Second Virtual Extension Line

[0054] L3: Third Virtual Extension Line

[0055] N1: Normal line

[0056] P: Observation point

[0057] R: Camera distance

[0058] S710, S720, S730, S740: Steps

[0059] W1: First reference width

[0060] W1L: First width

[0061] W2: Second reference width

[0062] W3: Third reference width

[0063] d: distance

[0064] x: distance

[0065] y1: First offset

[0066] y2: Second offset

[0067] y3: Third offset

[0068] θ1: First confining angle

[0069] θ2: Second confining angle

[0070] θ1L, θ1H: First included angle

[0071] φ1, φ1L, φ1H: First camera angle

[0072] φ2: Second camera angle

[0073] φ3: Third camera angle Detailed Implementation

[0074] Any reference to elements referred to herein by names such as "first," "second," etc., does not generally limit the number or order of these elements. Rather, these names are used herein as a convenient way to distinguish two or more elements or instances of elements. Therefore, it should be understood that the names "first," "second," etc., in the claims do not necessarily correspond to the same names in the written description. Furthermore, it should be understood that references to first and second elements do not imply that only two elements can be used or that the first element must precede the second element. The terms "comprising," "including," "having," "containing," etc., as used herein are open-ended, meaning that they include but are not limited to. In this invention, the words "exemplary" and "for example" are used to mean "serving as an example, instance, or illustration." Any implementation or aspect described herein as "exemplary" or "for example" is not necessarily to be construed as preferred or advantageous over other aspects of the invention. The terms "about," "approximately," and "roughly" as used herein with respect to specified values ​​or characteristics are intended to mean within a certain value (e.g., 10%) of the specified value or characteristic.

[0075] Furthermore, relative terms such as "below" or "below" and "above" or "over" may be used herein to describe the relationship between one element and another, as illustrated in the figures. It should be understood that relative terms are intended to include different orientations of the device beyond those shown in the figures. For example, if a device in one figure is flipped, an element described as being "below" to another element will be oriented "above" to that element. Thus, the exemplary term "below" can include both "below" and "above" orientations, depending on the specific orientation of the figure. Similarly, if a device in one figure is flipped, an element described as being "below" or "below" to another element will be oriented "above" to that element. Thus, the exemplary term "below" or "below" can include both "above" and "below" orientations.

[0076] Various embodiments will be described below, and those skilled in the art should readily understand the spirit and principles of the invention by referring to the description and accompanying drawings. However, while specific embodiments will be described in detail herein, these embodiments are merely illustrative and are not to be construed as limiting or exhaustive in any respect. Therefore, various changes and modifications to the invention will be readily apparent and easily achievable by those skilled in the art without departing from the spirit and principles of the invention.

[0077] Please refer to Figures 1A to 1C According to an embodiment of the present invention, a color-correcting fixture 100 is disclosed, including a body 101, a first tilt indicator 110, and a second tilt indicator 120. For example... Figures 1A to 1C As shown, the body 101 has a colorimetric plane 102, and an indicator color block 103 is provided on the colorimetric plane 102. The indicator color block 103 has a first reference edge 103a and a first reference width W1 perpendicular to the first reference edge 103a. The indicator color block 103 has a second reference edge 103b and a second reference width W2 perpendicular to the second reference edge 103b. In such a way... Figure 1A and Figure 1B In the illustrated embodiment, the indicator color block 103 is elongated; however, the invention is not limited to this, and any graphic that can define reference edges (e.g., 103a, 103b) is applicable. Figure 1A and Figure 1B In the illustrated embodiment, the reference width (e.g., W1, W2) of the indicator color block 103 may be 5 mm; however, the invention is not limited thereto, and these values ​​are merely examples and not intended to be limiting. For information on the reference width of the indicator color block, please refer to... Figure 1D and Figure 1E The examples and descriptions are shown below.

[0078] like Figures 1A to 1CAs shown, a first tilt indicator 110 is connected to the body 101 and includes a first calibration edge 111, wherein the first calibration edge 111 has a first gap D1 between it and the colorimetric plane 102. A second tilt indicator 120 is connected to the body 101 and includes a second calibration edge 122, wherein the second calibration edge 122 has a second gap D2 between it and the colorimetric plane 102. Figure 1A and Figure 1B In the illustrated embodiment, the second tilt indicator 120 is perpendicular to the first tilt indicator 110, and the second calibration edge 122 is perpendicular to the first calibration edge 111. However, the present invention is not limited to this; the arrangement of multiple tilt indicators can be adjusted according to requirements. For example, when the tilt angle to be calibrated is both the vertical shooting angle and the horizontal shooting angle, one tilt indicator can be set for each (e.g., the first tilt indicator 110 and the second tilt indicator 120). Figure 1A and Figure 1B In the illustrated embodiment, both the first spacing D1 and the second spacing D2 can be 5 mm; however, the invention is not limited thereto, and these values ​​are merely examples and not intended to be limiting. The first spacing D1 and the second spacing D2 can be the same or different. For information on the spacing between the calibration edge and the colorimetric plane, please refer to... Figure 1D and Figure 1E The examples and descriptions are shown below.

[0079] In such Figures 1A to 1C In the illustrated embodiment, the body 101 includes a base plate 104, a first sidewall 105a, and a support wall 106. The base plate 104 connects the support wall 106 and the first sidewall 105a. The colorimetric plane 102 is parallel to the support wall 106 and perpendicular to the base plate 104. The body 101 may also include a second sidewall 105b disposed opposite to the first sidewall 105a. The support wall 106 connects the first sidewall 105a and the second sidewall 105b, and the base plate 104 connects the support wall 106, the first sidewall 105a, and the second sidewall 105b. Figure 1A and Figure 1B As shown, the first tilt indicator 110 is connected to and perpendicular to the first sidewall 105a, and the second tilt indicator 120 is connected to and parallel to the first sidewall 105a. In... Figures 1A to 1C In the illustrated embodiment, the first tilt indicator 110 can be divided into a portion connected to the first sidewall 105a and another portion connected to the second sidewall 105b. However, the invention is not limited to this, and the structure of the tilt indicator can be adjusted as needed, for example, it can be a continuous structure connecting the first sidewall 105a and the second sidewall 105b. Figures 1A to 1C In the illustrated embodiment, the second tilt indicator 120 can be divided into a portion connected to the first sidewall 105a and another portion connected to the second sidewall 105b. However, the invention is not limited to this, and the structure of the tilt indicator can be adjusted as needed, for example... Figures 2A to 2CIn the illustrated embodiment, the second tilt indicator 220 may be a single component instead of being split into two parts. In such... Figure 1A and Figure 1B In the illustrated embodiment, the first tilt indicator 110 and the second tilt indicator 120 are cuboids; however, the invention is not limited to this, and any shape that defines the calibration edges (e.g., 111, 122) can be applied. Figures 3A to 3C In the illustrated embodiment, the tilt indicator (e.g., 310) may be circular. In such... Figure 1A and Figure 1B In the illustrated embodiments, the thickness of the tilt indicator (e.g., 110, 120) may be 5 mm; however, the invention is not limited thereto. These values ​​are merely examples and not intended to be limiting. The dimensions (e.g., length, width, height, thickness, etc.) of the tilt indicator of the invention can be designed as needed, and any dimension that defines the calibration edge is applicable. The color matching plane 102 of the color calibration fixture 100 may be disposed on the support wall 106; however, the invention is not limited thereto. In some embodiments, the color calibration fixture may also include a primary color card, with the color matching plane and indicator color blocks disposed on the primary color card, and the primary color card can be detachably combined with the main body.

[0080] like Figures 1A to 1C As shown, the color calibration fixture 100 has two reference edges for its indicator color block 103, two tilt indicators, and two calibration edges. However, the present invention is not limited to this. The number and position of the indicator color block and its reference edges, tilt indicators and their calibration edges can be adjusted according to requirements, for example, in... Figures 2A to 2C In the illustrated embodiment, the color calibration fixture 200 has three reference edges (e.g., 203a, 203b, 203c) for its indicator color block 203, two tilt indicators (e.g., 210 and 220) and three calibration edges (e.g., 211, 222, 223); in Figures 3A to 3C In the illustrated embodiment, the color calibration fixture 300 has only one reference edge (e.g., 303a) for the indicator color block 303, and only one tilt indicator (e.g., 310) and one calibration edge (e.g., 311) for the color calibration fixture 300.

[0081] like Figures 1A to 1C As shown, the color calibration fixture 100 may further include a baffle 107, and the surface 107a of the baffle 107 coincides with the color matching plane 102. In some embodiments, the color calibration fixture may further include a primary color card, with the color matching plane and indicator color blocks disposed on the primary color card, and the primary color card can be detachably assembled with the main body, wherein the space between the baffle 107 and the support wall 106 can accommodate the primary color card, and the primary color card abuts against the baffle 107, such that the color matching plane 102 of the primary color card coincides with the surface 107a of the baffle 107. For details on the setting of the primary color card, please refer to... Figures 4 to 6 The examples and descriptions are shown below.

[0082] like Figure 1C As shown, the color calibration fixture 100 may also include a colorimeter clamping area 108 for clamping a colorimeter (not shown). In addition to providing a stable and repeatable reference plane for the imaging, the color calibration fixture provided by this invention also ensures accurate repeatability of positioning by clamping the colorimeter in the colorimeter clamping area. Specifically, the relative positions between adjacent colorimetric objects (e.g., teeth of a person requiring dentures), the colorimeter, and the colorimetric plane can be positioned by the color calibration fixture to improve the accuracy of color calibration. Figures 1A to 1C As shown, the color calibration fixture 100 may also include a handle 109, which allows personnel to hold the color calibration fixture for shooting, thus avoiding deterioration or damage caused by personnel directly contacting the original color card (if any) and color matching sheet due to factors such as hand sweat, and thus extending its service life.

[0083] like Figure 1D As shown, a first virtual extension line L1 from an observation point P, passing through the first calibration edge 111 and the first reference edge 103a, has a first critical angle θ1 with the normal line N1 of the colorimetric plane 102. For example, a camera lens can be placed at the observation point P, and the positions of the first calibration edge 111 and the first reference edge 103a can be recorded towards the colorimetric plane 102 at a first shooting angle φ1, where the shooting distance is R. When the camera lens records the image, if the position of the color calibration fixture 100 is not in the center of the image, there will be a first offset y1. Figure 1D In the illustrated embodiment, the distance from the shooting point P to the colorimetric plane 102 is x, which is R cos φ1°; the distance from the projection point of the shooting point P onto the colorimetric plane 102 to the center of the image is d, which is R sin φ1°. Figure 1D In the geometric relationship, based on information such as the positions of the camera lens, the first calibration side 111, and the first reference side 103a, the first critical angle θ1 can be calculated using the following formula:

[0084]

[0085] As can be seen from the formula, the first spacing D1, the first offset y1, the camera distance R, and the first camera angle φ1 are all related to the first reference width W1 of the indicator color block 103. In other words, by fixing the first spacing D1 of the color calibration fixture and the first reference width W1 of the indicator color block 103, the first limiting angle θ1 can be determined. When the camera distance R, the first camera angle φ1, and the first offset y1 satisfy the above formula, it can be determined that it is within the effective shooting range. For example, when the camera distance R is 300 mm, the first camera angle φ1 is 5 degrees, the first offset y1 is 32.5 mm, and the first spacing D1 is 5 mm, the first reference width W1 can be calculated to be approximately 0.9 mm. However, the present invention is not limited to this, and these values ​​are merely examples and are not intended to be limiting.

[0086] like Figure 1E As shown, a second virtual extension line L2 from an observation point P, passing through the second calibration edge 122 and the second reference edge 103b, has a second critical angle θ2 with the normal N1 of the colorimetric plane 102. For example, a camera lens can be placed at the observation point P and the positions of the second calibration edge 122 and the second reference edge 103b can be recorded towards the colorimetric plane 102 at a second shooting angle φ2, where the shooting distance is R. When the camera lens records the image, if the position of the color calibration fixture 100 is not in the center of the image, there will be a second offset y2. Figure 1E In the illustrated embodiment, the distance from the shooting point P to the colorimetric plane 102 is x, which is R cos φ2°; the distance from the projection point of the shooting point P onto the colorimetric plane 102 to the center of the image is d, which is R sin φ2°. Figure 1E In the geometric relationship, based on information such as the positions of the camera lens, the second calibration side 122, and the second reference side 103b, the second limiting angle θ2 can be calculated using the following formula:

[0087]

[0088] As can be seen from the formula, the second spacing D2, the second offset y2, the camera distance R, and the second camera angle φ2 are all related to the second reference width W2 of the indicator color block 103. In other words, by fixing the second spacing D2 of the color calibration fixture and the second reference width W2 of the indicator color block 103, the second limiting angle θ2 can be determined. When the camera distance R, the second camera angle φ2, and the second offset y2 satisfy the above formula, it can be determined that it is within the effective shooting range. For example, when the camera distance R is 300 mm, the second camera angle φ2 is 5 degrees, the second offset y2 is 22.5 mm, and the second spacing D2 is 5 mm, the second reference width W2 can be calculated to be approximately 0.8 mm. However, the present invention is not limited to this, and these values ​​are merely examples and are not intended to be limiting.

[0089] Specifically, when an image of the color calibration fixture is captured within a preset shooting angle (e.g., within 5 degrees for better color accuracy), the indicator color block will be aligned with the calibration edge of the tilt indicator. If the shooting angle exceeds this range (e.g., above 5 degrees), the indicator color block may be covered by the calibration edge of the tilt indicator, or there may be a gap between the indicator color block and the calibration edge of the tilt indicator. For example, the first calibration edge 111 may have a first virtual vertical projection on the colorimetric plane 102, which corresponds to the first reference edge 103a. The second calibration edge 122 may have a second virtual vertical projection on the colorimetric plane 102, which corresponds to the second reference edge 103b. When each virtual vertical projection covers the indicator color block or has a gap with it, it indicates that the preset shooting angle has been exceeded. For the relationship between the color calibration fixture and the shooting angle, please refer to the following... Figures 1F to 1IThe examples and descriptions are shown below.

[0090] Figure 1F and Figure 1G This is a schematic diagram illustrating the camera angle and the included angle in one embodiment of the present invention. Figure 1F As shown, the indicator color block 103 is covered by the first calibration edge 111 of the first tilt indicator 110, wherein the first calibration edge 111 and the first reference edge 103a of the indicator color block 103 have a first width W1L. Figure 1G As shown, a first virtual extension line L1 from an observation point P, passing through the first calibration edge 111 and the first reference edge 103a, forms a first angle θ1L with the normal line N1 of the colorimetric plane 102. For example, a camera lens can be placed at the observation point P and its position can be recorded towards the colorimetric plane 102 at a first shooting angle φ1L, where the shooting distance is R. When the camera lens records the image, if the position of the color calibration fixture 100 is not in the center of the image, there will be a first offset y1. In such cases... Figure 1G In the illustrated embodiment, the distance from the shooting point P to the colorimetric plane 102 is x, which is R cos φ1L°; the distance from the projection point of the shooting point P on the colorimetric plane 102 to the center of the image is d, which is Rsin φ1L°. Figure 1G In the geometric relationship, based on information such as the positions of the camera lens, the first calibration side 111, and the first reference side 103a, the first included angle θ1L can be calculated using the following formula:

[0091]

[0092] Compare Figure 1D and Figure 1G As can be seen from the embodiment shown, since the indicator color block 103 is covered by the first calibration edge 111 of the first tilt indicator 110, the first width W1L will be less than the first reference width W1, and the resulting first included angle θ1L will be less than the first limit included angle θ1. Therefore, the shooting angle of the camera lens needs to be adjusted.

[0093] Figure 1H and Figure 1I This is a schematic diagram illustrating the camera angle and the included angle in another embodiment of the present invention. Figure 1H As shown, there is a gap G between the indicator color block 103 and the first calibration edge 111 of the first tilt indicator 110, wherein the indicator color block 103 has a first reference width W1. Figure 1IAs shown, a first virtual extension line L1 from an observation point P, passing through the first calibration edge 111 and the first reference edge 103a, forms a first angle θ1H with the normal N1 of the colorimetric plane 102. For example, a camera lens can be placed at the observation point P and its position relative to the first calibration edge 111 and the first reference edge 103a can be recorded at a first shooting angle φ1H towards the colorimetric plane 102, where the shooting distance is R. When the camera lens records the image, if the position of the color calibration fixture 100 is not in the center of the image, there will be a first offset y1. In such cases... Figure 1I In the illustrated embodiment, the distance from the shooting point P to the colorimetric plane 102 is x, which is R cos φ1H°; the distance from the projection point of the shooting point P onto the colorimetric plane 102 to the center of the image is d, which is R sin φ1H°. Figure 1I In the geometric relationship, based on information such as the positions of the camera lens, the first calibration side 111, and the first reference side 103a, the first included angle θ1H can be calculated using the following formula:

[0094]

[0095] Compare Figure 1D and Figure 1I As can be seen from the embodiment shown, since there is a gap G between the indicator color block 103 and the first calibration edge 111 of the first tilt indicator 110, the resulting first included angle θ1H will be greater than the first limit included angle θ1, so the shooting angle of the camera lens needs to be adjusted.

[0096] like Figures 1F to 1I The shooting angle and related details described herein can be applied to other embodiments of the present invention, and will not be repeated here. The color calibration fixture provided by the present invention can quickly determine whether the shooting angle deviates through the indicator color block and indicator, providing a stable and repeatable shooting plane reference.

[0097] Please refer to Figures 2A to 2C According to one embodiment of the present invention, a color calibration fixture 200 is disclosed, including a body 201, a first tilt indicator 210, and a second tilt indicator 220. The color calibration fixture 200 is substantially similar to Figures 1A to 1C Color calibration fixture 100, wherein similar element symbols indicate similar elements. For the sake of brevity, the relevant description is omitted here; the previously described color calibration fixture and its related details are applicable here, and only the differences are described below.

[0098] like Figures 2A to 2CAs shown, the body 201 has a colorimetric plane 202, and an indicator color block 203 is provided on the colorimetric plane 202. The indicator color block 203 has a first reference edge 203a and a first reference width W1 perpendicular to the first reference edge 203a. The indicator color block 203 has a second reference edge 203b and a second reference width W2 perpendicular to the second reference edge 203b. The indicator color block 203 has a third reference edge 203c and a third reference width W3 perpendicular to the third reference edge 203c. A first tilt indicator 210 is connected to the body 201 and includes a first calibration edge 211, wherein the first calibration edge 211 has a first gap D1 between it and the colorimetric plane 202. A second tilt indicator 220 is connected to the body 201 and includes a second calibration edge 222, wherein the second calibration edge 222 has a second gap D2 between it and the colorimetric plane 202. The second tilt indicator 220 is connected to the first tilt indicator 210 and includes a third calibration edge 223, wherein the third calibration edge 223 has a third distance D3 between it and the colorimetric plane 202, and the third calibration edge 223 is perpendicular to the first calibration edge 211. The body 201 includes a base plate 204, a first sidewall 205a, and a support wall 206. The base plate 204 connects the support wall 206 and the first sidewall 205a, wherein the colorimetric plane 202 is parallel to the support wall 206 and perpendicular to the base plate 204. The body 201 may also include a second sidewall 205b disposed opposite to the first sidewall 205a. The support wall 206 connects between the first sidewall 205a and the second sidewall 205b, and the base plate 204 connects the support wall 206, the first sidewall 205a, and the second sidewall 205b. The first tilt indicator 210 is connected to and perpendicular to the first sidewall 205a. The color calibration fixture 200 may also include a baffle 207, and the surface 207a of the baffle 207 coincides with the colorimetric plane 202. The color calibration fixture 200 may also include a colorimetric sheet holding area 208 for holding colorimetric sheets (not shown). The color calibration fixture 200 may also include a handle 209.

[0099] like Figure 2D As shown, a third virtual extension line L3, originating from an observation point P and passing through the third calibration edge 223 and the third reference edge 203c, has a third critical angle θ3 between it and the normal N1 of the colorimetric plane 202. For example, a camera lens can be placed at the observation point P, and the positions of the third calibration edge 223 and the third reference edge 203c can be recorded towards the colorimetric plane 202 at a third camera angle φ3, where the camera distance is R. When the camera lens records the image, if the position of the color calibration fixture 200 is not in the center of the image, there will be a third offset y3. In such cases... Figure 2D In the illustrated embodiment, the distance from the shooting point P to the colorimetric plane 202 is x, which is R cos φ3°; the distance from the projection point of the shooting point P onto the colorimetric plane 202 to the center of the image is d, which is R sin φ3°. Figure 2DIn the geometric relationship, based on information such as the positions of the camera lens, the third calibration side 223, and the third reference side 203c, the third critical limit angle θ3 can be calculated using the following formula:

[0100]

[0101] As can be seen from the formula, the third spacing D3, the third offset y3, the camera distance R, and the third camera angle φ3 are all related to the third reference width W3 of the indicator color block 203. In other words, by fixing the third spacing D3 of the color calibration fixture and the third reference width W3 of the indicator color block 203, the third limiting angle θ3 can be determined. When the camera distance R, the third camera angle φ3, and the third offset y3 satisfy the above formula, it can be determined that it is within the effective shooting range. For example, when the camera distance R is 300 mm, the third camera angle φ3 is 5 degrees, the third offset y3 is 32.5 mm, and the third spacing D3 is 5 mm, the third reference width W3 can be calculated to be approximately 0.9 mm. However, the present invention is not limited to this, and these values ​​are merely examples and are not intended to be limiting.

[0102] Specifically, when an image of the color calibration fixture is captured within a preset shooting angle (e.g., within 5 degrees for better colorimetric accuracy), the indicator color block will be aligned with the calibration edge of the tilt indicator. If this shooting angle is exceeded (e.g., above 5 degrees), the indicator color block may be covered by the calibration edge of the tilt indicator, or there may be a gap between the indicator color block and the calibration edge of the tilt indicator. For example, the third calibration edge 223 may have a third virtual vertical projection on the colorimetric plane 202, which corresponds to the third reference edge 203c. When any virtual vertical projection covers the indicator color block or has a gap with it, it indicates that the preset shooting angle has been exceeded. Figures 2A to 2C In the embodiment shown, the second tilt indicator 220 can be a single part instead of being split into two parts, which reduces the number of alignment reference points, allows for adjustments to the design of the color calibration fixture to meet different needs, and increases the applicability of the invention.

[0103] Please refer to Figures 3A to 3C According to one embodiment of the present invention, a color calibration fixture 300 is disclosed, including a body 301 and a first tilt indicator 310. The color calibration fixture 300 is substantially similar to Figures 1A to 1C Color calibration fixture 100, wherein similar element symbols indicate similar elements. For the sake of brevity, the relevant description is omitted here; the previously described color calibration fixture and its related details are applicable here, and only the differences are described below.

[0104] like Figures 3A to 3CAs shown, the body 301 has a colorimetric plane 302, and an indicator color block 303 is provided on the colorimetric plane 302. The indicator color block 303 has a first reference edge 303a and a first reference width W1 perpendicular to the first reference edge 303a. In such a case... Figure 3A and Figure 3B In the illustrated embodiment, the indicator color block 303 is circular, and the first reference width W1 is the radius of the circle. The first tilt indicator 310 is connected to the body 301 and includes a first calibration edge 311, wherein the first calibration edge 311 has a first gap D1 with the colorimetric plane 302. Figures 3A to 3C As shown, the first tilt indicator 310 is circular and includes a circular through hole 315, wherein the first calibration edge 311 is the periphery of the circular through hole 315. The body 301 includes a base plate 304, a first side wall 305a, and a support wall 306. The base plate 304 connects the support wall 306 and the first side wall 305a, wherein the colorimetric plane 302 is parallel to the support wall 306 and perpendicular to the base plate 304. The body 301 may also include a second side wall 305b disposed opposite to the first side wall 305a. The support wall 306 connects the first side wall 305a and the second side wall 305b, and the base plate 304 connects the support wall 306, the first side wall 305a, and the second side wall 305b. The first tilt indicator 310 is connected to the first side wall 305a. The color calibration fixture 300 may also include a baffle 307, and the surface 307a of the baffle 307 coincides with the colorimetric plane 302. The color calibration fixture 300 may also include a colorimeter holding area 308 for holding colorimeters (not shown). The color calibration fixture 300 may also include a handle 309.

[0105] Specifically, when an image of the color calibration fixture is captured within a preset shooting angle (e.g., within 5 degrees for better colorimetric accuracy), the indicator color block will be aligned with the calibration edge of the tilt indicator. If the shooting angle exceeds this range (e.g., above 5 degrees), the indicator color block may be covered by the calibration edge of the tilt indicator, or there may be a gap between the indicator color block and the calibration edge of the tilt indicator. In cases such as... Figures 1A to 1C and Figures 2A to 2C In the illustrated embodiment, two tilt indicators are used to calibrate the vertical and horizontal shooting angles, respectively. And in... Figures 3A to 3C In the embodiment shown, since the first tilt indicator 310 is circular, all directions can be determined using only one reference point. This allows the design of the color calibration fixture to be adjusted according to different needs, increasing the applicability of the invention.

[0106] Figures 4 to 6This is a front view of the primary color card in different embodiments of the present invention. As previously mentioned, in some embodiments, the color calibration fixture provided by the present invention may further include a primary color card, a colorimetric plane and an indicator color block disposed on the primary color card, and the primary color card can be detachably assembled with the main body. The primary color card can be used with the aforementioned color calibration fixtures 100, 200, and 300, wherein similar element symbols indicate similar elements. For the sake of brevity, related descriptions are omitted here, but the previously described color calibration fixtures and their related details are applicable here.

[0107] In such Figure 4 In the illustrated embodiment, the primary color chart 450 is provided with a colorimetric plane 402 and an indicator color block 403. The indicator color block 403 has a first reference edge 403a and a first reference width W1 perpendicular to the first reference edge 403a. The indicator color block 403 has a second reference edge 403b and a second reference width W2 perpendicular to the second reference edge 403b. The primary color chart 450 can be paired with similar... Figures 1A to 1C The color-calibrating jig 100 shown is used. For example... Figure 4 As shown, the colorimetric plane 402 may include multiple colorimetric blocks 451 of different colors (e.g., hue, lightness, chroma, etc.). The colors of adjacent colorimetric objects (e.g., teeth of a person needing dentures), colorimetric sheets (not shown), and colorimetric blocks 451 can be recorded by a camera lens for digital colorimetric matching. However, the invention is not limited to this; existing colorimetric block designs can be used, and the colorimetric blocks can also be mounted on the support wall or other structures of the color calibration fixture along with the colorimetric plane. Figure 4 As shown, the colorimetric plane 402 may also include a ruler 452 for measuring tooth dimensions. Figure 4 As shown, the colorimetric plane 402 may also include a marking area 453, which may be printed with white or grayscale colors to correct the white balance of the camera lens, or may be printed with graphics such as company or product logos, instructions, original color card numbers, etc.

[0108] In such Figure 5 In the illustrated embodiment, the primary color chart 550 is provided with a colorimetric plane 502 and an indicator color block 503. The indicator color block 503 has a first reference edge 503a and a first reference width W1 perpendicular to the first reference edge 503a. The indicator color block 503 has a second reference edge 503b and a second reference width W2 perpendicular to the second reference edge 503b. The indicator color block 503 has a third reference edge 503c and a third reference width W3 perpendicular to the third reference edge 503c. The primary color chart 550 can be paired with similar... Figures 2A to 2C The color-calibrating jig 200 shown is used. For example... Figure 5 As shown, the colorimetric plane 502 may include multiple colorimetric blocks 551 of different colors (e.g., hue, lightness, chroma, etc.). Figure 5 As shown, the colorimetric plane 502 may also include a ruler 552 for measuring tooth dimensions. Figure 5As shown, the colorimetric plane 502 may also include a marking area 553. The previously described colorimetric blocks, rulers, marking areas, and related details are applicable here.

[0109] In such Figure 6 In the illustrated embodiment, the primary color chart 650 is provided with a colorimetric plane 602 and an indicator color block 603. The indicator color block 603 has a first reference edge 603a and a first reference width W1 perpendicular to the first reference edge 603a. In such a case... Figure 6 In the illustrated embodiment, the indicator color block 603 is circular, and the first reference width W1 is the radius of the circle. The primary color card 650 can be paired with a similar... Figures 3A to 3C The color-calibrating jig 300 shown is used. For example... Figure 6 As shown, the colorimetric plane 602 may include multiple colorimetric blocks 651 of different colors (e.g., hue, lightness, chroma, etc.). Figure 6 As shown, the colorimetric plane 602 may also include a ruler 652 for measuring tooth dimensions. Figure 6 As shown, the colorimetric plane 602 may also include a marking area 653. The previously described colorimetric blocks, rulers, marking areas, and related details are applicable here.

[0110] Please refer to Figure 7 According to an embodiment of the present invention, a method of using a color-correcting fixture is disclosed, which is used to make dentures.

[0111] Step S710: Place the color calibration fixture on a nearby colorimetric object. The color calibration fixture includes a body and a first tilt indicator. The body has a colorimetric plane, on which an indicator color block is disposed. The indicator color block has a first reference edge and a first reference width perpendicular to the first reference edge. The first tilt indicator is connected to the body and includes a first calibration edge, wherein the first calibration edge has a first gap with the colorimetric plane. A first virtual extension line from an observation point through the first calibration edge and the first reference edge has a first critical angle with the normal of the colorimetric plane. The previously described color calibration fixtures 100, 200, and 300 and their related details are applicable here.

[0112] Step S720: The camera lens is directed from the observation point toward the colorimetric plane at a first camera angle to record the positions of the first calibration edge and the first reference edge. The previously described details regarding the first camera angle and other related information are applicable here, and for the sake of brevity, such descriptions are omitted.

[0113] Step S730: Calculate the first included angle based on the positions of the camera lens, the first calibration edge, and the first reference edge. The previously described details regarding the first included angle and related matters are applicable here, and for the sake of brevity, these descriptions are omitted.

[0114] Step S740: Determine whether to adjust the first camera angle of the camera lens based on the first included angle. The previously mentioned details regarding the first included angle and the first camera angle are applicable here, and for the sake of brevity, the relevant descriptions are omitted here.

[0115] In some embodiments, the indicator color block of the color calibration fixture in step S710 may further have a second reference edge and a second reference width perpendicular to the second reference edge; the color calibration fixture also includes a second tilt indicator perpendicular to the first tilt indicator, the second tilt indicator being connected to the body and including a second calibration edge, wherein the second calibration edge has a second gap with the colorimetric plane, and the second calibration edge is perpendicular to the first calibration edge; wherein, a second threshold angle is formed between the second virtual extension line of the observation point through the second calibration edge and the second reference edge and the normal of the colorimetric plane. In some embodiments, step S720 may further include: recording the position of the second calibration edge and the second reference edge by moving the camera lens from the observation point toward the colorimetric plane at a second camera angle; step S730 may further include: calculating the second angle based on the position of the camera lens, the second calibration edge, and the second reference edge; step S740 may further include: determining whether to adjust the second camera angle of the camera lens based on the second angle. The previously described color calibration fixtures 100 and 200 and their related details are applicable here.

[0116] In some embodiments, the indicator color block of the color calibration fixture in step S710 may further have a third reference edge and a third reference width perpendicular to the third reference edge; the second tilt indicator is connected to the first tilt indicator, the second tilt indicator includes a third calibration edge, wherein the third calibration edge has a third distance from the colorimetric plane, and the third calibration edge is perpendicular to the first calibration edge; wherein, a third limiting angle exists between the third virtual extension line of the observation point through the third calibration edge and the third reference edge and the normal of the colorimetric plane. In some embodiments, step S720 may further include: recording the position of the third calibration edge and the third reference edge by moving the camera lens from the observation point toward the colorimetric plane at a third camera angle; step S730 may further include: calculating the third angle based on the position of the camera lens, the third calibration edge, and the third reference edge; step S740 may further include: determining whether to adjust the third camera angle of the camera lens based on the third angle. The previously described color calibration fixture 200 and its related details are applicable here.

[0117] In some embodiments, the first tilt indicator of the color calibration fixture in step S710 is circular and includes a circular through-hole, wherein the first calibration edge is the periphery of the circular through-hole. The previously described color calibration fixture 300 and its related details are applicable here.

[0118] In some embodiments, the body of the color calibration fixture further includes a colorimeter holding area for holding colorimeters, wherein the colorimeters are adjacent to neighboring colorimetric objects. The previously described colorimeter holding areas 108, 208, 308 and their related details are applicable here.

[0119] In some embodiments, the body of the color calibration fixture includes a base plate, a first side wall, and a support wall. The base plate connects the support wall and the first side wall. A first tilt indicator is connected to and perpendicular to the first side wall, and a colorimetric plane is disposed on the support wall and perpendicular to the base plate. The previously described color calibration fixtures 100, 200, and 300 and their related details are applicable here.

[0120] In some embodiments, the color calibration fixture further includes a primary color card, a colorimetric plane, and an indicator color patch disposed on the primary color card, wherein the primary color card is detachably assembled to the body. In some embodiments, before step S710, for example before placing the color calibration fixture on an adjacent colorimetric object, the primary color card is assembled to the body. In some embodiments, the body includes a baffle, and the surface of the baffle contacts the primary color card and coincides with the colorimetric plane. The previously described color calibration fixtures 100, 200, 300; baffles 107, 207, 307; primary color cards 450, 550, 650, and their related details are applicable here.

[0121] The color calibration fixture and its usage method provided by this invention allow for alignment shooting, significantly improving accuracy. It also allows for visual confirmation that the shooting angle (e.g., vertical and horizontal angles) is within the effective shooting range. The color calibration fixture can also adjust the size of the corresponding indicator color block according to the actual effective shooting angle range using a formula, providing a stable and repeatable shooting plane reference (e.g., the Z-axis perpendicular to the shooting plane). The color calibration fixture provided by this invention features a design that clearly indicates the coordinate axis direction (e.g., the Z-axis). By plotting the indicator color block, it is quickly determined whether the shooting lens is within the effective shooting angle range (e.g., a normal parallel to the shooting plane). The color calibration fixture provided by this invention may also include a colorimeter clamping area for clamping the colorimeter. In addition to providing a stable and repeatable shooting plane reference, the color calibration fixture provided by this invention also ensures accurate repeatability by clamping the colorimeter in the colorimeter clamping area.

[0122] The prior description of the invention is provided to enable those skilled in the art to make or practice the invention. Various modifications to the invention will be apparent to those skilled in the art, and the general principles defined herein can be applied to other variations or embodiments can be implemented in combination with or alone without departing from the spirit or scope of the invention. Therefore, the invention is not intended to be limited to the examples described herein, but is accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A color calibration fixture, comprising: The body has a colorimetric plane, on which an indicator color block is provided, wherein the indicator color block has a first reference edge and a first reference width perpendicular to the first reference edge; A first tilt indicator is connected to the body and includes a first calibration edge, wherein the first calibration edge has a first gap with the colorimetric plane; wherein a first virtual extension line from the observation point through the first calibration edge and the first reference edge has a first critical angle with the normal of the colorimetric plane.

2. The color-calibrating fixture as claimed in claim 1, wherein the body comprises: The base plate, the first side wall, and the support wall are provided. The base plate connects the support wall and the first side wall. The colorimetric plane is parallel to the support wall and perpendicular to the base plate. The first tilt indicator is connected to and perpendicular to the first side wall.

3. The color calibration fixture as claimed in claim 1, wherein the indicator color block has a second reference edge and a second reference width perpendicular to the second reference edge; the color calibration fixture further includes a second tilt indicator perpendicular to the first tilt indicator, the second tilt indicator being connected to the body and including a second calibration edge, wherein the second calibration edge has a second distance from the colorimetric plane, and the second calibration edge is perpendicular to the first calibration edge; wherein, The second virtual extension line through the second calibration edge and the second reference edge has a second critical angle with the normal of the colorimetric plane.

4. The color-calibrating fixture as described in claim 3, wherein the body comprises: The base plate, the first side wall, and the support wall are provided. The base plate connects the support wall and the first side wall. The colorimetric plane is parallel to the support wall and perpendicular to the base plate. The second tilt indicator is connected to and parallel to the first side wall.

5. The color calibration fixture as claimed in claim 3, wherein the indicator color block has a third reference edge and a third reference width perpendicular to the third reference edge; wherein the second tilt indicator is connected to the first tilt indicator, the second tilt indicator includes a third calibration edge, wherein the third calibration edge has a third distance from the colorimetric plane, and the third calibration edge is perpendicular to the first calibration edge; wherein, The third virtual extension line through the third calibration edge and the third reference edge has a third critical angle with the normal of the colorimetric plane.

6. The color calibration fixture as claimed in claim 1, wherein the first tilt indicator is circular and includes a circular through hole, wherein the first calibration edge is the periphery of the circular through hole.

7. The color calibration fixture as claimed in claim 1, wherein the body further includes a baffle, and the surface of the baffle coincides with the colorimetric plane.

8. The color calibration fixture as claimed in claim 1, wherein the body further includes a colorimeter holding area for holding the colorimeter.

9. The color calibration fixture as claimed in claim 2, wherein the color matching plane is disposed on the support wall.

10. The color calibration fixture as described in any one of claims 1 to 8 further includes a primary color card, the colorimetric plane and the indicator color block are disposed on the primary color card, and the primary color card is detachably assembled with the main body.

11. A method of using a color-correcting fixture, the color-correcting fixture being used to fabricate dentures, comprising: The color calibration fixture is placed near the colorimetric object, wherein the color calibration fixture includes: The body has a colorimetric plane, on which an indicator color block is provided, wherein the indicator color block has a first reference edge and a first reference width perpendicular to the first reference edge; A first tilt indicator is connected to the body and includes a first calibration edge, wherein the first calibration edge has a first gap with the colorimetric plane; wherein a first virtual extension line from the observation point through the first calibration edge and the first reference edge has a first critical angle with the normal of the colorimetric plane. The camera lens is directed from the observation point toward the colorimetric plane at a first camera angle to record the positions of the first calibration edge and the first reference edge; The first included angle is calculated based on the positions of the camera lens, the first calibration edge, and the first reference edge; and Based on the first included angle, determine whether to adjust the first camera angle of the camera lens.

12. The method of use as claimed in claim 11, wherein the indicator color block has a second reference edge and a second reference width perpendicular to the second reference edge; the color calibration fixture further includes a second tilt indicator perpendicular to the first tilt indicator, the second tilt indicator being connected to the body and including a second calibration edge, wherein the second calibration edge has a second distance from the colorimetric plane, and the second calibration edge is perpendicular to the first calibration edge; wherein, The second virtual extension line from the observation point through the second calibration edge and the second reference edge has a second critical angle with the normal of the colorimetric plane.

13. The method of use as described in claim 12, further comprising: The camera lens is directed from the observation point toward the colorimetric plane at a second camera angle to record the positions of the second calibration edge and the second reference edge. The second included angle is calculated based on the positions of the camera lens, the second calibration edge, and the second reference edge; and Based on the second included angle, determine whether to adjust the second camera angle of the camera lens.

14. The method of use as claimed in claim 12, wherein the indicator color block has a third reference edge and a third reference width perpendicular to the third reference edge; wherein the second tilt indicator is connected to the first tilt indicator, the second tilt indicator includes a third calibration edge, wherein the third calibration edge has a third distance from the colorimetric plane, and the third calibration edge is perpendicular to the first calibration edge; wherein, The third virtual extension line from the observation point through the third calibration edge and the third reference edge has a third critical angle with the normal of the colorimetric plane.

15. The method of use as described in claim 14, further comprising: The camera lens is pointed at the colorimetric plane at a third camera angle to record the positions of the third calibration edge and the third reference edge; The third included angle is calculated based on the positions of the camera lens, the third calibration edge, and the third reference edge; and Based on this third included angle, determine whether to adjust the third camera angle of the camera lens.

16. The method of use as claimed in claim 11, wherein the first tilt indicator is circular and includes a circular through-hole, wherein the first calibration edge is the periphery of the circular through-hole.

17. The method of use as claimed in claim 11, wherein the body further includes a colorimeter holding area for holding a colorimeter, wherein the colorimeter is adjacent to the neighboring colorimetric object.

18. The method of use as claimed in claim 11, wherein the body comprises: The base plate, the first side wall, and the support wall are provided. The base plate connects the support wall and the first side wall. The first tilt indicator is connected to and perpendicular to the first side wall. The colorimetric plane is disposed on the support wall and perpendicular to the base plate.

19. The method of use as claimed in any one of claims 11 to 17, wherein the color calibration fixture further includes a primary color card, the color matching plane and the indicator color block are disposed on the primary color card, wherein the primary color card is detachably assembled to the body, and the primary color card is assembled to the body before the color calibration fixture is placed on the adjacent color matching object.

20. The method of use as claimed in claim 19, wherein the body includes a baffle, and the surface of the baffle contacts the primary color card and coincides with the colorimetric plane.

Images