JP3034716B2 - Shape representation method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for expressing a shape in a graphic system for expressing a shape, and more particularly to a set of three-dimensional coordinate data indicating the position of a sample point on the surface of an object and a connection of the three-dimensional coordinate data. The present invention relates to a display technique for modeling and rendering using computer graphics by using surface description data representing a surface shape of the object and data representing a three-dimensional shape by attribute data of the surface shape.

[0002]

2. Description of the Related Art In this type of conventional shape representation method, a new set of three-dimensional coordinate data and a new surface description data are generated from a set of a plurality of three-dimensional coordinate data and surface description data. To generate new attribute data,
When displaying a shape using this new shape representation, there is a drawback that the original set of three-dimensional coordinate data and the relationship between the surface description data and the attribute data cannot be referenced.

[0003]

SUMMARY OF THE INVENTION The present invention solves this problem, and when a set of a plurality of three-dimensional coordinate data exists, an integrated shape thereof can be immediately displayed, and the relation between them can be displayed. The purpose is to be able to refer to

[0004]

According to the present invention, there is provided a set of three-dimensional coordinate data representing a position of a sample point on a surface of an object;
It has surface description data representing the surface shape by concatenating the three-dimensional coordinate data, and attribute data for each of the surface shapes. When the reliability of the shape is added, if a plurality of sets of three-dimensional coordinate data and surface description data exist, they are integrated based on the reliability and the resulting three-dimensional shape is displayed.

[0005]

The differences between the features of the present invention and the prior art are as follows. Originally, the existence of multiple 3D coordinate data in a 3D shape is because the target object is measured from various angles or measured by various methods, and by integrating them, the 3D shape of the target object is obtained. This is for generating three-dimensional coordinate data. Therefore,
Each of the three-dimensional coordinate data has an overlapping portion, and when there is a lot of data having an overlapping portion, one of the three-dimensional coordinate data is finally used by using an effective portion from among them. Three-dimensional coordinate data representing the shape was generated and displayed.

On the other hand, according to the shape expression method of the present invention, the surface shape is represented by a set of three-dimensional coordinate data representing the positions of sample points on the surface of the object and the concatenation of the three-dimensional coordinate data. In the shape representation method with surface description data and attribute data of each surface shape, the integration result of 3D coordinate data is displayed by adding the reliability of the surface shape as one of the attributes in the attribute data In doing so, the individual data sets are displayed and synthesized based on the reliability, so that modeling and rendering can be performed as a result of visual integration.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an example will be described in which a slit light projection type shape measurement using a laser and a boundary shape measurement using a silhouette are used in a three-dimensional shape measurement device capable of simultaneously measuring the shape and the surface luminance. Here, an example in which the shape and surface luminance are measured by rotating the periphery of the measurement object horizontally by 360 degrees, and an example in which two data are integrated will be described. It is needless to say that the present invention is not limited to this.

First, for a human head in a three-dimensional shape measuring apparatus, FIG. 2A shows a set of three-dimensional coordinate data measured using a laser and a surface shape (A) 10 based on surface description data. The surface luminance data (A) 11 as the attribute is shown. Here, in the surface shape (A) 10, the hair portion has low luminance (shown by oblique lines in the surface luminance data 11), and the shape is unstable due to a small amount of laser reflected light, and noise occurs. It has a shape like that.

Next, for the same object, FIG.
2 shows a set of three-dimensional coordinate data measured using a silhouette, a surface shape (B) 20 based on surface description data, and surface luminance data (B) 21 as its attribute. According to the silhouette, the same surface luminance data 21 as in FIG. 2A is obtained, but the cheek region cannot be measured correctly due to the nose-shaped silhouette, as in the surface shape 20, and the ear region cannot be measured. Incorrect shape.

FIG. 1 shows a block configuration for integrating the respective three-dimensional coordinate data shown in FIGS. In the surface luminance data 11 shown in FIG. 2A, a reliability (A) 30 is given so as to assume a high luminance portion as accurate three-dimensional coordinate data. The reliability (B) 31 is given so that a low-luminance portion becomes accurate three-dimensional coordinate data.

In FIG. 1, 32 and 33 are 3
Drawing units (A) and (B) that generate respective shapes from a surface shape 10 and a surface shape 20 represented by a set of dimensional coordinate data and surface description data. The integration unit 34 is a unit that combines the drawing results of the drawing units 32 and 33 based on the values of the reliability 30 and 31. As a result, as shown in FIG. 2C, the display device 35 can display the shape 36 composed of appropriate portions of the measurement results of FIGS. 2A and 2B. In the shape 36 composed of the appropriate portion, the region of the hair, the region of the ear, and the region of the cheek are appropriately displayed.

The integrated unit 34 can be realized in a manner suitable for hardware by using a method called alpha blending in the existing graphics method.

In addition, in this manner, in the display of the shape 36 composed of appropriate portions, it is possible to know how the components are combined from the integration status of the integration unit 34, so that the reliability (A) It is possible to obtain an association between the number 30 and the reliability (B) 31.

FIG. 3 shows a configuration example of the integration unit 34 shown in FIG. As shown in FIG.
4 is the reliability A and the reliability B of the surface shape to be integrated.
To obtain values α _A and α _B obtained by normalizing them. The values are α _A = A / (A + B) and α _B = B / (A + B). Then, from the drawing unit (A) 32, the drawing unit (B) 33, a pixel value I _A respectively, entering I _B, and integrate them by alpha blending unit 40, a new pixel value I.

The alpha blending unit 40 includes:
As shown in FIG. 3 (b), for example, by multiplying the pixel value I _A and the normalized reliability alpha _A in multiplier 41A, and in the multiplier 41B reliability alpha _B was pixel value I _B and the normalized The multiplication is performed, and the result is added by the adder 42. Thus, pixels I of the integration result is _{I = I A * α A +} I B * α B. This is performed for all pixels.

[0016]

As described above, according to the shape expression method of the present invention, when a set of a plurality of three-dimensional coordinate data exists, a shape obtained by integrating them can be displayed immediately. You can also refer to associations.

[Brief description of the drawings] [Explanation of symbols]

FIG. 1 is a diagram showing a block configuration of an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a surface shape and surface luminance data.

FIG. 3 is a diagram illustrating a configuration example of an integrated unit illustrated in FIG. 1;

[Explanation of symbols]

 Reference Signs List 10 Surface shape (A) 11 Surface luminance data (A) 20 Surface shape (B) 21 Surface luminance data (B) 30 Reliability (A) 31 Reliability (B) 32 Drawing unit (A) 33 Drawing unit (B) 34 integrated unit 35 display device 36 shape composed of appropriate parts 40 alpha blending unit 41A, 41B multiplier 42 adder

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-192473 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G06T 15/00

Claims (1)

(57) [Claims] 1. A set of three-dimensional coordinate data representing the position of a sample point on the surface of an object, surface description data representing the surface shape by concatenating the three-dimensional coordinate data,
A shape expression method in a graphic system for representing a shape having attribute data of each of the surface shapes, wherein a reliability of the surface shape is added to the attribute data, and a set of the three-dimensional coordinate data and a surface If there are multiple descriptive data, pixel values obtained from each of them
Are integrated by weighting based on their reliability .
A shape expression method characterized by displaying a three-dimensional shape as a result.