In order to reproduce a three-dimensional shape of an object accurately while maintaining measuring accuracy and high speed, in a three-dimensional measuring method of projecting a stripe pattern having colored stripes on the object and measuring the three-dimensional shape of the object based on stripe positions on the imaged image corresponding to the stripes on the stripe pattern, colors of the stripes on the stripe pattern are set according to a predetermined rule, and a plurality of stripes having a predetermined positional relationship are extracted from the image, and correspondence with stripes on the stripe pattern based on the color arrangement of the extracted plural stripes.
The present invention is a measurement method of three-dimensional profiles and a reconstruction system thereof using subpixel localization with color gratings and picture-in-picture switching on a single display, wherein the measurement method includes: 1. Preparation step; 2. Projection step; 3. Image extraction step; 4. Image fine-tuning step; 5. Image processing step; and 6. Reconstruction step. The system includes: a projection apparatus, emitting a grating towards a workpiece under measurement, and forming a grating image on the workpiece under measurement, the contrast values of the plurality of grating stripes of the grating image being identical; a central processing unit, using the grating image and picture-in-picture of a display thereof to fine tune and reconstruct three-dimensional profiles of the workpiece under measurement. Thereby, the grating stripes have equal contrast for easier identification; the display has switchable picture-in-picture; and an adjustment module can adjust the grating.
A method of acquiring 3D color information and a 3D color information acquisition apparatus, suitable for obtaining a 3D model of an object, use a pattern light source to acquire topography data for the object. More than 3 basic colors are used to construct the pattern to increase resolution with great number of color combination. According to the color composition and combination, color distortion caused by model projection can be prevented, thereby increasing the reliability and broadening the application of the color acquisition device and method.
In a method of imaging an object, for dental purposes, comprises: a) projecting a striped pattern on to the object to be imaged, b) recording the projected striped pattern as a basic image (R.sub.i) with a camera, steps a) and b) being carried out at a number of different positions of the phase relationship of the striped pattern, and c) computing an image of the object from the plurality of mutually out-of-phrase basic camera images. Provision is made for suppression of periodic disturbances in that, in step c), c.sub.1) at least two groups of basic images (R.sub.1, R.sub.2, . . . , R.sub.n; R.sub.2, R.sub.3, . . . , R.sub.n+1) are formed from the basic camera images (R.sub.1, . . . , R.sub.m), c.sub.2) a phase related image (Pj) of the object to be imaged (20) is computed from each group of basic images (R.sub.1, R.sub.2, . . . , R.sub.n; R.sub.2, R.sub.3, . . . , R.sub.n+1), c.sub.3) the computed phase related images (P.sub.1, P.sub.2) are averaged such that a phase related image (P) having a reduced amount of noise is formed, and that c.sub.4) an image of the object is computed from the phase related image (P) having a reduced amount of noise.
