Abstract
Structured-light technique is an effective method for indoor 3D measurement, but it is hard to obtain ideal results outdoors because of complex illumination interference on sensors. This paper presents a 3D vision measurement method based on digital image processing to improve resistance to noise of measuring systems, which ensuresnormal operation of a structured-light sensor in the wild without changing its components, and the method is applied in 3D reconstruction of snow sculpture. During image preprocessing, an optimal weight function is designed based on noise classification and minimum entropy, and the color images are transformed into monochromatic value images to eliminate most environmental noise. Then a Decision Tree Model (DTM) in a spatial-temporal context of video sequence is used to extract and track stripe. The model is insensitive to stubborn noise and reflection in the images, and the result of the model after coordinate transformation is a 3D point cloud of the corresponding snow sculpture. In experimental results, the root mean square (RMS) error and mean error are less than 0.722 mm and 0.574 mm respectively, showing that the method can realize real-time, robust and accurate measurement under a complex illumination environment, and can therefore provide technical support for snow sculpture 3D measurement.
Highlights
Digitalized archive of cultural relics and artworks has become an important means for their restoration and virtual museum construction thanks to the development of 3D measurement technique
By analyzing snow sculpture measurement in actual scene, we found the main noise is from sunlight, shadows, surface color, surface r2e. fMlecettihoonds,sand occasionally colored lights
The snow sculpture is large without a standard size, so the value measured by high-precision instrument is taken as the standard value, and the value measured by the method proposed in this paper is taken as the measurement value
Summary
Digitalized archive of cultural relics and artworks has become an important means for their restoration and virtual museum construction thanks to the development of 3D measurement technique. The first category is designed and constructed according to three-dimensional computer modeling, the 3D data of which is known in advance, meaning that there is no need to measure. The other category is works improvised according to shape and texture of snow billet and combined with surrounding scenes.Similar to other sculptures, they fuse the ideas and inspirations of artists. The category of snow sculpture is unique and needs to measure and record 3D data. Both snow sculpture designers and management companies want to obtain and store 3D data of each snow sculpture in the computer, thereby making it easy to reproduce the original appearance of snow sculpture through technologies such as 3D movie and 3D printing.
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