By Katsushi Ikeuchi, Daisuke Miyazaki
Numerous cultural background gadgets around the globe are deteriorating or being destroyed as a result of paintings of average mess ups, similar to earthquakes and floods, and human-inflicted destruction, comparable to warfare and vandalism. within the wake of those threats, 3D information turns into a serious portion of completely recording the shapes of those very important items in order that they may be handed right down to destiny generations. Digitally Archiving Cultural items describes thorough examine and techniques for retaining cultural history gadgets by utilizing 3D electronic facts. those equipment have been constructed via utilizing desktop imaginative and prescient and special effects applied sciences. this information is also used for simulation and recovery reasons in addition to in the direction of numerous multimedia functions. This accomplished publication is prepared into 4 components. half 1 describes quite a few sensors designed to procure info. half 2 includes a selection of papers that describe the geometric pipeline, changing got info right into a constant geometric version, via picking relative kin between electronic info and connecting these info right into a uniform illustration. half three matters photometric matters, together with the best way to map colour images on a geometrical version and the way to take away the influence of sun within the photographs received. half four reviews at the attempt to set up a electronic museum to revive and reveal the unique visual appeal of history gadgets in addition to behavior analyses of got facts for background examine.
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Additional info for Digitally Archiving Cultural Objects
The sub unit is used for localizing the platform, and it repeats the scanning process in a parallel direction. By using the spatiotemporal range scans acquired from the sub unit, we can accurately estimate the motion of the moving platform, and a correct 3D model can be constructed from data scanned by the main unit. We applied this system to the Bayon Temple in Angkor Thom, Cambodia. The scanning results proved that the system gives an accurate 3D model, and that the system and the speed of the estimating process are effective.
The refined camera motion can be found through the minimization of a global functional. To minimize the function, the solution by the full-perspective factorization is utilized as the initial value to avoid local minimums. 1 Tracking Constraint As the most fundamental constraint, any interest point Sp must be projected at the coordinates (uf p, vf p) on each image plane. This constraint is well known as Bundle Adjustment . When the structure, motion and shape have been roughly obtained, this technique is utilized to refine them through the image sequence.
Some range sensors, such as Cyrax, have less accuracy in the depth dimension than in the 6 DIGITALLY ARCHIVING CULTURAL OBJECTS spanning dimensions, because the depth measurement is obtained by a laser returning a signal while the spanning dimensions are measured with encoders for mirror motions. Sagawa et. al. in Chapter 11 propose a method to reduce noise in range data by considering this anisotropic error distribution. Another issue in data error is how to fill small holes due to small occlusions.