Enabling On-Set Stereoscopic MR-Based Previsualization for 3D Filmmaking

彬彬

1 Introduction

PreViz is a computer graphics movie that represents desired scenes

in preproduction and is useful for sharing the director’s imagination

among crews. Therefore, film industry looks upon PreViz as

one of the most important processes in filmmaking as the processes

become complicated [The Previs Society 2011]. Stereoscopic 3D

(S3D) movie production not only changed ways of expressiveness

but also changed ways of production and tools. Consequently, it

requires more careful planning and PreViz is still important. This

paper describes a prototype of S3D MR-PreViz system for HD S3D

PreViz shooting using mixed reality (MR) technologies in order to

facilitate PreViz making in S3D. This system is designed as an extension

of MR-PreViz for classic filmmaking [Ichikari et al. 2010].

Live-action shooting in S3D is still challenging in spite of knowhow

development. Developing intuitive interfaces, a motorized

stereo rig [Heinzle et al. 2011] and easy to use editing tools for

disparity adjustments [Koppal et al. 2011] are proposed. Our motivation

is, however, to offer stereographers the chance to examine

properties of a stereo rig and camerawork before production. In

this system, stereographers can shoot CGI characters acting on the

indoor and outdoor set and on a miniature by themselves. Creating

PreViz on their own, and not by animators, must be the most intuitive

way. In addition, using actual images embodies depth rather

concretely than usual PreViz in S3D.

2 A Workflow of S3D MR-PreViz

S3D MR-PreViz operates in the following procedures: landmark

DB (LMDB) cons***ction, setup of a 3D rig, calibration of the cameras

and MR-PreViz shooting. See below for further descriptions.

LMDB Cons***ction. This system uses a vision-based tracking

method using feature LMDB [Ichikari et al. 2010]. It is therefore

necessary to cons***ct the DB for real-time 3D match-move.

Setup of a Stereo Rig. Setup interaxial distance, convergence of a

rig and adjust disparities on a display.

Calibration of the Cameras. Opposed to usual MR systems with

a stereo camera such as HMD, use of rigs with controllers of interaxial

and convergence depicted in the left of Figure 1 often requires

calibration. Taking time for calibration leads to lost of chances of

examining other setups and cost directly. Thus, it is necessary to

finish calibration as quickly as possible in practice.

MR-PreViz Shooting. After the calibration, MR-PreViz shooting

begins. If the result is not expected due to incurrect setup of the rig,

it is possible to setup the rig again. Calibration automatically maps

the renewed setup to MR space for further examination.

In general, this system enables stereographers to repeat trial and

error for examining setups of rig properties and camerawork on a

3D display in real time by repeating calibration and shooting phases

after LMDB cons***ction phase. The system’s interfaces are depicted

in the middle of Figure 1. This system composes a PC size

workstation with a 3D display, rigs and calibration boards, and is,

therefore, portable.

彬彬

奇

庆佳节，千门赞国策； 迎新年，万户颂党恩。 政通人和，百业俱兴； 春暖花开，千山呈荣。 鞭炮齐鸣，一元复始； 笙簧迭奏，万象更新。

tc

路过、路过、快到鸟，列位请继续...ing

菜刀吻电线

我也来支持下

菜刀吻电线

真不错,全存下来了.

C.R.CAN

发了那么多，我都不知道该用哪个给你回帖了，呵呵

奇

真不错,全存下来了.

tc

很有心,部分已收录自用,谢谢

C.R.CAN

有意思！学习了！