SPStudio Chris Johnston. What? SPStudio Tool to gather 3D data from digital photographs. Stereo Photogrammetry Give a computer depth perception. Stereo.

SPStudio

Chris Johnston

What?

SPStudio Tool to gather 3D data from digital photographs.

Stereo Photogrammetry Give a computer depth perception.

Stereo Correspondence The use of 2D image data to determine a point’s

location in 3D space. Volumetric Reverse Multiple Correspondence

Algorithm Finds corresponding volume. Takes a point in 3D space and determines its location

within the images.

Functions

Save progress at any time Fully graphical View finalized data set Estimated time of algorithm completion Change image file associations any time before the

algorithm is run Change camera information at any time before the

algorithm is run Produce a 3D data set that is a reasonable

representation of the object captured in the photos Provide a multiple document interface environment

Specifications

Development Environment Visual Studio .NET 2003 C#

Minimum System Requirements .NET Runtime Environment 256 MB RAM 1.2 GHz processor 32 MB accelerated graphics card with

OpenGL support

Why?

Current Modeling Methods Require a degree in themselves Vertex by vertex data entry Geometric primitive data entry

SPStudio User-friendly Quick No artistic ability required Inexpensive

Who?

Students Weekend programmers New companies The artistically or financially

challenged

How?

Current Algorithms Object Specific Large amount of user input High risk of bad data entry

Volumetric Reverse Multiple Correspondence Algorithm Given a volume in 3D space, does this

volume correspond to the volume of the object photographed?

Small and simple data input Lower chance of bad data entry

Algorithm Data Input

User takes photographs of objectMust be same distance from objectFirst photo is the reference photo and

is treated as taken from 0 degreesEach photo after that must be

assigned a degree with regard to the reference photo (clockwise rotation of object)

Example Photos

Silhouette Data Input Method

Algorithm Simplified

Shift Phase

Post Shift

Voxel Representation

Where’s the “any” key?

I am a user. You are and application. I shall destroy you!I will enter a word when you ask for a

number.I will enter a document when you ask

for an image.I will do everything you do not want

me to do.

Protecting the User from themselves

More Protection

Even MORE Protection

Are we there yet?

Current IssuesRefresh fault due to C#’s component

threading system.

System Layout

Finalizing

Record the intersection data from the 4 shift voxel data sets in a simple format

Issues During Development

Having a working prototype doesn’t mean you are almost done!

It is hard to be a developer and think like a user.

Pass by reference decreases memory usage and increases aspirin usage.