A handful of photos yields a mouthful of (digital) teeth

December 05, 2016

A Disney Research team has developed a model-based method of realistically reconstructing teeth for digital actors and for medical applications using just a few, non-invasive photos or a short smartphone video of the mouth.

This new method can digitally reconstruct teeth even though some teeth are obscured in the photos or videos by the edges of the mouth or by other teeth.

"Image-based reconstructions of the human face have grown increasingly sophisticated and digital humans have become ubiquitous in everyday life," said Markus Gross, vice president for Disney Research. "By combining creativity and innovation, this research continues Disney's rich legacy of leveraging technology to enhance the tools and systems used to create more realistic and believable digital actors for films or video games."

The researchers - from Disney Research, ETH Zurich and the Max Planck Institute for Informatics - will present the new method for teeth reconstruction at the ACM SIGGRAPH Conference on Computer Graphics and Interactive Techniques in Asia, taking place in Macao Dec. 5-8.

According to Thabo Beeler, a Disney research scientist, camera-based reconstructions have been problematic as what makes pearly whites pearly also makes them hard to capture in images -- their translucent enamel and the diffuse underlying dentine. It's also difficult to get people to open their mouths wide enough to provide cameras with an unobstructed view.

"On the upside, teeth are rigid and their shape variation from person to person is manageable," Beeler said, "and as such teeth render themselves well to statistical modeling."

To create their method, the researchers first constructed a model of human teeth rows, using high-resolution 3D scans of 86 different teeth rows from the field of human dentistry.

From this training data, a model of an average tooth row was created and natural variations in shape and spacing were calculated for each tooth.

Though imaging teeth in great detail is technically difficult, the researchers developed a way to recognize their edges - where teeth meet each other, meet the gums and meet the lips. With these outlines, obtained from several photos from different angles of a person's mouth in a natural pose or from video taken while moving a smartphone from side to side, the model can be fitted to the person's teeth.

In this way, the entire tooth row - including teeth entirely blocked from view of the camera - can be reconstructed from the model.

In a final step, natural coloring of the person's teeth can be overlaid on the teeth reconstruction, providing a realistic looking set of teeth.

"Our algorithm only requires minimal user interaction and can operate on a set of individual, non-calibrated images, making teeth capture as easy and convenient as taking a few pictures or even a short video clip from a standard mobile phone," Beeler said.
-end-
In addition to Beeler and Gross, the research team included Derek Bradley from Disney Research, Chenglei Wu of ETH Zurich, as well as Pablo Garrido, Michael Zollhöfer and Christian Theobalt of the Max Planck Institute for Informatics.

For more information and a video, please visit the project website at https://www.disneyresearch.com/publication/model-based-teeth-reconstruction/.

About Disney Research


Disney Research is a network of research laboratories supporting The Walt Disney Company. Its purpose is to pursue scientific and technological innovation to advance the company's broad media and entertainment efforts. Vice Presidents Jessica Hodgins and Markus Gross manage Disney Research facilities in Los Angeles, Pittsburgh and Zürich, and work closely with the Pixar and ILM research groups in the San Francisco Bay Area. Research topics include computer graphics, animation, video processing, computer vision, robotics, wireless & mobile computing, human-computer interaction, displays, behavioral economics, and machine learning.

Website: http://www.disneyresearch.com
Twitter: @DisneyResearch
Facebook: http://www.facebook.com/DisneyResearch

Disney Research

Related Smartphone Articles from Brightsurf:

Mobile smartphone technology is associated with better clinical outcomes for OHCA
Mobile smartphone technology can accelerate first responder dispatch and may be instrumental to improving out?of?hospital cardiac arrest (OCHA) survival.

New tool can diagnose strokes with a smartphone
A new tool created by researchers at Penn State and Houston Methodist Hospital could diagnose a stroke based on abnormalities in a patient's speech ability and facial muscular movements, and with the accuracy of an emergency room physician -- all within minutes from an interaction with a smartphone.

App analyzes coronavirus genome on a smartphone
A team led by Garvan's Dr Ira Deveson developed the app 'Genopo' that can analyse the coronavirus genome on a portable Android device.

Smartphone accelerometers could help in resistance workouts and rehabilitation protocols
Smartphone accelerometers are effective tools to measure key time-under-tension indicators of muscle training -- and could help in resistance-based workouts and rehabilitation protocols.

Parents' smartphone use does not harm parent/child relationships
Contrary to popular views, parental smartphone use is rarely associated with poor parenting, and more often than not, tends to be associated with warm and attached parenting.

The effects of smartphone use on parenting
Parents may worry that spending time on their smartphones has a negative impact on their relationships with their children.

Inexpensive retinal diagnostics via smartphone
Retinal damage due to diabetes is now considered the most common cause of blindness in working-age adults.

Nanosensor can alert a smartphone when plants are stressed
MIT engineers can closely track how plants respond to stresses such as injury, infection, and light damage using sensors made of carbon nanotubes.

Smartphone apps not accurate enough to spot all skin cancers
Smartphone apps that assess the risk of suspicious moles cannot be relied upon to detect all cases of skin cancer, finds a review of the evidence published by The BMJ today.

Detecting mental and physical stress via smartphone
The team led by Professor Enrico Caiani of the Department of Electronics, Information and Bioengineering at Politecnico di Milano, Italy, has shown that it is possible to use our smartphones without any other peripherals or wearables to accurately extract vital parameters, such as heart beat rate and stress level.

Read More: Smartphone News and Smartphone Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.