Now feel images on smart phone touch screens
Indian express
Smartphone users can now 'feel' images and objects seen on their touchscreen!
In a game-changing invention, engineers at Disney Research, Pittsburgh, have
developed a new technique that allows you to feel the texture of objects seen
on a flat touchscreen.
The novel algorithm enables a person sliding a finger across a topographic map
displayed on a touchscreen to feel the bumps and curves of hills and valleys,
despite the screen's smooth surface.
The technique is based on the fact that when a person slides a finger over a
real physical bump, he perceives the bump largely because lateral friction
forces stretch and compress skin on the sliding finger.
By altering the friction encountered as a person's fingertip glides across a
surface, the Disney algorithm can create a perception of a 3D bump on a touch
surface.
The method can be used to simulate the feel of a wide variety of objects and
textures.
"Our brain perceives the 3D bump on a surface mostly from information that it
receives via skin stretching," said Ivan Poupyrev, who directs Disney Research,
Pittsburgh's Interaction Group.
"Therefore, if we can artificially stretch skin on a finger as it slides on the
touchscreen, the brain will be fooled into thinking an actual physical bump is
on a touchscreen even though the touch surface is completely smooth," Poupyrev
said in a statement.
In experiments, researchers used electrovibration to modulate the friction
between the sliding finger and the touch surface with electrostatic forces.
Researchers created and validated a psychophysical model that closely simulates
friction forces perceived by the human finger when it slides over a real bump.
The model was then incorporated into an algorithm that dynamically modulates
the frictional forces on a sliding finger so that they match the tactile
properties of the visual content displayed on the touchscreen along the
finger's path.
A broad variety of visual artifacts thus can be dynamically enhanced with
tactile feedback that adjusts as the visual display.
"The traditional approach to tactile feedback is to have a library of canned
effects that are played back whenever a particular interaction occurs," said
Ali Israr, a Disney Research, Pittsburgh research engineer who was the lead on
the project.
"This makes it difficult to create a tactile feedback for dynamic visual
content, where the sizes and orientation of features constantly change. With
our algorithm we do not have one or two effects, but a set of controls that
make it possible to tune tactile effects to a specific visual artifact on the
fly," Israr said.
The new research will be presented at the ACM Symposium on User Interface
Software and Technology in St Andrews, Scotland.
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With thanks and regards
(Rajesh Asudani)
Assistant General Manager
Reserve Bank of India
Nagpur
(In youth you want things, and then in middle-age you want to want them.)
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