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TACTILE RENDERING FOR TOUCH SURFACE IN A VIRTUAL SHOPPING STORE

- RAJAT DHASMANA

- 1DS11IS069

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( VIRTUAL STORE)In Virtual Store smartphone users can photograph the bar code of life-size pictures, on the walls and platform screen doors, of 500 items of food, toiletries, electronics etc, for delivery within the same day.

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Problems Faced In Supermarket

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How It Works

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TOUCH SURFACE

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What Is Haptics ?

Haptics’ is derived from the Greek word ‘haptikos’which means – ‘being able to come into contact’.

Haptics is the science of applying touch (tactile) sensation and control to interact with computer applications.

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Haptics

Haptics is implemented through different type of interactions with a haptic device communicating with the computer. These interactions can be categorized into the different types of touch sensations a user can receive: 1)Tactile Feedback 2)Force Feedback

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Tactile Feedback

Refers to the sensations felt by the skin.

It allows the user to feel things such as the texture of surfaces, temperature and vibration.

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Force Feedback

It reproduces the directional forces that can result from solid boundaries.

E.g. the weight of virtual objects, inertia, etc.

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This technology takes advantage of the sense of touch by applying forces, vibrations, or motions to the user.

IT gives people a sense of touch with computer-generated environments, so that when virtual objects are touched, they seem real and tangible.

Tactile Rendering

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Tactile Rendering

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What Is Rendering? Rendering in a Computer Graphics is a Process of generating an image from a 2D or 3D model.

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TACTILE DISPLAY

Tactile Displays are based on :

Electrovibration Effect

Tactile Rendering Algorithm

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Electrovibration

Traditional Electro-mechanical actuators Electrovibration Display

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In tactile displays based on an electrovibration effect the friction between

the sliding finger and the touch screen is produced by injecting a periodic

electrical signal into a conductive electrode coated with a thin dielectric

layer.

The periodic signal creates an alternating electrostatic force that

periodically attracts and releases the finger from the touch surface,

producing friction-like rubbery sensations.

Principle of Electrovibration

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1) Calculate the gradient of the virtual surface we want to render

2) Determine the “dot product” of the gradient of the virtual surface and velocity of the sliding finger

3) Map the dot-product to the voltage and then the amplitude of

the voltage that is injected into the tactile device.

Tactile Rendering Algorithm

Perc

eive

d F

rictio

n

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Rendering tactile bumps on touch screensResistive forces on the fingertip are proportional to the local gradient of the geometric shape displayed on a touch screen, i.e., the steeper the bump – the higher the resistance forces felt on the finger.

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APPLICATIONS Depth Maps

Teleoperation or Telerobotics

Computer Games

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ADVANTAGES

Inexpensive

Lightweight

Generates rich and effective tactile sensations

for lateral friction displays.

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Tactile Feedback interfaces can only exert forces with limited magnitude and not equally well in all directions.

Rendering algorithms operate in discrete time whereas users operate in continuous time.

LIMITATIONS

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FUTURE VISION1.Military Application The soldiers can prepare themselves for battle from learning how to defuse bomb to operating a helicopter.

2.Medical Application Use of a central workstation from which surgeons would perform operations in various locations; with machine setup and patient preparation performed by local nursing staff .

3. Textile Industry User could study and feel the texture and quality of material during the sale of cloth through internet.

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CONCLUSIONS Tactile-Rendering algorithm simulates geometric

features such as bumps on flat touch surfaces using

only lateral resistance forces produced by the

electrovibration effect.

We can create a realistic and convincing tactile

sensations of 3D bumps on a variety of visual

content, including photos and 3D models. This

functionality can be easily incorporated into touch-

based interfaces and allow for the creation of

effective and engaging tactile user experiences.

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Any Queries

Thank You