Haptics‘ Touch the virtual’ By Priya Shetty III MCA Mangalore University
‘Haptics’ is derived from the Greek word ‘haptikos’which means – ‘being able to come into contact’THE SCIENCE OF TOUCH
Basic idea• Haptics, is the technology of adding the sensation of touch and feeling to computers.• A haptic device gives people a sense of touch with computer-generated environments, so that when virtual objects are touched, they seem real and tangible.• Understanding and enabling a compelling experience of Presence not limited to "being there", but extended to "being in touch" with remote or virtual surroundings. 3
•Haptic technology refers to technology that interfaces the user with a virtual environment via the sense of touch by applying forces, vibrations, and/or motions to the user.•This mechanical stimulation may be used to assist in the creation of virtual objects (objects existing only in a computer simulation), for control of such virtual objects, and to enhance the remote control of machines and devices (teleoperators). 4
History of Haptics• In the early 20th century, psychophysicists introduced the word haptic to label the subfield of their studies that addressed human touch-based perception and manipulation.• In the 1970s and 1980s, significant research efforts in a completely different field,robotics also began to focus on manipulation and perception by touch. Initially concerned with building autonomous robots, researchers soon found that building a dexterous robotic hand was much more complex and subtle than their initial naive hopes had suggested. 5
•In the early 1990s a new usage of the word haptics began toemerge. The confluence of several emerging technologiesmade virtualized haptics, or computer haptics possible.•Much like computer graphics, computer haptics enables thedisplay of simulated objects to humans in an interactivemanner. However, computer haptics uses a display technologythrough which objects can be physically palpated. 6
Basically a haptic system consist of two parts namely thehuman part and the machine part. In the figure shown above,the human part (left) senses and controls the position of thehand, while the machine part (right) exerts forces from thehand to simulate contact with a virtual object. Also both thesystems will be provided with necessary sensors, processorsand actuators. In the case of the human system, nervereceptors performs sensing, brain performs processing andmuscles performs actuation of the motion performed by thehand while in the case of the machine system, the abovementioned functions are performed by the encoders,computer and motors respectively. 8
Areas of Haptics• Human Haptics• Machine Haptics• Computer Haptics 9
Virtual Reality• Virtual reality is a form of human - computer interaction providing a virtual environment that one can explore through direct interaction with our senses.• It’s only an imitation of the real world. 10
The real world• User should be able to touch the virtual object and feel a response from it.• In order to complete the imitation of the real world one should be able to interact with the environment and get a feedback.• This feedback is called Haptic Feedback 11
The TechnologyHaptics is implemented through different type ofinteractions with a haptic device communicating withthe computer. These interactions can be categorizedinto the different types of touch sensations a user canreceive:• Tactile feedback• Force feedback 12
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. 13
Force feedback• It reproduces the directional forces that can result from solid boundaries.• E.g. the weight of virtual objects. 14
Haptic devicesIt allows users to touch, feel and manipulate3-D objects in virtual environments. 15
How are Haptic devices different?• Common interface devices like mouse and joystick are only input devices. No feedback.• Haptic devices are input-output devices. 16
Phantom device• Developed by a company named Sensable technologies.• It works by monitoring the position of a users fingertip or hand through optical encoders attached to the device• The geometric, meterial, and dynamic properties of the world we wish to represent can be modeled and stored. PHANTOM® interface from Sensable Technologies 17
Cyber Grasp Immersion CorporationThis device fits over the users entire handlike an exoskeleton and adds resistive forcefeedback to each finger. 18
Force Feedback• Connected to computer systems applying forces to simulate the sensation of weight and resistance providing information to the user.• Input from the user in the form of hand, or other body segment whereas feedback from the computer or other is in the form of force or position. Force FeedBack By Logitec 19
Magnetic Levitation Haptic Interfaces A technology for feeling sensation over total body 20
Exoskeletons• large and immobile systems that the user must attach him or herself to.• their large size and immobile nature allow for the generation of large and varied force information. 21
Gaming ApplicationIn various sports games, Altogether, more than 500 gamesuse force feedback, and more than 20 peripheralmanufacturers now market in excess of 100 hapticshardware products for gaming. Novint Falcon haptics controller 23
Surgery• physical interactions needed to become skilfull in their art. A computer based teaching tool has been developed using haptic technology to train veterinary students to examine the bovine reproductive tract, simulating rectactal palpation. The student receives touch feedback from a haptic device while palpating virtual objects. The teacher can visualize the students actions on a screen and give training and guidance. 24
MobIiesSamsung has made a phone, which vibrates, differentlyfor different callers. Motorola too has made hapticphones. Nokia and Prada Implemented using piezoelectric sensor pads 25
Military Training• Specialized military training can be very expensive, particularly for vehicle pilots. Some training procedures have an element of danger when using real situations.• While the initial development of virtual reality gear and software is expensive, in the long run it‘s much more cost effective than putting soldiers into real vehicles or physically simulated situations.• Virtual reality technology also has other potential applications that can make military activities safer.
Haptic torch for the blind• The device, has used in a torch, detects the distance to objects, while a turning dial on which the user puts his thumb indicates the changing distance to an object. The pictured device was tested and found to be a useful tool.
ADVANTAGES• Communication is centered through touch and the digital world can behave like the real world.• Working time is reduced since objects can be captured, manipulated, modified and rescaled digitally.• Medical field simulators allow would be surgeons to practice digitally, gaining confidence in the procedure before working on breathing patients.• With haptic hardware and software, the designer can maneuver the part and feel the result, as if he/she were handling the physical object.
Disadvantages(areas of improvement)• Expensive in some cases.• Debugging issues—these are complicated.• Haptic device position sensors have finite resolution.• The precision of touch requires a lot of advance design. With only a sense of touch, haptic interfaces cannot deliver warnings.• Haptics applications can be extremely complex, requiring highly specialized hardware and considerable processing power.
Conclusion • Haptic is the future for online computing and e-commerce, it will enhance the shopperexperience and help online shopper to feel themerchandise without leave their home.• Large potential for applications in critical fields as well as for leisurely pleasures.• Haptic devices must be smaller so that they are lighter, simpler and easier to use.• With many new haptic devices being sold to industrial companies, haptics will soon be a part of a person’s normal computer interaction.