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Lecture series. Topic Covers: Introduction to MT technologies, MT hardware tracking technique, Hardware equipments, Optical tracking techniques.
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Lecture 2 : Multi-touch technologies: Hardware and optical techniques
By Jazmi Jamal
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Outline
Introduction to multi-touch technologies
Multi-touch hardware tracking technique
Hardware: Display screen, input sensor, & computer processor.
Optical techniques: DI, FTIR, LLP, DSI, LED-LP
Multi-touch refers to a touch system's ability to simultaneously detect and resolve a minimum of 3 or more touch points. Multi-touch is considered by many to become a widely-used interface mainly because of the speed, efficiency and intuitiveness of the technology.
History of multi-touch
1980 2008
First MT display Toronto University
HP 150 worlds first touchscreen PC
Simon – first smartphone with touchscreen
Mitsubishi : Diamond Touch
Uni of Toronto; Multi-finger, hand, UI
Jeff Han: Budget MT
Foundation NUI group
Apple: iPhone
Microsoft Surface
20
08
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07
20
06
20
06
20
03
20
01
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92
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83
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82
For more info: http://www.billbuxton.com/multitouchOverview.html
igital computer capable of being reprogrammed to solve a full range of computing problems
HP 150
HP Touch Computer, 1983http://www.youtube.com/watch?v=X-THdG5gVTw
igital computer capable of being reprogrammed to solve a full range of computing problems
Simon: 1st smartphone with touchscreen
IBM, 1992No physical button to dial.
igital computer capable of being reprogrammed to solve a full range of computing problems
Diamond Touch
Mitsubishi, 2001Projection on coffee table
igital computer capable of being reprogrammed to solve a full range of computing problems
Budget Multi-touch
Jeff Han @ TEDTalk, 2006http://www.ted.com/talks/jeff_han_demos_his_breakthrough_touchscreen.html
igital computer capable of being reprogrammed to solve a full range of computing problems
tBeta / CCV
NUI Groups, 2006Open source multi-touch
iPhone
Apple, 2007Multi-touch smartphone
Microsoft Surface
Microsoft, 2008Multi-touch interface tabletop
Enough History!
Multi-touch Hardware Technology
Multi-Touch Hardware Tech
Touch Technology
Optical (this is my topic)
Infrared (IR)
Bending Wave
Projected Capacitive
Resistive
Surface Acoustic Wave (SAW)
Surface Capacitive
Established a group of 2 or 3 then discuss and present the existing touch technologies.
Multi-Touch Hardware Tech
The criterions
What is it ?
How is the technology function ?
How much is the price ?
Sample product using the technology
What is your comment regarding this technology ?
Please apply multimedia materials in performing the presentation.
Provide evidence and reference regarding the content.
These are some questions require to be answered in the presentation
Presentation time: 10 mins
Optical (for example)
What ?
Optical or light sensing MT was based on optical sensor (normally camera).
nuicode.com/attachments/.../Multi-Touch_Technologies_v1.01.pdf
Optical (for example)
Function
The technique consists of optical sensor, infrared light source, and display.
nuicode.com/attachments/.../Multi-Touch_Technologies_v1.01.pdf
Optical (for example)
Price
Low cost
Range from RM 200-500 excluding computer and display projector.
http://www.instructables.com/id/How-To-Build-An-Optical-Multitouch-Setup-FTIR-Re/
Optical (for example)
Sample product
Prudential MT coffee table
http://www.youtube.com/watch?v=Yn_j8s4SWZM
Optical (for example)
Comment
-The cheapest technology setup, because most of the equipments are available in the market.
- Hard to setup, requires lot of hassle.
20 minutes. Start from NOW!
OK, done presentation, NEXT!
Optical hardware time!
Optical Hardware
Optical technology hardware consists of:
Infrared light sources & infrared cameras
Display : Projector and surface.
Infrared Light Sources
Infrared is a portion of the light spectrum that lies just beyond what can be seen by the human eye.
IR light is mainly used to distinguish between a visual image on the touch surface and the finger(s) being tracked.
Infrared Light SourcesIR Light Sources:
Single LED LED illuminator LED Ribbon IR Laser
Infrared Camera
Commercial Infrared camera : Security cam, camcorder, nightvision, spycam.
Normal Webcam camera with modification (take out IR filter inside the camera).
Camera specs need to be considered:
Resolution, Frame rate, Interface, Lens type, Bandpass filter
Projector (Display)
Display visual feedback on table.
Display versatile size.
2 types of projectors: DLP and LCD
Important: Brightness (ANSI Lumens), Throw Distance, Aspect Ratio
Projection surface (Display)
Light diffuser: device that diffuses or spreads out or scatters light.
Semi-transparent surface or transparent surface that can capture light.
For instance:
http://www.da-lite.com/products/product.php?cID=10&pID=335
Need a break ?
Continue to Optical Technique
Optical Techniques
Composition of optical-based multi touch technology in making it function.
Establish a group of 3 or 4 members. Discuss and present about the existing optical techniques
Diffused Illumination (DI)
Frustrated Total Internal Reflection (FTIR)
Laser Light Plane (LLP)
Diffused Surface Illumination (DSI)
LED Light Plane (LED-LP)
Optical Techniques
Please apply multimedia materials in performing the presentation.
Provide evidence and reference regarding the content.
These are some questions require to be answered in the presentation
Presentation time: 15 mins
The questions
What is the ___ technique ?
What equipments is required ?
How to setup ?
What are pros n cons of the technique ?
What ?
IR light is shined at the screen from below the touch surface
Object touches the surface it reflects more light than the diffuser in the background
The extra light is sensed by a camera.
http://wiki.nuigroup.com/Diffused_Illumination
Diffused Illuminator
http://wiki.nuigroup.com/Diffused_Illumination
DI Equipments
Equipment Product/Model Comments
IR CameraPS3 ToyCam (Modified)
Remove filter and replace with IR filter. Extend lens.
LED Illuminator TZOR - 001 Add light diffuser to soften the light
Projector BenQ MP512-STDLP short throw projector. 1300 ANSI Lumen
Projection SurfaceAcrylic glass with frost laminate
20-30% transparency
Optical Techniques
DI: Advantages & Disadvantages
Advantages Disadvantages
Not much hassle; just a diffuser/projection surface on bottom.
Difficult to get even illumination
Can use any transparent material like glass (not just acrylic).
Blobs have lower contrast
Can track objects, fingers, visual markers and hovering.
Greater chance of false blobs
Enclosed box is required
nuicode.com/attachments/.../Multi-Touch_Technologies_v1.01.pdf
OK YOUR TURN! 20 mins
Finish! Q&A session