Vclass Presentation Component

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Vclass Presentation Component

• Kanchana Kanchanasut, DEC Director
• Dr. Akavute Sujare, DEC Consultant
• Mr. Chaiwarat Chaiyapotpanit, Project Manager
• Distance Education Center (DEC)
• Asian Institute of Technology (AIT)

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Introduction
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Introduction

• Vclass Presentation Componet was developed by
  Distance Education Center (DEC) in Asian
  Institute of Technology.
• The objective of the component is to transform
  live lecture into electronic data to be able to
  access and play back later on demand.

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Vclass Presentation Component Concept
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Two Problems

• The objective of Vclass Presentation Component is
  to transform live lecture into electronic data to
  be able to access and play back later on demand.
• How to represent live lecture scenario by
  electronic data?
• How to interpret that data and to re-produce the
  lecture scenario for on demand environment?

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Lecture Scenario

• The lecture scenario that Vclass Presentation
  Component tries to capture consists of three
  objects.
• Instructor, Slides Presentation, and Pointer
• In the scenario, while instructor is speaking,
  the slide presentation shows the page related to
  the topic.
• Moreover, the pointer is spotted on the slide to
  show the exact location of information that the
  instructor is saying.

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Representing the Objects

• Vclass Presentation Component represents the
  objects in lecture scenario by basic multimedia
  elements as follow.

Instructor A Video or Audio
Slides One picture for each slide.
Pointer An arrow picture.
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Representing Temporal Relation (1)

• How to represent temporal relations among Video,
  Slides and Pointer coordinates in this scenario?

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Representing Temporal Relation (1)
000000no action!
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Representing Temporal Relation (1)
000200slide(1)point(x1,y1)!
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Representing Temporal Relation (1)
000230slide(1)point(x2,y2)!
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Representing Temporal Relation (1)
000300slide(2)point(x3,y3)!
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Representing Temporal Relation (1)
000340slide(2)point(x4,y4)!
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Representing Temporal Relation (1)
000410slide(3)point(x5,y5)!
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Representing Temporal Relation (1)
000510slide(4)point(x6,y6)!
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Representing Temporal Relation (1)
000550slide(4)point(x7,y7)!
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Representing Temporal Relation (1)
000700no action!
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Representing Temporal Relation (2)

• An example of events file (temporal
  specification).
• 000000no action!
• 000200slide(1)point(x1,y1)!
• 000230slide(1)point(x2,y2)!
• 000300slide(2)point(x3,y3)!
• 000340slide(2)point(x4,y4)!
• 000410slide(3)point(x5,y5)!
• 000510slide(4)point(x6,y6)!
• 000550slide(4)point(x7,y7)!
• 000700no action!

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Synchronization Engine

• Synchronization engine interprets events file
  then controls slides and pointer coordination as
  follow the specification inside.
• Synchronization engine also handles pause,
  resume, seek forward and backward operations in
  addition to normal playback.

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Synchronization Algorithm
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Synchronization Algorithm
Playback Position
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Synchronization Algorithm
Playback Position
Current Block
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Normal Playback
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Normal Playback
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Normal Playback
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Normal Playback
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Normal Playback
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Seek Forward
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Seek Forward
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Seek Forward
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Seek Forward
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Seek Forward
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Seek Forward
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Seek Backward
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Seek Backward
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Seek Backward
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Seek Backward
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Seek Backward
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Seek Backward
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Other Operations

• Pause/Resume
• do nothing
• Stop
• seek backward to the beginning and pause

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Vclass Presentation Architecture
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Runtime Objects

• There are four important objects exist at run
  time.
• Video/Audio Player object
• Play the video or audio according to the assigned
  file location
• Timer object
• Iteratively activate Sync Engine every specified
  time interval
• Sync Engine object
• Load and interpret temporal specification,
  synchronize the slides and pointer with playback
  time position from Video Player
• Document object
• Render slide and pointer on the screen as follow
  the order from Sync Engine

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Runtime Objects Collaboration
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Main Process
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Objects Deployment
Right Frame
Left Frame
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Objects Deployment
Video object
Document object
Video control object
Timer object
Sync engine object
Right Frame
Left Frame
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Authoring Process
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Main Activities

• Transforming live lecture into electronic data is
  not an automatic job. The following are main
  activities to be done manually.
• Video Recording the Lecture
• Preparing Multimedia Resources
• Making an Events File (temporal specification)
• Deployment

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Video Recording the Lecture

• Use one or two cameras
• Focus 1st camera on the instructor
• Focus 2nd camera on the slide presentation
  (optional)
• The video in the 1st camera will used for
  displaying and synchronizing with slides and
  pointer.
• The video in the 2nd camera will be used
  internally as a reference when making events file
  later after the lecture.

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Preparing Multimedia Resources

• Transform analog video in the 1st camera to
  digital and save in a file (this requires a video
  capture card.)
• Take presentation file (generally PowerPoint
  file) from the instructor and save each page as a
  graphic file.

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Making an Events File

• Use the Vclass Presentation Authoring Tool
• Open video file
• Play the video
• Open slide and mark pointer position by using the
  video in 2nd camera as a reference.

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020000slide(1)point(100,150, right arrow)
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Deployment

• There are several options to deploy the lecture
• Make a CD and distribute to students
• Put on Web Server and Video Server
• Put the lecture on Vclass LMS

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Deployment (1)
Put in CDs
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Deployment (2)
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Deployment (3)
Vclass Server
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Integrating with Vclass Learning Management
System
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Whats Vclass LMS?

• Vclass LMS was developed for managing students
  and lectures that was produced by Vclass
  Presentation Component.

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Vclass LMS Functions

• The following are major learning management
  functions that the system provide.
• Course information structure management
• Student learning statistic tracking
• Student registration and course enrollment
• User profiles and accounts management
• Communications
• Provide course structure browsing and accessing
  to pre-captured lectures.

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Vclass Data Model (1)
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Vclass Data Model (2)
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New Version of Vclass LMS

• More functions
• Open source
• Free distribution
• Beta version end of March

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Benefit from Integrating with Vclass LMS

• The presentation component can work alone
  offline.
• But, to provide more classroom like environment
  to the student, the Vclass system is needed.

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Dependency of Components
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Thank you.

• For more information
• URL http//www.dec.ait.ac.th
• E-mail chaiwarat_at_ait.ac.th