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Reinventing Printed Document Keeping digital as digital with uPen Jian Wang Senior Researcher Microsoft Research Asia July 19, 2005 Jian Wang Senior Researcher.

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Presentation on theme: "Reinventing Printed Document Keeping digital as digital with uPen Jian Wang Senior Researcher Microsoft Research Asia July 19, 2005 Jian Wang Senior Researcher."— Presentation transcript:

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2 Reinventing Printed Document Keeping digital as digital with uPen Jian Wang Senior Researcher Microsoft Research Asia July 19, 2005 Jian Wang Senior Researcher Microsoft Research Asia July 19, 2005

3 Outline Challenges and Approach Technologies Embedded Interaction Code(EIC) system Computer vision system HW/SW architecture Hardware prototype design EIC SDK: system design and APIs Demos Challenges and Approach Technologies Embedded Interaction Code(EIC) system Computer vision system HW/SW architecture Hardware prototype design EIC SDK: system design and APIs Demos

4 Challenges ``non-digital way of doing things'' like paper and pencils PCs still create non-digital document Such as printed document Keyboard/mouse confine people to desktop Mobile interaction device ``non-digital way of doing things'' like paper and pencils PCs still create non-digital document Such as printed document Keyboard/mouse confine people to desktop Mobile interaction device

5 Goal Digital original Keep digital as digital Makes every printed document digital Brings digital computing to places where things are still being done in non-digital ways Digital original Keep digital as digital Makes every printed document digital Brings digital computing to places where things are still being done in non-digital ways

6 Approach: EIC System High data-embedding capacity to provide a gigantic address space up to bits. A family of EIC visual patterns to adapt to various hardware implementations, applications and surfaces, and to meet the needs for usability and readability. Multiple data-embedding channels to embed x and y coordinates, and both global (such as document ID) and local metadata in a digital document. High data-embedding capacity to provide a gigantic address space up to bits. A family of EIC visual patterns to adapt to various hardware implementations, applications and surfaces, and to meet the needs for usability and readability. Multiple data-embedding channels to embed x and y coordinates, and both global (such as document ID) and local metadata in a digital document.

7 EIC Pattern EIC: Absolute X, Y Coordinates

8 A pseudo-random 1D array of 0 ’ s and 1 ’ s with “ window ” property An example with primitive polynomial of order 6: h(x)=x 6 +x+1, code length = =63 The window property ensures the unique decodability Window Property of m-sequence

9 0 m1 = 9 m2=7 Construction of m-array Create a 2D array with size of m1*m2, where gcd(m1,m2) =1 Folding the sequence The 2D array retains the window property. If L is the bit location in m- sequence, then its location in m-array: x= L mod m1 y= L mod m2 Create a 2D array with size of m1*m2, where gcd(m1,m2) =1 Folding the sequence The 2D array retains the window property. If L is the bit location in m- sequence, then its location in m-array: x= L mod m1 y= L mod m2

10 Data-embedding

11 EIC pattern Decodable area EIC + Encoded content Non- decodable area Bounding box Action Biding EIC with Document

12 Hardware Architecture Mechanical Size: 14x17x160mm Ink cartage Pressure sensor Optical Camera Lens IR LED Electrical Processor/Memory Bluetooth Battery Mechanical Size: 14x17x160mm Ink cartage Pressure sensor Optical Camera Lens IR LED Electrical Processor/Memory Bluetooth Battery

13 Computer Vision System To obtain high resolution (> 400 dpi), accurate x and y positions and metadata on printed digital documents (papers). To obtain actual x and y position of the pen tip regardless of pen posture (tilting and rotating). Calibration error < 0.15mm. To obtain sufficient spatial and temporal resolution (> 400 dpi x 120 Hz) of uPen digital ink (so that it’s compatible with the resolution of Tablet PC ink). To obtain high resolution (> 400 dpi), accurate x and y positions and metadata on printed digital documents (papers). To obtain actual x and y position of the pen tip regardless of pen posture (tilting and rotating). Calibration error < 0.15mm. To obtain sufficient spatial and temporal resolution (> 400 dpi x 120 Hz) of uPen digital ink (so that it’s compatible with the resolution of Tablet PC ink).

14 Document/EIC pattern segmentation T : document content A: EIC pattern Z : background area adaptive threshold of EIC pattern at (i, j) adaptive threshold of document content at (i, j)

15                    nYXSW nYXSB kl i il j jk klji kl i il j jk klji /)),max(( /)),min((, ,,, ,, EIC Pattern Processing  kkkkk ijj n i kkkiik YXXXb bxyjSibxyJ k k k kk ' 1 ' 1 2 }|||{,)( 1        Bits in camera FOV: 98.5bits in average Extracted bits: 93% in average Determine EIC pattern grid Determine orientation of pattern Determine the value of each bits

16 Efficient Image Matching :search radius. :Maximum grid alignment error. : transformation matrix from camera coordinate to document image coordinate

17 EIC SDK Architecture uPen prototype/third-party hardware Applications EIC Embedded SDK EIC SDK uPen Firmware EIC Pattern Metadata EIC Document.Net Compact Framework

18 Demos

19 Thank you


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