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HANd : A New Transcoding Technique for PDA Browsers Enrique Costa Montenegro Departamento de Ingeniería Telemática ETSI Telecomunicación Universidad de.

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Presentation on theme: "HANd : A New Transcoding Technique for PDA Browsers Enrique Costa Montenegro Departamento de Ingeniería Telemática ETSI Telecomunicación Universidad de."— Presentation transcript:

1 HANd : A New Transcoding Technique for PDA Browsers Enrique Costa Montenegro Departamento de Ingeniería Telemática ETSI Telecomunicación Universidad de Vigo, Spain

2 HANd: Hierarchical Atomic Navigation New transcoding technique for WWW navigation on PDA Keeps all original information One navigator page and several atomic pages Replaces unreadable elements by icons Introduction

3 Fragmentation of original page into zones Zones are sets of elements (pictures, links, text, tables...) Only one zone is displayed at original scale Navigator page: a reduced overview of the original page, with links to atomic pages Atomic pages: readable elements or zones, pieces of the original page HANd philosophy

4 Representations of elements –Reduced version: if readable –Representative icon: if reduced element or zone is unreadable Dependence between elements: an element is unreadable if all its descendants are unreadable Navigation page: representatives in the same relative locations of original elements HANd philosophy (II)

5 HANd example

6 HANd example (II)

7 HANd example (III)

8 HANd example (IV)

9 HANd example (V)

10 HANd page generator Two stages –Preprocessing stage –Conversion stage

11 HANd Page Generator (II) Preprocessing stage –Input: HTML documents –Conversion of HTML to XHTML using Jtidy –Obtain DOM tree from XHTML using a DOM parser –DOM tree: representation of XHTML document as a tree of nodes, each node is an element of the XHTML document

12 HANd Page Generator (III) Conversion stage –Input: DOM Tree –Apply visibility and transformation rules to DOM Tree –Obtain new DOM trees –Convert new DOM trees to navigation page and associated atomic pages

13 Transformation rules: readability A PDA-to-PC screen area ratio is calculated, R<1, used to reduce elements Text: new font area is calculated, move to atomic page if not readable Images: new size is calculated, if original picture is small enough, it wont be resized Readability threshold, label unreadable elements with 1, 0 otherwise

14 Transformation rules: pruning Labels are propagated across the DOM tree Branches without 0 labels are pruned

15 Transformation rules: results Nodes with label 0 (readable) are substituted with reduced representatives Nodes with label 1 (unreadable) are replaced by an icon, with a link to the atomic page with the original information Adjacency rule: all adjacent icons associated to elements of the same type are represented by a single icon

16 Transformation rules: example

17 Conclusions HANd: New Transcoding Technique for PDA Advantages –No information loss: all elements in atomic pages –Navigator page: readable overview of the original page –Valid for all WWW documents and navigators

18 Questions!! Example: What is the ´d´ in HANd?

19 The End


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