Hand a new transcoding technique for pda browsers
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HANd : A New Transcoding Technique for PDA Browsers. Enrique Costa Montenegro Departamento de Ingeniería Telemática ETSI Telecomunicación Universidad de Vigo, Spain [email protected] Introduction. HANd: Hierarchical Atomic Navigation New transcoding technique for WWW navigation on PDA

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HANd : A New Transcoding Technique for PDA Browsers

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Hand a new transcoding technique for pda browsers

HANd:A New Transcoding Technique for PDA Browsers

Enrique Costa Montenegro

Departamento de Ingeniería Telemática

ETSI Telecomunicación

Universidad de Vigo, Spain

[email protected]


Introduction

Introduction

  • 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


Hand philosophy

HANd philosophy

  • 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 ii

HANd philosophy (II)

  • 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 example

HANd example


Hand example ii

HANd example (II)


Hand example iii

HANd example (III)


Hand example iv

HANd example (IV)


Hand example v

HANd example (V)


Hand page generator

HANd page generator

  • Two stages

    • Preprocessing stage

    • Conversion stage


Hand page generator ii

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


Hand page generator iii

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


Transformation rules readability

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


Transformation rules pruning

Transformation rules: pruning

  • Labels are propagated across the DOM tree

  • Branches without 0 labels are pruned


Transformation rules results

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


Transformation rules example

Transformation rules: example


Conclusions

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


Questions

Questions!!

Example:

What is the ´d´ in HANd?


The end

The End


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