ICFHR2018 Competition on Vietnamese Online Handwritten Text Recognition Database (HANDS-VNOnDB2018)

Keywords

Vietnamese, Online Handwriting Database, ICFHR, recognition, competition

Description

HANDS-VNOnDB2018 (VNOnDB2018 in short [1]) is used for ICFHR2018 Competition on Vietnamese Online Handwritten Text Recognition using VNOnDB. It provides 1,146 Vietnamese paragraphs of handwritten text composed of 7,296 lines, more than 480,000 strokes and more that 380,000 characters written by 200 Vietnamese.

Writers were asked to write freely ground-truth text from a corpus of Vietnamese text. Our ground-truth text is derived from the VieTreeBank corpus which contains all of Vietnamese characters and some special symbols since it bases on Vietnamese newspapers. For collecting patterns, we used Fujistu PC Tablets (FMVT8170) with stylus pen at high sampling rate (120Hz). Each sequence contains multiple lines within various delayed strokes. VNOnDB2018 is available for research purpose only. For commercial purposes and sell products, please contact us via email.

Technical Details

The following is the structure of each InkML file in VNOnDB2018. There are two main sections: description section (including description, content_category, language, writer index, gender, age, ...) and trajectory data section (including multiple "traceGroup" elements). Each "traceGroup" element contains a groundtruth text in "Tg_Truth" tag and some strokes data in "trace" elements which are represented by x and y-coordinates of points.

<ink>
  <annotationXML>
    <Description>Cursive online handwriting</Description>
    <Content_Category>Text</Content_Category>
    <Language>Vietnamese</Language>
    <Writer_ID>id_xxxx</Writer_ID>
    <Gender>Male</Gender>
    <Age>22</Age>
    <Dominant_Hand>Left</Dominant_Hand>
    <Writing_Hand>Left</Writing_Hand>
    <Job>Student</Job>
    <Native_Language>Vietnamese</Native_Language>
    <Start_Time>2014-06-03T16:26:20</Start_Time>
    <DevName>FujitsuTabletPC</DevName>
    <SamplingRate>120</SamplingRate>
    <MaxNormalPressure>255</MaxNormalPressure>
    <Gt_File_Name>BCCTC</Gt_File_Name>
  </annotationXML>
  <traceGroup id="tg_0_0_0">
    <annotationXML>
      <Tg_Truth>Bản</Tg_Truth>
    </annotationXML>
    <trace id="tr_0_0"> x1 y1, x2 y2, x3 y3, ....</trace>
    <trace id="tr_0_1"> x11 y11, x12 y12, x13 y13, ....</trace>
  </traceGroup>
  ...
</ink>