Detection of printed codes with a camera phone

Liisa Hakola, Hannu Linna

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review


    The scope of a research project at VTT Information Technology was to investigate new printed coding methods such as two-dimensional bar codes and their applications. It was found that the camera phones are suitable for detecting even very small printed two-dimensional bar codes, but add-on lenses are needed. It is, however, expected that camera phones will have higher resolution and better lenses in a few years time which will result in detecting smaller cells and more characters in one symbol. Camera phones can also be used for detecting colours for purposes such as food quality indication, but for reliable detection better CCD cells or colour calibration is needed.
    Original languageEnglish
    Title of host publicationDigitalisation and Print Media
    Subtitle of host publication32nd International iagirai Research Conference. Conference Papers.
    PublisherVTT Technical Research Centre of Finland
    ISBN (Electronic)951–38–5535–X
    ISBN (Print)951-38-5534-1
    Publication statusPublished - 2005
    MoE publication typeA4 Article in a conference publication
    Event32nd International Research Conference of IARIGAI - Porvoo, Finland
    Duration: 4 Sept 20057 Sept 2005


    Conference32nd International Research Conference of IARIGAI


    • printed code
    • two-dimensional bar code
    • camera phone
    • food quality indicator


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