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Hardcopy image barcodes via block-error diffusion.

Niranjan Damera-Venkata1, Jonathan Yen, Vishal Monga

  • 1Imaging Systems Laboratory, HP Laboratories, Palo Alto, CA 94304-1126, USA. damera@exch.hpl.hp.com

IEEE Transactions on Image Processing : a Publication of the IEEE Signal Processing Society
|December 24, 2005
PubMed
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This study introduces block-error diffusion for creating custom FM halftones. This method enables embedding high-capacity information into printed images, creating an image barcode.

Area of Science:

  • Digital imaging and printing technologies.
  • Information embedding and data security.
  • Image processing and computer vision.

Background:

  • Error diffusion halftoning is widely used for frequency modulated (FM) halftones.
  • Conventional FM halftoning uses fixed dot sizes and variable dot frequencies.
  • Existing methods lack user control over dot size and shape.

Purpose of the Study:

  • To generalize error diffusion for FM halftones with user-controlled dot size and shape.
  • To apply block-error diffusion for embedding information in hardcopy via dot shape modulation.
  • To model the encoding-decoding process as robust data transmission through a noisy print-scan channel.

Main Methods:

  • Utilizing block quantization and block filtering to generalize error diffusion.

Related Experiment Videos

  • Implementing a modified block-error diffusion strategy for encoding and halftoning.
  • Modeling the print-scan channel to ensure robust data transmission and decoding.

    • Main Results:

    • Successful generalization of error diffusion to produce FM halftones with controllable dot characteristics.
    • Demonstration of information embedding in hardcopy using dot shape modulation, creating an 'image barcode'.
    • Analysis of encoder stability, image quality versus information capacity trade-offs, and decoding performance.

    Conclusions:

    • Block-error diffusion offers a novel approach for creating advanced FM halftones.
    • The proposed method enables high-capacity information embedding in printed images, functioning as an image barcode.
    • The technique provides a robust framework for secure data transmission through print-scan channels.