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Embedded interaction code decoding for a liquid crystal display

  • US 7,528,848 B2
  • Filed: 06/30/2005
  • Issued: 05/05/2009
  • Est. Priority Date: 06/30/2005
  • Status: Expired due to Fees
First Claim
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1. A method for decoding an embedded interaction code (EIC) pattern on a liquid crystal display (LCD), the method comprising steps of:

  • receiving a captured image;

    processing the captured image to output an extracted bit stream; and

    decoding position data from the extracted bit stream;

    determining a position of the captured image with respect to a screen of the LCD based upon the decoded position data;

    wherein the step of processing includes steps of,preprocessing the captured image to determine pixels corresponding to LCD pixel grids associated with the EIC pattern;

    defining the LCD pixel grids based upon the pixels;

    recognizing the EIC pattern from the LCD pixel grids;

    extracting a bit stream of EIC bits based upon the recognized EIC pattern to obtain the extracted bit stream;

    wherein the step of preprocessing includes steps of,separating pixels that lie on edges and vertexes of the LCD pixel grids as a first mask;

    binary eroding the first mask to obtain a second mask, the second mask including fewer pixels than the first mask;

    separating connected regions of the second mask in accordance with a first threshold to obtain a third mask and a fourth mask;

    binary eroding the fourth mask to obtain a fifth mask;

    defining a second threshold corresponding to a region of the fifth mask;

    defining a sixth mask as pixels that belong to the regions of the fifth mask; and

    merging the third and the sixth masks to define the LCD pixel grids.

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