Label detection
AssigneeHoneywell International Inc.
InventorsLokesh R. Boregowda, Anupama Rajagopal, Krishnamoorthy Dornadula, Lalitha M. Eswara
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Abstract
A system and a method to detect a label are described herein. The system and method are to extract a horizontal region of interest based on the image; to extract a vertical region of interest based on the image; and to identify presence of the primary label in the image from the horizontal region of interest and from the vertical region of interest.
Claims21
A method to detect an identification label comprising:
- using a processor for
- determining an input image having an identification label;
- processing the input image;
- determining a column difference image;
- determining a row projection histogram of the column difference image associated with the identification label;
- processing a row projected image to extract a horizontal region associated with the identification label;
- extracting a vertical region of interest associated with the identification label, wherein an index of a largest cluster present is used to extract the vertical region;
- determining vertical wavelet coefficients using a wavelet transform and clustering the vertical wavelet coefficients;
- wherein the extracting the horizontal region of interest is selected from a group including:
- determining a column projection histogram of a row difference image associated with the identification label and processing a column projected image;
- and
- using wavelet coefficient clustering of the row difference image.
A method to identify presence of a primary label in an image comprising:
- using a processor for
- extracting a vertical region of interest based on the image using projection histogram analysis and an index of a largest cluster present;
- extracting a horizontal region of interest based on the image using projection histogram analysis;
- determining vertical wavelet coefficients using a wavelet transform and clustering the vertical wavelet coefficients;
- and
- identifying presence of the primary label in the image from the horizontal region of interest and from the vertical region of interest.
A tangible machine-readable storage medium storing a sequence of instructions that, when executed by a computer, cause the computer to perform a method of identifying presence of a primary label in an image, the method comprising:
- extracting a vertical region of interest based on an image using projection histogram analysis and an index of a largest cluster present;
- extracting a horizontal region of interest based on the image using projection histogram analysis;
- determining vertical wavelet coefficients using a wavelet transform and clustering the vertical wavelet coefficients;
- and
- identifying presence of a primary label in the image from the horizontal region of interest and from the vertical region of interest.
A method comprising:
- using a processor for
- detecting a vehicle in an image;
- extracting a vertical region of interest based on the image using projection histogram analysis and an index of a largest cluster present;
- determining vertical wavelet coefficients using a wavelet transform and clustering the vertical wavelet coefficients;
- detecting a license plate of the vehicle using the projection histogram analysis on a gradient image;
- segmenting characters of the plate;
- and
- recognizing the characters.
A system to identify a label in an image comprising:
- means for extracting a vertical region of interest based on the image using projection histogram analysis and an index of a largest cluster present;
- means for extracting a horizontal region of interest based on the image using projection histogram analysis;
- means for determining vertical wavelet coefficients using a wavelet transform and clustering the vertical wavelet coefficients;
- and
- means for identifying presence of the label in the image from the horizontal region of interest and from the vertical region of interest.
Dependencies are inferred from the claim text.