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IMAGE PROCESSING METHOD AND APPARATUS USING TRAINED DICTIONARY

  • US 20150227819A1
  • Filed: 02/03/2015
  • Published: 08/13/2015
  • Est. Priority Date: 02/07/2014
  • Status: Active Grant
First Claim
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1. An image processing method of converting a first image into a second image, comprising:

  • providing multiple first dictionaries produced by dictionary learning and multiple second dictionaries corresponding to the first dictionaries;

    performing, on each of the multiple first dictionaries, a process to approximate the first image by linear combination of elements of the first dictionary so as to produce a linear combination coefficient and thereby acquiring multiple linear combination coefficients;

    calculating, for each of the multiple linear combination coefficients, a ratio between a largest coefficient element whose absolute value is largest among coefficient elements of the linear combination coefficient and a second-largest coefficient element whose absolute value is second-largest thereamong and selecting a specific linear combination coefficient in which the ratio is largest among the multiple linear combination coefficients;

    selecting, from the multiple second dictionaries, a specific dictionary corresponding to the first dictionary for which the specific linear combination coefficient is produced; and

    producing the second image by using linear combination of the specific linear combination coefficient and elements of the specific dictionary.

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