Patent ID: 11935275
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 3:
4. The image processing method according to claim 2, wherein
the extracting includes performing a first extraction process,
the first extraction process includes:
obtaining a first hue histogram and a second hue histogram, the first hue histogram being a result of generating a hue histogram of the first region, the second hue histogram being a result of generating a hue histogram of the second region;
calculating a differential hue histogram by subtracting the second hue histogram from the first hue histogram in each bin of corresponding hue;
determining, as a current hue histogram, the differential hue histogram calculated;
performing a color range determination process for determining the first color range using the current hue histogram determined; and
extracting, as the plurality of first current pixels, a plurality of pixels each having a pixel value included in the first color range determined, and

the color range determination process includes:
selecting a predetermined number of bins in descending order of frequency from among a plurality of bins remaining after excluding one or more specific bins determined as having the specific color from a plurality of bins included in the current hue histogram; and
determining, as the first color range, a hue range specified by the predetermined number of bins selected and the one or more specific bins.