Method, computer readable medium and apparatus for converting color image resolution

A method for converting color image resolution comprising:

• inputting an image enlarging ratio;
• inputting target pixel data of an image in a first color space to be enlarged in a sequence;
• sampling reference pixels including the target pixel and pixels at least one of which links to the target pixel;
• converting the reference pixel data into a second color space data;
• extracting image feature quantities from the reference pixel data;
• selecting one of a plurality of pixel multiplying methods according to the extracted image feature quantities;
• multiplying the target pixel by the selected image multiplying method with an integer value based on the input image enlarging ratio;
• outputting pixel data that have been generated by the target pixel multiplying step in a sequence;
• determining a multiplier being an integer value and a correction factor of which product is substantially identical with the input image enlarging ratio;
• and
• adjusting a number of pixels, which are generated in the pixel multiplying step, by at least one of inserting pixels and deleting pixels based on the correction factor.

A color image resolution converting apparatus comprising:

• an enlarging ratio input device configured to input an image enlarging ratio;
• an image data input device configured to input target pixel data of an image in a first color space to be enlarged in a sequence;
• a pixel sampling device configured to sample reference pixels including the target pixel and pixels at least one of which links to the target pixel;
• a color space converting device configured to convert the reference pixel data into a second color space data;
• a feature quantity extracting device configured to extract image feature quantities from the reference pixel data;
• a plurality of pixel multiplying devices each of which configured to generate pixels by multiplying the target pixel with an integer value based on the input image enlarging ratio in different manners respectively;
• a multiplying device selecting device configured to select one of outputs of the plurality of pixel multiplying devices according to the extracted image feature quantities;
• and
• an image data output device configured to output the selected pixels, wherein
• the plurality of pixel multiplying devices comprise at least two of a uniform pixel multiplying device, a linear interpolation device, a patterned pixel embedding device, and a multiple patterned pixel embedding device.

A color image resolution converting apparatus comprising:

• an enlarging ratio input device configured to input an image enlarging ratio;
• an image data input device configured to input target pixel data of an image in a first color space to be enlarged in a sequence;
• a pixel sampling device configured to sample reference pixels including the target pixel and pixels at least one of which links to the target pixel;
• a color space converting device configured to convert the reference pixel data into a second color space data;
• a feature quantity extracting device configured to extract image feature quantities from the reference pixel data;
• a plurality of pixel multiplying devices each of which configured to generate pixels by multiplying the target pixel with an integer value based on the input image enlarging ratio in different manners respectively;
• a multiplying device selecting device configured to select one of outputs of the plurality of pixel multiplying devices according to the extracted image feature quantities;
• an image data output device configured to output the selected pixels;
• an enlarging ratio divider configured to determine a multiplier being an integer value and a correction factor of which product is substantially identical with the input image enlarging ratio;
• and
• a correction enlarging device configured to adjust a number of pixels, which are generated by the pixel multiplying devices, by at least one of inserting pixels and deleting pixels based on the correction factor.