Image processing device, method of processing image, and image processing program including false color correction

A method of processing an image executed in an image processing device, the method comprising:

• by a data conversion processing unit, executing data conversion processing of having receiving an RGBW array image as an input image, and generating an RGB array image as an output image,
• in the data conversion processing unit, executing false color detection processing of detecting a false color pixel of the input image, and outputting detection information,
• low-band signal calculation processing of being-input receiving the detection information, and changing a processing aspect according to the detection information to calculate low-band signals corresponding to respective RGBW colors, and
• pixel interpolation processing of executing pixel conversion of the RGBW array of the input image to generate the RGB array image by pixel interpolation to which the low-band signals are applied,
• wherein in the pixel interpolation processing, calculating an interpolation pixel value based on an assumption that a low-band signal mW of a W pixel and low-band signals mR, mG, and mB of respective RGB pixels have a proportional relation in a local region and
• wherein, based on receiving the detection information that a pixel of interest is the false color pixel from the false color detection unit, the low-band signal calculation unit applies a low-pass filter to which a low-pass filter coefficient in which a pixel value contribution rate of a pixel near the pixel of interest is made relatively lower than that of a pixel separated from the pixel of interest is set to calculate the low-band signals.

A computer-readable storage device encoded with computer-executable instructions that, when executed by a processing device, perform an image processing method comprising:

• causing a data conversion processing unit to execute a data conversion processing step of receiving an RGBW array image as an input image, and generating an RGB array image as an output image,
• in the data conversion processing step, causing the data conversion processing unit to execute false color detection processing of detecting a false color pixel of the input image, and outputting detection information,
• low-band signal calculation processing of receiving the detection information, and changing a processing aspect according to the detection information to calculate low-band signals corresponding to respective RGBW colors, and
• pixel interpolation processing of executing pixel conversion of the RGBW array of the input image to generate the RGB array image by pixel interpolation to which the low-band signals are applied,
• wherein in the pixel interpolation processing, calculating an interpolation pixel value based on an assumption that a low-band signal mW of a W pixel and low-band signals mR, mG, and mB of respective RGB pixels have a proportional relation in a local region and
• wherein, based on receiving the detection information that a pixel of interest is the false color pixel from the false color detection unit, the low-band signal calculation unit applies a low-pass filter to which a low-pass filter coefficient in which a pixel value contribution rate of a pixel near the pixel of interest is made relatively lower than that of a pixel separated from the pixel of interest is set to calculate the low-band signals.