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

摘要

There are provided a device and method that correct a false color occurring in a locally highlighted region in an image. A false color pixel is detected in data conversion processing of generating an RGB array image from an RGBW array image, low-band signals corresponding to respective RGBW colors that are different according to whether a pixel is a false color pixel, and the RGBW array is converted by interpolation processing to which the calculated low-band signals are applied to generate the RGB array image. The interpolation processing is performed using the low-band signals on an assumption that a W low-band signal mW, and RGB respective low-band signals mR, mG, and mB have a proportional relation in a local region. When a pixel of interest is a false color pixel, the low-band signal is calculated by an application of a low-pass filter having a coefficient in which a contribute rate of pixel values in the vicinity of the pixel of interest is made relatively lower than that of separated pixels.

主权项

1. An image processing device comprising:
a data conversion processing unit configured to receive an RGBW array image as an input image, and to generate an RGB array image as an output image, the data conversion processing unit including:
a false color detection unit configured to detect a false color pixel in the input image, and to output detection information,a low-band signal calculation unit configured to receive the detection information from the false color detection unit, and to change a processing aspect according to the detection information to calculate low-band signals corresponding to respective RGBW colors, anda pixel interpolation unit configured to execute pixel conversion of the RGBW array of the input image, by pixel interpolation to which the low-band signals calculated by the low-band signal calculation unit are applied, to generate the RGB array image, wherein the pixel interpolation unit calculates an interpolation pixel value 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.