Imaging device, endoscope, and endoscope system

An imaging device for capturing an image of a subject irradiated with white light including a red wavelength band, a green wavelength band, and a blue wavelength band, or with narrow band light of a narrow band narrower than a wavelength band of the white light, and generating image data, the imaging device comprising:

• plural pixels arranged in a two-dimensional matrix, and configured to receive light from outside, generate imaging signals according to amounts of the received light, and output the imaging signal via one of vertical lines, the plural pixels having a horizontal two-shared pixel configuration for outputting the imaging signal by sharing one vertical line between horizontally neighboring two pixels;
• a color filter comprising:
• a blue filter having spectral characteristics where a maximum value of its transmission spectrum is in the blue wavelength band and transmittance of the wavelength band of a narrow band light is higher than the transmission spectrum in the red and green wavelength bands;
• a red filter having spectral characteristics where a maximum value of its transmission spectrum is in the red wavelength band and a minimum value of its transmission spectrum is near the maximum value of the transmission spectrum of the blue wavelength band, and having spectral characteristics where its transmission spectrum gradually increases toward a short wavelength side from 440 nm;
• and
• a green filter having spectral characteristics where a maximum value of its transmission spectrum is in the green wavelength band and a minimum value of its transmission spectrum is near the maximum value of the transmission spectrum of the blue wavelength band, and having spectral characteristics where its transmission spectrum gradually increases toward a short wavelength side from 440 nm,
• wherein the blue filter, the red filter, and the green filter are respectively arranged correspondingly to the plural pixels;
• and
• a controller configured to execute control of making an accumulation time of a pixel of the plural pixels shorter than accumulation times of pixels having other filters arranged thereon, the pixel having highest spectral sensitivity to the narrow band light.