Imaging device and capsule endoscope system

An imaging device comprising:

• imaging means for performing a photoelectric conversion on light received by each of a plurality of pixels arranged in a two-dimensional pattern, to generate an electric signal;
• color filtering means for filtering light received by the plurality of pixels, the color filtering means including first filtering means, second filtering means, and third filtering means arranged in association with the plurality of pixels, the first filtering means being for transmitting light in a wavelength band of a primary color or a complementary color, the second filtering means being for transmitting narrowband light having a maximum value of a transmission spectrum outside a range of the wavelength band of the light that passes through the first filtering means, and the third filtering means being for transmitting narrowband light having a maximum value of a transmission spectrum outside the range of the wavelength band of the light that passes through the first filtering means and outside a wavelength band of the light that passes through the second filtering means;
• first light emitting means for emitting broadband light including a range of a transmission spectrum of the first filtering means;
• second light emitting means for emitting light having an upward projecting distribution of a wavelength spectrum in relation to intensity and having a narrowband light spectrum narrower than the broadband, the light being radiated such that an upper limit value and a lower limit value of a wavelength that are half a maximum value in the light spectrum are between an upper limit value and a lower limit value of a wavelength that are half the maximum value in the transmission spectrum of the second filtering means;
• third light emitting means for emitting light having an upward projecting distribution of a wavelength spectrum in relation to intensity and having a narrowband light spectrum narrower than the broadband, the light being radiated such that an upper limit value and a lower limit value of a wavelength that are half a maximum value in the light spectrum are between an upper limit value and a lower limit value of a wavelength that are half the maximum value in the transmission spectrum of the third filtering means;
• and
• controlling means for controlling the first light emitting means, the second light emitting means, and the third light emitting means to radiate beams of light simultaneously,
• wherein a peak wavelength of the light emitted by the second light emitting means and a peak wavelength of the light radiated by the third light emitting means are any two of an infrared region, a near-infrared region, and 415 nm±30 nm.