Patent ID: 8446499
Filing Date: 2013-05-21
Classification: H04N

Abstract:
1. An image capturing apparatus comprising: an infrared cutoff filter; an image capturing device having a plurality of pixels for detecting light transmitted through the infrared cutoff filter; four optical filters disposed on a light-detecting surface of the image capturing device, the four optical filters having different filter characteristics; and a processor for processing pixel signals generated by the pixels of the image capturing device; wherein the four optical filters include a first filter for transmitting light having a wavelength longer than a first wavelength, a second filter for transmitting light having a wavelength longer than a second wavelength, a third filter for transmitting light having a wavelength longer than a third wavelength, and a fourth filter for transmitting light having a wavelength longer than a fourth wavelength; and the infrared cutoff filter transmits light having a wavelength shorter than a fifth wavelength; the processor comprises: a blue-component calculator for calculating a blue-component pixel signal by subtracting a pixel signal output from the pixel that detects light transmitted through the first filter from a pixel signal output from the pixel that detects light applied to the infrared cutoff filter; a green-component calculator for calculating a green-component pixel signal by subtracting a pixel signal output from the pixel that detects light transmitted through the second filter from the pixel signal output from the pixel that detects light transmitted through the first filter; and a red-component calculator for calculating a red-component pixel signal by subtracting a pixel signal output from the pixel that detects light transmitted through the third filter from the pixel signal output from the pixel that detects light transmitted through the second filter; wherein the first wavelength, the second wavelength, the third wavelength, the fourth wavelength, and the fifth wavelength are related to each other such that the first wavelength<the second wavelength<the third wavelength<the fourth wavelength<the fifth wavelength.