Patent ID: 8400538

Claim:
An apparatus for capturing images, comprising: a filter unit having a plurality of filters having different wavelength bands; a sensor unit including a plurality of sensor cells corresponding to a plurality of pixels and sensing optical signals passing through the plurality of filters; and a signal-extraction unit capable of extracting at least one of detailed optical signals in respective wavelength bands including all of a red signal, a green signal, and a blue signal by using a difference between a combination of optical signals having passed through a first filter and sensed by an optical conversion layer, and at least one optical signal having passed through a second filter and sensed by the same optical conversion layer having sensed the combination of optical signals, wherein the sensor unit has a plurality of optical-signal-sensing layers stacked on one another, the optical-signal-sensing layers having different degrees of spectroscopic sensitivity and having different depths according to filter type, so as to sense optical signals corresponding to the optical-signal-sensing layers, respectively.