Patent ID: 8593631
Filing Date: 2013-11-26
Classification: G01J,G02B

Abstract:
1. A spectral image acquiring apparatus comprising: an optical filter on which light from an imaged area is incident; an image sensor including a two-dimensionally disposed pixel array and configured to detect the light via the optical filter and configured to output a detection signal; and a signal processing unit configured to process the detection signal from the image sensor and generate a digital signal indicating a luminance of each of pixels on the image sensor, and configured to generate a difference-value image based on the detection signal obtained from a single imaging operation, wherein the optical filter includes a diffraction grating having a lattice pattern corresponding to unit areas on the image sensor, the unit areas including one or more pixels on the image sensor, wherein the lattice pattern of the diffraction grating includes an alternate arrangement of a light-blocking area and a light-transmitting area, wherein the signal processing unit calculates a difference value in an amount of received light between two of the unit areas on the image sensor that are adjacent to each other based on the luminance of the each of the pixels on the image sensor, and generates the difference-value image based on the calculated difference value, and wherein the difference value between the two adjacent unit areas on the image sensor is varied based on a difference in an interference point on the image sensor corresponding to a diffraction angle of the light that has passed through the diffraction grating.