Signal processing device, signal processing method, image capture device, and medical image capture device

Abstract

To enable tunable wavelength extraction and detection of a narrow band, while maintaining resolution.Provided is a signal processing device including: an acquisition unit that acquires a signal of a first wavelength band in which wavelength extraction is possible in a tunable manner by means of postprocessing and a signal of a second wavelength band to be used for a special purpose; and a signal processing unit that performs signal processing using the signal of the first wavelength band and the signal of the second wavelength band.

1 . A signal processing device comprising:
 an acquisition circuitry configured to   tunably extract, with postprocessing, a first signal of a first wavelength band, and   extract a second signal of a second wavelength band to be used for a special purpose; and   a signal processing circuitry configured to perform signal processing based on at least one of the first signal or the second signal.   
     
     
         2 . The signal processing device according to  claim 1 ,
 wherein the signal processing circuitry is further configured to extract, with the first signal, a third signal of a desired wavelength band.   
     
     
         3 . The signal processing device according to  claim 2 ,
 wherein the signal processing circuitry is further configured to calculate a vegetation characteristic based on at least one of the second signal or the third signal.   
     
     
         4 . The signal processing device according to  claim 3 ,
 wherein the vegetation characteristic includes one of a normalized difference vegetation index (NDVI), a green normalized difference vegetation index (GNDVI), a photochemical reflectance index (PRI), or a sun-induced fluorescence (SIF).   
     
     
         5 . A signal processing method comprising:
 tunably extracting, with an electronic processor and postprocessing, a first signal of a first wavelength band;   acquiring, with the electronic processor, a second signal of a second wavelength band to be used for a special purpose; and   performing, with the electronic processor, signal processing based on at least one of the first signal or the second signal.   
     
     
         6 . An image capture device comprising:
 a first detection circuitry configured to detect a first signal of a first wavelength band; and   a second detection circuitry configured to detect a second signal of a second wavelength band to be used for a special purpose,   wherein, with postprocessing, tunable wavelength extraction is possible with respect to the first signal.   
     
     
         7 . The image capture device according to  claim 6 ,
 wherein the first detection circuitry is a first portion of pixels of an image sensor, and wherein the second detection circuitry is a second portion of the pixels of the image sensor.   
     
     
         8 . The image capture device according to  claim 7 ,
 wherein the first detection circuitry and the second detection circuitry include, on a pixel basis, filters having different spectral characteristics.   
     
     
         9 . The image capture device according to  claim 8 ,
 wherein transmittances of the filters provided in the first detection circuitry and the second detection circuitry are determined on a basis of output sensitivities of the first detection circuitry and the second detection circuitry, respectively.   
     
     
         10 . The image capture device according to  claim 8 ,
 wherein a number of the first portion of the pixels and a number of the second portion of the pixels are determined on a basis of output sensitivities of the first detection circuitry and the second detection circuitry, respectively.   
     
     
         11 . The image capture device according to  claim 8 , further comprising:
 an exposure control circuitry configured to control exposure on a basis of output sensitivity of each of the first detection circuitry and the second detection circuitry.   
     
     
         12 . The image capture device according to  claim 8 ,
 wherein a filter provided in the first detection circuitry is a plasmon resonance filter.   
     
     
         13 . The image capture device according to  claim 8 ,
 wherein a filter included in the second detection circuitry is a dual bandpass filter.   
     
     
         14 . The image capture device according to  claim 6 ,
 wherein the first detection circuitry and the second detection circuitry are provided in different cameras or image capture mechanisms.   
     
     
         15 . The image capture device according to  claim 14 , further comprising:
 a dichroic filter that separates light entering the first detection circuitry and the second detection circuitry.   
     
     
         16 . The image capture device according to  claim 6 ,
 wherein the first wavelength band is a wide band.   
     
     
         17 . The image capture device according to  claim 6 ,
 wherein the second wavelength band is one of a wide band or a narrow band.   
     
     
         18 . The image capture device according to  claim 6 , further comprising:
 a display control circuitry that displays a first image generated on a basis of the first signal so as to be overlaid on a second image generated on a basis of the second signal.   
     
     
         19 . A medical image capture device comprising:
 a first detection circuitry configured to detect a first signal of a first wavelength band; and   a second detection circuitry configured to detect a second signal of a second wavelength band to be used for a special purpose,   wherein, with postprocessing, tunable wavelength extraction is possible with respect to the first signal.   
     
     
         20 . The medical image capture device according to claim  19 , further comprising:
 a focusing circuitry configured to perform focusing based on the second signal.