Image processing apparatus and image pickup apparatus

An image processing apparatus, comprising:

• a signal processing section configured to:
• receive a raw image from an image pickup device of a multispectral camera, wherein
• the raw image is based on band light in a specific band transmitted by each of a multi-band pass filter and a plurality of color filter elements of the multispectral camera, and
• the band light is transmitted by the plurality of color filter elements to each of a plurality of pixels of the image pickup device;
• generate a plurality of raw image base pixel values based on the raw image;
• and
• generate a true pixel value, corresponding to the specific band, of each of the plurality of pixels based on the generated plurality of raw image base pixel values and a spectral characteristic parameter of the multispectral camera, wherein
• the spectral characteristic parameter of the multispectral camera is an intensity ratio of a signal transmitted by a first color filter element of the plurality of color filter elements to a signal transmitted by a second color filter element of the plurality of color filter elements in the specific band of the multi-band pass filter.

An image processing method executed by an image pickup apparatus, the image processing method comprising:

• selectively transmitting, by a multi-band pass filter of the image pickup apparatus, band light in a specific band, wherein the band light corresponds to a plurality of color filter elements of a color filter of the image pickup apparatus;
• transmitting, by the color filter, the band light in the specific band to each of a plurality of pixels of an image pickup device of the image pickup apparatus;
• receiving, by the image pickup device, the band light transmitted by the multi-band pass filter and the color filter;
• generating, by the image pickup device, a raw image based on the received band light;
• generating, by a signal processing section of the image pickup apparatus, a plurality of raw image base pixel values based on the raw image from the image pickup device;
• and
• generating, by the signal processing section, a true pixel value, corresponding to the specific band, of each of the plurality of pixels based on the generated plurality of raw image base pixel values and a spectral characteristic parameter of the image pickup apparatus, wherein
• the spectral characteristic parameter of the image pickup apparatus is an intensity ratio of a signal transmitted by a first color filter element of the plurality of color filter elements to a signal transmitted by a second color filter element of the plurality of color filter elements in the specific band of the multi-band pass filter.

An image processing method executed by an image processing apparatus, the image processing method comprising:

• receiving a raw image from an image pickup device of a multispectral camera, wherein
• the raw image is based on band light in a specific band transmitted by each of a multi-band pass filter and a plurality of color filter elements of the multispectral camera, and
• the band light is transmitted by the plurality of color filter elements to each of a plurality of pixels of the image pickup device;
• generating a plurality of raw image base pixel values based on the raw image;
• and
• generating a true pixel value, corresponding to the specific band, of each of the plurality of pixels based on the generated plurality of raw image base pixel values and a spectral characteristic parameter of the multispectral camera, wherein
• the spectral characteristic parameter of the multispectral camera is an intensity ratio of a signal transmitted by a first color filter element of the plurality of color filter elements to a signal transmitted by a second color filter element of the plurality of color filter elements in the specific band of the multi-band pass filter.

A non-transitory computer-readable medium having stored thereon, computer-executable instructions which, when executed by an image processing apparatus, cause the image processing apparatus to execute operations, the operations comprising:

• receiving a raw image from an image pickup device of a multispectral camera, wherein
• the raw image is based on band light in a specific band transmitted by each of a multi-band pass filter and a plurality of color filter elements of the multispectral camera, and
• the band light is transmitted by the plurality of color filter elements to each of a plurality of pixels of the image pickup device;
• generating a plurality of raw image base pixel values based on the raw image;
• and
• generating a true pixel value, corresponding to the specific band, of each of the plurality of pixels based on the generated plurality of raw image base pixel values and a spectral characteristic parameter of the multispectral camera, wherein
• the spectral characteristic parameter of the multispectral camera is an intensity ratio of a signal transmitted by a first color filter element of the plurality of color filter elements to a signal transmitted by a second color filter element of the plurality of color filter elements in the specific band of the multi-band pass filter.