It is designed to provide a kind of downsized image processing unit, imaging device, image procossing and program. Image processing unit 3 includes: that determination unit 32 determines whether that the photographing element 22 of image data is generated greater than threshold value by the environment of light quantity black light wave band With generating unit 34, it determines that light quantity black light wave band is equal to or more than threshold value in the determination unit 32, the patient for generating life-information is corresponded on the position of that pixel using the pixel value that the position that pixel value corresponds to that pixel is equipped with third narrow band filter image to be arranged in the second narrow band filter, when determination unit 32 determines that light quantity black light wave band is not equal to or no more than threshold value, the position that the object for then generating life-information is equipped with the pixel value of the first narrow band filter image using the position that pixel value corresponds to that pixel and one corresponds to pixel is disposed in wherein in the second narrow band filter.
