Abstract: An information processing device including a calculation unit that calculates an evaluation function using a visibility threshold of a test subject obtained by performing a visual acuity examination on the test subject and using a parameter related to a visual object, and a spectral transmittance optimization unit that optimizes a spectral transmittance of a filter having a spectral transmittance to light from the visual object using the evaluation function when passed through the filter.

Abstract: There is provided an image output device 10 that includes: a detection unit 101 that detects, as a start trigger for color change processing, acquisition of color change information that is to be used for the color change processing and that is unique to a user who is a target of the color change processing related to color change of visual information to be presented to the user; a color change processing unit 104 that performs, in response to detection of the start trigger by the detection unit 101, the color change processing based on the color change information; and a visual information output unit 105 that outputs, in a format corresponding to a situation of the user, the visual information after color change by the color change processing unit 104.

Abstract: An analysis unit determines at least two boundaries by determining; in a coordinate system indicating a correlation between a luminance contrast value between a luminance of an attention portion and a luminance of a background portion, and a luminance average value of a visual target including the attention portion and the background portion; the boundary between a region where a subject has a visibility and a region where the subject does not have the visibility for each combination of stimulus values of a color stimulus of a visual target.

Abstract: Disclosed are: a practical color changeable optical filter that can change hue or saturation by a relatively simple structure, the color changeable optical filter including two or more polarizers 20, 30 containing a dichroism pigment and a frame 10 that supports the polarizers 20, 30, wherein a polarization plane of light incident on at least one polarizer 30 or a polarization plane of light output from at least one polarizer 20 is rotated relatively, whereby the hue or saturation of light passing through the optical filter is changed; and eyeglasses provided with the color changeable optical filter.

Abstract: An analysis unit determines at least two boundaries by determining; in a coordinate system indicating a correlation between a luminance contrast value between a luminance of an attention portion and a luminance of a background portion, and a luminance average value of a visual target including the attention portion and the background portion; the boundary between a region where a subject has a visibility and a region where the subject does not have the visibility for each combination of stimulus values of a color stimulus of a visual target.

Abstract: Disclosed are: a practical color changeable optical filter that can change hue or saturation by a relatively simple structure, the color changeable optical filter including two or more polarizers 20, 30 containing a dichroism pigment and a frame 10 that supports the polarizers 20, 30, wherein a polarization plane of light incident on at least one polarizer 30 or a polarization plane of light output from at least one polarizer 20 is rotated relatively, whereby the hue or saturation of light passing through the optical filter is changed; and eyeglasses provided with the color changeable optical filter.