Abstract: A lens apparatus to be attached to an imaging apparatus includes a storage unit configured to store correction data on distortion aberrations in association with a plurality of focal lengths, and a communication unit configured to transmit the correction data.

Abstract: An image processing device according to the present technology includes: a foreground-background classification unit configured to classify an input image into a foreground image portion which is a portion in which a subject in a foreground is captured and a background image portion which is a portion in which a subject in a background farther than the foreground image portion is captured; a foreground correction unit configured to correct the foreground image portion; and an inconsistency correction unit configured to correct an inconsistent portion caused by the correction of the foreground image portion by the foreground correction unit.

Abstract: A projection optical system of an image display apparatus that includes a lens system and a concave reflection surface. The lens system is has a positive refractive power as a whole. The concave reflection surface reflects the image light emitted from the lens system toward an object. The projection optical system is configured such that a relationship 0<|??(hmax) ??(0.9·hmax)|/?(hmax)<0.056 is satisfied, where a light beam height from the reference axis is h, an angle with respect to an optical axis height direction of a tangent line of a function Z(h) representing a shape of the concave reflection surface corresponding to the light beam height h is ?(h), an amount of change in the angle ?(h) is ??(h), and the light beam height h of a reflection point farthest from the reference axis of the concave reflection surface for reflecting the image light is hmax.

Abstract: An image display apparatus that includes a first light collecting-reflecting device (10, 11) which image light (L0) from an image forming apparatus enters, and a second light collecting-reflecting device (20, 21) which second light (L2), of the image light, having passed through the first light collecting-reflecting device enters. The first light collecting-reflecting device has transmission action and light collecting-reflecting action with respect to the image light. The first light collecting-reflecting device collects and reflects first light (L1), of the entering image light, toward a first conversion position in a viewer's eye (201). The second light collecting-reflecting device has at least the light collecting-reflecting action with respect to the image light. The second light collecting-reflecting device causes the second light to reenter the first light collecting-reflecting device and collects and reflects the second light toward a second conversion position.

Abstract: An image display apparatus that includes a first light collecting-reflecting device (10, 11) which image light (L0) from an image forming apparatus enters, and a second light collecting-reflecting device (20, 21) which second light (L2), of the image light, having passed through the first light collecting-reflecting device enters. The first light collecting-reflecting device has transmission action and light collecting-reflecting action with respect to the image light. The first light collecting-reflecting device collects and reflects first light (L1), of the entering image light, toward a first conversion position in a viewer's eye (201). The second light collecting-reflecting device has at least the light collecting-reflecting action with respect to the image light. The second light collecting-reflecting device causes the second light to reenter the first light collecting-reflecting device and collects and reflects the second light toward a second conversion position.

Abstract: An image display device includes: an optical modulator; and an optical compensation element configured to cancel out phase difference generated within the optical modulator; wherein the optical compensation element is installed in a state in which the brightness of a projected image corresponding to a region having relatively great phase difference within the optical modulator becomes a minimal value, at the minimum driving voltage to be applied to the optical modulator.

Abstract: An image display device includes: an optical modulator; and an optical compensation element configured to cancel out phase difference generated within the optical modulator; wherein the optical compensation element is installed in a state in which the brightness of a projected image corresponding to a region having relatively great phase difference within the optical modulator becomes a minimal value, at the minimum driving voltage to be applied to the optical modulator.