146 results about "Relative shift" patented technology

A focus detection device comprises: an image shift detection unit that detects a relative shift amount of a pair of images formed by a pair of light fluxes having passed through an optical system; and a conversion unit that converts the shift amount to a defocus amount based upon dimensional information of an exit pupil corresponding to an aperture restricting light flux in the optical system and distance information of the exit pupil indicating distance to the exit pupil from a predetermined imaging plane of the optical system.

An image sensing apparatus including: an image sensor including a plurality of focus detection pixel pairs that perform photoelectric conversion on each pair of light beams that have passed through different regions of a photographing lens and output an image signal pair; a flash memory that stores shift information on relative shift between an optical axis of the photographing lens and a central axis of the focus detection pixel pairs; a correction unit that corrects a signal level of the image signal pair based on the shift information and exit pupil information of the photographing lens so as to compensate for an unbalanced amount of light that enters each of the focus detection pixel pairs; and a focus detection unit that detects a focus of the photographing lens using the image signal pair corrected by the correction unit.

The invention relates to a tissue displacement estimation method and system based on ultrasonic echo radio frequency signals. The method includes a converting step, namely converting the entire-frame ultrasonic echo radio frequency signals into analytic signals; a segmenting step, namely segmenting the entire-frame analytic signals according to the preset window length and acquiring segmented window data segments; a product summary step, namely performing once no-offset product summary on the segmented window data segments corresponding to two adjacent frames and acquiring a target plurality; a phase calculating step, namely calculating the phase of the target plurality; and a corresponding displacement estimating step, namely utilizing the phase to calculate and acquire corresponding displacement between two frame signals. According to the tissue displacement estimation method based on the ultrasonic echo radio frequency signals, the entire-frame ultrasonic echo radio frequency signals are converted into the analytic signals once, calculating speed is increased greatly, the corresponding displacement between two frame signals can be acquired through once product summary, calculating amount is reduced, calculating efficiency is improved, and complexity is low.