Apparatus and method for capturing a scene image with reduced image blur in a standard exposure using ambient lighting

摘要

Apparatus and an accompanying method, for use in illustratively a photographic camera for selecting shutter speed and lens aperture values to provide a given exposure level in a captured image, e.g. a photograph, of a scene. specifically, first an appropriate shutter speed value is initially selected as that which sufficiently reduces image blur attributable to camera shake. The shutter speed selection is based upon lens focal length and, where appropriate, camera shake data obtained through either accessing stored camera shake data or measuring actual real-time shake data. Once the shutter speed has been selected, then the lens aperture value is initially chosen as that, which in conjunction with the selected shutter speed, provides a baseline, typically an ISO normal, exposure of the scene, If the chosen lens aperture provides a greater depth-of-field than that required by the scene, i.e., as defined by the location of primary and background subjects relative to the camera, then the lens aperture value is changed from its initially selected value to a new value that provides a depth-of-field which approximately matches the scene requirement. The shutter speed is then increased from its initially chosen value to a new value that, in conjunction with the changed lens aperture value, will still yield the baseline exposure and also advantageously provide additional compensation against camera shake.