Imaging device and method to provide bokeh effect in captured image by determining distance and focus of captured objects in secondary image sequence

摘要

An imaging device is provided that includes an image blur evaluator, an imaging processor, a distance map generator and a filter. The image blur evaluator evaluates the amount of blurring due to a camera shake. The imaging processor captures a plurality of secondary images of the same object at different lens positions by driving a photographing lens. The distance map generator prepares a distance map including distance information of the objects captured in each area of an image based on the contrast in each of the areas. The filter reduces noise in the distance map. A relatively large filter size is selected for the filter when blurring is evaluated to be relatively large and a relatively small filter size is selected for the filter when the evaluated blurring is relatively small.

主权项

1. An imaging device comprising:
an image blur evaluator that evaluates an amount of blurring due to a camera shake; an imaging processor that captures a plurality of secondary images of a same object at different lens positions by driving a photographing lens; a distance map generator that divides each of the plurality of secondary images into a plurality of areas, and prepares a distance map including distance information of the object in each area of the plurality of areas, the distance information being obtained based on contrast in each area of the plurality of areas in each of the secondary images, each of the plurality of areas including at least one pixel; and a filter that is applied to the distance map to reduce noise in the distance map; wherein a relatively large filter size is selected for the filter when the amount of blurring is evaluated to be relatively large, and a relatively small filter size is selected for the filter when the evaluated blurring is relatively small.