Patent Number: 8,792,013

Title: Method for determining the extent of a foreground object in an image

Abstract: Embodiments are directed towards determining within a digital camera whether a pixel belongs to a foreground or background segment within a given image by evaluating a ratio of derivative and deviation metrics in an area around each pixel in the image, or ratios of derivative metrics across a plurality of images. For each pixel within the image, a block of pixels are examined to determine an aggregate relative derivative (ARD) in the block. The ARD is compared to a threshold value to determine whether the pixel is to be assigned in the foreground segment or the background segment. In one embodiment, a single image is used to determine the ARD and the pixel segmentation for that image. Multiple images may also be used to obtain ratios of a numerator of the ARD, useable to determine an extent of the foreground.

Inventors: Levy; Noam (Karmiel, IL)

Assignee: Qualcomm Technologies, Inc.

International Classification: H04N 5/228 (20060101)

Expiration Date: 7/29/12018