SELECTION EDITING USING A LOCALIZED LEVEL SET ALGORITHM

摘要

Techniques are disclosed for selecting a targeted portion of a digital image. In one embodiment, a selection cursor having central and peripheral regions is provided. The central region is used to force a selection or a deselection, and therefore moving the central region over a portion of the image causes that portion of the image to be selected or deselected, respectively. The peripheral region of the cursor surrounds the central region and defines an area where a localized level set algorithm for boundary detection is performed. This provides more accurate boundary detection within the narrowly-focused peripheral region and eliminates the need to apply the level set algorithm across the entire image. Thus moving the peripheral region of the selection cursor over a boundary of the targeted portion of the image applies the level set algorithm in that boundary region and increases the likelihood that the boundary will be detected accurately.

主权项

1. A method for defining a selection region in a source image, the method comprising:
displaying, on a display device, a selection cursor over the source image, the selection cursor having an interior region and a peripheral region; and locating an initial position of a selection mask boundary in a portion of the source image that is overlaid by the peripheral region of the selection cursor, wherein the initial position of the selection mask boundary is at least partially based on a boundary that is detected as a result of selectively applying a boundary detection algorithm to the portion of the source image that is overlaid by the peripheral region of the selection cursor, and wherein the boundary detection algorithm is not applied in a portion of the source image that is overlaid by the interior region of the selection cursor.