Method, device and system for estimating subpixel position of extremum point in image

摘要

To provide a method, a device and a system for estimating a sub-pixel position of an extreme point in an image using a parametric function.SOLUTION: In an estimation method, a parametric function is locally fitted to a group of neighboring pixels in an image and identifies a spatial position of an extreme point of the parametric function. When a corresponding extreme point is of a different type from the extreme point in the image, or when the extreme point of the parametric function is positioned outside the area defined by the pixel positions in the group of neighboring pixels, pixels are removed from the group of neighboring pixels and fitting of the parametric functions is repeated. As a result, a sub-pixel position is estimated as a position of the extreme point of the parametric function. An uncertainty level of the estimated sub-pixel position is estimated as the number of iterations required before reaching a sub-pixel position estimate.SELECTED DRAWING: Figure 3