Patent ID: 9129413
Filing Date: 2015-09-08
Classification: G06T

Abstract:
1. A method for aligning a plurality of first digital pictures, each first digital picture comprising a plurality of pixels wherein each pixel is associated with a pixel value, the method comprising: generating, by a processor, a second digital picture for each first digital picture, wherein generating the second digital picture for the first digital picture comprises determining, for each of a plurality of pixels of the first digital picture, a number representing the pixel values of pixels in a neighborhood of the pixel relatively to the pixel value of the pixel; assigning, by a processor, the number as a pixel value to a pixel of the second digital picture corresponding to the pixel of the first digital picture; generating, by a processor, aligning parameters based on the plurality of second digital pictures; and aligning, by a processor, the plurality of first digital pictures based on the aligning parameters; wherein determining, for each of a plurality of pixels of the first digital picture, a number representing the pixel values of pixels in the neighborhood of the pixel relatively to the pixel value of the pixel comprises determining a relative value for each pixel of the pixels in the neighborhood of the pixel based on comparison of the pixel value of the pixel and the pixel value of the pixel in the neighborhood of the pixel; and determining the number representing the pixel values of the pixels in the neighborhood of the pixel relatively to the pixel value of the pixel based on the determined relative values; wherein determining a relative value for each pixel of the pixels in the neighborhood of the pixel based on comparison of the pixel value of the pixel and the pixel value of the pixel in the neighborhood of the pixel comprises determining a difference between the pixel value of the pixel and the pixel value of the pixel in the neighborhood of the pixel; and comparing the difference with a threshold value; wherein the threshold value is determined based on a comparagram which is a two-dimensional joint histogram between a reference first digital picture and a target first digital picture of a plurality of first digital pictures.