Method for distinguishing a 3D image from a 2D image and for identifying the presence of a 3D image format by feature correspondence determination

摘要

A method identifies the presence of a three-dimensional (3D) image format in received image through the use of feature matching and correspondence. The received image is sampled using a candidate 3D format to generate two sub-images from the received image. Initially, these sub-images are compared to determine whether these sub-images are similar with respect to structure. If the sub-images are not similar, a new 3D format is selected and the method is repeated. If the sub-images are similar, features are detected in the two sub-images and a correspondence is formed between features that match in the two sub-images. Positional differences are computed between corresponding features. The amount and uniformity of the positional differences are then used to determine whether the format is 2D or 3D and, if 3D, which of the 3D formats was used for the received image.

主权项

1. A method for identifying the presence of a three-dimensional (3D) image format in a received image, the method comprising:
generating first and second sub-images from the received image using a sampling method corresponding to a candidate 3D format selected from a plurality of 3D formats; detecting at least one feature in the first and second sub-images; determining a correspondence between the at least one feature in the first sub-image and the at least one feature in the second sub-image; computing positional differences between the at least one feature in the first sub-image that correspond to the at least one feature in the second sub-image; comparing said first and second sub-images to determine whether the first and second sub-images are similar with respect to structure; wherein, if said positional differences are determined to be uniform and less than or equal to a threshold, determining whether each 3D format of the plurality of 3D formats has been selected as a candidate 3D format; wherein if the first and second sub-images are determined to be not similar in structure from said comparing, determining whether each 3D format of the plurality of 3D formats has been selected as a candidate 3D format; and if all 3D formats in the plurality of 3D formats have been selected, identifying the received image as a two-dimensional (2D) format; and if all 3D formats in the plurality of 3D formats have not been selected, selecting as the candidate 3D format a 3D format not previously selected from the plurality of 3D formats and repeating the generating and computing steps using the not previously selected 3D format; and wherein, if said positional differences are determined not to be uniform and are determined to be greater than the threshold, identifying the received image as being formatted in a candidate 3D format used to make such determination; and wherein, if the first and second sub-images are determined to be similar in structure from said comparing, executing the step of detecting one or more features in each of the first and second sub-images.