| 摘要 |
A method, image recognition system, computer program, etc., for determining image orientation. The invention classifies potential sky pixels in the image by color, identifies spatially contiguous regions of the potential sky pixels, identifies actual sky regions by eliminating ones of the spatially contiguous regions that have a texture above a predetermined texture threshold, computes desaturation gradients of the actual sky regions, classifies the image as one of portrait and landscape based on average absolute values of horizontal and vertical desaturation gradient of pixels within each of the actual sky regions, determines orientation of the image based on a polarity of the average horizontal and vertical desaturation gradients, and confirms that the actual sky regions are true sky regions by comparing the desaturation gradients with a predetermined desaturation gradient for sky. <IMAGE> |
