Abstract: An air outlet duct structure, an air outlet panel and a patio type air conditioner indoor unit are provided. The air outlet duct structure includes a first air duct wall and a second air duct wall arranged oppositely. An air outlet passage is formed between the first air duct wall and the second air duct wall. The first air duct wall includes a plurality of concave curved surfaces connected along an airflow direction, wherein curvature radii of the plurality of concave curved surfaces decrease sequentially along the airflow direction.

Abstract: Techniques are described for identifying correspondences between images to generate a fundamental matrix for the camera positions related to the images. The resultant fundamental matrix enables epipolar geometry to correlate common features among the images. Correspondences are identified by confirming feature matches across images by applying a homography to data representing features across images. Further techniques are described herein for generating a representation of a boundary of a feature of a structure based on a digital image. In one or more embodiments, generating a representation of a boundary of a particular feature in a digital image comprises determining a portion of the image that corresponds to the structure, and determining a portion of the image that corresponds to the particular feature. One more vanishing points are associated with the portion of the image corresponding to the particular feature.