公开(公告)号：US06810155B1

公开(公告)日：2004-10-26

申请号：US09367532

申请日：1999-08-16

Applicant: Hou-Chun Ting ,  Chun-Hung Chen ,  Shu-Lin Fan-Chiang ,  Meng-Hsui Wei

Inventor： Hou-Chun Ting ,  Chun-Hung Chen ,  Shu-Lin Fan-Chiang ,  Meng-Hsui Wei

IPC: G06K932

CPC classification number: G06T3/4007

Abstract: An apparatus for scaling an image composed of pixels by a scale factor is described. The apparatus includes a local image analyzer for identifying from among said pixels a target pixel and a set of pixels proximate to said target pixel and determining a type for the target pixel. The apparatus includes a linear interpolation function that is parameterized by a horizontal linear interpolation coefficient and a vertical linear interpolation coefficient. The apparatus includes an interpolation coefficient generator for defining the horizontal and vertical linear interpolation coefficients. The apparatus includes an image scaler for scaling said image in a neighborhood of the target pixel by the scale factor using the linear interpolation function with the horizontal linear interpolation coefficient and the vertical linear interpolation coefficient. A method of scaling a source image. The source image comprised of a first plurality of pixels, by a scale factor said method for scaling comprising the acts of: determining a first type of a target pixel, said target pixel in said plurality of pixels; selecting a first interpolation function for said target pixel from said first type of said target pixel; and scaling said source image using said first interpolation function for scaling said target pixel.

Abstract translation: 描述用于按比例因子缩放由像素组成的图像的装置。 该装置包括：本地图像分析器，用于从所述像素中识别目标像素和靠近所述目标像素的一组像素，并确定目标像素的类型。 该装置包括由水平线性插值系数和垂直线性插值系数参数化的线性插值函数。 该装置包括用于定义水平和垂直线性内插系数的内插系数发生器。 该装置包括图像缩放器，用于使用具有水平线性插值系数和垂直线性插值系数的线性插值函数，通过比例因子缩放目标像素的邻域中的图像。 缩放源图像的方法。 所述源图像由第一多个像素组成，所述比例因子所述的缩放方法包括以下动作：确定所述多个像素中的所述目标像素的目标像素的第一类型; 从所述第一类型的所述目标像素中选择所述目标像素的第一内插函数; 以及使用所述第一插值函数缩放所述源图像以缩放所述目标像素。