05054100 is referenced by 105 patents and cites 7 patents.

Methods and apparatus for interpolating existing gray-level pixel data to obtain new pixel values during image reduction and enlargement. A quadratic interpolation equation is used to apply location weighting factors to the density values of neighboring pixels. Edge strength modifying factors are used to modify the weighting factors in the x, y, and diagonal directions. In one embodiment, the modifying factors are set to greater than unity when the corresponding edge strength is greater than a predetermined threshold value. In another embodiment, the modifying factors are a non-linear function of the edge strength. These techniques preserve the sharpness of high contrast edges in the original image.

Title
Pixel interpolator with edge sharpening
Application Number
7/437466
Publication Number
5054100
Application Date
November 16, 1989
Publication Date
October 1, 1991
Inventor
Hwai T Tai
Rochester
NY, US
Agent
Norman Rushefsky
Assignee
Eastman Kodak Company
NY, US
IPC
G06K 9/00
View Original Source