07245326 is referenced by 19 patents and cites 21 patents.

A method for detecting an edge and generating an interpolated edge pixel at a target pixel position between two lines of an interlace scan image first determines gradient intensities in the horizontal and vertical directions and then calculates the angle of the edge by comparing the gradient intensities. The interpolated pixel value is calculated from samples in the interlace scan image that lie along the identified angle and are proximate to the target pixel position. The method represents the gradient strengths and the difference between them as bit strings; locates the most significant non-zero bit in the larger gradient value; divides the value of the corresponding bit position in the difference string, and a predetermined number of following positions, by increasing powers of 2; sums the results; subtracts the sum from 1.0 and uses the inverse tangent function to calculate the angle of the edge.

Title
Method of edge based interpolation
Application Number
9/988934
Publication Number
7245326 (B2)
Application Date
November 19, 2001
Publication Date
July 17, 2007
Inventor
Christopher J Orlick
Newtown
PA, US
Agent
RatnerPrestia
Assignee
Matsushita Electric Industrial
JP
IPC
H04N 11/20
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