04985764 is referenced by 40 patents and cites 6 patents.

In this invention, a correlation data and interpolation data generation circuit generates a vertical correlation signal, a plurality of left-downwardly inclined direction correlation signals, and a plurality of right-downwardly inclined direction correlation signals. The vertical direction correlation signal is generated by deriving a difference between two pixels which lie on a vertical line passing the position (center) of a pixel to be interpolated. The left-downwardly inclined direction correlation signals are generated by deriving a difference between one pair of pixels among pixels present in four regions defined by the vertical line and a horizontal line crossing at the center, which pair of pixels are arranged symmetrically in relation to the center and which respectively lie in the upper right region and lower left region, and the right-downwardly inclined direction correlation signals generated by deriving a difference between one pair of pixels which pair of pixels are arranged symmetrically in relation to the center and which respectively lie in the upper left region and lower right region. A correlation detection section receives the vertical direction correlation information, the left-downwardly inclined direction correlation signals, and the right-downwardly inclined direction correlation signals, and detects the smallest one of the absolute values of those signals and outputs data indicating the direction of pixels providing the smallest absolute value as a correlation detecting signal.

Title
Apparatus for detecting a pixel correlation and generating an interpolation signal for a digital television signal
Application Number
7/391294
Publication Number
4985764
Application Date
August 8, 1989
Publication Date
January 15, 1991
Inventor
Koichi Sato
Yokohama
JP
Agent
Oblon Spivak McClelland Maier & Neustadt
Assignee
Kabushiki Kaisha Toshiba
JP
IPC
H04N 5/14
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