Edge enhancement process and system

An edge enhancement system, comprising:

• means for determining one or more properties of an edge of image data;
• means for generating one or more weighting factors on the basis of said one or more properties of said edge;
• means for processing said image data to determine an orientation of said edge;
• means for filtering said image data along said orientation if said orientation is more vertical than horizontal;
• and
• means for scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement.

A computer readable storage medium having stored thereon program code for causing a processor to execute a method comprising:

• determining one or more properties of an edge of image data;
• generating one or more weighting factors on the basis of said one or more properties of said edge;
• processing said image data to determine an orientation of said edge;
• filtering said image data along said orientation if said orientation is more vertical than horizontal;
• and
• scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement.

A display processor, including:

• a video input for receiving an input image;
• and
• an edge enhancement system that includes:
• a selective edge controller for determining one or more properties of an edge of image data, and for generating one or more weighting factors on the basis of said one or more properties of said edge;
• a scaling component for scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement;
• and
• an aliasing protector for determining an amount of aliasing for said edge and for generating an aliasing weighting factor on the basis of said amount of aliasing to scale said edge enhancement signal.

A television receiver, including:

• a television input for receiving a TV image signal;
• and
• an edge enhancement system that includes:
• a selective edge controller for determining one or more properties of an edge of image data, and for generating one or more weighting factors on the basis of said one or more properties of said edge;
• a scaling component for scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement;
• an edge orientation detector for determining an orientation of said edge;
• and
• an edge filter for filtering said image data along said orientation if said orientation is substantially vertical.

An edge enhancement process, comprising:

• determining one or more properties of an edge of image data;
• generating one or more weighting factors based on the one or more properties of the edge;
• determining if the edge is a substantially vertical edge or a substantially horizontal edge;
• producing an edge enhancement signal that is weighted by the one or more weighting factors;
• scaling the edge enhancement signal by an additional weighting factor in response to determining that the edge is a substantially horizontal edge;
• and
• using the edge enhancement signal to enhance the edge.

An edge enhancement process, including:

• determining one or more properties of an edge of image data;
• generating one or more weighting factors on the basis of said one or more properties of said edge;
• processing said image data to determine an orientation of said edge;
• determining whether a corner is present in said image data if said orientation is not determined or if said orientation is horizontal;
• and
• scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement.

An edge enhancement process, including:

• generating first derivative values from image data;
• identifying, based on said first derivative values, turning points that meet at least one predetermined noise criterion;
• identifying maximum and minimum turning points from said turning points;
• and
• selecting, from the identified maximum and minimum turning points, a maximum turning point and a minimum turning point that are located on opposing sides of, and closest to, a center location of said image data to provide values and locations of maximum and minimum pixels of an edge;
• determining one or more properties of the edge of said image data;
• generating one or more weighting factors on the basis of said one or more properties of said edge;
• and
• scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement.

An edge enhancement system, including:

• a selective edge controller for determining one or more properties of an edge of image data, and for generating one or more weighting factors on the basis of said one or more properties of said edge;
• a scaling component for scaling an edge enhancement signal by said one or more weighting factors to control the degree of edge enhancement;
• an edge orientation detector for determining an orientation of said edge;
• and
• an edge filter for filtering said image data along said orientation if said orientation is substantially vertical.