Method and apparatus for interpolation

A method for interpolating between a first and second pixel in a line of pixels in an image in a video display system, the first pixel having a first pixel value and a first coordinate on the line, and the second pixel having a second pixel value and a second coordinate on the line to determine an interpolated pixel value for an intermediate pixel having a first intermediate coordinate on the line between the first and second coordinates, the method comprising:

• determining in the data processing resources, a weight factor for the first intermediate coordinate by inputting the first intermediate coordinate into a first quadratic blending function if the first intermediate coordinate is within a first range between the first coordinate and the second coordinate, or by inputting the first intermediate coordinate into a second quadratic blending function if the first intermediate coordinate is within a second range between the first coordinate and the second coordinate;
• calculating in the data processing resources the interpolated pixel value in response to the weight factor for the first intermediate coordinate and in response to a function of the first pixel value and the second pixel value;
• inserting an intermediate pixel having the interpolated value in the first intermediate coordinate on the line between the first and second pixels;
• and
• outputting a modified line including said intermediate pixel.

An apparatus for interpolating between a first and second pixel in a line of pixels in an image in a video display system, the first pixel having a first pixel value and a first coordinate on the line, and the second pixel having a second pixel value and a second coordinate on the line, the apparatus comprising:

• a buffer that stores the first and second pixel values for the first and second pixels;
• logic coupled to the buffer which performs a process including
• determining a weight factor for a first intermediate coordinate between the first and second coordinates by inputting the first intermediate coordinate into a first quadratic blending function if the first intermediate coordinate is within a first range between the first coordinate and the second coordinate, or by inputting the first intermediate coordinate into a second quadratic blending function if the first intermediate coordinate is within a second range between the first coordinate and the second coordinate,
• calculating the interpolated pixel value in response to the weight factor for the first intermediate coordinate and in response to a the first pixel value and the second pixel value;
• inserting an intermediate pixel having the interpolated value in the first intermediate coordinate on the line between the first and second pixels;
• and
• outputting a modified line including said intermediate pixel.