System and process for image rescaling using adaptive interpolation kernel with sharpness and de-ringing control

A method of rescaling digital video, the method comprising:

• receiving input support pixels y1 to yn at an image data input;
• generating a sharpness control parameter Kshp at a sharpness control module;
• generating an interpolated pixel ys based on the input support pixels y1 to yn at an 8-tap filter;
• adjusting a sharpness of the interpolated pixel ys based at least partly upon the sharpness control parameter Kshp at the interpolated pixel generator;
• and
• outputting the adjusted interpolated pixel ys for display.

A digital video rescaling system comprising:

• an image data input configured to receive input support pixels y1 to yn;
• an interpolated pixel generator configured to use an 8-tap filter to generate an interpolated pixel value ys based on the input support pixels y1 to yn;
• a de-ringing control unit configured to modify the interpolated pixel ys adaptively to a local image feature Kfreq to generate an output yout;
• and
• an output module configured to output the output yout for display.

A method of rescaling digital video, the method comprising:

• receiving support pixels y1 to yn at an image data input;
• using an 8-tap filter to generate an interpolated pixel ys based on the input support pixels y1 to yn at an interpolated pixel generator;
• modifying the interpolated pixel ys adaptively to a local image feature Kfreq to generate an output yout at a de-ringing control unit;
• and
• outputting the output yout for display.

A method in accordance with 17 further comprising:

• subtracting the comparison result ym from the interpolated pixel value ys;
• multiplying the difference by the local image feature Kfreg;
• and
• adding the product to comparison result ym to generate yout at the de-ringing control unit.