Image interpolation device and method of preventing aliasing

An image interpolation method, the method comprising:

• interpolating an image captured by an image detector into an n2-times-density RGB image, and calculating high-frequency components RH, GH, and BH and low-frequency components RL, GL, and BL at pixels of respective R, G, and B images of the captured image;
• detecting an aliased region in the n2-times-density RGB image based on magnitudes and signs of the high-frequency components RH, GH, and BH at the pixels of the n2-times-density RGB image;
• and
• performing an anti-aliasing operation on the detected aliased region and restoring an original image from the n2-times-density RGB image having the aliased region.

A method of compensating for aliasing usable with an image interpolation apparatus, the method comprising:

• receiving a plurality of color image signals having a plurality of corresponding high frequency components;
• detecting one or more regions from among a plurality of pixels of the color image signals where aliasing occurs according to a comparison of the high frequency components;
• determining whether one or more pixels that correspond to the one or more detected alias regions are one of a maximum value region and a minimum value region;
• performing a first compensation operation when the one or more pixels that correspond to the one or more detected alias regions are determined to be the maximum value region;
• and
• performing a second compensation operation when the one or more pixels that correspond to the one or more detected alias regions are determined to be the minimum value region.

A method of compensating for aliasing in an image having a plurality of pixels, the method comprising:

• receiving a plurality of image signals of the image having the plurality of pixels including maximum value regions and minimum value regions;
• and
• for each pixel in the minimum and maximum regions, performing a compensation operation including:
• if the pixel is determined to correspond to a minimum value region, determining a first compensation value by adding a minimum value from among the pixel and at least two neighboring pixels to a value of the pixel, and
• if the pixel is determined to correspond to a maximum value region, determining a first compensation value by adding a maximum value from among the pixel and the at least two neighboring pixels to the value of the pixel, and if one of the at least two neighboring pixels is a minimum value region, determining a second compensation value by adding a difference of a first compensated value of the one neighboring pixel that corresponds to the minimum value region and an original pixel value of the one neighboring pixel that corresponds to the minimum value region to the first compensated pixel value of the pixel.

A computer readable medium containing executable code to perform an image interpolation method, the medium comprising:

• a first executable code to interpolate an image captured by an image detector into an n2-times-density RGB image, and calculating high-frequency components RH, GH, and BH and low-frequency components RL, GL, and BL at pixels of respective R, G, and B images of the captured image;
• a second executable code to detect an aliased region in the n2-times-density RGB image based on magnitudes and signs of the high-frequency components RH, GH, and BH at the pixels of the n2-times-density RGB image;
• and
• a third executable code to perform an anti-aliasing operation on the detected aliased region and restoring an original image from the n2-times-density RGB image having the aliased region.