Patent ID: 7583323

Claim:
An image scaling method for calculating a pixel value of a target pixel within a scaled image block scaled from an image block, the method comprising: selecting a plurality of reference pixels from the image block, wherein each reference pixel has a pixel value and corresponds to a transparency parameter, and the reference pixel with a transparency parameter less than or equal to a predetermined value is defined as a background pixel and the reference pixel with a transparency parameter greater than the predetermined value is defined as a foreground pixel; respectively setting a corresponding weight value for each reference pixel; adjusting the weight values of the reference pixels according to a combination of the transparency parameters of the reference pixels which is recorded in a look-up table, wherein the look-up table stores all combinations of the transparency parameters of the reference pixels and stores the adjusted weight values of the reference pixels corresponding to each combination of the transparency parameters; and generating the pixel values of the reference pixels to generate the pixel value of the target pixel according to the adjusted weight values of the reference pixels.