Patent ID: 8655062

Claim:
An image decoding method of an image processing apparatus comprising a central processing unit (CPU) and a graphics processing unit, wherein the CPU comprises an entropy decoder, an inverse discrete cosine transformation (IDCT) module, a color space converting module, a first table specification and a second table specification, the method comprising: retrieving input image data using the CPU; processing the input image data as a two-dimensional quantized image according to the first table specification using the entropy decoder; performing a dequantizing operation on the input image data according to the second table specification using the graphics processing unit, wherein the dequantizing operation performed by the graphics processing unit comprises: retrieving the two-dimensional quantized image from the entropy decoder; retrieving a table quantized image from the second table specification; generating an empty image; performing a transforming and lighting operation and a rasterizing operation on the empty image; performing a mapping operation on the two-dimensional quantized image and the empty image; setting texture wrapping of the table quantized image to a repeat mode so as to expand the table quantized image as an M×N pixel matrix; performing a modulating operation on the two-dimensional quantized image and the table quantized image to generate a discrete cosine coefficient; and rendering the two-dimensional quantized image to a frame buffer object according to the discrete cosine coefficient for generating the dequantized input image data; performing an IDCT operation on the dequantized input image data using the IDCT module; and performing a color space conversion on the IDCT input image data and outputting the converted image data using the color space converting module.