System and method for generating decoded digital video image data

An apparatus for displaying an image on a portion of a display, that portion being a subsection of the display and having a lower resolution than the display, comprising:

• means for receiving an array of DCT coefficients representing a block of image data of one of a plurality of types of pictures;
• means for performing IDCT on a sub-portion of the DCT coefficients to obtain a block of pixel data equal in size to the sub-portion if the block of image data represents a first type of picture;
• means for performing motion compensation on the block of pixel data to obtain a second block of pixel data;
• means for scaling the second block of pixel data based on a size of the portion of the display;
• and
• means for displaying the scaled pixel data on the portion of the display.

An apparatus for decoding image data comprising:

• means for receiving encoded image data comprising I-picture, P-picture, and B-picture data;
• means for performing IDCT decoding on I-picture data at a first resolution;
• means for scaling the decoded I-picture data based on a display size, and outputting the scaled I-picture data for display;
• means for performing IDCT decoding on P-picture data at the first resolution;
• means for performing motion compensation processing on the decoded P-picture data;
• means for scaling the motion-compensated P-picture data based on the display size, and outputting the scaled P-picture data for display;
• means for performing IDCT decoding on B-picture data at a second resolution, the second resolution being lower than the first resolution;
• means for performing motion compensation processing on the decoded B-picture data;
• and
• means for scaling the motion-compensated B-picture data to the display size;
• and
• outputting the scaled B-picture data for display.

An apparatus for decoding image data comprising:

• means for receiving encoded image data comprising I-picture, P-picture, and B-picture data;
• means for performing IDCT decoding on I-picture and P-picture data at a first resolution and on B-picture data at a second resolution, the second resolution being lower than the first resolution;
• means for performing motion compensation processing on the decoded P-picture and B-picture data;
• means for scaling the decoded and motion compensated image data based on a display size;
• and
• means for outputting the scaled image data for display.

A system for or displaying an image on a portion of a display, that portion being a subsection of the display and having a lower resolution than the display, comprising:

• an IDCT decoder for performing IDCT decoding on I-picture and P-picture data at a first resolution and on B-picture data at a second resolution, the second resolution being lower than the first resolution;
• a processor for performing motion compensation processing on the decoded P-picture and B-picture data;
• and
• a video scaler for scaling the decoded and motion compensated I-picture, P-picture, and B-picture data based on the size of the portion of the display;
• and
• a video unit for displaying the scaled pixel data on the portion of the display.

A system for displaying an image on a portion of a display, that portion being a subsection of the display and having a lower resolution than the display, comprising:

• an IDCT decoder for receiving an array of DCT coefficients representing a block of image data of one of a plurality of types of pictures and performing IDCT on a sub-portion of the DCT coefficients to obtain a block of pixel data equal in size to the sub-portion if the block of image data represents a first type of picture;
• a processor for performing motion compensation on the block of pixel data to obtain a second block of pixel data;
• a video scaler for scaling the second block of pixel data based on a size of the portion of the display;
• and
• a video unit for displaying the scaled pixel data on the portion of the display.

A system for decoding image data comprising:

• an IDCT decoder for
• receiving encoded image data comprising I-picture, P-picture, and B-picture data;
• performing inverse IDCT decoding on I-picture data at a first resolution;
• performing IDCT decoding on P-picture data at the first resolution;
• and
• performing IDCT decoding on B-picture data at a second resolution, the second resolution being lower than the first resolution;
• a processor for
• performing motion compensation processing on the decoded P-picture data;
• and
• performing motion compensation processing on the decoded B-picture data;
• and
• a video scaler for
• scaling the decoded I-picture data based on a display size, and outputting the scaled I-picture data for display;
• scaling the motion-compensated P-picture data based on the display size, and outputting the scaled P-picture data for display;
• and
• scaling the motion-compensated B-picture data to the display size, and outputting the scaled B-picture data for display.

A system for decoding image data comprising:

• an IDCT decoder for performing IDCT decoding on I-picture and P-picture data at a first resolution and on B-picture data at a second resolution, the second resolution being lower than the first resolution;
• a processor for performing motion compensation processing on the decoded P-picture and B-picture data;
• a video scaler for scaling the decoded and motion compensated I-picture, P-picture, and B-picture data based on a display size;
• and
• a video unit for outputting the scaled data for display.