Decoding Image

A computer readable medium embodied with instructions to cause a data processing apparatus to perform an image decoding method comprising:

• generating motion compensation information and a quantized result of an error image that represents a difference between a current image to be restored and a prediction image obtained by performing inter prediction on the current image from a bitstream of the current image;
• receiving a reference image of the current image from an external memory unit by using the generated motion compensation information;
• and
• restoring the current image based on the received reference image of the current image and the quantized result of the error image,
• wherein receiving the reference image of the current image is performed while restoring a previous image, and restoring the current image is performed while receiving a reference image of a subsequent image.

An image decoding apparatus comprising:

• an entropy decoding unit to generate motion compensation information and a quantized result of an error image representing a difference between a current image to be restored and a prediction image obtained by performing inter prediction on the current image by performing entropy decoding on a bitstream that is an encoded result of the current image;
• and
• an image restoring unit to receive a reference image of the current image from an external memory unit by using the generated motion compensation information and to restore the current image based on the received reference image and the quantized result,
• wherein the image restoring unit is configured to restore a previous image while receiving the reference image of the current image, and receive the reference image of a subsequent image while restoring the current image.

An image decoding system comprising:

• a memory unit to store reference images;
• and
• an image decoding apparatus to communicate with the memory unit to
• generate motion compensation information and a quantized result of an error image representing a difference between a current image to be restored and a prediction image obtained by performing inter prediction on the current image by performing entropy decoding on a bitstream of the current image,
• receive at least one of the reference images from the memory unit by using the generated motion compensation information, and
• restore the current image based on the at least one received reference image and the quantized result,
• wherein the image decoding apparatus is configured to
• request the memory unit to transmit the at least one of the reference images by using the motion compensation information, and
• receive the at least one of the reference images from the memory unit while restoring a previous image.