Image encoding/decoding apparatus and method
Provided is an image encoding/decoding apparatus and method. The image encoding apparatus may include a motion vector prediction unit to perform a prediction with respect to an arbitrary motion vector of a current block within an image, using at least one of vector information of a motion vector corresponding to an adjacent block and vector information of a previous motion vector of the current block, and a differential determination unit to determine differential information of a motion vector of the current block based on the motion vector predicted in the motion vector prediction unit and an actual motion vector of the current block.
1. An image decoding method comprising:
generating a predicted motion vector of a current block within a current picture using at least one of motion vector information of an adjacent block of the current block within the current picture and motion vector information of a collocated block of the current block within a collocated picture;
obtaining differential motion vector information of the current block from bitstream; and
adding the predicted motion vector of the current block to the differential motion vector information of the current block to generate a motion vector of the current block,
wherein the generating the predicted motion vector of the current block comprises scaling the motion vector information of the adjacent block of the current block using a distance from a first reference picture referred to by the adjacent block of the current block to the current picture and a distance from a second reference picture referred to by the current block to the current picture, in response to the first reference picture referred to by the adjacent block of the current block being different from the second reference picture referred to by the current block,
wherein a location of the collocated block within the collocated picture corresponds to a location of the current block within the current picture, and
wherein the predicted motion vector of the current block is generated by applying a predetermined offset value to the scaled motion vector information.
2. An image encoding method comprising:
generating a predicted motion vector of a current block within a current picture using at least one of motion vector information of an adjacent block of the current block within the current picture and motion vector information of a collocated block of the current block within a collocated picture; and
encoding differential motion vector information of the current block, the differential motion vector information being generated by subtracting the predicted motion vector of the current block from a motion vector of the current block,
wherein the generating the predicted motion vector of the current block comprises scaling the motion vector information of the adjacent block of the current block using a distance from a first reference picture referred to by the adjacent block of the current block to the current picture and a distance from a second reference picture referred to by the current block to the current picture, in response to the first reference picture referred to by the adjacent block of the current block being different from the second reference picture referred to by the current block,
wherein a location of the collocated block within the collocated picture corresponds to a location of the current block within the current picture, and
wherein the predicted motion vector of the current block is generated by applying a predetermined offset value to the scaled motion vector information.
3. A non-transitory computer-readable recording medium storing encoded data which is received and decoded by an image decoding apparatus and used to reconstruct an image,
wherein the encoded data comprises information on a differential motion vector of a current block within a current picture and information on a predicted motion vector of the current block,
wherein the information on the differential motion vector of the current block is used to generate a differential motion vector of the current block,
wherein the information on the predicted motion vector of the current block is used to generate a predicted motion vector of the current block,
wherein the differential motion vector of the current block is used to generate a motion vector of the current block with the predicted motion vector of the current block,
wherein the predicted motion vector of the current block is generated by using at least one of motion vector information of an adjacent block of the current block within the current picture and motion vector information of a collocated block of the current block within a collocated picture,
wherein, when the predicted motion vector of the current block is generated, the motion vector information of the adjacent block of the current block is scaled using a distance from a first reference picture referred to by the adjacent block of the current block to the current picture and a distance from a second reference picture referred to by the current block to the current picture, in response to the first reference picture referred to by the adjacent block of the current block being different from the second reference picture referred to by the current block,
wherein a location of the collocated block within the collocated picture corresponds to a location of the current block within the current picture, and
wherein the predicted motion vector of the current block is generated by applying a predetermined offset value to the scaled motion vector information.