Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain first and second motion vectors of a block other than the current block. The other block neighbors the current block at one of a left, top and top right position. The decoder is configured to determine first and second motion vectors of the current block using the first and second motion vectors of the other block such that the first motion vector of the current block has a same direction as the first motion vector of the other block and the second motion vector of the current block has a same direction as the second motion vector of the other block.

Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain first and second motion vectors of a block other than the current block. The other block neighbors the current block at one of a left, top and top right position. The decoder is configured to determine first and second motion vectors of the current block using the first and second motion vectors of the other block such that the first motion vector of the current block has a same direction as the first motion vector of the other block and the second motion vector of the current block has a same direction as the second motion vector of the other block.

Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain first and second motion vectors and a reference picture index of a block other than the current block. The decoder is configured to obtain a direction of the first and second motion vectors. The decoder is configured to determine first and second prediction motion vectors of the current block using the first and second motion vectors of the other block such that the first prediction motion vector of the current block has the obtained direction of the first motion vector of the other block and the second prediction motion vector of the current block has the obtained direction of the second motion vector of the other block.

Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain first and second motion vectors of a block other than the current block. The other block neighbors the current block at one of a left, top and top right position. The decoder is configured to determine first and second motion vectors of the current block using the first and second motion vectors of the other block such that the first motion vector of the current block has a same direction as the first motion vector of the other block and the second motion vector of the current block has a same direction as the second motion vector of the other block.

Abstract: In one embodiment, the method includes obtaining first and second motion vectors and a reference picture index of a block other than the current block. First and second prediction motion vectors of the current block are determined using the first and second motion vectors of the other block such that the first prediction motion vector of the current block has the obtained direction of the first motion vector of the other block and the second prediction motion vector of the current block has the obtained direction of the second motion vector of the other block.

Abstract: In one embodiment, the method includes obtaining first and second motion vectors of a block other than the current block. The other block neighbors the current block at one of a left, top and top right position. First and second motion vectors of the current block are determined using the first and second motion vectors of the other block such that the first motion vector of the current block has a same direction as the first motion vector of the other block and the second motion vector of the current block has a same direction as the second motion vector of the other block.

Abstract: In one embodiment, the method includes obtaining first and second motion vectors of blocks other than the current block. The other blocks neighbor the current block at one of a left, top and top right position. A direction of the first and second motion vectors of the at least one neighboring block is obtained by a decoder. First and second prediction motion vectors of the current block are determined based on the obtained directions of the at least one neighboring block and by applying a median operation to the first motion vectors of the at least one neighboring block and applying a median operation to the second motion vectors of the at least one neighboring block.

Abstract: A method for calculating a prediction motion vector of a block to be coded, by performing a median operation using motion vectors of neighboring blocks. If one of the neighboring blocks has motion vectors MV1 and MV2, direction (forward or backward) information of reference pictures referred to, respectively, by the motion vectors are acquired and one of the motion vectors is selected with reference to the acquired direction information. Then, the median operation including the selected motion vector is performed to obtain the prediction motion vector of the block to be coded.

Abstract: In one embodiment, the apparatus includes a decoder. The decoder is configured to obtain first and second motion vectors of a block other than the current block. The other block neighbors the current block at one of a left, top and top right position. The decoder is configured to obtain a direction of the first and second motion vectors of the neighboring block. The decoder is configured to determine first and second prediction motion vectors of the current block using the first and second motion vectors of the neighboring block such that the first prediction motion vector of the current block has the obtained direction of the first motion vector of the neighboring block and the second prediction motion vector of the current block has the obtained direction of the second motion vector of the neighboring block.

Abstract: The method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. First motion vector information and second motion vector information for the macroblock is obtained and a first reference field picture index and a second reference field picture index associated with the macroblock is obtained. The method further includes selecting a first reference field picture having a same parity as the macroblock if the first reference field picture index is an even number, and selecting a second reference field picture having a different parity from the macroblock if the second reference field picture index is an odd number. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.

Abstract: In one embodiment, the method includes determining reference picture index numbers in a reference picture list. The reference picture index numbers increase for reference pictures having a decreasing display order with respect to a picture including the macroblock. The reference picture numbers increase for reference pictures having an increasing display order with respect to the picture including the macroblock, and the reference picture index numbers of the reference pictures have a decreasing display order are greater than the reference picture index numbers of the reference pictures having an increasing display order. Motion vector information is obtained for the current field macroblock. A field reference picture index associated with the current field macroblock is obtained. A frame reference picture is selected based on the frame reference picture index and the reference picture index number.

Abstract: In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively and determining a reference frame picture index based on display order information for the multiple reference frame pictures. A first reference field picture having a different parity from the macroblock is selected if the first reference field picture index is an odd number, and a second reference field picture having a same parity as the macroblock is selected if the second reference field picture index is an even number. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.

Abstract: In one embodiment, the method includes obtaining a reference frame picture list including multiple reference frame pictures and determining reference frame picture index of the multiple reference frame pictures in the reference frame picture list based on display order information for the multiple reference frame pictures. Motion vector information for the current field macroblock and a reference field picture index associated with the current field marcoblock are obtained. A reference field picture having a different parity from the current field macroblock is selected if the reference field picture index is an odd value. The current macroblock is decoded based on the motion vector information and the selected reference field picture.

Abstract: In one embodiment, the method includes obtaining a reference frame picture list including multiple reference frame pictures and determining reference frame picture index of the multiple reference frame pictures in the reference frame picture list based on display order information for the multiple reference frame pictures. The method further includes obtaining motion vector information for the current field macroblock and obtaining a reference field picture index associated with the current field macroblock. A reference field picture having a same parity as the current field macroblock is selected if the reference field picture index is an even value. The current macroblock is decoded based on the motion vector information and the selected reference field picture.

Abstract: In one embodiment, the method includes determining reference picture index numbers in a reference picture list. The reference picture index numbers increase for reference pictures having a decreasing display order with respect to a picture including the macroblock. The reference picture index numbers increase for reference pictures having an increasing display order with respect to the picture including the macroblock. The reference picture index numbers of the reference pictures having a decreasing display order are less than the reference picture index numbers of the reference pictures having an increasing display order.

Abstract: In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. The method further includes obtaining first motion vector information and second motion vector information for the macroblock and obtaining a first reference field picture index and a second reference field picture index associated with the macroblock. First and second reference frame pictures are determined. A first and second reference field pictures are selected. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.

Abstract: In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. The method further includes obtaining first motion vector information and second motion vector information for the macroblock and obtaining a first reference field picture index and a second reference field picture index associated with the macroblock. First and second reference frame pictures are determined. First and second reference field pictures are selected. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.

Abstract: In one embodiment, the method includes obtaining a reference picture list including multiple reference pictures, and determining an initial reference picture index of the multiple reference pictures in the reference picture list based on display order information for the multiple reference pictures. The initial reference picture index is selectively modified to produce a determined reference picture index based on the macroblock level of the macroblock. The determined reference picture index is the initial reference picture index if the macroblock level of the macroblock is a frame, and the determined reference picture index is the initial reference picture index divided by 2 if the macroblock level of the macroblock is a field. The macroblock is decoded by selecting at least one reference picture from the reference picture list using the determined reference picture index.

Abstract: In one embodiment, the method includes obtaining a first reference frame picture list and a second reference frame picture list including multiple reference frame pictures respectively. A reference frame picture index is determined based on display order information for the multiple reference frame pictures. The method further includes obtaining first motion vector information and second motion vector information for the macroblock and obtaining a first reference field picture index and a second reference field picture index associated with the macroblock. A first reference frame picture and a second reference frame picture are determined. The method further includes selecting first and second reference field pictures for the macroblock. The macroblock is decoded based on the first and second motion vector information and the selected first and second reference field pictures.

Abstract: In one embodiment, the method includes obtaining a reference picture list including multiple reference pictures, and determining an initial reference picture index of the multiple reference pictures in the reference picture list based on display order information for the multiple reference pictures. The reference picture index numbers increase for reference pictures having a decreasing display order with respect to a picture including the macroblock, and the reference picture numbers increase for reference pictures having an increasing display order with respect to the picture including the macroblock. The reference picture index numbers of the reference pictures having a decreasing display order are greater than the reference picture index numbers of the reference pictures having an increasing display order. The initial reference picture index is selectively modified to produce a determined reference picture index based on the macroblock level of the macroblock.