Method of estimating disparity vector using camera parameters, apparatus for encoding and decoding multi-view picture using the disparity vector estimation method, and computer-readable recording medium storing a program for executing the method

A multi-view picture encoding apparatus comprising:

• a multi-view picture input unit which receives multi-view pictures and a translation parameter;
• and
• an encoding unit which generates an encoded multi-view picture bit stream including the multi-view pictures and the translation parameter,
• wherein the encoding unit comprises a spatial direct mode performing unit which estimates a disparity using spatial direct mode estimation that calculates a disparity vector of a current viewpoint frame using a disparity vector between two frames having a different viewpoint from a current viewpoint and the translation parameter,
• the two frames having the different viewpoint from the current viewpoint are first and second viewpoint frames, and
• the disparity vector of the current viewpoint frame is dv2 which is calculated by the spatial direct mode performing unit using dv2=dv 1×cd2/cd1, where dv1 denotes the disparity vector between the two frames which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv2 denotes a disparity vector between the first block of the second viewpoint frame and a second block of the current viewpoint frame corresponding to the first block, and cd2/cd1 is a value corresponding to the translation parameter, or
• the disparity vector of the current viewpoint frame is dv4 which is calculated by the spatial direct mode performing unit using dv4=dv3×cd4/cd3, where dv3 denotes the disparity vector between the two frames, which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv4 denotes a disparity vector of the second viewpoint frame of a co-located second block of the current viewpoint frame of the first block, and cd4/cd3 is a value corresponding to the translation parameter.

A multi-view picture decoding apparatus comprising:

• an information confirming unit which receives an encoded multi-view picture bit stream and confirms information indicating a disparity vector estimation method included in the received multi-view picture bit stream;
• and
• a decoding unit which decodes the encoded multi-view picture based on the confirmed information,
• wherein the decoding unit comprises a spatial direct mode performing unit, if the confirmed information is spatial direct mode estimation, which calculates a disparity vector of a current viewpoint frame using a disparity vector between two frames having a different viewpoint from a current viewpoint and a translation parameter, and estimates a disparity,
• the two frames having the different viewpoint from the current viewpoint are first and second viewpoint frames, and
• the disparity vector of the current viewpoint frame is dv2 which is calculated by the spatial direct mode performing unit using dv2=dv 1×cd2/cd1, where dv1 denotes the disparity vector between the two frames which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv2 denotes a disparity vector between the first block of the second viewpoint frame and a second block of the current viewpoint frame corresponding to the first block, and cd2/cd1 is a value corresponding to the translation parameter, or
• the disparity vector of the current viewpoint frame is dv4 which is calculated by the spatial direct mode performing unit using dv4=dv3×cd4/cd3, where dv3 denotes the disparity vector between the two frames, which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv4 denotes a disparity vector of the second viewpoint frame of a co-located second block of the current viewpoint frame of the first block, and cd4/cd3 is a value corresponding to the translation parameter.

A non-transitory computer-readable recording medium having recorded thereon a program which when executed by a computer, causes the computer to execute a method of estimating a disparity vector of a multi-view picture, the method comprising:

• determining a disparity vector between two frames having a different viewpoint from a current viewpoint;
• and
• calculating a disparity vector of a current viewpoint frame using the disparity vector between the two frames and a translation parameter,
• wherein the two frames having the different viewpoint from the current viewpoint are a first viewpoint frame and a second viewpoint, and
• the disparity vector of the current viewpoint frame is dv2 which is calculated by the spatial direct mode performing unit using dv2=dv 1×cd2/cd1, where dv1 denotes the disparity vector between the two frames which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv2 denotes a disparity vector between the first block of the second viewpoint frame and a second block of the current viewpoint frame corresponding to the first block, and cd2/cd1 is a value corresponding to the translation parameter, or
• the disparity vector of the current viewpoint frame is dv4 which is calculated by the spatial direct mode performing unit using dv4=dv3×cd4/cd3, where dv3 denotes the disparity vector between the two frames, which is calculated using a certain block of the first viewpoint frame and a first block of the second viewpoint frame corresponding to the certain block, dv4 denotes a disparity vector of the second viewpoint frame of a co-located second block of the current viewpoint frame of the first block, and cd4/cd3 is a value corresponding to the translation parameter.