Apparatus and method for coding and decoding image

A video decoding apparatus, comprising:

• a parameter calculator configured to calculate a brightness compensation parameter based on one or more first pixels adjacent to a current block and one or more second pixels adjacent to a motion prediction block obtained by using a prediction motion vector, wherein the one or more second pixels are located in locations corresponding to the one or more first pixels;
• a target pixel selector configured to select one or more target pixels for a brightness compensation from pixels in a prediction block determined by a motion vector of the current block, by using one or more pixels adjacent to the motion prediction block;
• and
• a predictive decoder configured to generate a compensated prediction block of the prediction block by applying the brightness compensation parameter to the selected one or more target pixels and to perform a predictive decoding on the generated compensated prediction block.

A video encoding method, comprising:

• calculating a brightness compensation parameter based on one or more first pixels adjacent to a current block and one or more second pixels adjacent to a motion prediction block obtained by using a prediction motion vector, wherein the one or more second pixels are located in locations corresponding to the one or more first pixels;
• selecting one or more target pixels for a brightness compensation from pixels in a prediction block determined by a motion vector of the current block, by using one or more pixels adjacent to the motion prediction block;
• and
• generating a compensated prediction block of the prediction block by applying the brightness compensation parameter to the selected one or more target pixels and then performing a predictive encoding on the generated compensated prediction block.

A video decoding method, comprising:

• calculating a brightness compensation parameter based on one or more first pixels adjacent to a current block and one or more second pixels adjacent to a motion prediction block obtained by using a prediction motion vector, wherein the one or more second pixels are located in locations corresponding to the one or more first pixels;
• selecting one or more target pixels for a brightness compensation from pixels in a prediction block determined by a motion vector of the current block, by using one or more pixels adjacent to the motion prediction block;
• and
• generating a compensated prediction block of the prediction block by applying the brightness compensation parameter to the selected one or more target pixels and then performing a predictive decoding on the generated compensated prediction block.