Memory access window and padding for motion vector refinement

An apparatus for determination of a motion vector for a prediction block including a processing circuitry configured to:

• obtain an initial motion vector and a template for the prediction block;
• determine a refinement of the initial motion vector by template matching with the template in a search space, wherein:
• the search space is located on a position given by the initial motion vector, and
• the template matching:
• accesses integer sample positions within a predetermined memory access window, the predetermined memory access window including the search space,
• replaces at least one integer sample position located out of the predetermined memory access window by at least one replacement value, wherein each replacement value in the at least one replacement value is based on at least one integer sample position within the predetermined memory access window, and
• use values for the accessed integer sample positions as well as the at least one replacement value to perform the template matching.