Motion picture encoding apparatus and method thereof

A method of encoding a video with a video encoding apparatus, comprising:

• obtaining a prediction image relating to a current block based on prediction mode information relating to the current block, the prediction mode information indicating an intra mode or an inter mode;
• determining whether the current block is a first block with a size that is not a minimum size (4×4) or a second block with a size that is a minimum size (4×4);
• when the current block is the second block, encoding, into a bitstream, information indicating whether the current block is inverse-transformed or not, wherein the information is not signaled for the first block and is signaled for the second block;
• performing a dequantization on residual coefficients relating to the current block;
• obtaining a residual image by performing, based on the information indicating whether the current block is inverse-transformed or not, an inverse-transform on dequantized residual coefficients;
• generating a reconstruction image using the residual image and the prediction image.