Method and apparatus for coding/decoding image

An image decoding apparatus, comprising:

• a dequantization unit for deriving a scale factor for a current block depending on whether or not the current block is a transform skip block and performing scaling on the current block based on the scale factor,
• wherein the scale factor for the current block is derived based on a location of a transform coefficient within the current block, and
• the transform skip block is a block in which transform has not been applied to the current block and is specified based on information indicative of whether or not to apply inverse transform to the current block.

An image encoding apparatus, comprising:

• a quantization unit for deriving a scale factor for a current block depending on whether or not the current block is a transform skip block and performing scaling on the current block based on the scale factor,
• wherein the scale factor for the current block is derived based on a location of a transform coefficient within the current block, and
• the transform skip block is a block in which transform has not been applied to the current block and is specified based on information indicative of whether or not to apply inverse transform to the current block.