Patent Document ID: 20170180753
Application ID: 15449109
Patent Flag: 0

Claim One:
1. An apparatus of decoding a video using an inter prediction, the apparatus comprising: an information extractor configured to obtain a differential motion vector of a current block and encoded residual signals from a bitstream; a motion vector decoder configured to define a candidate set including a plurality of predicted motion vector candidates by deriving the plurality of predicted motion vector candidates from neighboring blocks of the current block, select a predicted motion vector of the current block from the plurality of predicted motion vector candidates included in the candidate set, and reconstruct a motion vector of the current block by adding the differential motion vector to the predicted motion vector; a motion compensator configured to generate predicted pixels by predicting pixels in the current block using the motion vector of the current block; a residual data decoder configured to reconstruct residual signals from the encoded residual signals; and an adder configured to add the predicted pixels and the reconstructed residual signals corresponding thereto, wherein the residual data decoder is configured to identify whether an inverse quantization and an inverse transform from a frequency domain into a spatial domain are applied to the encoded residual signals, and reconstruct the residual signals from the encoded residual signals by selecting, based on the identification of whether the inverse quantization and the inverse transform are applied, one of the following processes: skipping both the inverse quantization and the inverse transform from the frequency domain into the spatial domain, to reconstruct the residual signals directly from the encoded residual signals which are neither inversely quantized nor inversely transformed, inversely quantizing the encoded residual signals and skipping the inverse transform of the inversely quantized residual signals from the frequency domain into the spatial domain, to reconstruct the residual signals using the inversely quantized residual signals which are not inversely transformed, and inversely quantizing the encoded residual signals and then inversely transforming the inversely quantized residual signals from the frequency domain into the spatial domain, to reconstruct the residual signals using the inversely quantized and inversely transformed residual signals.