VIDEO ENCODING METHOD WITH BIT DEPTH ADJUSTMENT FOR FIXED-POINT CONVERSION AND APPARATUS THEREFOR, AND VIDEO DECODING METHOD AND APPARATUS THEREFOR

摘要

Provided are a video encoding method of adjusting a range of encoded output data to adjust a bit depth during restoring of encoded samples, and a video decoding method of substantially preventing overflow from occurring in output data in operations of a decoding process. The video decoding method includes parsing and restoring quantized transformation coefficients in units of blocks of an image from a received bitstream, restoring transformation coefficients by performing inverse quantization on the quantized transformation coefficients, and restoring samples by performing one-dimensional (1D) inverse transformation and inverse scaling on the quantized transformation coefficients. At least one from among the transformation coefficients and the samples has a predetermined bit depth or less.

主权项

1. A method for decoding a video, the method comprising:
obtaining transformed coefficients of a block from a bitstream; generating inverse-quantized transformed coefficients by performing inverse-quantization and a first clipping on the transformed coefficients; generating sample values by performing vertical inverse-transformation and a second clipping on the inverse-quantized transformed coefficients; and generating residual values by performing horizontal inverse-transformation on the sample values, wherein the first clipping is performed for restricting the inverse-quantized transformed coefficients to a range of a first bitdepth, and the second clipping is performed for restricting the sample values to a range of a second bitdepth.