CAJ | 학술논문

为了降低现有任意视点电视系统中深度数据量化所带来的量化失真,提出一种自适应非均匀深度量化方法.首先根据深度数据的统计特性,选取有效深度子空间;然后对有效深度子空间重新进行精细划分,得到对应的自适应量化表;最后使用该自适应量化表对原深度数据进行自适应量化.实验结果表明,与现有的均匀量化和普通非均匀量化方法相比,使用所提出的方法可使深度数据的量化信噪比平均提高20 dB.因此,自适应非均匀量化方法能够显著降低深度数据量化误差,有助于在任意视点电视系统的接收端获得高精度深度数据,从而得到主观效果更好的虚拟视图.
위료강저현유임의시점전시계통중심도수거양화소대래적양화실진,제출일충자괄응비균균심도양화방법.수선근거심도수거적통계특성,선취유효심도자공간;연후대유효심도자공간중신진행정세화분,득도대응적자괄응양화표;최후사용해자괄응양화표대원심도수거진행자괄응양화.실험결과표명,여현유적균균양화화보통비균균양화방법상비,사용소제출적방법가사심도수거적양화신조비평균제고20 dB.인차,자괄응비균균양화방법능구현저강저심도수거양화오차,유조우재임의시점전시계통적접수단획득고정도심도수거,종이득도주관효과경호적허의시도.
An adaptive non-uniform quantization method is proposed to reduce the distortion due to the depth data quantization in free-viewpoint television (FTV) system using the ordinary non-uniform quantization method. The proposed method determines the valid depth sub-spaces ac-cording to the statistical distribution characteristics of the depth data. Then, these depth sub-spaces are finely divided to form an adaptive quantization look-table. Finally, the original depth data are adaptively quantized using the quantization look-table. Experimental results and compari-sons with the ordinary non-uniform depth data quantization method show that the proposed meth-od improves the quantization signal-to-noise ratio of the depth data by an average of 20 dB. Thus the adaptive non-uniform quantization method can significantly reduce the quantization distortion of the depth data, and benefits the high-accurate reconstruction of the depth data and the better subject visual effect of the synthesized image at the receiver of the FTV system.