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    • 8. 发明授权
    • Method to increase the accuracy of phase correlation motion estimation in low-bit-precision circumstances
    • 在低位精度情况下提高相位运动估计精度的方法
    • US08896759B2
    • 2014-11-25
    • US12912536
    • 2010-10-26
    • Mark RobertsonMing-Chang LiuYoshihiro MurakamiToru KurataYutaka Yoneda
    • Mark RobertsonMing-Chang LiuYoshihiro MurakamiToru KurataYutaka Yoneda
    • H04N5/14G06T7/20
    • H04N5/145G06T7/262G06T2207/20021G06T2207/20056
    • A method and system to improve the performance of phase correlation motion estimation for low-bit-precision implementation are described herein. Phase correlation uses the Fast Fourier Transform (FFT) with operations with infinite-precision constants. Since physical implementations use finite-precision arithmetic, there is some loss in precision relative to the ideal infinite-precision case. In low-complexity implementations, it is desirable to use as few bits as possible, and if the precision is too low, the performance of traditional phase correlation suffers. A pre-processing technique is applied to the data prior to taking the FFT, which minimizes the negative effects of finite precision in the FFT and allows high quality results from phase correlation. The pre-processing step is a content-dependent contrast adjustment that maps the range of the input images' pixel values to the range of input values for the FFT. There is no post-processing required after the FFT to compensate for the pre-processing step.
    • 本文描述了一种用于提高低位精度实现的相位运动估计性能的方法和系统。 相位相关使用具有无限精度常数的运算的快速傅里叶变换(FFT)。 由于物理实现使用有限精度算术,相对于理想的无限精度情况,精度有一定的损失。 在低复杂度实现中,期望尽可能少地使用位,如果精度太低,则传统相位相关的性能受损。 在采用FFT之前,将预处理技术应用于数据,这最小化了FFT中有限精度的负面影响,并允许相位相关的高质量结果。 预处理步骤是内容相关的对比度调整,其将输入图像的像素值的范围映射到用于FFT的输入值的范围。 在FFT之后不需要后处理来补偿预处理步骤。