Fiorentini Adriana, Maffei Lamberto, Sandini Giulio
Istituto di Neurofisiologia del CNR, 56100 Pisa, Italy.
Perception. 2013;42(11):1151-7. doi: 10.1068/p120195n.
The relevance of low and high spatial-frequency information for the recognition of photographs of faces has been investigated by testing recognition of faces that have been either low-pass (LP) or high-pass (HP) filtered in the spatial-frequency domain. The highest resolvable spatial frequency was set at 15 cycles per face width (cycles fw(-1)). Recognition was much less accurate for images that contained only the low spatial frequencies (up to 5 cycles fw(-1)) than for images that contained only spatial frequencies higher than 5 cycles fw(-1). For faces HP filtered above 8 cycles fw(-1), recognition was almost as accurate as for faces LP filtered below 8 cycles fw(-1), although the energy content of the latter greatly exceeded that of the former. These findings show that information conveyed by the higher spatial frequencies is not redundant. Rather, it is sufficient by itself to ensure recognition.
通过测试在空间频率域中经过低通（LP）或高通（HP）滤波的面部照片的识别情况，研究了低空间频率信息和高空间频率信息对于面部照片识别的相关性。最高可分辨空间频率设定为每面部宽度15周（周/面部宽度^(-1)）。对于仅包含低空间频率（高达5周/面部宽度^(-1)）的图像，识别准确率远低于仅包含高于5周/面部宽度^(-1)空间频率的图像。对于在8周/面部宽度^(-1)以上进行高通滤波的面部，识别准确率几乎与在8周/面部宽度^(-1)以下进行低通滤波的面部相同，尽管后者的能量含量大大超过前者。这些发现表明，较高空间频率传达的信息并非冗余。相反，其本身就足以确保识别。
