摘要
本文分三部分;也是三个步骤: Ⅰ.根据视差用计算机产生立体图对; Ⅱ.立体图对的空间频谱; Ⅲ.视差和空间频谱的关系。 得到一些结果: 1.具有视差的立体图对的空间频谱高峰有相对的位移。 2.移动的偏向和三维物体离观察者的远近有关,如果是一个单调变化的物体,则离人近的一侧频谱高峰向高频方向移,离人远的一侧向低频方向移。 3.移动的多少是和三维物体的平均深度变化率有关,变化率愈大移得愈多。 4.高峰的峰值则和三维物体的绝对深度有关。
It is a well-known fact that depth perception can produce binocular disparity but how is the disparity processed in the visual system is not yetclarified. The concept of spatial freqtiency originally established in physical opticsis now widely used in physiological and psychophysical studies in visionresearch. In order to investigate whether there is any relationship betweendisparity and spatial frequency spectrum, we used mathematical methods toapproach this problem and treated it in three steps: 1. A stereoscopic pair with disparity was made by computer. 2. Transformation of the stereoscopic pair into their spatial frequencyspectra by FFT on computer. 3. Comparison of the spectra of stereoscopic pairs having differentdisparities or different depth. The results are: 1. There are relative shifts in the position of peaks in spatial frequencyspectra of each of the stereoscopic pairs. 2. The direction of shifts depends on whether the side is close toproximal end or distal end of a three dimensional objt which is portrayed as a tilted line in the stereoscopic pair. If a line or curve monotonicallychanged in the depth dimension is observed then the peaks of the spectra ofstereoscopic pair close to the proximal end are shifted to the higherfrequency and those to the distal one are shifted to the lower frequency. 3. The degree of the relative shifts are proportional to the extent ofdisparity. The greater the disparity the further the peaks will shift. 4. There are some indications suggesting that the absolute depth of the3-D object is in someway related to the height of the peaks but not to therelative shifting.
出处
《心理学报》
1980年第2期195-204,共10页
Acta Psychologica Sinica
