Videos often contain subtle motions and color variations that cannot be easily observed. Examples include, for instance, head motion and changes in skin face color due to blood flow controlled by the heart pumping rhythm. A few techniques have been developed to magnify these subtle signals. However, previous techniques were targeted specifically towards magnification of either motion or color variations. Trying to magnify both aspects applying two of these techniques in sequence does not produce good results. We present a method for magnifying subtle motions and color variations in videos, which can be performed either separately or simultaneously. Our approach is based on the Riesz pyramid, which was previously used only for motion magnification. Besides modifying the local phases of the coefficients of this pyramid, we show how altering its local amplitudes and its residue can be used to magnify intensity/color variations. We demonstrate the effectiveness of our technique in multiple videos by magnifying both subtle motion and color variations simultaneously.

视频通常包含不易观察到的细微动作和颜色变化。示例包括，例如，头部运动和由心脏泵血节律控制的血流引起的皮肤面部颜色变化。已经开发了一些技术来放大这些微妙的信号。然而，以前的技术专门针对运动或颜色变化的放大。试图依次应用其中的两种技术来放大这两个方面并不会产生好的结果。我们提出了一种放大视频中细微运动和颜色变化的方法，可以单独或同时执行。我们的方法基于 Riesz 金字塔，该金字塔以前仅用于运动放大。除了修改这个金字塔系数的局部相位，我们展示了如何改变其局部振幅及其残差可用于放大强度/颜色变化。我们通过同时放大微妙的运动和颜色变化来证明我们的技术在多个视频中的有效性。