图像和视频的实时频率调整,Computer Graphics Forum

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图像和视频的实时频率调整
Computer Graphics Forum ( IF 2.7 ) Pub Date : 2021-06-04 , DOI: 10.1111/cgf.142612
Rafael L. Germano ₁ , Manuel M. Oliveira ₁ , Eduardo S. L. Gastal ₁

Affiliation

我们提出了一种实时调整图像和视频中空间频率的技术。我们的方法允许减少和增加频率，并且与图像大小调整正交。因此，它可用于自动调整空间频率，以在图像缩小和放大期间保留结构化图案的外观。通过预先计算图像的空间频率分解及其展开的相位，这些操作可以实时执行，这要归功于我们对数字图像频率处理的新颖数学观点：通过瞬时频率和相位展开理论来解释问题。为了实现这一点，我们引入了一种算法，用于同时对几个无序频率分量进行相位解缠，它还处理实际信号的频率符号模糊性。因此，我们的方法为光谱重映射的概念提供了理论和实践上的改进，从而实现了实时性能和改进的颜色处理。我们在大量受频率调整的图像上证明了它的有效性。通过对与结构化图案相关的空间频率进行实时控制，我们的技术扩展了图像和视频处理的创意和技术可能性范围。

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Real-Time Frequency Adjustment of Images and Videos

We present a technique for real-time adjustment of spatial frequencies in images and videos. Our method allows for both decreasing and increasing of frequencies, and is orthogonal to image resizing. Thus, it can be used to automatically adjust spatial frequencies to preserve the appearance of structured patterns during image downscaling and upscaling. By pre-computing the image's space-frequency decomposition and its unwrapped phases, these operations can be performed in real time, thanks to our novel mathematical perspective on frequency manipulation of digital images: interpreting the problem through the theory of instantaneous frequencies and phase unwrapping. To make this possible, we introduce an algorithm for the simultaneous phase unwrapping of several unordered frequency components, which also deals with the frequency-sign ambiguity of real signals. As such, our method provides theoretical and practical improvements to the concept of spectral remapping, enabling real-time performance and improved color handling. We demonstrate its effectiveness on a large number of images subject to frequency adjustment. By providing real-time control over the spatial frequencies associated with structured patterns, our technique expands the range of creative and technical possibilities for image and video processing.

更新日期：2021-06-04

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