“Aliasing”(混叠)是信号处理中的一个重要概念,尤其在数字音频、图像处理和计算机图形学等领域。以下是对混叠的详细解释: 基础概念 混叠是指当一个连续信号被采样时,如果采样频率低于信号的最高频率的两倍(根据奈奎斯特-香农采样定理),则会出现高频成分的错误表示,这些错误表示会出现在采样后的信号的低频部分,导致原始...
Conceptually, anti -aliasingis performed by oversampling the image and resampling at the screen resolution. 从概念上说, 反走样通过对图像实行基于屏幕分辨率的过采样和再采样来实现. 互联网 Fortunately, in all modern digital gear,aliasingis so low in level that it's inaudible. ...
aliasing errorDenote by B 2 σ,p (1 < p < ∞) the bandlimited class p -integrable functions whose Fourier transform is supported in the interval [ σ, σ ]. It is shown that a function in B 2 σ,p can be reconstructed in L p () by its sampling sequences { f ( κπ / σ ...
1.Visible or audible distortion introduced into digital information, such as images or audio signals, caused when a continuous line or transition is not smoothly captured or represented because of the low resolution or sampling rate of a digital medium. ...
Our findings reveal a quantitative association between hard pixels and aliasing, which is distortion caused by the overlapping of frequency components in the Fourier domain during downsampling. To identify the frequencies responsible for aliasing, we propose using the equivalent sampling rate to calculate...
Aliasing is a kind ofSampling Artifact. Sampling isUbiquitousin Computer Graphics.采样时在自然界中普遍存在的,锯齿or走样是一种采样错误。 2.1 Sample 采样 Photograph = Sample Image Sensor Plane 在感光器获得光学信息后将其离散成一系列的图像上的像素的行为,即为采样 ...
in error, rather than detecting the desired center frequency of the input high frequency signal. In the case when aliasing occurs, the ADC will output a series of digital pulses that quantifies a signal with frequency equal to the difference between the sampling rate and the center frequency....
Super Sampling Anti-Aliasing (SSAA) The SSAA approach has been used in non-real-time applications. In this approach, a 512×512 image is first computed at higher resolution, such as 2048×2048, for example. It is then reduced through averaging or filtering to produce a 512×512 image. ...
How Can We Reduce Aliasing Error? Option 1: Increase sampling rate(增加采样率) Essentially increasing the distance between replicas in the Fourier domain Higher resolution displays, sensors, framebuffers But: costly & may need very high resolution ...
In Direct3Dbase.cpp, at the bottom of the CreateWindowSizeDependentResources method, add the following code to create the render target and render target view. Setting the desc.SampleDesc.Count to 4 is what causes the texture to be created with 4x multi-sampling. ...