是目前AF的主流技术,相对于传统的Contrast AF(反差对焦),PDAF具有对焦速度快,拉伸幅度小的优点,下面来讲讲PDAF的工作原理和计算方法。 先来聊个有意思的话题,PDAF(Phase Detection Autofocus)相位检测对焦,为什么叫做相位检测? 看一个我们非常熟悉的函数,正弦函数和余弦函数, y = sin(x) y = cos(x) = sin(x...
A simple model of the phase-detection autofocus device based on the partially masked sensor pixels is described. The cross-correlation function of the half-images registered by the masked pixels is proposed as a focus function. It is shown that—in such setting—focusing is equivalent to ...
Wachel, "A Simple Model for On-Sensor Phase-Detection Autofocusing Algorithm," J. Comput. Commun. 1, 11-17 (2013).P. Sliwinski and P. Wachel. A simple model for on-sensor phase-detection autofocus- ing algorithm. Journal of Computer and Communications, 1(6):11-17, November 2013....
Keywords: Fourier ptychography and single-photon detection etc. Bahram Javidi (University of Connecticut) Keywords: holography etc. Rongguang Liang (The University of Arizona) Keywords: phase imaging, phase unwrapping and biomedical imaging etc. Christopher Metzler (The University of Maryland) Keywords: ...
In in-line holography, where the object beam and the reference beam are along the same optical axis, four-step phase-shifting algorithm is commonly used for phase recovery (Fig.3)25. At first, the complex field of the object wave at the sensor plane is calculated from the four phase-shif...
alongside 4′,6-diamidino-2-phenylindole (DAPI) as nuclear stain (Fig.3c). For mIF imaging we employed co-detection by indexing (CODEX®), a well-established technology for profiling the tumor microenvironment of different tumor types including GBM36,37. Following image raw data processing, ...
And then,the strip phase gradient autofocus(PGA) algorithm is ameliorated. 首先建立了适合机载UWB SAR成像几何的相位误差模型,并分析了其特点;然后针对模型特点,对条带式相位梯度自聚焦算法作出改进,同时提出一种基于空不变因子估计的加权相位梯度自聚焦算法。 3. A new phase gradient autofocus(PGA) algorithm...
Phase autofocus algorithmPGA algorithmThe phase gradient autofocus algorithm (PGA) is widely used in radar imaging due to its ability to achieve high accuracy estimation of phase error. However, in inverse synthetic aperture radar (ISAR) imaging, the target usually occupies continuous range bins and...
A phase detection autofocus (PDAF) algorithm iteratively estimates the phase shift between the left and right phase images captured in an autofocus process and uses it to determine the lens movement until the estimated in-focus lens position is reached. Such phase images have been assumed to be ...
The Phase Gradient Autofocus(PGA) algorithm can remove the high order phase error effectively,which is of great significance to get high resolution images in real-time processing. While PGA usually needs iteration, which necessitates long working hours. In addition, the performances of the algorithm...