不知道这个词是从哪里学的。
原文：
This algorithm implements a hybrid of CDAF and PDAF, favouring PDAF. Whenever PDAF is available (and reports sufficiently high confidence), it is used for continuous feedback control of the lens position. When triggered in Auto mode, we enable the loop for a limited number of frames (it may terminate sooner if the phase becomes small). In CAF mode, the PDAF loop runs continuously. Very small lens movements are suppressed. When PDAF confidence is low (due e.g. to low contrast or extreme defocus) or PDAF data are absent, fall back to CDAF with a programmed scan pattern. A coarse and fine scan are performed, using the ISP's CDAF contrast FoM to estimate the lens position with peak contrast. (This is slower due to extra latency in the ISP, and requires a settling time between steps.) The scan may terminate early if PDAF recovers and allows the zero-phase lens position to be interpolated. In CAF mode, the fallback to a CDAF scan is triggered when PDAF fails to report high confidence and a configurable number of frames have elapsed since the last image change since either PDAF was working or a previous scan found peak contrast. Image changes are detected using both contrast and AWB statistics (within the AF window[s]). IR lighting can interfere with the correct operation of PDAF, so we optionally try to detect it (from AWB statistics).翻译
该算法结合了CDAF和PDAF，但更偏向于PDAF。 每当相位差自动对焦（PDAF）可用（且报告的置信度足够高）时，它就会被用于镜头位置的连续反馈控制。在自动模式下触发时，我们会启用该循环一定数量的帧数（如果相位变小，它可能会提前终止）。在连续自动对焦（CAF）模式下，相位差自动对焦循环会持续运行。非常小的镜头移动会被抑制。 当相位检测自动对焦（PDAF）的置信度较低（例如，由于对比度低或极度散焦）或PDAF数据缺失时，应使用预设的扫描模式回退到连续深度自动对焦（CDAF）。 使用ISP的CDAF对比度FoM进行粗略和精细扫描，以估计具有峰值对比度的镜头位置。（由于ISP中的额外延迟，此过程较慢，且步骤之间需要一定的稳定时间。）如果PDAF恢复并允许插值零相位镜头位置，扫描可能会提前终止。 在CAF模式下，当PDAF（相位检测自动对焦）无法报告高置信度，且自上次图像变化（无论是PDAF正常工作还是之前的扫描发现了峰值对比度）以来已过去可配置的帧数时，将触发向CDAF（连续深度自动对焦）扫描的回退。图像变化是通过对比度和自动白平衡（AWB）统计数据（在自动对焦窗口内）来检测的。 红外照明可能会干扰相位检测自动对焦（PDAF）的正常工作，因此我们选择尝试检测它（通过自动白平衡（AWB）统计数据）。
