iPhone:实时视频颜色信息，焦距，光圈? [英] iPhone: Real-time video color info, focal length, aperture?

问题描述

是否可以使用AVFoundation和CoreVideo实时获取颜色信息，光圈和焦距值?

Is there any way using AVFoundation and CoreVideo to get color info, aperture and focal length values in real-time?

让我解释一下.假设我在拍摄视频时想在屏幕的一小部分采样颜色并将其以RGB值输出到屏幕吗?另外，我想展示一下当前的光圈设置为什么.

Let me explain. Say when I am shooting video I want to sample the color in a small portion of the screen and output that in RGB values to the screen? Also, I would like to show what the current aperture is set at.

有人知道是否有可能收集这些值?目前，我只看到静止图像可以做到这一点.

Does anyone know if it is possible to gather these values? Currently I have only seen that this is possible with still images.

想法?

推荐答案

AVCaptureStillImageOutput将为您提供视频流的实时静止图像，包括焦距，光圈等exif数据.您可以从该位图计算自己的颜色信息.

AVCaptureStillImageOutput will get you a real time still from the video stream, including exif data for focal length, aperture, etc. Color info you could calculate yourself from that bitmap.

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