ARCore 应用中的黑白视频流背景 [英] Black and white video stream background in ARCore app

问题描述

我正在开发 AR Android 应用程序，当我接近可渲染对象时，我想将 AR 视频流的颜色设为黑白，当然可渲染对象除外.我搜索了文档，但我无法访问视频流来执行此操作，如 探索 AR 交互(Google I/O '18).

I'm working on AR Android app and when I get close to a renderable I want to make the colors of the AR video stream black-and-white, except the renderables of course. I searched the docs but it seams I cannot access the video stream to do it as shown in Exploring AR interaction (Google I/O '18).

有谁知道如何做到这一点?

Does anyone know how to accomplish this?

推荐答案

要从 ARCore 获取视频流，需要将纹理绘制到正在捕获的 OpenGL 3.1 上下文 中.你可以找到 此处如何操作.

To get a video stream from ARCore requires drawing the texture into a OpenGL 3.1 Context what is being captured. You can find here how to do it.

捕获视频流后，最简单的方法是将彩色video/image 转换为灰度(红色的平均值)、绿色和蓝色)是使用零饱和度的 颜色矩阵.

After you've captured a video stream, the simplest way to convert colour video/image into grayscale one (the average of red, green, and blue) is to use a Colour Matrix with zero saturation.

以下是如何以编程方式执行此操作的 Java 代码摘录:

Here is an excerpt of Java code how to do it programmatically:

ColorMatrix BW_matrix = new ColorMatrix();
BW_matrix.setSaturation(0);

ColorMatrixColorFilter BW_filter = new ColorMatrixColorFilter(BW_matrix);
imageview.setColorFilter(BW_filter);

您只需要将其应用于来自手机摄像头的视频流，而不是将 Sceneform 的 3D 模型添加到场景后的渲染结果.

You need to apply it only to video stream from phone's camera, not to the rendered result after adding Sceneform's 3D models to the scene.

希望这会有所帮助.

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