point-clouds - Leap Motion 点云

Question

我们如何在 Leap Motion API 中访问点云？促使我购买它的一个功能是他们的宣传视频中的点云演示，但我似乎无法找到有关它的文档，而且论坛上的用户回复似乎参差不齐。我只是错过了什么吗？

我希望将 Leap Motion 用作一种廉价的 3D 扫描仪。

Answer 1

该演示显然是一个模型，它模拟了人手的 3D 模型，而不是实际的点云数据。您可以通过显示的点来判断，这些点由于障碍物而无法被传感器读取。

orion78fr 指向一个关于此的论坛帖子，但是 the transcript of an interview by the founders直接从来源提供更多信息:

1. Can you please allow access to cloud points in SDK?

David: So I think sometimes people have a misperception as to really how things work in our hardware. It’s very different from other things like the Kinect, and in normal device operation we have very different priorities than most other technologies. Our priority is precision, small movements, very low latency, very low CPU usage - so in order to do that we will often be making sacrifices that make what the device is doing completely not applicable to what I think you’re getting at, which is 3D scanning.

What we’re working on are sort of alternative device modes that will let you use it for those sorts of purposes, but that’s not what it was originally built for.You know, it’s our goal to let it be able to do those things and with the hardware can do many things. But our priority right now is of course human computer interaction, which we think is really the missing component in technology, and that’s our core passion.

Michael: We really believe in trying to squeeze every ounce of optimization and performance out of the devices for the purpose they were built. So in this case the Leap today is intended to be a great human computer interface. And we have made thousands of little optimizations along the way to make it better, that might sacrifice things in the process that might be useful for things like 3D scanning objects. But those are intentional decisions, but they don’t mean that we think 3D scanning isn’t exciting and isn’t a good use case. There will be other things we build as a company in the future, and other devices that might be able to do both or maybe there will be two different devices. One that is fully optimized for 3D scanning, and one that continues to be optimized and as great as it can be at tracking fingers and hands.

If we haven’t done a good job communicating that the device isn’t about 3D scanning or isn’t going to be able to 3D scan, that’s unfortunate and it’s a mistake on our part - but that’s something that we’ve had to sacrifice. The good news is that those sacrifices have made the main device really exceptional at tracking hands and fingers.

我已经使用 Leap Motion Controller 以及其他几个 3-D 扫描系统进行了开发，从我所看到的情况来看，我非常怀疑我们是否会从当前出货的硬件中获取点云数据。如果我们这样做，保真度将远低于我们从该设备看到的粗略手指和手部跟踪的保真度。

有一些低成本的 3D 扫描替代方案已经开始出现。 SoftKinetic 有他们的 DepthSense 325 camera 250 美元(实际上与 Creative Gesture Camera 相同，现在只有 150 美元)。 DS 325 是一款飞行时间红外相机，可为您提供前方 3D 空间的 320x240 点云图。在我的测试中，它适用于不透明的 Material ，但任何带有一点光泽或光泽的东西都会给它带来麻烦。

PrimeSense Carmine 1.09 (200 美元)使用结构光来获取它前面的点云数据，这是他们为原始 Kinect 提供的技术的进步。与 SoftKinetic 相机相比，它的有效空间分辨率较低，但它似乎提供的深度噪声更少，并且可以处理更多种类的 Material 。

DUO 也是一个很有前途的项目，可惜 its Kickstarter campaign failed .它使用来自 IR 源的立体成像从几个 PS3 Eye 相机返回点云。他们可能会在 future 某个时候重启该项目。

虽然 Leap 可能无法满足您的需求，但似乎越来越多的设备在消费者价格范围内推出以支持 3-D 扫描。