i am Roger Li

Leap Motion SDK 十大題問

Leap Motion SDK 發佈在即,收到有關Leap Motion Team 的電郵,主題是: 「Top 10 SDK questions and answers「。
簡單翻譯一下該十大Leap Motion SDK 疑問,方便大家日後作參考。小弟能力有限,有錯請糾正 ^^」

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Hello,
Last week, we asked you to share your questions about the SDK through our Google Moderator. Thanks to everyone who participated, we had lots of great questions, so here are the top 10 answers voted by our community.
1. What is the minimum/maximum range the sensor can detect, and the field of vision?
// 感測器最大/最小的視野和可偵測範圍是多少?
The effective range and field of view of the Leap Motion Controller are expected to improve as the software matures. However, at this time it begins 2 centimeters above the device, and extends to roughly half a meter. The field of view is about 130° side-to-side and 100° front-to-back. You can think of the interaction area as an upside-down clipped pyramid, or frustum. This range is largely determined by the lenses we use, as well as ambient lighting and environmental conditions.
2. Which license will be used for the SDK? Will it be open source?
// SDK 使用哪一類別的許可證? 會是開源嗎?
The SDK has a proprietary license. Our SDK agreement allows you to use our tools to develop and distribute Leap Motion-enabled applications. We do have some restrictions around high-value applications, as well as applications that can control commercial and/or industrial or similar equipment. However, we think the license terms should cover 99% of typical applications.
3. What are the minimum and maximum frame rates and increments for raw positional data?
// 在原始位置資料增加的情況下, 最高的畫面更新率(帧率) 為多少?
The hardware and software operate at 60 frames per second in our highest-precision mode, and 240 frames per second in our highest-speed mode. When more hands or fingers are visible, the CPU usage and latency will increase; however, it will always remain below the limits of what is perceivable by the human eye.
4. What are the Leap Motion Controller’s limitations in detecting quick movements?
// 在物體高速移動的情況下,Leap Motion 控制器會有何限制?
Once tracking has begun on a hand or object, the Leap can keep up with any humanly possible speed. Even if a person moves at velocities greater than 5 meters per second, this is easily detectable by the Leap.
5. Will the Leap Motion be released with ARM compiled drivers?
// 會提供由ARM架構編譯的驅動器嗎?
We’re working on an ARM implementation of our processing pipeline, but at this point we have no ETA for when this will be available.
6. Does the API provide means for a calibration mode and/or background elimination?
// API 會提供如」校準模式」 或 「背景移除」 等功能嗎?
Our software automatically adapts to the environment in order to improve robustness – so that shelves, faces, and other background objects don’t interfere with tracking. We don’t plan to provide this as a controllable feature in the API, but we are open to suggestions. In the event that the device falls out of calibration, you’ll be able to use our re-calibration tool. In our experience, however, it’s rarely necessary to use this tool.
7. Does the raw positional API provide error estimates or resolution data along with frames?
// 原始位置資料的API 會提供有關幀的誤差估計或解像度等資料嗎? 
Resolution does vary and depends on the exact location within the field of view. However, even at the worst location within the field of view, the accuracy is still very high. For this reason, we do not currently report any error through the API.
8. Does the SDK support 3D collisions between objects and arbitrary space?
// SDK 支援物體和物體間的隨意空間的三維碰撞的判斷嗎?
No. The Leap Motion API includes attributes that describe the physical characteristics of a hand, finger, or tool – such as position, length, and width – as well as functions for calculating the distances in 3D space. It’s up to the application to decide what constitutes a collision.
9. Can the Leap Motion Controller work outside in the sun?
// Leap Motion 控制器可在陽光下運作嗎?
Using our software’s Robust Mode, the device and tracking will function just fine. However, if the sun is shining directly into the device, small areas with degraded tracking can occur.
10. If the Leap Motion Controller can be oriented any direction, how is this accounted for in the SDK?
// 如果 Leap Motion 控制器可作任何方向放置,可以說明多一些有關此情況在SDK中的資料嗎?
Currently, the API reports coordinates relative to the device itself. This means that if the device moves, the coordinate system moves along with it. We’ve also designed our software so that the z-axis – which is always perpendicular to the long dimension of the device – automatically orients its positive axis to point toward the user. As a result, if you put your hand into the field of view from the opposite side, the software will flip the z-axis. You can turn off this auto-orientation option from the Leap Motion Control Panel.
As always, we love to hear your thoughts as we get ready to open the Developer Portal. We’re continuing to put new tools into place that will allow you to build incredible apps for the Leap Motion Controller. We’re on the threshold of something amazing. Thanks again for being a part of this journey with us.
Warm regards,
The Leap Motion Team

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