视频信号的采集

今天给大家介绍一个简单方便使用的视频信号的采集器

VGA到USB信号转换器

这是一个比手机还小巧的盒子。 它可以把你想要的VGA模拟信号转换成USB的数字信号输出到终端设备。 象Windows ，Macintosh OSX，Unix 等主机上。 是一个嵌入式的系统。 还适合在医疗器械， 科学实验等设备上。

 

这个小巧的VGA2USB不需要外接电源。只要在主机上安装驱动程序，插上就可以方便使用。

只要是VGA 信号，它都能捕捉到并保存到你的硬盘里。 对于一个软件产品介绍和演示很好。 也可给你事后分析提供数据。

• 
  
  
  

应用实例：

1．    接到电视机上的VGA输出口。 可以保存你感兴趣的电视节目的视频。

2．    对于很多系统管里员来说， 只要你有笔机本电脑。 你的笔机本电脑就可以成为其它主机的显示器用。 当你在安装服务器时，省去一时因找不到显示器而烦恼。

3．    如果你的医疗器械， 科学实验等设备上想集成我们的产品。请与我们直接联系。

应用程序及驱动下载：

For windows98, 2000, XP 

文件:	vga2usb-3.2.10.0000.zip
大小:	3961KB
下载:	下载

技术参数

Interface

USB 2.0

Dimensions

80 mm x 54 mm x 23 mm

3.15" x 2.125" x 0.91"

Connectors

One VGA D type connector

One USB mini B type connector

Maximum Sample Rate

230 Mpixels per second

Color Resolution

16 bits per pixel / 5:6:5 format

Supported Video Modes

720x400 at 70, 85Hz
640x480 at 60, 70, 72, 75, 85Hz
800x600 at 56, 60, 70, 72, 75, 85Hz
1024x768 at 60, 70, 72, 75, 85Hz
1152x864 at 60, 70, 75, 85Hz
1152x900 at 66, 76Hz
1280x960 at 60, 85Hz
1280x1024 at 60, 70, 75, 85Hz
1600x1200 at 60, 65, 70, 75, 85Hz
1920x1200 at 60, 70, 72, 75, 85Hz
2048x1536 at 60, 70, 72, 75, 85Hz

Update Rate

While results are typically around 10 updates per second, here are actual results under varying conditions:

Resolution	Win XP FPS 1
640 x 480	28.0
800 x 600	20.6
1024 x 768	10.0
1280 x 1024	5.6
1600 x 1200	4.3
1920 x 1200	3.1
2048 x 1536	2.0

Video Format Options

RGB plus HSync and VSync (5 wire).

LEDs

Three LEDs to indicate the status of the VGA2USB (power, readiness, and operation in progress)

Operating System Support

Linux (x86, amd64), Windows 2000, Windows XP, Windows Vista (x86, amd64), Mac OS X.

1 - Intel P4 3.0GHz FSB 800

产品包装

The VGA2USB product ships with the five (5) items shown above: 1. VGA2USB box 2. USB "A" Plug to USB Mini "B" Plug 5 pins cable 3. Male to male VGA adapter (gender changer) 4. VGA splitter 5. VGA cable.

 

 

常见问题

 

No. VGA2USB transfers substantial amounts of data for each captured frame. As USB 1.x buses are very slow (12Mb/s), they do not provide sufficient bandwidth for VGA2USB. USB 2.0 buses have a much higher transfer rate (480Mb/s), allowing VGA2USB to acquire and transfer several frames per second.

Please use to verify that your system has USB 2.0.

It depends on the resolution of your screen, the screen refresh rate, your operating system and the speed of the computer that is acquiring the images. Typical results are between 28 and 2 frames per second.

4. Does VGA2USB reduce the resolution of the images it captures in order to transfer it over the USB bus?

No. VGA2USB captures and transfers every pixel of the original VGA frame in 16-bit per-pixel RGB format. In this respect, VGA2USB provides better quality than a VGA-to-video converter paired with a Composite or S-Video grabber. You can see comparisons of screen shots taken with VGA2USB .

No. Unfortunately, some of those systems have very poor support or no support at all for the USB 2.0 bus.

Please contact us. We are always looking for ways to improve our system and may be willing to add support for this mode.

Although we provide a Linux SDK (API for driver and examples), we do not provide source code for the driver itself. Please contact us if you need a driver compiled for a specific kernel version or kernel setting.

Yes, the VGA2USB application has the ability to save captured signals as an AVI file.

The choice of codec and codec settings depend on the requirements for the quality of the AVI. You may need to try several codecs with different settings to see which codec best fits your task. We suggest using the Indeo 5.10 codec with 50% quality settings for a good compromise between compression rate, image quality and required CPU power.

VGA2USB has an automatic algorithm that crops visible images from the VGA frame. The algorithm may make a mistake, however, and be off by a few pixels. Please use the procedure described in this image to correct cropping.

11. Can I connect two or more VGA2USB devices to one computer and capture signals simultaneously? What is the resulting rate of capture for each VGA2USB?

Yes you can connect two or more VGA2USB devices and capture multiple signals simultaneously. You will need to run the VGA2USB application for each VGA2USB device attached. You will, however, notice a significant difference in frame rate for each additional active VGA2USB. The higher the performance of your computer, the better the possible frame rate. Our internal testing on a Dell Dimension 2400 (Celeron 2.4GHz processor, 512mb RAM) at 1024x768 with two VGA2USB devices yielded average frame rates of 7.1 fps and 4 fps. In contrast, a Pentium 4, 3.0Ghz desktop with 512MB of RAM at 1024 x 768 yielded average frame rates of 9.52 fps and 5.85 fps. Please note that you must start the VGA2USB application after connecting each VGA2USB.

 

 

Finally, there's a simple and affordable answer to every network administrator's biggest annoyance: finding and lugging around "crash carts" with a monitor, keyboard and mouse to administer servers and other headless machines. Epiphan Systems' KVM2USB product is a compact device that conveys the VGA stream from any host computer to a laptop, while emulating the laptop's keyboard and mouse outputs.

KVM2USB is a truly portable crash cart. Now, all you need to take with you on administrative site visits is your laptop, the KVM2USB device (roughly the size of a box of paperclips) and the accompanying cable.

KVM2USB works with virtually any computerized machine or embedded system, including:

• Windows, Macintosh, Unix computers and servers
• Medical devices, scientific and lab equipment
• ATM machines
• Slot machines and VLTs

The product provides a simple, lightweight and rapid means of conveying VGA images from host machines to a laptop and simulating the laptop's keyboard and mouse outputs. This allows administrators and technicians to quickly and easily connect to - and administer - headless machines without hassles.

As a compact external device, KVM2USB is easy to use and to transport. About the size of a box of paperclips, it is easily plugged in and requires no additional power so you don't have to locate a spare electrical outlet onsite.

The product ships complete with all required hardware and cabling. Software development kits are also available for specialized applications