Buying guide forbest document cameras
曾几何时，向现场观众展示文档的唯一选择是高架投影仪。必须专门为投影仪专门为透明纸张的投影仪创建文档。
今天，事情变得更加简单。您可以使用文档摄像头进行视觉演示。文档摄像头使您可以从一张纸上拍摄图像并实时显示。这为您的演示文稿提供了更大的灵活性，因为您可以选择的话，可以在最后一刻添加文档。
如果您在市场上购买文档摄像头，那么您来了。在BestRe百度必威下载views中，我们研究产品，并为读者提供详细的信息和购物指南，以帮助他们做出购买决策。我们从不接受制造商的免费样品，因此我们的选择和产品评论没有偏见。百度必威下载
If you're ready to buy, please consider one of our highlighted more. Please continue reading this shopping guide to learn more about document cameras, including which camera features would best meet your needs.
How a document camera works
A document camera works a bit like an overhead projector in that it projects an image onto a display screen. It can project anything printed on paper, in fact. But you aren’t limited to projecting images from a book or other pieces of paper. You can use a document camera almost like a webcam, shooting photos or video and projecting them onto a screen during your presentation.
Here are some key components of document cameras.
Arm:The arm connects the lens with the base of the document camera. Some document cameras have a flexible arm that makes it easy to adjust the lens quickly. Others have a rigid vertical arm; with this type, you slide the lens up and down to reposition it.
Image sensor:As with any type ofdigital camera，文档摄像头的图像传感器是良好图像质量的关键。分辨率以百万像素进行测量；更多的百万像素等于更清晰的图像。为了显示文本，大约五个百万像素的分辨率是足够的数字。必威体育娱乐app如果您需要显示照片或高分辨率图形，则更大的百万像素计数效果更好。
"Document cameras may need to have driver updates installed to work with certain displays."
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镜片：The document camera lens plays a crucial role in the quality of the display. A sharp lens allows you to dial in the focus, ensuring the document being displayed is easy to read on screen.
灯光:Many document cameras have LEDs near the lens that light up the document being displayed. Adequate lighting is an important part of a high-quality display.
Motherboard and internal components:The document camera contains chips and amotherboard,所有这些process the image signal. These components also pass the signal to the display device.
Ports:The base of the document camera has one or more ports. You use these ports to power the camera and to connect it to your display mechanism.
Storage:您可以使用文档摄像头创建幻灯片以提前进行演示。一些文档摄像机甚至包括存储图像文件的方法 - 如果您没有计算机方便的情况，这很好。带有存储属性的相机将包含一个存储卡插槽或用于拇指驱动器的USB存储端口。
Did you know?
一些文档相机包含一个灵活的鹅颈式design to adjust the lens. Others slide the lens up and down a rigid arm.
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Document camera display options
将文档摄像头连接到显示选项时，必须与显示设备建立直接的有线连接。因此，重要的是要找到一个与文档摄像机相同的显示屏。您的设备选项包括以下内容。
Projector
Connect your document camera to aprojector, and you can display your imagery on a wall or large screen. When giving a presentation in a large area, you’ll want to connect to a projector. Most projectors use HDMI or VGA input ports.
Computer screen
If you plan to swap back and forth between digital documents stored on the computer and paper documents shown by the document camera, connect to a computer. Alaptopdisplay or desktop computer monitor screen works better in a small room where you’re giving a presentation. You will typically use a USB connection with the computer.
Did you know?
如果您的文档摄像头连接到计算机，则应能够在文档摄像机和计算机之间来回切换，作为用于演示的输入设备。
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电视screen
For a medium-size room, a large screen电视在演讲中效果很好。您可以通过USB或HDMI输入电缆将文档摄像机直接连接到电视。
Document camera prices
You’ll find a few different price points available when shopping for document cameras. As with most tech devices, if you want more features, you’ll have to pay a bit extra for them.
Less than $75:Plenty of document cameras are available on the low end of the pricing spectrum. Most of these will have rigid vertical arms, so it will take a bit longer to adjust the position of the lens relative to the document. Low-price document cameras sometimes don’t include software or cabling, and the image resolution is likely to be limited. Be careful in this area of the market, as there are some hit-and-miss pieces of hardware available.
$75 to $200:中端文档摄像头会让大多数人满意。该分辨率往往是好的，并且大多数具有内置的LED来点亮文档。这些相机通常使用可用的软件和所需的电源线发货。大多数人具有柔性的鹅脑式臂，可让您快速轻松地调整镜头的位置。变焦功能或特写镜头附件也很常见。
超过200美元：Top-shelf document cameras offer top-shelf resolution. You get the sharp images you need for presentations involving photos and/or graphics. Many of these units are extremely small and lightweight, making them perfect for travel. Some high-end units include the ability to store images to a memory card USB thumb drive as well.
FAQ
Q. How are document cameras better than overhead projectors?
A.In the past, if you were giving a presentation with an overhead projector, you faced some limitations. The information had to be presented on a transparency sheet. You couldn’t use existing paper documents as you can with a document camera.
What’s more, an overhead projector required a darkened room, making subtle details more difficult to see. With a document camera, however, you can display paper documents on a screen. You also have the option of connecting to a high-resolution TV screen that can be seen even with lighting in the room.
Q. How can I create sharper images with my document camera?
A.If you notice a document looks blurry on the display, try moving the lens a bit farther from the surface of the document. Some document camera lenses have a focus ring. Some document cameras have a close-up lens attachment that you use when displaying small documents. However, if you’re viewing a large document with the close-up attachment affixed to the lens, the text may appear blurry. Dirty lenses can also cause a blurry text display.
“如果您的文本在屏幕上没有清楚地出现，请尝试放大文档或使用特写镜头附件。”
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Q. Can I capture and save images shot with my document camera?
A.Yes. If you’re using software or an app that allows you to insert images directly from ascanner或相机，您也可以从文档摄像机中插入图像。例如，如果您要在Microsoft PowerPoint中创建演示文稿，则可以将文档摄像机的捕获图像直接插入演示文稿中。
问：我可以用文档摄像机录制视频吗？
A.Yes, as long as you have a video-capture type of software installed on your computer. You just have to set up the video capture software to use the document camera as the input device. Some document cameras even ship with video capture software included.
