Document Cameras are real-time image capture devices for displaying object to a larger audience. They are in essence, high resolution web cams, mounted on arms so as to facilitate their placement over a page. This allows a teacher to display a three-dimensional object or write on a non-transparent sheet of paper while the class observes.
Document cameras are typically used in classrooms and connected to LCD (or DLP) projectors with VGA cables (like a computer monitor). Most document cameras can also send a video signal to a computer via USB cable.
Many portable document cameras incorporate a flexible gooseneck design for ease of use, and some manufacturers periodically increase image resolution to keep up with the High-Definition display technology. High-Definition document cameras include an HDMI output port.
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Pixels
Resolution
Zoom
Frame Rate
Capture Area
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What are Document Cameras ?
The most economical document cameras in 2008 capture XGA resolution images of 1024 x 768 pixels, which yields 786,000 pixels. Document cameras that capture SXGA images, or super extended graphics array, which equates to a resolution of 1280 x 1024 pixels. SXGA images have 66% more pixels than XGA images of the same size, which means the pixels are smaller and provide sharper detail. UXGA is considered High-Resolution and equates to 1920 x 1080 pixels.
The most economical document cameras in 2008 capture XGA resolution images of 1024 x 768 pixels, which yields 786,000 pixels. Document cameras that capture SXGA images, or super extended graphics array, which equates to a resolution of 1280 x 1024 pixels. SXGA images have 66% more pixels than XGA images of the same size, which means the pixels are smaller and provide sharper detail. UXGA is considered High-Resolution and equates to 1920 x 1080 pixels.
Zoom and Auto-focus FunctionsThe document camera has a Zoom function which enables you to enlarge or decrease objects in size on the screen. It also has an Auto-focus funtion that focuses objects automatically. Users are free from the hassles and concentrate on their presentations.
The 5.2X optical zoom captures crisp and detailed images. Get even closer in combination with the 8.0X Digital zoom to enlarge minute features up to 41.6X. What's more, the Auto Focus function ensures that the details of objects of L1-n/TT-02s' 11"x17"(A3 size) shooting area remain sharp.
The document camera has a Zoom function which enables you to enlarge or decrease objects in size on the screen. It also has an Auto-focus funtion that focuses objects automatically. Users are free from the hassles and concentrate on their presentations.
The 5.2X optical zoom captures crisp and detailed images. Get even closer in combination with the 8.0X Digital zoom to enlarge minute features up to 41.6X. What's more, the Auto Focus function ensures that the details of objects of L1-n/TT-02s' 11"x17"(A3 size) shooting area remain sharp.
The 5.2X optical zoom captures crisp and detailed images. Get even closer in combination with the 8.0X Digital zoom to enlarge minute features up to 41.6X. What's more, the Auto Focus function ensures that the details of objects of L1-n/TT-02s' 11"x17"(A3 size) shooting area remain sharp.
SD Memory Card-Ready with CameraThe document camera enables you to record the images captured by it on a SD Memory Card. The pictures, teaching materials, the images of a clock, ruler etc, you project with the document camera, you can save and record them on a SD Memory Card for future use. PC mages files can be also stored on the SD Memory Card. And, the images on the SD Memory Card can be easily transferred back to a PC via a USB cable. You can also go back and forth with the images of live objects and the images stored on a SD Memory Card in a touch of button on its control panel.
The document camera enables you to record the images captured by it on a SD Memory Card. The pictures, teaching materials, the images of a clock, ruler etc, you project with the document camera, you can save and record them on a SD Memory Card for future use. PC mages files can be also stored on the SD Memory Card. And, the images on the SD Memory Card can be easily transferred back to a PC via a USB cable. You can also go back and forth with the images of live objects and the images stored on a SD Memory Card in a touch of button on its control panel.
Easy ConnectionsEnjoy the easy connections of the document camera with a PC, a projector , a video monitor, an Interactive white board. Its versatile input/output connections free you from headache over connectabilities.
Enjoy the easy connections of the document camera with a PC, a projector , a video monitor, an Interactive white board. Its versatile input/output connections free you from headache over connectabilities.
Other Advance FeaturesSome document cameras also come with advanced features such as:Wireless Remote Control One-touch freeze function for seamless transitions between document changes Onscreen display menus for easy control of the unit Multiple inputs for seamless transitions between two applications Built-in USB and RS-232 interfaces
Some document cameras also come with advanced features such as:Wireless Remote Control One-touch freeze function for seamless transitions between document changes Onscreen display menus for easy control of the unit Multiple inputs for seamless transitions between two applications Built-in USB and RS-232 interfaces
Choosing a Visual Presenter
A visual presenter is a color video camera mounted on a movable arm that is positioned over a large base on which objects can be placed. The base, called the stage, usually has side and bottom lights to illuminate the objects such as books, solid objects, or transparencies.
The camera has a lens that lets the user obtain an image of the entire object or it can zoom in for close up views to see very small areas. For objects such as an insect like a fly, the detailed body down to its individual hairs can be seen. Or when viewing a printed picture from a magazine the individual ink dots can be seen at a high zoom magnification.
The camera has a lens that lets the user obtain an image of the entire object or it can zoom in for close up views to see very small areas. For objects such as an insect like a fly, the detailed body down to its individual hairs can be seen. Or when viewing a printed picture from a magazine the individual ink dots can be seen at a high zoom magnification.
Visual presenters are now found in two different general types: analog and digital. An analog visual presenter uses a small video camera that produces NTSC video image format, the same video signal that comes out of the back of a standard VCR. This means that the images coming from an analog visual presenter can be input into a VCR, a function few people are aware of, and thus few people take advantage of this ability to record the visual presenter images on inexpensive VHS tape.
Analog visual presenters, up until recently, have been much more affordable than digital ones. With the price of the CCD camera chips that capture images digitally plummeting in price, along with inexpensive computer memory and other microchip-based products, digital visual presenters are now priced on an almost even level with analog visual presenter. Digital visual presenters use the same technology as a hand held digital camera, and produce a computer compatible signal.
Many digital visual presenters can plug directly into a data/video projector using the data signal port. In most cases the resolution of the image is 2 to 4 times better than that of the normal TV image produced by an analog presenter. Such a resolution increase is a major advantage since with an XGA resolution of 1024 x 768, it is nearly possible to image a full 8-1/2 by 11 inch sheet and read all the text. This is also important when it is necessary to resolve the detail on certain objects.
Some digital visual presenters can be connected to a computer. Here the image obtained by the presenter is sent to the computer, processed, and appears on the computer’s monitor or a laptop’s LCD. This same image can also be transmitted to a projector for display on a large screen.
Another advantage of the digital visual presenter is that it will permit the capture of images in a computer based digital format. A connected computer can then save a file of the subject or item placed in the viewing area. The digital visual presenter is, in a sense, a scanner, since it can capture live images at high resolution to a computer file.
Some digital visual presenters can even capture and store many images internally without a computer. These images can be later recalled and used to compare with live images or for describing a process.
When combined with a computer, a rapid series of images forming a short movie can also recorded.
Finally, another option is the need to show transparent media such as viewgraphs or 35 mm slides. Many visual presenters have lights below the stage. This allows transparencies that may have originally been created for an overhead projector to be easily viewed. Some have special holders for 35 mm slides and permit them to be viewed as a full screen image.
Analog visual presenters, up until recently, have been much more affordable than digital ones. With the price of the CCD camera chips that capture images digitally plummeting in price, along with inexpensive computer memory and other microchip-based products, digital visual presenters are now priced on an almost even level with analog visual presenter. Digital visual presenters use the same technology as a hand held digital camera, and produce a computer compatible signal.
Many digital visual presenters can plug directly into a data/video projector using the data signal port. In most cases the resolution of the image is 2 to 4 times better than that of the normal TV image produced by an analog presenter. Such a resolution increase is a major advantage since with an XGA resolution of 1024 x 768, it is nearly possible to image a full 8-1/2 by 11 inch sheet and read all the text. This is also important when it is necessary to resolve the detail on certain objects.
Some digital visual presenters can be connected to a computer. Here the image obtained by the presenter is sent to the computer, processed, and appears on the computer’s monitor or a laptop’s LCD. This same image can also be transmitted to a projector for display on a large screen.
Another advantage of the digital visual presenter is that it will permit the capture of images in a computer based digital format. A connected computer can then save a file of the subject or item placed in the viewing area. The digital visual presenter is, in a sense, a scanner, since it can capture live images at high resolution to a computer file.
Some digital visual presenters can even capture and store many images internally without a computer. These images can be later recalled and used to compare with live images or for describing a process.
When combined with a computer, a rapid series of images forming a short movie can also recorded.
Finally, another option is the need to show transparent media such as viewgraphs or 35 mm slides. Many visual presenters have lights below the stage. This allows transparencies that may have originally been created for an overhead projector to be easily viewed. Some have special holders for 35 mm slides and permit them to be viewed as a full screen image.
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