Technology Showcase:
Document Cameras

Mar 1, 2006 12:00 PM, By Bennett Liles

Advances in documentation presentation.

Samsung SDP-6500

Long gone are the days when the only method for classroom or conference document presentation was an overhead projector. The presenter rolled it out to display a printed page or transparency through the grit and grime that had collected on it since its last foray from a dusty closet. Operation was simple and options were few. The user positioned the page, pointed the mirror arm at the wall, hit the switch, and hoped the lamp came on.

For rock-bottom budgets, the overhead projector continued to serve. Even as the first analog document cameras emerged, some users actually preferred the vintage reflector machines for sharpness, clarity, and familiar operation. However, the analog models quickly improved, and now digital technology has boosted image sharpness and the range of available features to a new plateau, allowing document presentation to take its place among modern applications in classroom instruction, distance learning, telemedicine, 3D imaging, and videoconferencing.

Rapid drops in the price of camera chips, microprocessors, and computer memory have brought these digital features to the masses. Modern communication advances and applications have also spawned a new variety in document presentation mechanics.

The largest group of these devices still includes the traditional integrated platform (or “stage”) for printed pages or transparencies, along with two lighting modes. Fluorescent lamps on folding arms light opaque material or 3D objects from above, and many models still include base light from below the stage for transparencies. Many incorporate macro focus and brackets to fit 35mm slides and have internal digital storage for capture, storage, and display of still images in any order. Most models offer both RGB output for computers or data projectors and composite/S-Video connections for direct projection, monitor display, or analog video recording. XGA and SXGA resolutions provide detail sufficient to clearly display an entire 8.5"×11" page. Digital outputs include direct USB connections for computer capture and DVI for fine-detail HD display. IP addressing has enabled both Internet/LAN signal distribution and online control from anywhere.

AVerMedia Technologies AVerVision 300p

MULTIMEDIA FEATURES

Microphone and line-level audio inputs and stereo outputs have transformed document cameras into multimedia visual presenters capable of worldwide broadcast with live manipulation of 3D objects to rival the ceiling-mounted TV cameras on cooking shows. Indeed, ceiling-mounted document cameras with frame rates up to 15fps can zoom in on an area the size of a postage stamp. Using a base light feature with such zoom capability, photographic slides can be framed and displayed on the stage and then stored in internal memory for later rapid-fire recall. Frame rates of up to 30fps offer the capability to display and manipulate 3D objects without blurry hand motion, and live annotation can be added. By connecting an annotation pad, notes and other markings can be drawn over 2D and 3D objects. The complete annotated image may then be saved to internal memory for later display on command.

MORPHING GADGETS

While feature sets have expanded, the physical housing for these devices has shrunk to allow maximum portability and adaptability. Users can set up in a conference room to interface with any set of the latest display and communication devices. Then they can travel to the boonies for their next presentation, relying on their own gear to do everything. This new adaptability requires presenters to familiarize themselves with the various interfaces, connector options, and physical device variations.

Modern document presentation involves devices with detachable camera arms, movable lighting, and an assortment of housing combinations. Some models include a projector, camera, and display platform in one unit, while others offer the document stage with a camera incorporated under a glass plate similar to that of a copier. These units can connect to external transmission, video recording, or projection devices.

Alliance International Intelligent Vision iV-200E

If a computer is to be used along with the visual presenter, a good feature to look for is an RGB input on the document display device so it may be connected between the computer and a data projector. This can be a very handy feature when paper documents must be incorporated into an existing PowerPoint presentation on short notice. Not all models allow this RGB pass-through to work when the document presenter is turned off, so if this connection scenario is anticipated, it would be wise to test this capability before buying.

If manipulation of 3D objects is going to be part of the user's repertoire, a 15fps frame rate is the minimum and 30fps is better. Programs that use a lot of still images on slides can benefit from a product with maximum still image capture, particularly in the absence of a computer. Some models include software that allows the presenter more freedom and mobility by enabling a mouse or pointer to be used from a position away from the display unit. For presentations that will be used in videoconferences, a unit that includes internal microphone and IP interfacing can simplify connections, eliminate a lot of add-on boxes, and provide the presenter a more professional and tech-savvy appearance.

The bottom line is this: The wide range of features on modern visual presenters demands a greater degree of training in their use. A good place to start is by noting the type of each connector on the unit and the signal it carries. It's a good idea to anticipate what devices may be connected to the inputs and outputs and to practice using them. Just a little advance preparation with a modern visual presenter can make any user look like a pro.

Epson ELPDC05

THE MARKET

In November, Alliance International, the U.S. distributor for Avio (Nippon Avionics), announced the debut of the Intelligent Vision iV-200E, which incorporates a 2 million-pixel progressive scan CCD camera under the transparent document stage for clear display of printed pages, magazines, transparencies, books, or 3D objects. With no external camera arm lights or focus buttons to deal with, anyone who has used an office copier or overhead projector will feel right at home operating this product. Entire page images or sections selected with the 6X digital zoom can be transferred directly to a computer via USB with iViewer software that includes annotation and whiteboard functions. The iV-200E connects to an external data projector with the usual RGB cable connector. With one button push, up to 32 1600×1200-pixel internally stored images are transferred at about six pages per second to the computer. Images may also be saved to Compact Flash. The unit currently retails for just more than $3,000.

AVerMedia Technologies has just introduced what it bills as the first 3-megapixel document camera for less than $1,000. The AVerVision 300p packs many features in a highly mobile package. The 8X digital zoom and pan capability is complemented by the patented 2X AVerZoom enhancement. The f1.8 lens allows display of documents, 3D objects, X-rays, and microscopic images, with a frame rate up to 12fps and output resolution of 1024×768 with the 1/2in. CMOS color image sensor. Other features include image reverse, night view, image freeze, USB 1.1-to-PC transfer, internal 80-image capture, active pass-through, composite and S-Video outputs, text/graphic mode, remote control, manual focus, and auto/manual white balance and exposure. Optional accessories include a light box and microscopic adapter. All this is packed into a unit weighing less than 4.5lbs.

One of Canon's more recent offerings in the visual presenter market is the RE-455X visualizer. The device displays 2D media and 3D objects in 1024×768 resolution and includes a 12X zoom lens for display of objects as small as 1.2"×0.9" or as large as 12.1"×9". Also featured are twin fluorescent lamps and RGB input for seamless switching between an external computer and the document stage. A single button push automatically frames A4 documents. The unit features composite and S-Video outputs and RS-232 remote control through a mini-DIN connector. Auto/manual white balance, auto-exposure, and auto-focus ensure easy operation, and for more challenging 3D object display, manual focus mode may be used at a 15fps frame rate. A single image may be temporarily stored in internal memory. The RE-455X lists for around $1,400.

Casio has produced an imaginative and versatile document presentation solution with the YC-400 multi-functional camera system. When folded for travel, this machine looks just like a laptop, but it unfolds to present a capture/display system with a detachable 4-megapixel digital camera. It can be used to photograph, store, and project images from whiteboard displays, pages, and 3D objects, and even allows cropping to eliminate unneeded areas. Other features include 3X optical zoom, 7.5X scrollable digital zoom, auto/manual white balance and shutter speed, auto focus, internal Flash memory, and SD-card slot. In addition to the standard document camera mode, the unit may be operated in Scanner Mode for capturing document images, PC Image Mode for displaying a series of computer-stored pictures, Camera Image Mode for using images stored internally, and Presentation Mode for using images created in PowerPoint and other applications. The versatile YC-400 is priced at $999.

For permanent installations where the presentation stage will remain fixed, such as with a conference table or large classroom podium, ClearOne Communications offers the Ceiling DocCam II. This design places the camera in the ceiling above the presentation surface where it is controlled via IR remote or RS-232 VISCA with an AMX or Crestron interface. Far-end control of the unit in a videoconferencing system is also possible. A positioning laser guides the user in placing the document to be displayed. From a ceiling height of 8ft. to 12ft., the DocCam II can zoom in on an area the size of a postage stamp with 480 TV-line resolution and S-Video or composite video output. A single Cat-5 cable provides power, control, and video. The CCD camera features 25X optical and 12X digital zoom, 2.5 lux sensitivity, 49dB signal-to-noise, auto white balance, auto/manual brightness and focus, and six presets. Available in both NTSC and PAL formats, the Doccam II retails for around $2,300.

ClearOne Communications Ceiling DocCam II

The Dukane DVP505A visualizer packs powerful features into a more conventional tabletop foldout configuration. The camera provides 1024×768 resolution through VGA or DVI connections or composite/S-Video outputs with a 12X optical and 4X digital zoom. The stage may be lit either from the fluorescent arms or backlit from below. Control is provided locally or through a credit card-sized remote using RS-232. Display may also be switched between the presenter and a computer connected to its VGA input. Up to 32 images may be internally stored and transferred to PC via USB or to a PC card Type 2 slot. Additional features include auto white balance, image freeze, 12V DV output, brightness control, three-language menu, and image flip. There is also a microphone input and sound output for amplifier connection. A mouse may be connected for pointer control over the displays. With a little shopping around, the DVP505A can be found for less than $1,800.

The Elmo HV-8000SX adds IP connectivity to a wide range of strong features customary from this leader in the visual presenter market. With base light and top light arms, the product allows web access and LAN-based computer control, and IP transmission of live images. Add to this a mouse supplied with the unit, handheld IR remote, and RS-232 for a complete control solution. Video outputs in both NTSC and PAL include composite and S-Video. The unit offers 10X optical zoom complemented by 2X electronic magnification. Also included are auto/manual white balance, image rotation, pause mode, gamma adjustment for ambient light variation, automatic and powered manual focus, USB output for image transfer to PC, 7.5fps frame rate, and aperture selection. Sound capability includes a microphone input and stereo audio inputs and outputs via mini jacks. The HV-8000SX may be purchased for less than $5,000.

For presentations involving manipulation of 3D objects, the Epson ELPDC05 is a strong contender with its 20fps frame rate. The presenter also excels in the variety of computers that it can accommodate, including Macs and the Sun SPARCstation. It provides 1024×768 resolution with a superior 18X optical/2X digital zoom, auto/manual focus, iris and white balance, analog RGB input and output with switching between applications, control by handheld remote and RS-232 on Sub-D connection, onscreen display with included mouse, and eight-image internal storage. Data can be rotated and transferred to computer by USB connection and ImageMate software. The ELPDC05 also features built-in scrolling, one-touch freeze, negative/positive conversion, tilting camera head, onscreen display menu, and color/monochrome display selection. The remote tucks neatly away in an integral drawer. This product lists for $3,795.

The current champion of internal image storage is the Lumens PS600 desktop visualizer, with a capacity of 64 JPEGs. A handheld remote can be used to control playback of stored frames. Compact Flash transfer and 22fps frame speed contribute to the strong performance of this product. RS-232 control is coupled with Ethernet connectivity for a versatile control scenario. The PS600 also offers an interesting side-by-side display feature for live and saved image comparison. Switching between stage display and computer pass-through is included, as is mouse-based annotation, key lock, optional local LCD monitor, and localized user guide. The 12X optical/4X digital zoom is accompanied by auto/manual focus, iris, and white balance. A versatile array of outputs includes VGA, DVI, and composite video. Computers connect by USB and Ethernet, while RS-232 remote control interfaces with a standard D-Sub9 male. A PS2 allows mouse control for highlighting and annotation of images. The PS600 sells for slightly more than $2,000.

Introduced at InfoComm 2005, the Promax Technology DG800 incorporates projector control of power and input sources on the local panel. The 12X optical zoom is complemented by a 4X digital zoom and 850,000-pixel imaging. The DG800 also features nine-image internal storage, image rotating, freeze, text/graphics enhancement, split-screen display of live and stored images, and USB connectivity for computer save and edit functions. Interfaces include two RGB outputs and inputs, S-Video in and out, and RS-232 remote control on a Sub-D male connection. Automatic/manual focus, iris control, and brightness and color adjustment modes along with a 15-20fps frame rate allow easy display and manipulation of 3D objects. Line- and mic-level audio inputs and output are available on mini jacks. The DG800 currently sells for just less than $2,000.

WolfVision VZ-9

With a 1/2in. CCD and 1.5 million-pixel imaging, camera quality is paramount in the Samsung SDP-6500 digital presenter. PC- and Mac-compatible, this model offers a 15fps frame rate with a 12X zoom, as well as auto/manual focus and iris control, digital image rotation, internal image storage, RGB pass-through, and a USB port for additional image storage beyond the eight-frame internal storage capacity. The unit allows video output in S-Video, composite, and VGA with 700 TV lines resolution. The user may program four separate presets with a combination of zoom, focus, iris, positive/negative display, and other parameters. Onscreen mouse annotation and live/stored image split add to the product's versatility. An optional LCD monitor can be a valuable help in allowing the user to monitor the presentation without losing eye contact with the audience. The SDP-6500 is available for around $3,500.

An interesting variant in the realm of still-image presentation is the Toshiba TDP-T91U. This unit is actually a DLP projector that incorporates a detachable document camera arm as one component in a very versatile machine. The product also features integrated 802.11 wireless IP connectivity and a Type 2 storage card slot for computer-free configuration. The document camera arm can be removed from the side of the projector, placed anywhere nearby, and connected via RGB cable in order to suit any setup scenario. Capable of two-step focus but including no zoom, it also folds up for compact storage and can be carried separately. Video inputs pass NTSC, PAL, and SECAM through RCA and S-Video connections. The projector can accept stereo sound input through a stereo mini jack and also includes separate RCA audio inputs for the composite and S-Video sources. With some shopping around, this uniquely versatile and compact unit can be found for less than $1,500.

Among the fixed-position, ceiling-mounted products, Vaddio offers an interesting model in the CeilingView Mega-Pro visualizer. The three-HADD CCD camera sports a 12X optical auto-focus zoom coupled with a 4X digital zoom, VISCA control, and the ability to select a 4:3 or 16:9 aspect ratio. This model also aligns with a growing trend in the fixed-mount camera realm, where video, power, and control are provided on Cat-5 cable. The PowerRite 18VDC power supply regulates the unit's power draw. The laser light locator lets users accurately position documents and other displays for correct framing. The laser can operate in momentary or continuous ON mode. The black-box mounting enclosure can secure the camera in both suspended or sheetrock ceilings. Using the IR remote, users have control of zoom, aspect ratio, output resolution, six zoom presets, a laser pointer, and other features. The unit lists for just less than $7,000.

The VZ-9 visualizer from WolfVision, a leader in the field of document cameras, offers a host of features that make this little machine one of the most multi-talented products around. The VZ-9 features progressive scanning at 30fps and RGB and digital DVI outputs, along with PAL or NTSC on the S-Video connector, and displays aspect ratios of 4:3, 16:9, and 16:10 in HD 720p and 1080p. For simple operation, the unit will recognize the format of connected equipment and automatically select the right output format. Auto/manual focus, iris, and white balance will suit 2D and 3D objects while image-turn mode, Twain-compatible 3D scanning, and a digital scaler offer clarity in fine detail for documents with small print sizes. RGB external computer input is switchable, and nine-image internal storage is extended via USB output for computer file saving. A built-in LCD monitor beside the display stage allows for easy monitoring with no user neck-swiveling, and right beside that is a built-in light field for displaying 35mm slides. LAN connection is also available. The VZ-9 retails for $6,550.