MIT-HOL keredes: CMOS integralt aramkorok

[Omikk Tajekoztatas]

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Tisztelt Olvasonk,

Az OMIKK allomanyaban onallo konyvet nam talaltunk a CMOS
gyartastechnologiajarol, de ket, nalunk egyebkent helyben hasznalhato
CD-ROM adatbazisunk szamos angol nyelvu cikket tartalmaz. Ezek egy resze
teljes szovegeben is hozzaferheto. Elozetes tajekozodashoz mellkeltem
kuldunk Onnek ket filet. Amennyiben tovabbi cikkekre lenne szuksege, kerem
keresse fel konyvtarunkat. Nyitva: H,Cs.: 13-20 oraig, K,Sze,P.: 9-20 oraig.


Udvozlettel

Az Internet-konyvtaros
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Computer Select, April 1999
COPYRIGHT 1998 Seybold Publications Inc.
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The Seybold Report on Internet Publishing

The Seybold Report on Internet Publishing  Sept 1998 v3 n1 p18(1)
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Sound Vision sets a new standard for low-end professional digital cameras
(Sound Vision CMOS-Pro)

Author
Henshall, John

Full Text
CMOS technology blows away pricing of standard CCD-based cameras

Following up last year's introduction of CMOS technology to digital cameras, Sound Vision this month announced a new camera that dramatically improves the price-performance ratio of professional-quality studio cameras.

The Sound Vision CMOS-Pro camera is an unprepossessing black box that produces images that are a mere 960800 pixels in resolution. But don't let surface impressions fool you: This camera produces images by which others-even those with a much higher nominal specification-should be judged.

The camera-aimed at those who can't afford a Leaf Digital Camera Back or similarly expensive studio cameras-will appeal to studio photographers, prepress shops and printers new to digital photography.

The CMOS advantage. Until now, all professional digital cameras-and most flatbed scanners-have used arrays of charge-coupled devices (CCDs) to capture images. The CMOS-Pro is the second camera, and the first professional one, to use a chip based on CMOS (Complementary Metal Oxide Semiconductor) technology.

Unlike CCDs, which are made in custom wafer facilities and have a high percentage of unusable parts, CMOS chips can be fabricated on traditional semiconductor wafer lines with higher yields. This reduces manufacturing costs, which leads to a lower-priced camera.

CMOS sensors consume less battery power; they don't suffer from blooming or overexposure smear; and they offer equal or better specs for noise and dynamic range. Coupled with their lower cost, they result in sensors that can rival CCDs in quality at a lower price.

The man behind the Sound Vision CMOS technology is Bob Caspe, the founder of Leaf. In 1992 at the Photokina exhibition, Caspe introduced to the world the Leaf Digital Camera Back, which set benchmark standards in high-end digital capture. Caspe has since sold Leaf to Scitex, but at Sound Vision's debut last year at the PMA show in New Orleans, it was clear that he intended to continue making his mark in the digital photography marketplace.

At that time, Vivitar announced a $500 to $600 camera based on Sound Vision CMOS chips (Vol. 1, No. 7, pp. 19-20). Sound Vision still offers consumer-level chipsets to the OEM market, but it intends to market the CMOS-Pro, which costs $2,000 and produces professional results, directly.

Operation. The black box of the CMOS-Pro camera measures 5.5?4?1.75 inches (14?10?4.4 cm). It has no viewfinder and no operational controls. There is a C-mount lens thread on the front and tripod bushes top and bottom. On one end are two SCSI-2 connectors together with SCSI ID and termination switches (or a parallel port for the PC version), a flash sync connector and 6 VDC power in socket. That's all.

Almost any C-mount lens may be used. C-mount, developed decades ago for 16mm motion-picture cameras, is now used for CCTV, so a wide range of lenses are available, including fisheyes. Extension tubes, and macro- and microscope adapters are also available, as are adapters for 35mm SLR lenses.

The camera is set up and operated from a computer running Photoshop with the Sound Vision plug-in.

The interface has two video preview modes for framing, a zoomed-in mode and sharpness bar for focusing, and an exposure control for video and continuous lighting shots. A "final image" mode enables selection of monochrome (single exposure) or color (three exposure), flash or continuous lighting, a histogram with adjustment for black and white points, plus neutral to set a color balance using a gray card. Clicking "Upload Image" loads the image into Adobe Photoshop and interpolates it to 200 percent-1,9201,600 pixels (about 8 MB). Clicking "Save Image" saves the image at its natural resolution, a 960?800-pixel TIFF file.

A color exposure using flash takes approximately 23 seconds from clicking the "Take Picture" button. The red exposure occurs after 4.5 seconds, followed by the green exposure 7 seconds later, followed by blue after another 7 seconds. Then it takes 5 seconds more for the three exposures to be processed as one and to be displayed on the computer monitor. This means that the camera cannot be used for photographing live subjects, except in monochrome.

Quality assessment. Pixel interpolation, mediocre lens quality, "noise" in the signal and the substantial compression of images for storage on limited-capacity removable media are just some of the factors that reduce the quality of images in "cheap" single-exposure cameras using similar pixel-count sensors.

In contrast, each of the CMOS-Pro's pixels is exposed three times, through a rotating filter wheel inside the camera, so three times more real picture information is captured.

The result is that the images produced by this camera are of exceptionally high quality-pure, clean and free of artifacts. These are by far the finest quality images at this resolution that we have ever had the pleasure of seeing. In short, they are stunning.

Astounded by their purity, we made some 8?10? dye-sublimation prints. Pure, clean images also tend to interpolate up well and, sure enough, the CMOS-Pro images are acceptable even at this size. an this be possible from a 960?800-pixel image? It is. Sizes up to 5??6? in a high-quality magazine should be no problem. And that covers most images.

In short, when it comes to pixels, size is no longer everything; the quality of the pixels should also be considered. Unfortunately, we have been conditioned to accept much lower quality, and to judge cameras on the basis of the number of pixels they provide. We recommend that every digital camera designer, manufacturer, salesman and photographer study the excellence of CMOS-Pro pictures and use them as a benchmark.

Irresistible price. Of course, we expect to pay for state-of-the-art quality. But because CMOS sensors are much less expensive to make than CCDs, the CMOS-Pro costs only $2,000. (Many photographers will want to use their own lenses; Sound Vision offers the camera for $2,300 with 12.5mm and 50mm lenses.)

In short, for a modest sum, the Sound Vision CMOS-Pro will set you on precisely the right learning curve and continue to be a useful, productive and profitable instrument long after you make larger investments. If you've been considering dipping your toe into the murky waters of digital acquisition, but are worried about justifying the outlay, the CMOS-Pro could be just the answer to your ROI prayers. Amen.


Sound Vision Inc.

492 Old Connecticut Path

Framingham, MA 01701

Phone (508) 270-0027

Fax (508) 620-7692

www.soundvisioninc.com

www.cmospro.com


Thumbs Up on CMOS-Pro

Pros

Stunning picture quality

Great for product shots

Simple but good software interface

Interchangeable (C-mount) lenses

Good price

Cons

Cannot capture "live" subjects in color

Needs to be tethered to a computer

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Type
Product Announcement

Company
Sound Vision Inc.

Product
Sound Vision CMOS Pro (Digital camera)

Topic
Hardware product introduction
Digital camera

Record #
21 097 584




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Computer Select, April 1999
COPYRIGHT 1998 CMP Publications, Inc.
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Electronic Buyers' News

Electronic Buyers' News  Sept 21, 1998 n1127 p24(1)
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TI rolls out new CMOS family
(Texas Instruments Advanced Very-Low-Voltage CMOS chip)

Author
Dunn, Darrell

Full Text
Dallas- Logic market leader Texas Instruments Inc. has introduced a chip family that provides maximum propagation delays of less than 2 ns.

In addition, the Advanced Very-Low-Voltage CMOS (AVC) family has been optimized for low-power 2.5-V systems, and features an internal circuit that reduces component costs and board space by eliminating the need for discrete damping resistors, said Ed Agis, worldwide product marketing manager for logic products at TI.

"While many systems are on the verge of making the transition from 3.3 V to 2.5 V, we're also seeing that bus speeds are increasing beyond 100 MHz," Agis said. "This creates a real need in the market for next-generation high-speed, low-voltage logic, and these devices are more than 40% faster than comparable logic available today."

The AVC logic devices will also support mixed-voltage-mode systems and are compatible with 3.3- and 1.8-V devices.

TI sees the AVC devices as the next step beyond existing Low-Voltage CMOS and Advanced Low-Voltage CMOS logic families currently on the market, which have propagation delays of more than 4 ns.

"We're beginning to look at the logic standard for the next five years," Agis said. "PC OEMs are concerned that as the PC-133 specification rolls out, they need the logic to support that higher bus speed."

The AVC family features a dynamic output control (DOC) circuit that automatically varies the output impedance of the circuit during signal transitions to reduce noise. The DOC provides enough current to achieve high signaling speeds, but quickly switches the impedance level to reduce the undershoot and overshoot noise often found in high-speed logic.

Packaging options include TSSOP and TVSOP. The first AVC devices will begin sampling in the fourth quarter, with production scheduled for the first quarter of 1999.

Copyright 1998 CMP Media Inc.

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Type
Product Announcement

Company
Texas Instruments Inc.

Product
Texas Instruments Advanced Very-Low-Voltage CMOS (Microprocessor)

Topic
Microprocessor
Hardware product introduction

Record #
21 148 043




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