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Frequently Asked Questions

What is the difference between interlaced and progressive video?

Frequently Asked Questions - Flying Dutchman Productions
interlaced picture is divided into two halves, the odd and even scan lines. These are "halves" are displayed odd, even, odd, even, etc., at a rate of 60 frames per second. So, in reality at any given time you are only seeing half of the picture (although because the frame rate is so high, your eyes don't notice it.) Interlaced scanning sometimes results in screen flicker and visible scan lines. Standard analog TV signals are interlaced signals.

What is the difference between interlaced scanning and progressive scanning?

HOME ENTERTAINMENT 4 LESS
A television image is created when a device known as the CRT (cathode ray tube) scans a constant stream of electrons across the inside of the picture tube. Each image is created with a series of horizontal lines. In interlaced scanning, the CRT starts with the top line and scans every other line all the way to the bottom of the image. The CRT then returns to the top and scans all remaining lines. This process constructs a complete image 30 times per second.

What is interlaced? What is progressive?

Unofficial Xbox FAQ
Understand first that TV pictures are created by an electron beam that traces the screen from left to right, top to bottom. A 'scan line' is a single left-to-right line made by the beam. In a standard NTSC signal, for example, there are 525 scan lines (you can only see about 480 of them).

What do interlaced and progressive scanning mean?

FAQ
In an Interlaced format, the screen shows a picture in two fields with each field scan every 50th of a second, and then follows that up with the even field in a second scan. Thus the entire picture is scanned every 25th of a second. For smaller screens, this is less noticeable. As screens get larger, the problem with interlacing is the flickering. Progressive scanning shows the whole picture, every line in one showing, and every sixtieth of a second.

What do interlaced and progressive mean?

HDTV FAQ
Interlaced and progressive refer to the way TV signals are displayed on screen. An interlaced system broadcasts each frame as two separate fields, each show alternate horizontal lines. Your brain puts these fields together to make a complete picture. Progressive systems display each frame as a complete image. This makes for higher quality images and is particularly noticeable when viewing scenes in slow motion or pausing the action.

So should I use progressive or interlaced frames?

Yates House Studios - Videography - Frequently asked questio...
Although we normally recommend progressive frames, there is no simple answer to this question. If you want your footage to display correctly on a computer, it has to be deinterlaced at some point; most software DVD players can do this during playback, but they tend to do a fairly poor job. (Some even replace all of the even fields with the odd ones, cutting the vertical resolution of the image in half.

What is the difference between a bifocal and progressive lens?

FAQ Eye Doctor Denver | Eye Care, Exam, Vision Care, Laser S...
A bifocal lens only allows you to have two vision distances (near and far) while progressive lenses give you all your range of vision from distance, intermediate and near in a smooth progression. Most people like the newer technology of the progressive because it allows for more natural vision and cosmetically they look nicer because there is no line. The upside to standard lined bifocals is that the peripheral vision is sometimes better.

Is the CCD "progressive scan"?

Allyn Fratkin's Olympus D-320L Digital Camera FAQ
Not on the D-320L. A progressive scan CCD reads (scans) the image data from top to bottom in one pass. Interlaced (the opposite of progressive) CCD units read an interlaced image in two passes, similar to the way a TV displays an image.

What is progressive scan and do I need this feature?

FAQs About Buying A DVD Player - TimeForDVD.com
Progressive scanning is the ability to generate a picture in one pass (as with a computer monitor). Conventional interlaced scanning requires two passes to generate a picture, the first pass for the odd-numbered scan lines, the second for the even-numbered scan lines. Conventional analog TV as we know it is interlaced scanning with a (complete picture) refresh rate of 30 times per second, while progressive scanning is twice that at 60 times per second.

Can MPEG Intelli Player display a progressive(non-interlaced) video sequence?

MPEG Intelli Player
Yes. It displays any kind of video files as a progressive video sequence. Interlaced video sequences will be de-interlaced during the play.

What is the difference between interlaced and non-interlaced .gifs?

FAQ for comp.graphics.apps.paint-shop-pro
interlaced GIF is one which has been saved in a way which has rough image data at the beginning of the file, so that a blurry, grainy version of the entire image loads first, coming progressively into focus. This is useful for people with slow internet connections (especially with large images), to allow them to get an idea of what the image is about without waiting for the entire download. However, for small images, most people won't see the difference.

What's all this excitement about Frame Movie Mode or Progressive Scan?

Digital Video (DV) Frequently Asked Questions
This is a very controversial topic in the world of HD because Sony's new HD camcorder is higher resolution than JVC's, but it doesn't have progressive scan, as JVC does. Most people seem to agree that JVC's camera is an interesting novelty but not much of a camera. However, the lack of progressive scan is a real problem with the Sony. June 1998] Here is Michael Pappas' article on Frame Movie Mode, which explains what it is and why you might want to use it.

Should I use the Progressive Scan setting on my DVD player to achieve the best quality?

ADS Tech HDTV UpConverter FAQ
If the UpConverter detects a progressive scan signal it cannot utilize it's CinemaView enhancement engine to process the video. You will basically see only a resolution scaled image of the output from your DVD player. We recommend turning off the progressive setting on your DVD player so you may use the advanced Motion Adaptive De-Interlacing, noise reduction and sharpening filters on the video.

What is the difference between progressive and specific rate springs?

SSOTN - Modular FAQ
Progressive rate springs have a variable spring rate. What this means is that the spring gets firmer as it gets compressed. The harder you push into a corner the stiffer the spring becomes. A specific rate springs features the same rate all the time, it does not matter what pressure is applied on the springs. Progressive rate springs tend to have better characteristics on the street where as a specific rate springs shines on the track.

What's the difference between an 8-bit scan and a 16-bit scan?

Gemega Imaging: Frequently Asked Questions
bit scan produces a file that has 256 color tones in each of its Red, Green, and Blue channels. This yields an image capable of displaying 16.7 million unique colors. A 16-bit scan produces a file that has 65,536 color tones in each of its R, G, and B channels. This yields an image capable of displaying 281 trillion unique colors. See next topic.

What is the difference between Auto-Scan and Scan Reminder?

Ultimate Security Suite FAQ
Sol: Auto-Scan will scan according to the time interval set and this is done only when the Ultimate Security Application is running. If the Application is shut down, then Auto-Scan stops working. If you set the Scan Reminder option, scanning is performed at the scheduled intervals even if the Application is shut down. Scan Reminder restarts the Ultimate Security Application and starts the scanning process in the background at the scheduled interval.
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