Images can be saved in an interlaced format, so that rather than consecutively displaying the lines that make up the image, the image displays every eighth line and than every fourth line so that the viewer can see a preview. Presenting interlaced images lets the reader begin scrolling through the page while the image loads. Interlaced GIF's, Progressive JPEG's, and PNG's are all examples of interlaced file formats.
The process by which a monitor draws only the even or odd horizontal lines With each vertical refresh. This allows the monitor to draw twice as many Lines per refresh. However, if you are using an application that requires Fast refreshes, like streaming video or animations, this can create flickering and a chunky feel.
A system developed for television which divides each video frame into two fields (upper and lower). This is done by first drawing one field consisting of an image’s odd scan lines (1, 3, 5... 525) and then drawing the remaining even scan lines (2, 4, 6...), interweaving both fields. Interlacing reduces the perception of screen flicker. Interlacing can cause annoying effects with images such as computer generated text and graphics when transferred to video.
A technique used in some raster-scan displays in which the electron beam refreshes (updates) all odd-numbered scan lines in one sweep of the screen and all even-numbered scan lines in the next. Interlacing takes advantage of both screen phosphor’s ability to maintain an image for a short time before fading and the tendency of the human eye to average, or blend, subtle differences in light intensity. By refreshing alternate sets of lines on the display, interlacing halves the number of lines that must be carried in a single sweep of the screen and also halves the amount of information that must be carried by the display signal at any one time. Thus, interlacing updates any single line on the screen only 30 times per second, yet it provides the equivalent of a 60-cycles-per-second refresh rate.
The storage of image scan lines in an order other than the traditional top-to-bottom or bottom-to-top order.
System developed for early television and still in use in standard television displays. To compensate for limited persistence, the electron gun used to illuminate the phosphors coating the inside of the screen alternately draws even, then odd horizontal lines. By the time the even lines are dimming, the odd lines are illuminated. We perceive these “interlaced” fields of lines as complete pictures.
When the cathode-ray tube (CRT) of a monitor scans every other row to display information on the screen.
Interlaced video is video captured at 50 pictures (known as fields) per second, of which every 2 consecutive fields (at half height) are then combined into 1 frame. Interlacing was developed many years ago for the analog TV world and is still used widely today. It provides good results when viewing motion in standard TV pictures, although there is always some degree of distortion in the image. To view interlaced video on e.g. a computer monitor, the video must first be de-interlaced, to produce progressive video, which consists of complete images, one after the other, at 25 frames per second. See also Progressive scan.
A system where each video frame is divided into two fields. The odd field is drawn first (1,3,5 etc), followed by the even field (2,4,6 etc). The alternate lines of each scanned field fall between each other to create the image. It uses half the bandwidth of a progressive signal
Interlacing is a method of displaying image on the screen in its entirety but at low blocky resolution as soon as image appears on the screen. As the image data continues to load, image quality improves. Interlacing is useful option for big images that will be used in WWW. Interlacing only applies to images saved in the GIF and PNG format.
The ability of a GIF file to be loaded for viewing so that it appears to fade-in gradually.
Refers to scanning method used by the majority of televisions and the 1080i HDTV format. Interlacing involves painting the odd-numbered lines of a screen in succession, then going back and filling in all the remaining even-numbered lines. As opposed to progressive scanning in which all the lines are painted in sequence, interlacing is more prone to artifacts and is less stable than progressive.
Even known as progressive display. Both GIF, JPG and TIFF has supported this features since about 1990.
A technique used in video where the odd lines are transmitted first (the odd field) and then the even lines (the even field). Used in NTSC television and in RS-170 video cameras.
Horizontal lines in areas of fast movement caused by the fact that a video frame is made up of two separate fields, each 1/60th of a second apart.
A method of reordering image data so that an approximate version of the whole image may be displayed quickly, and later refined as more of the image data becomes available.
A technique used for the display of live video and some computer graphics whereby the image is displayed in horizontally stacked lines known as fields.
A video display technique in which the electron beam refreshes (updates) all odd-numbered scan lines in one sweep of the screen and all even-numbered scan lines in the next. Interlacing takes advantage of both the screen phosphor's ability to maintain an image for a short time before fading and the human eye's tendency to average subtle differences in light intensity. By refreshing alternate lines, interlacing halves the number of lines to update in one screen sweep.
A method of doubling vertical resolution by displacing odd video frames by one-half scan line.
A feature that renders a GIF image in stages to create the illusion of faster loading. Early in the downloading process, it appears fuzzy and blurry, becoming clearer and more refined until the whole image in loaded. Interlacing creates a subtle increase in overall download time.
A system by which the electron gun in a monitor or television scans even and then odd lines of phosphors inside the CRT. This process is still used in standard television displays, but is not generally in use (or advised) in computer monitors.
A format that allows Web graphics in a GIF file to gradually fade into view.
is the process of combining even and odd fields to form a frame.
PAL video signals transmit odd and even lines alternately. This is a 2:1 interlace. The two sets of lines are combined to form each single frame.
a display method on a raster scan monitor that scans each even number scan line of the screen in one sweep of the screen, and the odd-numbered scan lines on the next sweep.
A method that lets you display an image on screen at a low, blocky resolution. As the image data loads, the image quality improves.
A technique for increasing video resolution by only up-dating alternate horizontal lines on the screen. Because interlacing can result in noticeable screen flicker, most users prefer noninterlaced video adapter resolutions.
Increasing video resolution by doubling the number of horizontal scan lines.
Technique used to reduce flicker caused when the first created video field fades while the next is being written. JPEG AKA Joint Photographic Experts Group. An international group, which is working, on a proposed universal standard for the digital compression and decompression of still images used in computer systems. The JPEG idea reduces image size as much as 65:1 and still maintains image integrity by getting rid of subtle color differences the human eye can not see. Keystone Correction A projectors ability to correct the effects of "pointing up" or "pointing down" at a screen enabling the projector userÂ's audience to view a rectangular image rather than one with a wider top or bottom.
Refers to the technique of increasing video resolution by updating (refreshing) alternate horizontal lines on the screen. Interlacing can cause screen flicker which is particularly noticeable when viewing a monitor via television. Noninterlaced video adapters avoid this viewing issue.
A video frame is made up of two fields. interlacing is the process of scanning the picture onto a video screen whereby the lines of one scanned field fall evenly between the lines of the preceding field.
Progressively displaying an image as it is downloaded to make download times seem faster. Interlacing is supported by GIF, PNG, and JPG graphics file formats.
The television display format, where horizontal lines of pixels are illuminated in an alternating pattern rather than sequentially.
Combining two sets of field lines (“odd-numbered” rows and “even-numbered” rows) to create a single video image.
Interlacing refers to the scanning format of standard television screens. In an interlace format, the entire screen is painted with the electron beam, but in alternating lines. On the first pass the odd-numbered lines are painted, and then the beam makes a second pass to paint the even–numbered lines. In the United States, standard televisions have 525 lines of resolution and the screen is refreshed 30 times a second. This means an interlacing beam paints over 15,000 lines a second.
