Amnesia
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Ambient light
Any light in the observation room is created by a source other than a projector or screen.
Aspect ratio
The ratio of the height or width of the frame or screen. In the 4: 3 aspect ratio, the width of the image is 4/3 times the height. Most TV and computer video formats currently have an aspect ratio of 4: 3. A 15-inch monitor is 12 inches wide and 9 inches high (9 * 4/3 = 12). The resolution of 640x480 is 4: 3 format (480 * 4/3 = 640). The aspect ratio of SXGA is 5: 4 (1280x1024), the impact of high-definition TV is 16: 9, and the slide of 35mm is 3: 2.
ANSI lumens
ANSI stands for American National Standards Institute. It is a standard for measuring light output. Different lamps play a role in light output. The halogen lamp looks darker than another metal halide, even though the two units have the same ANSI lumen rating. The type of LCD technology (active matrix TFT, Poly-Si, passive), the overall technology type (LCD and DLP and CRT), contrast and other factors will also affect the final result.
Backlight
Remote control, projector control panel or other objects illuminated from behind. This may help when working in a dark room.
bandwidth
Frequency range of specific transmission method. In video systems, this value is expressed in MHz. The better the signal, the greater the bandwidth required.
Bitmap graphics
The type of graphics defined and addressed bit by bit, so that all points on the screen can be directly accessed.
Build a slide
The "Building Series" slide shows an audience whose topics line up at a time. Each new line added will be displayed in a bright color, while the previous line will fall back to a darker color.
button
Graphical elements within the interface represent embedded operations or functions.
Color temperature
A method of measuring the "whiteness" of a light source. Metal halide lamps produce higher temperatures than halogen or incandescent lamps.
Clip art
Graphics previously published can be imported into presentations simply by copying and pasting.
Color resolution
The total number of available colors, expressed in bits per pixel.
compatible
When different hardware or software can be used together without significant overload.
Contrast
The ratio between white and black. The greater the contrast, the greater the projector's ability to display fine color details and tolerate unrelated room light. The projection industry uses two methods: 1) Full on / off contrast measures the ratio of the light output of a completely white image (full on) to the light output of a completely black (full off) image. 2) ANSI contrast is measured with 16 alternating black and white rectangular patterns. The average light output of the white rectangle is divided by the average light output of the black rectangle to determine the ANSI contrast. When comparing the contrast of the projector, make sure to compare the same type of contrast. For the same projector, the full on / off contrast is always greater than the ANSI contrast.
Diagonal screen
From one corner of the screen to the opposite corner. A 9FT high and 12FT wide screen with a diagonal of 15FT. If the screen is 12x12, it will still be aligned to the 15FT diagonal, because that will be available diagonally.
Digital Light Processing (DLP)
DLP, developed by Texas Instruments (TI), is a light processing system that uses hundreds of thousands of micro rotating mirrors to reflect images. Many people think that this is the most accurate color and image reproduction.
Dot pitch
The distance between the points on the CRT display. The closer the dots, the higher the resolution of the displayed image.
shake
By adding color or random noise during the digitization process, the digital image looks smoother.
EGA
AKA Enhanced Graphics Array, EGA is a 640 pixel by 350 line image, where 16 colors come from a palette of 64 colors.
Front room projector or location
For the unit close to the screen, the size of the image projected by the short-focus lens is approximately the same as the distance of the screen. 6FT diagnosis. Screen = 6FT distance. In general, the unit may be close to 3/4 of the screen size or 1.2 times the image size.
Front room projector or location
The projection unit close to the screen, therefore requires a shorter projection distance.
Flat screen
By using more than one electron gun, the CRT is flatter than the standard tube. Good for those who need simple reproduction and detailed design.
focal length
Focal length is the distance between the lens and its focal point. A smaller focal length means a wider angle lens.
Genlock
Synchronize the signal between two video sources, which is necessary when overlaying computer graphics on images from a VCR, camera or video player.
Ghost
Shadows or weak secondary images created by multiple-path broadcast transmission errors seen on a monitor or display.
High gain screen
A screen that uses one or more methods to collect light and reflect it back to the audience, which will increase the brightness of the image on a white wall or semi-matte screen.
H sync
AKA horizontal synchronization. A mark that indicates to the computer or video signal that it is the beginning of a line.
HDTV
AKA HD TV. High-definition wide-screen TV broadcasting with digital audio.
Horizontal frequency
AKA kHz, showing the total number of horizontal lines scanned per second in the image.
Horizontal resolution
The total number of vertical lines perceived separately on the horizontal line of the monitor.
hertz
AKA Hertz. Frequency measured in cycles per second. Used to indicate the frequency of electrical signals or events.
Reverse the image
Many ceiling-mounted projectors are installed upside down. Reversing the image corrects the image digitally, so your projected image will not be reversed.
Interlaced
A technique used to reduce the flicker that disappears when the first created video field is written to the next video field.
JPEG
AKA Joint Photographic Experts Group. A working international organization, the proposed universal standard for digital compression and decompression of still images used in computer systems. The JPEG concept reduces the image size to 65: 1, and still maintains image integrity by eliminating the slight chromatic aberration that the human eye cannot see.
Keystone correction
The projector can correct the effect of "up" or "down" on the screen, allowing the projector user to view a rectangular image instead of an image with a wide top or bottom.
Trapezoid
The distortion of the projected image caused by the projector pointing "up" or "down" to its screen (usually the wide top and narrow bottom effect) It is named after its similar shape to the foundation stone of the arch.
LCD
AKA LCD display. The technology comes in many forms, sizes and resolutions. Its main purpose is to present digital images for viewing. They are used in many notebook computer monitors and are also used as a technology inside projectors to project high-resolution digital images.
Laser pointer
A handheld device that emits a thin laser beam to focus bright spots (usually red) on the projected image or almost anywhere. The presenter uses it to guide the audience's eyes to a specific point of interest.
Grating
A screen surface with an embossed geometric pattern, which affects viewing angle / angle performance and reflection of ambient light.
Long shot lens
A lens designed to project from behind the room. The long lens will be used in the projection room behind the theater, or from behind the large classroom. The long projection lens must return to 50 to 100 feet to project a 10FT diagonal image.
Metal halide lamp
The type of lamp used by most high-end portable projectors. These lamps output very "hot" temperature lamps, similar to the lamps used in street lamps. The metal halide white is super white (slightly bluish), in contrast, the halogen lamp white is very yellow.
Multimedia presentation
Integrate text, art, graphics, photography, animation, audio and video into presentations.
NTSC
USAA's video and broadcast standards. It actually has a lower resolution than the system used in most parts of the world. However, by 2002, radio stations will be required to broadcast higher resolution video signals.
The internet
Allow two or more computers to exchange information quickly and easily.
Yield
The material generated by the computer from its memory is used for display on a monitor or transmission to other media, such as paper or magnetic storage (such as zip or floppy disk or CD-ROM)
Any light in the observation room is created by a source other than a projector or screen.
Aspect ratio
The ratio of the height or width of the frame or screen. In the 4: 3 aspect ratio, the width of the image is 4/3 times the height. Most TV and computer video formats currently have an aspect ratio of 4: 3. A 15-inch monitor is 12 inches wide and 9 inches high (9 * 4/3 = 12). The resolution of 640x480 is 4: 3 format (480 * 4/3 = 640). The aspect ratio of SXGA is 5: 4 (1280x1024), the impact of high-definition TV is 16: 9, and the slide of 35mm is 3: 2.
ANSI lumens
ANSI stands for American National Standards Institute. It is a standard for measuring light output. Different lamps play a role in light output. The halogen lamp looks darker than another metal halide, even though the two units have the same ANSI lumen rating. The type of LCD technology (active matrix TFT, Poly-Si, passive), the overall technology type (LCD and DLP and CRT), contrast and other factors will also affect the final result.
Backlight
Remote control, projector control panel or other objects illuminated from behind. This may help when working in a dark room.
bandwidth
Frequency range of specific transmission method. In video systems, this value is expressed in MHz. The better the signal, the greater the bandwidth required.
Bitmap graphics
The type of graphics defined and addressed bit by bit, so that all points on the screen can be directly accessed.
Build a slide
The "Building Series" slide shows an audience whose topics line up at a time. Each new line added will be displayed in a bright color, while the previous line will fall back to a darker color.
button
Graphical elements within the interface represent embedded operations or functions.
Color temperature
A method of measuring the "whiteness" of a light source. Metal halide lamps produce higher temperatures than halogen or incandescent lamps.
Clip art
Graphics previously published can be imported into presentations simply by copying and pasting.
Color resolution
The total number of available colors, expressed in bits per pixel.
compatible
When different hardware or software can be used together without significant overload.
Contrast
The ratio between white and black. The greater the contrast, the greater the projector's ability to display fine color details and tolerate unrelated room light. The projection industry uses two methods: 1) Full on / off contrast measures the ratio of the light output of a completely white image (full on) to the light output of a completely black (full off) image. 2) ANSI contrast is measured with 16 alternating black and white rectangular patterns. The average light output of the white rectangle is divided by the average light output of the black rectangle to determine the ANSI contrast. When comparing the contrast of the projector, make sure to compare the same type of contrast. For the same projector, the full on / off contrast is always greater than the ANSI contrast.
Diagonal screen
From one corner of the screen to the opposite corner. A 9FT high and 12FT wide screen with a diagonal of 15FT. If the screen is 12x12, it will still be aligned to the 15FT diagonal, because that will be available diagonally.
Digital Light Processing (DLP)
DLP, developed by Texas Instruments (TI), is a light processing system that uses hundreds of thousands of micro rotating mirrors to reflect images. Many people think that this is the most accurate color and image reproduction.
Dot pitch
The distance between the points on the CRT display. The closer the dots, the higher the resolution of the displayed image.
shake
By adding color or random noise during the digitization process, the digital image looks smoother.
EGA
AKA Enhanced Graphics Array, EGA is a 640 pixel by 350 line image, where 16 colors come from a palette of 64 colors.
Front room projector or location
For the unit close to the screen, the size of the image projected by the short-focus lens is approximately the same as the distance of the screen. 6FT diagnosis. Screen = 6FT distance. In general, the unit may be close to 3/4 of the screen size or 1.2 times the image size.
Front room projector or location
The projection unit close to the screen, therefore requires a shorter projection distance.
Flat screen
By using more than one electron gun, the CRT is flatter than the standard tube. Good for those who need simple reproduction and detailed design.
focal length
Focal length is the distance between the lens and its focal point. A smaller focal length means a wider angle lens.
Genlock
Synchronize the signal between two video sources, which is necessary when overlaying computer graphics on images from a VCR, camera or video player.
Ghost
Shadows or weak secondary images created by multiple-path broadcast transmission errors seen on a monitor or display.
High gain screen
A screen that uses one or more methods to collect light and reflect it back to the audience, which will increase the brightness of the image on a white wall or semi-matte screen.
H sync
AKA horizontal synchronization. A mark that indicates to the computer or video signal that it is the beginning of a line.
HDTV
AKA HD TV. High-definition wide-screen TV broadcasting with digital audio.
Horizontal frequency
AKA kHz, showing the total number of horizontal lines scanned per second in the image.
Horizontal resolution
The total number of vertical lines perceived separately on the horizontal line of the monitor.
hertz
AKA Hertz. Frequency measured in cycles per second. Used to indicate the frequency of electrical signals or events.
Reverse the image
Many ceiling-mounted projectors are installed upside down. Reversing the image corrects the image digitally, so your projected image will not be reversed.
Interlaced
A technique used to reduce the flicker that disappears when the first created video field is written to the next video field.
JPEG
AKA Joint Photographic Experts Group. A working international organization, the proposed universal standard for digital compression and decompression of still images used in computer systems. The JPEG concept reduces the image size to 65: 1, and still maintains image integrity by eliminating the slight chromatic aberration that the human eye cannot see.
Keystone correction
The projector can correct the effect of "up" or "down" on the screen, allowing the projector user to view a rectangular image instead of an image with a wide top or bottom.
Trapezoid
The distortion of the projected image caused by the projector pointing "up" or "down" to its screen (usually the wide top and narrow bottom effect) It is named after its similar shape to the foundation stone of the arch.
LCD
AKA LCD display. The technology comes in many forms, sizes and resolutions. Its main purpose is to present digital images for viewing. They are used in many notebook computer monitors and are also used as a technology inside projectors to project high-resolution digital images.
Laser pointer
A handheld device that emits a thin laser beam to focus bright spots (usually red) on the projected image or almost anywhere. The presenter uses it to guide the audience's eyes to a specific point of interest.
Grating
A screen surface with an embossed geometric pattern, which affects viewing angle / angle performance and reflection of ambient light.
Long shot lens
A lens designed to project from behind the room. The long lens will be used in the projection room behind the theater, or from behind the large classroom. The long projection lens must return to 50 to 100 feet to project a 10FT diagonal image.
Metal halide lamp
The type of lamp used by most high-end portable projectors. These lamps output very "hot" temperature lamps, similar to the lamps used in street lamps. The metal halide white is super white (slightly bluish), in contrast, the halogen lamp white is very yellow.
Multimedia presentation
Integrate text, art, graphics, photography, animation, audio and video into presentations.
NTSC
USAA's video and broadcast standards. It actually has a lower resolution than the system used in most parts of the world. However, by 2002, radio stations will be required to broadcast higher resolution video signals.
The internet
Allow two or more computers to exchange information quickly and easily.
Yield
The material generated by the computer from its memory is used for display on a monitor or transmission to other media, such as paper or magnetic storage (such as zip or floppy disk or CD-ROM)
