Photron - High Speed Video Camera for Slow Motion Analysis

INFORMATION ON HIGH SPEED IMAGING

GLOSSARY

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Color Fringing A CCD artifact caused when color filtering arrays or patterns conflict with information in a scene or image scanned or digitally photographed. It appears as magenta and green bands at contrast boundaries. Color fringing is always more apparent on the edge of the image than the center due to the lens curvature. It becomes the worst at the image corners.
Color Saturation In color theory, saturation refers to the intensity of a specific hue. It is based on the color's purity; a highly saturated hue has a vivid, intense color, while a less saturated hue appears more muted and grey. With no saturation at all, the hue becomes a shade of grey. Saturation is one of three coordinates in the HSV color space.
Composite Video Signal Composite video is the format of an analog television signal before it is modulated onto an RF carrier. It is usually in a standard format such as NTSC, PAL or SECAM. It is a composite of three source signals called Y, U and V (together referred to as YUV) with sync pulses. Y represents the brightness or luminance of the picture and includes synchronizing pulses, so that by itself it could be displayed as a monochrome picture. U and V between them carry the color information.
Contrast in an image or scene, the amount of difference between the lightest and darkest areas.
Contrast enhancement The enhancement of contrast by using an image histogram and lookup table to boost the contrast ratio.
Contrast range The range of gray between the lightest and darkest parts of an image; expressed as a ratio of light to dark.
Cooled CCD A CCD sensor that operates at temperatures below ambient to reduce dark current. Cooling is usually done with Peltier coolers or liquid coolers.
D/A converter An electronic device that transforms a signal sample from a digital form to an analog form. The digital form is usually a set of 8 or more binary bits which produces an analog signal of 2^n bit levels.
Dark current Is also know as Black Noise, is the signal charge the pixel develops in the absence of light. This charge is temperature sensitive, and normal in electrical image sensing devices.
Dark Current Uniformity Represents the variation of dark current from pixel to pixel. It is calculated as the rms. deviation from the average dark current for a fully vertically binned CCD.
Dark noise Dark current and any other noise accumulated in the absence of light.
Depth of field (DOF) The amount of distance between the nearest and farthest objects that appear in acceptably sharp focus in an image. Depth of field depends on the size of the aperture, the distance of the camera from the subject, and the focal length of the lens. The bigger the aperture, the greater the depth of field
Depth of focus The Depth of focus depends upon the numerical aperture (NA) as well as the magnification and is inversely proportional to both. The higher the magnification the shorter the depth of focus for any given numerical aperture. Also known as depth of field.
Digital Camera A camera equipped with an electronic photosensitive sensor. The digital pictures are stored directly in the camera's memory and can be used immediately on a computer.
Digital number (DN) A Value assigned to a pixel in a digital image. Also called counts.
Digital signal A signal in which information is carried in a limited number of different discrete states. The most fundamental and widely used form of digital signals are binary signals, in which one amplitude condition represents a binary digit 1, and another amplitude condition represents a binary digit 0. Digital-to-analog converter - See D/A converter.
Digitize To convert an image or signal into binary code. Visual images are digitized by scanning them and assigning a binary code to the resulting vector or raster graphics data.
Dynamic range refers to the varying gray values, or the spread of gray values, in an image that are possible reproduction. Am image with a high dynamic range suggests a wide number of gray levels and is normally associated with good contrast levels.
Exposure Exposure is the total amount of light allowed to fall on electronic sensor during the process of taking an image. Exposure is measured in exposure value (ev), with higher values denoting more light.
Exposure Time The time during which the sensor is exposed. In the case of a sensor with an electronic shutter, the shutter speed is the time for which the shutter is held open during the taking of an image and this may be shorter time than the actual frame period.

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