The workspace – what you need to know before starting to digitize with a cameraA. Definitions and explanationsTo understand and master the Gemini Photo Digitizer functions we must clearly define end explain the technical terms.PictureA picture represents photography of some patterns made with a camera or a scanner.Picture resolutionResolution refers to the number of pixels in an image. Resolution is sometimes identified by the width and height of the image as well as the total number of pixels in the image. For example, an image that is 2048 pixels wide and 1536 pixels high (2048X1536) contains (multiply) 3,145,728 pixels (or 3.1 Megapixels). You could call it a 2048X1536 or a 3.1 Megapixel image. As the megapixels in the pickup device in your camera increase so does the possible maximum size image you can produce. This means that a 5 megapixel camera is capable of capturing a larger image than a 3 megapixel camera.Sensor SizeSensor size determines how much noise a sensor produces, and noise is one of the main limitations on the performance of a digital camera. Noise in a digital image is manifested as speckles all over.It is recommended to use camera with Sensor Size” between 1 / 2.5” and 1 / 1.6”.Camera ExposureExposure is the amount of light which falls upon the sensor of a digital camera. Shutter speed and aperture are adjusted to achieve optimal exposure of a scene. Most digital cameras offer a variety of exposure modes from fully- automatic to semi-automatic to full manual mode.
Camera ISO
ISO is the number indicating a digital camera sensors sensitivity to light. The higher the sensitivity, the less light is needed to make an exposure. Shooting at a lower ISO number requires more light than shooting at a higher number. Lower numbers result in images with the least visible noise, which is desirable.
Camera flash
Many digital cameras have several flash modes to choose from. A built-in flash is small and not very powerful so whichever mode you use, make sure to stay within the specified flash range.
Camera zoom
A digital camera, usually, can make two types of zoom: Optical zoom and Digital zoom.
Optical zoom
Optical zoom magnifies the size of an image by adjusting the lens. Unlike digital zoom, optical zoom enlarges the subject without sacrificing resolution.
All cameras have something called a focal length. This is true even for a camera without a zoom lens. The focal length is the distance from the optical center of the lens to the camera's focal point. For digital cameras the focal point is located on the camera's sensor. The position of the lens changes as you zoom in and out. As you zoom in the focal length increases. As you zoom out the focal length decreases.
Digital zoom
Digital zoom is completely different to optical zoom. Rather than using the lens to zoom, digital zoom is carried out by software inside the camera. Concisely the software enlarges part of the image to give the impression of zooming in. An element of guesswork is involved in the process and leads to a decrease in quality. Therefore optical zoom is considered far superior to digital zoom.
It is not recommended to use digital zoom when you capture pictures for digitizing.
Piece
A piece is a detected contour with a specific shape and technical elements as: notches, grain axis, text axes, internal points, piece name. The piece contour is formed by points with specific coordinates; the points are connected by lines and curves.
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