Digital Image Fundamentals

SAMPLING AND QUANTIZATION

• In common practice, the TV raster scanning mechanism is used to break the given image into a set of rows (scan lines).

• An analog-to-digital converter (ADC) is then use to sample each row into a set of discrete values.

• Typically, digitizing frame buffers convert a given image into an array of 512x480 pixels, each pixel having an integral value between 0 (black) and 255 (white).

• Charge-coupled device (CCD) arrays are available in 2D arrays up to 2048 x 2048 and 1D arrays with 4096 or more pixels.

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