HDTV(High Definition TV), is a generic term associated with a large family of systems to shoot and display TV images of better quality compared to what traditionally was possible to get on TV at home, referred to as the SDTV (Standard Definition TV) . Although commonly the definition of images is related to the quality of the same, technically it is not: the definition is an objective property, according to which television sets have been made for decades and television programs have been broadcast. Technically, definition is determined by the number of elementary points into which the image is decomposed, so it is a feature of the shooting process. The definition referred to the quality of an image is also measurable as number of pixels relative to the size. Resolution is rather the degree of detail with which the screen image is rendered, i.e. the number of lines and the amount of points placeable on each line, so it is a feature of the visualization process.
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