Verfahren und Einrichtung zum Umwandeln der Farbkomponenten von Bildsignalen, Verfahren und Einrichtung zum Umwandeln des Kompressionsformates von Bildsignalen und System zum Erzeugen von Bildsignalen eines erforderlichen Kompressionsformates

摘要

In this picture signal converting apparatus, digital picture signals compressed in a DVC format are decoded to non-compressed picture signals of a 4:1:1 colour component type which are composed of colour difference signals and luminance signals. The colour difference signals of the 4:1:1 colour component type arranged in a matrix are removed on every other row to halve the number of colour difference signals in a y direction, and a colour difference signal is added to a position between each pair of colour difference signals adjacent to each other in an x direction to double the number of colour difference signals in the x direction. Therefore, converted colour difference signals of a 4:2:0 colour component type are produced from the colour difference signals. Values of the converted colour difference signals are determined according to values of the colour difference signals. Thereafter, the converted colour difference signals and the luminance signals of the non-compressed picture signals are combined to produce converted digital picture signals of the 4:2:0 colour component type. <IMAGE>