Signalverarbeitungsverfahren und -schaltung zur Formatumwandlung eines Bildsignals

摘要

In order to carry out a format conversion or a scaling processing on a picture signal by a memory of small capacity, interlace scanning picture signals are converted into progressive scanning picture signals by interpolation by using an IP converter 1 and a multiple-scan converter 3. Scaling processing by expansion and compression in the horizontal direction is firstly performed by using a horizontal scaling unit 5, processing by expansion, compression, frame rate conversion, synchronisation and the like are secondly performed by using a vertical scaling unit 6 and commonly using memories used in scaling processing in the vertical direction, and finally, colour space conversion or inverse gamma processing is performed by using a picture quality improving unit 8 thereby converting the picture signals into picture signals S6 having a predetermined format.