Abstract: In a digital image processing system, an A/D converter digitizes an input analog 2-field (i.e. 525 lines NTSC) video signal into first and second digital video field data components of a digital video frame, and the data of the first and second fields is stored in an image memory. Under control command, the first digital video field data is read-out of the image memory, switched to a data output and D/A converted into a first analog video field for supplying the first field component of an analog video still frame, and simultaneously the first digital video field data is also stored in a field memory. The second digital video field data is then read-out of the image memory into one input of an adder while the first digital video field data is read-out of the field memory into another input of the adder, whereby the first and second digital field data is digitally summed, then passed through a divider to provide the digital average of the data of the first and second digital video fields.