Verarbeitungssystem zur Geisterbildauslöschung eines Videosignales

Apparatus for filtering ghost signals from a video signal sequence comprises storage circuitry (14) for storing a representation of the reference signal, input circuitry (16) for inputting video signals from the video signal sequence, comparison circuitry (12) for comparing the stored representation of the reference signal with the reference signal received in the video signal sequence at said input circuitry thereby to detect ghosts, filter coefficient generating circuitry connected to said comparison circuitry to generate a frequency domain representation of filter coefficients dependent on ghost signals detected, a forward fourier transform pipeline (22) connected to said input circuitry (16) to form a frequency domain representation of data in the video signal sequence received by said input circuitry, product forming circuitry (35) for forming in the frequency domain a product of the filter coefficients with the frequency domain representation of the data in the video signal sequence, and an inverse fourier transform pipeline (45) connected to said product forming circuitry (35) for receiving said product and transforming it to provide an output in the time domain representing said video signal sequence from which detected ghost signals have been removed.