A method and apparatus are disclosed for filtering ghost signals from a video signal sequence. Storage circuitry stores a representation of a reference signal, Input circuitry inputs video signals from the video signal sequence. Comparison circuitry compares the stored representation of the reference signal with a reference signal received in the video signal sequence at the input circuitry, thereby to detect ghosts. Filter coefficient generating circuitry is connected to the comparison circuitry to generate a frequency domain representation of filter coefficients dependent on ghost signals detected. A forward Fourier transform pipeline is connected to the input circuitry to form a frequency domain representation of data in the video signal sequence received by the input circuitry. Product forming circuitry forms in the frequency domain a product of the filter coefficients with the frequency domain representation of the data in the video signal sequence. An inverse Fourier transform pipeline is connected to the product forming circuitry for receiving the product and transforming it to provide an output in the time domain representing the video signal sequence from which detected ghost signals have been removed.