Method of generating a de-interlacing filter and image processing apparatus

An image processing apparatus comprising:

• a pixel array configured to receive electromagnetic radiation and measure electrical signals generated by each pixel of the pixel array in response to receipt of the electromagnetic radiation, the pixel array comprising a pixel interlacing pattern, the pixel interlacing pattern identifying a first plurality of pixels and a second plurality of pixels to be read during a first measurement subframe of a plurality of measurement subframes and a second measurement subframe of the plurality of measurement subframes of an interlacing pixel scan sequence, respectively;
• and
• a signal processing circuit configured to analyse the pixel array and in response to analyzing the pixel array to generate an n-state representational map of the pixel interlacing pattern distinguishing between the first plurality of pixels and the second plurality of pixels by assigning to each pixel position in respect of the pixel array a value designating a measurement subframe of the interlacing pixel scan sequence, where n is a number of measurement subframes;
• wherein
• the signal processing circuit is configured to translate the n-state representational map of the pixel interlacing pattern to a spatial frequency domain, thereby generating a spatial frequency domain representation of the n-state representational map of the pixel interlacing pattern;
• the signal processing circuit is configured to remove a DC signal component from the spatial frequency domain representation of the n-state representational map of the pixel interlacing pattern, thereby generating a DC-less spatial frequency domain representation;
• the signal processing circuit is configured to select a kernel filter configured to blur;
• and
• the signal processing circuit is configured to convolve the DC-less spatial frequency domain representation with the selected kernel filter.