Artefact Detection and Correction

An artifact detector detects artifacts in a video sequence comprising interpolated frames generated by performing motion estimation. The detector comprises a pixel processor which processes pixel values in first and second input frames of the video sequence to identify respective blocks of pixels representing an image feature. A feature-matching module matches identified blocks in the first input frame with corresponding identified in the second input frame to determine matched block pairs. For each matched block pair, a feature-detector module: (i) identifies a block of an interpolated frame between the first and second input frames corresponding to the matched block pair, and (ii) characterizes the corresponding block of the interpolated frame as an artifact in dependence on a determination of whether said corresponding block does or does not represent the image feature. A corrector module corrects the interpolated frame based on the characterization of the blocks of the interpolated frame.