A stereoscopic video temporal frame offset measurement system characterised by comprising signature generator comprising a first input configured to receive a left image sequence and a second input configured to receive a right image sequence, said left image sequence and right image sequence representing a stereoscopic video signal; means for cross-correlating signature curves for each of the left image sequence and the right image sequence to determine a temporal frame offset between the left image sequence and right image sequence; and an output configured to provide an output signal comprising the temporal frame offset between the left image sequence and the right image sequence; wherein the signature generator comprises: means for delaying each image sequence by a specified number of frames/fields to produce respective delayed image sequences; means for cross-correlating sequential frames/fields of each of the left image sequence and right image sequence with its corresponding delayed image sequence to produce respective cross-correlation coefficients; means for differentiating sequential cross-correlation coefficients within each of the left image sequence and right image sequence to produce a normalized first-past difference between the sequential cross-correlation coefficients for each of the left image sequence and right image sequence as the respective signature curve for each of the left image sequence and right image sequence; and wherein the means for cross-correlating the signature curves comprises: a first-in, first-out buffer for each of the signature curves, the first-in, first- out buffer having as an input the signature curve and having an output; and a microprocessor system having as inputs the outputs from the first-in, first-out buffers and providing as an output the temporal frame offset, the microprocessor system performing a sliding cross-correlation between its inputs to produce the temporal frame offset. means for delaying each image sequence by a specified number of frames/fields to produce respective delayed image sequences; means for cross-correlating sequential frames/fields of each of the left image sequence and right image sequence with its corresponding delayed image sequence to produce respective cross-correlation coefficients; means for differentiating sequential cross-correlation coefficients within each of the left image sequence and right image sequence to produce a normalized first-past difference between the sequential cross-correlation coefficients for each of the left image sequence and right image sequence as the respective signature curve for each of the left image sequence and right image sequence; and wherein the means for cross-correlating the signature curves comprises: a first-in, first-out buffer for each of the signature curves, the first-in, first- out buffer having as an input the signature curve and having an output; and a microprocessor system having as inputs the outputs from the first-in, first-out buffers and providing as an output the temporal frame offset, the microprocessor system performing a sliding cross-correlation between its inputs to produce the temporal frame offset. a first-in, first-out buffer for each of the signature curves, the first-in, first- out buffer having as an input the signature curve and having an output; and a microprocessor system having as inputs the outputs from the first-in, first-out buffers and providing as an output the temporal frame offset, the microprocessor system performing a sliding cross-correlation between its inputs to produce the temporal frame offset.