Pixel Comparison

A processing unit configured to classify a first pixel in a first group of neighbouring pixels as acceptable or not acceptable with respect to a second pixel in a second group of neighbouring pixels, the processing unit being configured to:

• determine whether a difference between the first pixel and the second pixel is greater than a threshold difference;
• in response to determining that the difference between the first pixel and the second pixel is greater than the threshold difference, analyse the pixels in at least one of the first and second groups of neighbouring pixels to determine whether the difference is indicative of the first pixel being erroneous;
• classify the first pixel as acceptable or not acceptable based on whether the difference is determined to be indicative of the first pixel being erroneous;
• and
• output the classification of the first pixel.

A computer readable storage medium having stored thereon computer readable code configured to cause at least one processor to classify a first pixel in a first group of neighbouring pixels as acceptable or not acceptable with respect to a second pixel in a second group of neighbouring pixels to be performed when the code is run, by:

• determining whether a difference between the first pixel and the second pixel is greater than a threshold difference;
• in response to determining that the difference between the first pixel and the second pixel is greater than the threshold difference, analysing the pixels in at least one of the first and second groups of neighbouring pixels to determine whether the difference is indicative of the first pixel being erroneous;
• classifying the first pixel as acceptable or not acceptable based on whether the difference is determined to be indicative of the first pixel being erroneous;
• and
• outputting the classification of the first pixel.