Evaluation of Variances and Means of Blocks of Difference Between Two Blocks

These functions evaluate sum and variance of all elements in block.

• VarMeanDiff16x16
  Evaluates variances and means of four 8x8 blocks of difference between two 16x16 blocks.
• VarMeanDiff16x8
  Evaluates variances and means of two 8x8 blocks of difference between two 16x8 blocks.

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