By Sudhakar Radhakrishnan

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Based on simulation, α and β are selected as 6 and π8 . 264/AVC encoder, the proposed method utilizes the prediction mode used in the four neighboring blocks (A, B, C and D). The weight of the prediction mode of each neighboring block is calculated and updated by adding the weight of same mode. Since, DC has no unified direction, if the neighboring mode is DC, the weight corresponding to this block is set to 0. The weight of each prediction mode is counted up and find out the mode with highest weight Wmax .

Case 2: As shown in Fig. 5, if all of the reference pixels of up and up-right blocks are same, vertical, diagonal-down-left, vertical-left, vertical-right and horizontal-down modes produce the same prediction value. That’s why, in the proposed method we have chosen only vertical prediction mode from this group. If variance σ 2 of the neighboring pixels of up and up-right blocks is less than the threshold T2 , four prediction modes (vertical, horizontal, diagonaldown-right and horizontal-up) are used.

For correctness, 13 reference pixels of a 4x4 block are denoted by P0 to P12 and pixels to be predicted are denoted by a to p. Mode 2 is called DC prediction in which all pixels (labelled a to p) are predicted by (P1+P2+P3+P4+P5+P6+P7+P8)/8. The remaining modes are defined according to the different directions as shown in Fig. 1 (b). 264/AVC using RD optimization mode decision scheme. The best mode is the one having minimum rate-distortion cost and this cost is expressed as J RD = SSD + λ ⋅ R (1) Where the SSD is the sum of squared difference between the original blocks S and the reconstructed block C, and it is expressed by 4 4 SSD = ∑∑ (sij − cij )2 (2) i =1 j =1 where sij and cij are the (i, j)th elements of the current original block S and the reconstructed block C.

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