In the last MPEG meeting, MPEG issued a Call for Evidence (CfE) on High-performance Video Coding (HVC). Nine responses to the CfE are received in this meeting (89th MPEG London). Those reponse proposals adopt typical coding tools in KTA, such as adaptive loop filter (ALF), extended macroblock size (EMS), larger transform size (LTS), internal bit depth increasing [...]
Permanent Link: Current Status of HVC (High-Performance Video Coding) in MPEG
4. Rate-Distortion Optimized Quantization Previously, adaptive rounding was proposed to improve quantization, which captures the statistics of the incoming residual signal and adjusts the rounding offsets accordingly. However, the adaptive rounding quantization is still based on the criterion which minimizes the mean-squared quantization error between the original signal and the quantization reconstructed signal. From the [...]
Permanent Link: Quantization Techniques in JM/KTA – Part 4
3. Adaptive Rounding Encoding Technique using an Equal Expected-Value Rule As discussed above, if the input p.d.f. is Laplacian distributed and if we can estimate λ, then the optimal f can be found analytically. But, usually the estimate of input p.d.f. is not available, then, how to select the rounding offset f? In order to [...]
Permanent Link: Quantization Techniques in JM/KTA – Part 3
2. Principle of H.264/AVC Normal Quantization Scheme 2.1. Scalar dead-zone quantization In this section the principle of H.264/AVC normal quantization scheme is described in a generalized form. A scalar quantizer for input signal W can be decomposed into a function Z=C[W] called a classification rule that selects an integer-valued class identifier called the quantization index [...]
Permanent Link: Quantization Techniques in JM/KTA – Part 2
1. Overview Currently most image and video coding systems and standards, such as MPEG-1/2 and H264/AVC, use transform-based techniques followed by quantization and entropy coding. The key idea is that transforms de-correlate the signal and compact the energy of a block into a few coefficients, which still represent the signal rather accurately after quantization and [...]
Permanent Link: Quantization Techniques in JM/KTA – Part 1
The technique of 1/8-pel interpolation [AD09] was proposed for motion-compensated prediction (MCP) and adopted in KTA software. Three types of interpolation filters are used for 1/2-, 1/4-, and 1/8-pel sub positions, respectively. [-3, 12, -39, 158, 158, -39, 12, -3]/256 for 1/2-pel sub positions. [-3, 12, -37, 229, 71, -21, 6, -1]/256 and [-1, 6, -21, [...]
Permanent Link: R-D Performance of 1/8-pel MCP on HD Sequences
In the Geneva meeting held in Feb. 2009, a proposal with the title “Video Coding Using Extended Block Sizes” was adopted by KTA, where the MB size is extended up to 64×64 and the motion partitions are scaled accordingly. At the same time, a 2D order-16 transform was also proposed for transforming the residual blocks with [...]
Permanent Link: Transform Error Introduced by Non-orthogonality
The latest KTA software is JM11KTA2.3, which integrates the coding tools adopted in the Geneva meeting (Jan. 2009) and before.  Inter prediction Adaptive interpolation filter (AIF) 2-D non-separable AIF (AD08, AE16) Separable AIF (COM16-C219, AG10) Directional AIF (DAIF) (AG21, AG22, AH17, AH18) Enhanced DAIF (E-DAIF) (AI12, COM16-C126) Enhanced DAIF 2 (E-DAIF2) (COM16-C125) Enhanced AIF (EAIF) (COM16-C464, [...]
Permanent Link: KTA Software JM11KTA2.3