Re-quantization method image decoding method and equipment, and processor
A technology of inverse quantization and block images, applied in the direction of transmitting TV signals through single/parallel channels
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no. 1 approach
[0077] Figure 4 A structural block diagram of an image encoding device according to a first embodiment of the present invention is shown.
[0078]The image encoding apparatus 1 is an apparatus that outputs an encoded image signal Str obtained by performing compression encoding on an input image signal Vin, and then converting the encoded image signal into a bit stream such as a variable-length code. Such an image coding apparatus 1 includes a motion estimation unit ME, a motion compensation unit MC, a subtractor Sub, an orthogonal transformation unit T, a quantization unit Q, an inverse quantization unit IQ, an inverse orthogonal transformation unit IT, an adder Add, an image memory PicMem , a switch SW and a variable length coding unit VLC.
[0079] The image signal Vin is input to the subtractor Sub and the motion estimation unit ME. The subtractor Sub calculates a residual image between each image in the input image signal Vin and each predicted image, and outputs the ca...
no. 2 approach
[0165] A second embodiment of the present invention is described below.
[0166]
[0167] In order to reduce computational complexity, it is desirable to use only multiplication and shift operations for quantization with the q-matrix. In other words, computationally expensive division operations should actually be avoided. The proposed integer-based division-free non-uniform high-efficiency quantization method can generally be applied to block transformation and quantization of any size in video coding systems.
[0168] exist Figure 16A and 16B In , the quantization and de-quantization (de-quantization) operations of transform coefficients in the case where only multiplication and shift operations are used are described. For a given QP, the values of S1 and S2 are fixed for all coefficients, while the values of Q1 and Q2 depend on the QP value and coefficient position (see Ref.1: Joint Video Team of ISO / IEC MPEG & ITU-T VCEG ( JVT), "Draft of ITU-T Recommendation an...
no. 3 approach
[0193] A third embodiment of the present invention is described below.
[0194] In video coding systems, a set of quantization matrices is defined by default such that a decoder implements the quantization scheme and matrices. They are used for decoding when the encoded bitstream uses a quantization weighting scheme. Users can define their own quantization matrices and send them to the decoder. This innovation will dictate how the quantization matrix is sent to the decoder.
[0195] The innovation also defines the transform selection among various coding mode selections.
[0196] In the quantization weighting scheme, we describe the following main features:
[0197] 1. Specification of a division-free quantization weighting scheme based entirely on integers, requiring only 16-bit memory operations at the decoder, which introduces no increase in complexity compared to uniform quantization schemes.
[0198] 2. The proposed non-uniform quantization scheme is based on an 8×8...
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