Inverse quantization device for video decoding and implementation method thereof

The invention discloses an inverse quantization device for video decoding and an implementation method thereof in the technical field of digital video. The device comprises a control module, an inverse scanning module, an inverse Hadamard transform module, a parameter calculating module, a table look-up module and an operating module, wherein the control module transmits the received residual data, parameter information and control signal to the inverse scanning module, the inverse Hadamard transform module, the table look-up module and the parameter calculating module; the inverse scanning module outputs a base address corresponding to the read residual data; the inverse Hadamard transform module outputs direct current residual data transformed by inverse Hadamard; the table look-up module outputs the incrementation parameter and the displacement parameter corresponding to the read residual data; the parameter calculating module calculates the weighting parameter corresponding to the residual data according