Video decoding device and method thereof for combining inverse quantization and inverse zig-zag scan

The present invention relates to a video decoding device and method thereof for combining inverse quantization and inverse zig-zag scan. A receiving unit comprising a counter receives at least a pixel data, and accumulates a count value as an index parameter of the pixel data. Then, a processing unit captures a quantization parameter and a storage address based on the index parameter, so as to use the quantization parameter for inversely quantizing the pixel data, to generate an inverse quantization value, and to store the value of inverse quantization into the storage address.