Patent ID: 8401074

Claim:
A quantization method for obtaining quantized orthogonal transform coefficients using a quantization unit, by quantizing orthogonal transform coefficients, said method comprising: obtaining, using the quantization unit, a weighting matrix; obtaining, using the quantization unit, a quantization parameter; calculating, using the quantization unit, a level scale values by multiplying a value, which is calculated from a component in i-th row and j-th column in the weighting matrix, and a normalization value, which is corresponding to the position of the component in 1-th row and j-th column in the weighting matrix and a remainder of the quantization parameter divided by an integer equal to or greater than 2; multiplying, using the quantization unit, an orthogonal transform coefficient and the level scale value; and shifting, using the quantization unit, a product resulted from the multiplication by the number of bits in accordance with the quantization parameter so as to obtain a quantized orthogonal transform coefficient, wherein a computer is configured to perform the above steps to obtain the quantized orthogonal transform coefficient.