Method for carrying out integer approximation of transform coefficients and coder and decoder

摘要

The range of limit values ​​are set to obtain the cosine transform coefficients of the integer approximation run.; Coefficient of the base vector for the sub-matrix is, taking into account the orthogonality condition, it is selected in such a manner that the sum of the squares of the coefficients provided to the square of the constant component coefficients. The coefficients of the variable components from the coefficient is derived.; Through these measures, the advantage that the same normalization factor and the quantization can be used at the time of quantizing and normalization is provided for all the coefficients.; Coefficient of approximately constant, cosine transform coefficients, the coefficients of the base vector, the variable component