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Abstract

N pieces of quantized data are generated by quantizing video signals in quantizing widths proportional to N temporary quantizing parameters Q(i). N temporary coded bit streams S(i) are generated by variable length coding the N pieces of quantized data. A code quantity B(i, j) of the temporary coded bit streams S(i) is measured in a second specific period t(j) which is one of n periods divided from a first specific period T. A function f(q, j) is estimated by relating a quantizing parameter q having continuous values and a code quantity b(j) of coded bit streams in the second specific period t(j) with the function of b(j)=f(q, J), by using the temporary quantizing parameter Q(i) and the code quantity B(i, j). An assigned code quantity bt(j) to be assigned to the second specific period t(j) is determined so that a code quantity of the coded bit streams in the first specific period T may be equal to a specified assigned code quantity BT assigned in the first specific period T. The video signals in the second specific period t(j) are quantized again by using the assigned code quantity bt(j) to obtain re-quantized data, and an output coded bit stream is obtained by variable length coding the requantized data.

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