Patent ID: 8156169
Filing Date: 2012-04-10
Classification: G06T,H04N

Abstract:
1. A signal processing circuit for converting an input signal into a converted value within a predetermined variable range according to a predetermined conversion characteristic, the signal processing circuit comprising: a dividing unit that divides the variable range of the input signal into a plurality of ranges; a first counter unit that counts the number of times of inputting the input signal having any one of values from p to m, where the value m is a maximum value of values of input signals which are subject to the signal processing circuit and the value p is a value smaller than the value m and not a minimum value of the input signal, within a predetermined period; a second counter unit that counts the number of times of inputting the input signal having any one of values from the minimum value of values of input signals which are subject to the signal processing circuit to a value r within the predetermined period; a first specifying unit that specifies the conversion characteristic corresponding to input signals within a range of value p to value m; a second specifying unit that specifies the conversion characteristic corresponding to input signals within a range of the minimum value of values of input signals which are subject to the signal processing circuit to value r; an intermediate-range unit that specifies the conversion characteristic corresponding to input signals having the values r to p; a converting unit that converts the input signals by using the specified conversion characteristics; and an interpolation unit; wherein the first specifying unit comprises: wherein the second specifying unit comprises: