OUTLINE CORRECTING CIRCUIT

PURPOSE:To attain a well-balanced outline correction by gain adjusting an outline signal, non-linear converting it, correcting it into a proper level, and adding it to an input luminance signal as the outline signal of proper level amounts in both opposite and negative directions. CONSTITUTION:When the luminance signal is inputted, the output signal of an outline signal forming circuit 2 is shown by a figure (b). Also, an input luminance signal (a) is shown by a figure (c) by the output signal of a non-linear circuit 3. The gain of an outline signal (b) is adjusted by a gain control circuit 4 by the luminance signal to which the non-linear processing is applied, and outputted as an outline signal (d). That is, the outline signal which is subject to a level dependent effect is obtained, inputted to a non-linear conversion circuit 8, and non-linear converted. Therefore, the input outline signal is non- linear converted so that the gain of a negative polarity can be increased, and the gain of a positive polarity side can be decreased, and the excessive input outline signal is non-linear converted so that the gain can be compressed. Thus, an outline signal (f) which is well-balanced in both the opposite and negative directions can be obtain.