BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
A general architecture that implements the various feature of the invention will now be described with reference to the drawings. The drawings and the associated descriptions are provided to illustrate embodiments of the invention and not to limit the scope of the invention.
FIG. 1 is a block diagram that shows the structure of a subtitle detection apparatus 10A according to a first embodiment of the present invention;
FIG. 2A and FIG. 2B show examples of a subtitle in a field signal;
FIG. 3 shows a dynamic range calculation circuit 16A as a first embodiment of a dynamic range calculation circuit 16;
FIG. 4 shows a dynamic range calculation circuit 16B as a second embodiment of the dynamic range calculation circuit 16;
FIG. 5 is a block diagram that shows the structure of a subtitle detection apparatus 10B according to a second embodiment of the present invention;
FIG. 6 is a block diagram that shows the structure of a subtitle detection apparatus 10C according to a third embodiment of the present invention;
FIG. 7 is a block diagram that shows the structure of a subtitle detection apparatus 10D according to a fourth embodiment of the present invention;
FIG. 8 shows an example of a progressive-scan apparatus 40 to which the present invention is applied;
FIG. 9A to FIG. 9C illustrate how an interlaced-scan 2-3 pull-down signal is delayed;
FIG. 10 shows an interlaced-scan 2-2 pull-down signal as another system of the pull-down signal;
FIG. 11 shows a first embodiment of a pull-down signal detection circuit 47 according to the invention;
FIG. 12A to FIG. 12E show an example of determination results of an inter-field correlation and an inter-frame correlation of a 2-3 pull-down signal; and
FIG. 13 is a block diagram showing the structure of a second embodiment of the pull-down signal detection circuit 47.