| 摘要 |
The images from an image generator (31) are analysed in an analysis circuit (1) which determines the contours thereof, according to the image portions of a predetermined thickness. The analysis circuit (1) controls a switch (2) which makes it possible to substitute for the portions of images from the generator (31), with the exception of the portions of contours, portions of images from a first scene background (V2) and, if appropriate, for the portions of contours, portions of images from a second scene background (V3). The invention applies to image mixers for television transmission or advertising films, for example . <IMAGE>
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