| 摘要 |
<p>A system is disclosed for automatically generating stencil signals from a characteristic (for example luminance) of stored video image picture point signals. First and second control values are selected, and a first type of stencil signal (for example representing no stencil) is generated for all image signals having a luminance value below the first control value and a second type of stencil signal (for example representing full stencil) is generated for all image signals having a luminance value above the second control value.</p> |
