| 摘要 |
In case of performing an image process on an input image by selectively using plural conversion (halftone process) methods, a main object of the invention is to add, even if the plural conversion methods are switched and used, appropriate additional information according to each conversion method. To attain the object, there is provided an image process apparatus especially comprises an addition means for adding in a selected addition method the information to the image signal in a state that the added information is difficult to be perceived by human eyes. An another object is to add, even if the plural conversion methods are switched and used, the appropriate information according to a predetermined position or period. To attain the object, there is provided the apparatus especially comprises an addition means for adding the information in the above difficult-perceiving state according to a spatial frequency of a halftone cell corresponding to a halftone process method and an image-signal writing start position. A still another object is to add, even if the plural conversion methods are switched and used, the appropriate additional information suitable for all the conversion methods. To attain the object, there is provided the apparatus especially comprises an addition means for adding a pattern obtained by combining plural dots each composed of first and second areas of which longitudinal directions are different such that the pattern represents the additional information, to the input image signal in the above difficult-perceiving state.
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