| 摘要 |
An image composition apparatus with an image converting function is provided to convert images so as for the image types of two image data to be identical, determine color by image frame represented by corresponding image data to which transparency is applied between the two image data, and compose the two image data while applying transparency to the image data, thereby reducing the number of accesses to a memory and an access time and reducing time required to convert and compose two images. A first image type converter(110) converts the image type of first input image data corresponding to a first image in response to a first control signal, or bypasses the first input image data to output first output image data. A second image type converter(120) converts the image type of second input image data corresponding to a second image in response to a second control signal, or bypasses the second input image data to output second output image data. A color determination unit(130) outputs actual transparency data included into the first input image data in response to a third control signal, or determines color by image frame of the first image based on the first output image data, and selects and outputs one of plural reference transparency data according to a determination result. A composition unit(140) adjusts the transparency of the first output image data on the basis of the actual transparency data or the selected reference transparency data, composes the first output image data and the second output image data, and outputs composition image data to an external device(200). The image type of the first output image data and the image type of the second output image data are identical. The composition unit has an image converting function serially operated as the first and second image type converters are operated.
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