Image processing apparatus and program therefor
AssigneeSeiko Epson Corporation
InventorMasatoshi Matsuhira
Life of this patent
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Abstract
An advantage of the invention is to provide an image processing apparatus and a medium therefor, which enable shortening of processing time necessary for performing the whole color conversion in the case where only one of LUTs used for the color conversion can be stored in a storage means having a high access rate. In the image processing apparatus, for image data including a plurality of pixels and being a target for a color conversion, when performing the color conversion of the image data, a value of a counter for pictures, which indicates a predicted total number of references to an LUT for pictures, and a value of a counter for texts, which indicates a predicted total number of references to an LUT for texts, are derived.
Claims7
An image processing apparatus comprising:
- a first storage section configured to, as look-up tables (LUTs) for being referenced when performing a color conversion from a first color space to a second color space, store an LUT for pictures, which is appropriate to performing the color conversion of a picture pixel that is a pixel included in an area representing a picture, and an LUT for texts, which is appropriate to performing the color conversion of a text pixel that is a pixel included in an area representing a text;
- a second storage section configured to have a storage capacity that is larger than each of a storage size of the LUT for pictures and a storage size of the LUT for texts, and further, is smaller than a storage size resulting from summing the storage size of the LUT for pictures and the storage size of the LUT for texts, and have an access rate higher than an access rate of the first storage section;
- a total-number-of-references prediction section configured to, for image data including a plurality of pixels and being a target for the color conversion, derive a predicted total number of references to the LUT for pictures and a predicted total number of references to the LUT for texts when performing the color conversion of the image data;
- an LUT-to-be-stored determination section configured to determine the LUT for pictures or the LUT for texts, whichever has a larger total number of references, as an LUT to be stored in the second storage section;
- and
- a storage section configured to, from the first storage section, read out the LUT, that is, either of the LUT for pictures or the LUT for texts, which has been determined by the LUT-to-be-stored determination section, and store the read-out LUT in the second storage section.
Dependencies are inferred from the claim text.