Patent ID: 8218200
Filing Date: 2012-07-10
Classification: H04N

Abstract:
1. An image processing system adapted to input a sequence of image drawing objects each respectively including a set of data on pixels of a cell of color image and a raster operation code, hold a set of pixel data of an arbitrary object to be processed as a source for a raster operation in accordance with an associated raster operation code, and hold a set of pixel data of an object to be output as a destination, the system comprising: a determiner configured to determine an n-th input object (n being an integer) to be a mask, as the n-th input object fills a first criterion as requisite for the n-th input object to be determined as a mask, and an n+1-th input object fills a second criterion as sufficient for a presumption for the n+1-th input object to be masked by the n-th input object; a converter configured for a color conversion to convert a data of a pixel of black in an object as determined to be a mask into a pixel data of composite black, and convert a data of a pixel of black in an object as not determined to be any mask into a pixel data of composite black or real black; and a processor configured to operate and process as a source a set of pixel data of an object as color-converted.