Print Apparatus Raster Operation Simplification
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Solution Overview
Problem
Conventional print apparatuses experience inefficiencies in raster operations due to excessive computation time resulting from the complexity of operations performed regardless of the destination image's attribute, leading to decreased rendering process efficiency.
Innovation Solution
A print method and apparatus that determine the attribute of the destination image and convert raster operations accordingly, simplifying operations when the destination image is in an initial or written state, specifically using a conversion map to reduce the complexity of operations by utilizing initial state values for black or white destinations, thereby reducing rendering time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If raster operations are performed using all 256 defined operations regardless of destination image attributes, then complete rendering coverage is achieved, but computation time increases excessively and rendering efficiency decreases
Solution Approach 1:
The patent changes the parameter of ROP selection based on destination image attributes. Instead of using all 256 ROPs regardless of destination state, the system selects from a reduced set of simplified operations (e.g., only 4 operations when destination is initial state, or only 2 operations when destination is white state). This parameter adaptation directly reduces computation time while maintaining rendering correctness.
Solution Approach 2:
The patent implements dynamic ROP selection based on destination image state. The system determines which ROPs to use at runtime based on the destination image's current state (initial, written, white, or black state), making the rendering process adaptive rather than static. This dynamic approach optimizes computation by matching the operation set to the actual rendering needs.
2Reliability
If all 256 raster operations are applied to every destination image, then rendering completeness is maintained, but processing complexity increases unnecessarily
Solution Approach 1:
The patent applies local quality by tailoring the ROP selection to the specific characteristics of each destination image state. Different destination states (initial, written, white, black) receive different ROP sets optimized for their specific requirements. This localized optimization maintains rendering completeness for each case while reducing overall processing complexity by avoiding unnecessary operations.
Solution Approach 2:
The patent performs preliminary determination of destination image attributes before selecting ROPs. By first identifying whether the destination is in initial state, written state, white state, or black state, the system prepares the appropriate simplified ROP set in advance. This preliminary classification action reduces the complexity of subsequent processing by eliminating the need to evaluate all 256 operations.
Data Source
AI summary
A print apparatus and print method are provided in which the efficiency of a raster operation is improved according to destination images. The print method includes the steps of extracting a source image, a halftone image and a destination image from an image to be printed, determining an attribute of the destination image and converting raster operations (ROPs) of the source image, the halftone image and the destination image in accordance with the determination result, and performing the converted ROPs. If the attribute of the destination image is a written state, the conversion of the ROPs may be omitted, and if the attribute of the destination image is an initial state, the ROPs may be converted to more simplified operations using an initial state value of the destination image. Accordingly, by determining an attribute of the destination image D in advance, before the ROPs are performed, and converting the ROPs to simplified ROPs, the time required for rendering a result can be reduced and an entire printing time can be reduced.