Image Forming Device Mono Output Validation
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Solution Overview
Problem
Image forming devices often incorrectly determine images as color when they should be printed in mono mode, leading to increased printing time due to unnecessary color printing, as they mistakenly recognize RGB values in empty spaces or objects not meant to be printed.
Innovation Solution
An image forming device and method that detect output objects with color values and examine their validity using chrominance component comparisons and Raster Operation (ROP) calculations to determine if an object is actually to be printed, outputting as a mono object if not valid, thereby reducing printing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the image forming device examines RGB values of brush or pen to determine color images, then color printing is performed, but printing time increases due to unnecessary color mode operation on mono images
Solution Approach 1:
The patent applies preliminary action by performing validity examination of output objects before determining printing mode. The controller checks whether output objects are actually expressed on the medium using ROP calculation results, and only then decides whether to use color or mono printing mode. This preliminary validation prevents unnecessary color printing operations.
Solution Approach 2:
The patent introduces an intermediary validation mechanism that acts between the RGB value detection and the printing mode selection. The validity examination of output objects serves as an intermediary step that filters out false color detections, allowing accurate determination of whether color printing is actually needed.
2Measurement precision
If the image forming device examines completely rendered page data to determine mono data, then detection precision increases, but print speed decreases
Solution Approach 1:
The patent performs preliminary examination of output object validity using ROP calculation results before completing full rendering for printing mode determination. This allows the system to make accurate mono/color mode decisions based on validated output objects without waiting for complete page rendering, thus maintaining both precision and speed.
Solution Approach 2:
The patent segments the page rendering process by examining output object validity independently through ROP calculation results. Instead of waiting for complete page rendering, the system validates individual output objects and uses this segmented information to determine printing mode, improving overall processing efficiency.
3Reliability
If the image forming device performs color printing for objects with RGB values, then color accuracy is maintained, but printing time increases due to four separate printing operations
Solution Approach 1:
The patent introduces an intermediary validity examination step that filters out output objects not actually expressed on the medium. This intermediary validation ensures that color printing is performed only when necessary, maintaining color accuracy for valid color objects while avoiding unnecessary color printing operations for invalid objects.
Solution Approach 2:
The patent dynamically changes the printing mode parameter (color or mono) based on the validity examination results of output objects. When output objects are determined to be invalid or not actually expressed on the medium, the system switches to mono printing mode, reducing printing time while maintaining color accuracy for valid color objects.
Data Source
AI summary
An image forming method which examines validity of an output object using an ROP, for example, and determines whether the output object is printed in a color mode or in a mono mode, is provided. The method includes detecting an output object having a color value from among output objects constituting a mono page, examining the validity of the detected output object, and outputting the detected output object as a mono object if the output object is determined not to be valid. Accordingly, if a mono image having an RGB value is recognized as a color object but is data not to be output on paper or media, the image is recognized as data which are not necessary to be output using color toner, so that only black toner is used. Accordingly, the printing rate increases, and efficiency of processing a printing is enhanced.