Image Processing Device Selective Bit Width Adjustment
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Solution Overview
Problem
Conventional image processing methods for color printing face challenges in accurately converting RGB values to CMY values, leading to rounding errors and reduced image quality due to limited bit precision, especially in printers with limited memory capacity, which affects processing speed and image reproducibility.
Innovation Solution
An image processing device and program that selectively increase the bit width of CMY values based on predetermined criteria, specifically for cyan and magenta colors at low densities, to enhance bit precision and reduce tone jump, thereby improving image quality and processing speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of bits in CMY values is increased to reduce rounding errors and improve color reproducibility, then manufacturing precision is improved, but device complexity and processing time increase
Solution Approach 1:
The patent applies local quality by selectively increasing the bit width of CMY values only for specific color components (cyan and magenta) and only under specific conditions (when density is below a threshold), rather than uniformly increasing bit width for all values. This localized approach improves color reproducibility where needed while avoiding unnecessary processing complexity elsewhere.
Solution Approach 2:
The patent changes the parameter of bit width dynamically based on the density value of each CMY component. When the density is below a predetermined threshold, the bit width is increased from 8 bits to 12 bits to reduce rounding errors. This parameter change optimizes the balance between precision and processing efficiency.
2Manufacturing precision
If the number of bits in CMY values is increased to improve tone reproducibility, then manufacturing precision is improved, but processing speed decreases
Solution Approach 1:
The patent applies local quality by selectively increasing the bit width of CMY values only for specific color components (cyan and magenta) and only under specific conditions (when density is below a threshold), rather than uniformly increasing bit width for all values. This localized approach improves tone reproducibility where needed while avoiding unnecessary processing complexity elsewhere.
Solution Approach 2:
The patent changes the parameter of bit width dynamically based on the density value of each CMY component. When the density is below a predetermined threshold, the bit width is increased from 8 bits to 12 bits to reduce rounding errors. This parameter change optimizes the balance between precision and processing efficiency.
3Manufacturing precision
If the number of bits in CMY values is increased to reduce rounding errors, then manufacturing precision is improved, but memory capacity requirements increase
Solution Approach 1:
The patent applies local quality by selectively increasing the bit width of CMY values only for specific color components (cyan and magenta) and only under specific conditions (when density is below a threshold), rather than uniformly increasing bit width for all values. This localized approach improves calculation accuracy where needed while minimizing the additional memory capacity required.
Solution Approach 2:
The patent changes the parameter of bit width dynamically based on the density value of each CMY component. When the density is below a predetermined threshold, the bit width is increased from 8 bits to 12 bits to reduce rounding errors. This parameter change optimizes the balance between precision and processing efficiency.
Data Source
AI summary
A printing unit prints an image based on print data. The printing unit has characteristics. An input-color-data storing portion stores input color data indicative of colors of inputted image data. The input color data have color component values of a first color group. A print-data generating portion converts the color component values of the first color group stored in the input-color-data storing portion into color component values of a second color group, thereby generating pre-correction print data having a predetermined bit width. A correcting portion converts the pre-correction print data into post-correction print data that is adapted to the characteristics of the printing unit. The correcting portion includes a bit-width correcting portion that generates the post-correction print data having a bit width greater than the predetermined bit width. The bit-width correcting portion selectively increases the bit width based on predetermined criteria.