Image processing method, image processing device, program, and image forming device
The image processing method addresses density unevenness in high-density areas by forming uniform density patches, measuring print element densities, and using slope-based extrapolation to accurately correct density errors, improving image quality.
JP7765248B2Active Publication Date: 2025-11-06FUJIFILM CORP
7 Cites 0 Cited by
Patent Information
- Application Number
- JP2021175547
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2021-10-27
- Publication Date
- 2025-11-06
- Estimated Expiration
- 2041-10-27
AI Technical Summary
Technical Problem
Existing image processing methods fail to accurately correct density unevenness in high-density areas due to insufficient consideration of density ranges outside the measured test pattern, leading to errors in high-density corrections.
Method used
An image processing method that forms a test image with uniform density patches, measures density values for each print element, and calculates correction values by predicting and extrapolating unobtained density measurements using a slope-based extrapolation method, ensuring accurate correction in high-density areas.
Benefits of technology
Improves the prediction accuracy of correction values to suppress density unevenness in high-density regions, enhancing the quality of printed images.
✦ Generated by Eureka AI based on patent content.
Abstract
To provide an image processing method, an image processing device, a program, and an image formation device which can improve prediction accuracy of a correction value suppressing density irregularity in a high density region.SOLUTION: An image processing method forms a test image for density measurement including a plurality of patches in which uniform concentration is set in a first direction at which a plurality of recording elements of a recording head are arranged; allows a processor to acquire density measurement values for recording elements of each patch; and calculates a correction value correcting output gradation for input gradation for each of the recording elements from the density measurement value. The processor predicts the density measurement value in a region with higher density than a first patch set at the highest density and performs extrapolation processing on the basis of the concentration measurement values of the first patch and a second patch set at the second highest density, when inclination of characteristics for inter-patch gradation between the first patch and the second patch is represented by u, inclination of characteristics between arbitrary two-point gradation in a gradation region of input gradation used for correction on the higher density than the first patch is represented by bu, the processor performs halftone processing satisfying 0≤b≤1.5.SELECTED DRAWING: Figure 14
Need to check novelty before this filing date? Find Prior Art