Iris Color Correction Using Skin Tone and Peripheral Data
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Solution Overview
Problem
Existing iris color correction methods fail to accurately restore the original iris color after red-eye or gold-eye phenomena occur, leading to unnatural appearances, especially when the original iris color is lost or mismatched with the skin color-based corrections.
Innovation Solution
An iris color correction apparatus and program that identifies skin color, estimates the original iris color from peripheral pixels, and sets a correction reference color for natural iris color reproduction, allowing for automatic detection and correction of iris color abnormalities while maintaining pixel brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If skin color-based iris color estimation is used, then the iris color becomes natural relative to skin tone, but it does not match the person's actual original iris color
Solution Approach 1:
The patent applies partial action by using skin color-based estimation only for the central pupil region where red-eye occurs, while preserving the original iris color from peripheral regions. This allows the correction to be natural relative to skin tone in the affected area without losing the person's actual iris color information from unaffected areas.
Solution Approach 2:
The patent creates a composite correction approach by combining two different color sources: skin color-based estimated iris color for the central pupil region and original peripheral iris color for the surrounding areas. This composite method resolves the contradiction by using each color source where it is most effective.
2Object-affected harmful factors
If only the pupil is corrected while keeping the original iris color unchanged, then the red-eye phenomenon is corrected, but the corrected pupil color and original iris color do not match naturally
Solution Approach 1:
The patent applies local quality by making different parts of the iris region have different color characteristics. The central pupil region undergoes skin color-based correction to eliminate red-eye, while the peripheral iris region maintains its original color. This local differentiation resolves the color harmony issue by ensuring each region has the appropriate color treatment.
Solution Approach 2:
The patent segments the iris region into a central pupil area and a peripheral iris area, applying different correction strategies to each segment. The central region is corrected using skin color estimation while the peripheral region retains original color, achieving both red-eye correction and natural color transitions.
3Object-affected harmful factors
If the original iris color is completely replaced by skin color-based correction, then the red-eye is corrected, but the unique personal iris color characteristic is lost
Solution Approach 1:
The patent extracts and preserves the original iris color information from peripheral regions before it is lost in the central pupil area affected by red-eye. By identifying and saving this original color data, the system can use it to supplement the skin color-based correction, preventing complete loss of the person's unique iris color characteristics.
Solution Approach 2:
The patent discards the corrupted red-eye color in the central pupil region and recovers the original iris color information from peripheral areas. This recovery process allows the system to replace only the affected central region while maintaining the person's true iris color in the surrounding areas, preventing complete information loss.
Data Source
AI summary
An iris color correction apparatus has a skin color identification section which identifies the skin color of a photographed person in an inputted image, a skin correction color calculation section which obtains a skin correction color that is an iris color of said person that should be shown in said image based on the skin color identified by said skin color identification section, an original iris color calculation section which obtains an original iris color that is a representative color of a peripheral region of the iris of said photographed person from the color of pixels included in the peripheral region, a correction reference color setting section which acquires said obtained skin correction color and original iris color, and sets one of the skin correction color and the original iris color to be a correction reference color when correction is carried out, and a correction section which corrects the iris color of said photographed person based on said correction reference color.