Intrinsic Image Color Differentiation via Illumination Subtraction
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Solution Overview
Problem
Existing methods for intrinsic imaging struggle to enhance and map intrinsic images effectively by eliminating selective portions of illumination, particularly in fields like histopathology where H&E stains have limited color differentiation due to overpowering illumination, leading to a long learning curve and high variability in diagnostic accuracy.
Innovation Solution
The method involves manipulating exposure settings of focused and defocused/diffused images to reveal specific aspects in intrinsic images, using the subtraction of defocused/diffused images from focused images to enhance contrast, resolution, and color differentiation, without relying on spectral filters or dichroic mirrors, by controlling exposure parameters such as duration, F-stop, and ISO sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If spectral filters or dichroic mirrors are used to eliminate selective portions of illumination, then color differentiation is improved, but device complexity increases
Solution Approach 1:
The patent extracts the illumination component from the intrinsic image by subtracting a defocused/diffused image (representing illumination) from the focused image. This removes the overpowering illumination that masks the subtle color differences in H&E stains, thereby improving color differentiation without requiring spectral filters or dichroic mirrors.
Solution Approach 2:
The patent introduces a translucent diffusing material as an intermediary between the camera and the field of view to create the defocused/diffused image. This intermediary enables the separation of illumination from intrinsic image data without requiring complex optical filters, thus improving color differentiation while maintaining device simplicity.
2Illumination intensity
If illumination intensity is increased to improve image brightness, then brightness is improved, but color differentiation deteriorates due to overpowering illumination
Solution Approach 1:
The patent converts the harmful effect of overpowering illumination into a benefit by using the illumination-rich defocused/diffused image as a subtraction target. By subtracting this illumination component from the focused image, the method removes the masking effect of bright illumination and reveals the subtle color differences in stained tissues, thereby improving color differentiation while maintaining adequate brightness.
Solution Approach 2:
The patent applies preliminary anti-action by subtracting the illumination component (captured in the defocused/diffused image) from the focused image before analysis. This pre-processing step counteracts the overpowering illumination effect, enabling better color differentiation without reducing the overall brightness of the final image.
3Measurement precision
If multiple image processing steps are added to enhance intrinsic images, then color differentiation is improved, but processing time increases
Solution Approach 1:
The patent merges the illumination removal and intrinsic image enhancement steps into a single subtraction operation: focused image minus defocused/diffused image. This combined approach achieves both illumination elimination and color differentiation enhancement in one processing step, avoiding the need for multiple separate processing stages and thereby reducing processing time.
Solution Approach 2:
The patent performs preliminary action by capturing both the focused image and the defocused/diffused image simultaneously or in close succession under the same illumination conditions. This pre-capture of the illumination component enables efficient single-step subtraction processing, avoiding the need for iterative or multi-stage processing and thus reducing overall processing time.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly improves contrast, resolution, and color differentiation in intrinsic images, allowing for better feature enhancement and reduced variability in diagnostic accuracy by shifting color pallets and increasing sensitivity to residual intensity changes, as demonstrated in histopathology and other applications.
Implementation Method 1
The translucent material permits transmission of the illumination energy while diffusing the spatial details of the field of view, thus producing a featureless image of illumination intensities without discernible spatial features in the field of view.
Implementation Method 2
methods to remove the illumination from a focused image of a field of view are described by subtracting a defocused/diffused image of the same field of view pixel by pixel of the focused image
Data Source
AI summary
An array (map) of intrinsic images of an image of interest is established by selecting the intensities of a focused and defocused/diffused images of the image of interest. After obtaining a first focused image, a series of defocused/diffused images are obtained at different exposure times, where intrinsic images are obtained from the first focused image and the series of defocused/diffused images in order to form an array of image sets of the intrinsic images in the form of a matrix. In addition, a second focused image can be obtained at a different exposure time than the first focused image, and a second series defocused/diffused images are obtained at different exposure times, where second intrinsic images are obtained from the second focused image and the second series of defocused/diffused images in order to form an array of image sets of the intrinsic images and the second intrinsic images in the form of a matrix. The array of image sets cover and shows the required granularity of intrinsic differences among the intrinsic images generated enhancing the intrinsic images resulting in more noticeable details of the intrinsic image and the image of interest not previously appreciated.