Spectral Overlay Image Generation with Local Color Channel Reduction
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Solution Overview
Problem
Existing methods for generating overlay images of white light and spectral images, such as fluorescence images, often result in additional clipping and color shifts, leading to inaccurate intensity interpretation, particularly in medical applications where reliable diagnosis is crucial.
Innovation Solution
A method that selectively reduces complementary color channel values of the white light image based on the local intensity values of the spectral image to prevent color shifts and maintain image brightness, using a location-dependent approach rather than global weighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If global weighting is used to overlay white light image and spectral image, then the overlay image can be generated, but additional clipping and color shifts occur leading to inaccurate intensity interpretation
Solution Approach 1:
The patent applies local quality by transitioning from global weighting to location-dependent weighting. The weighting factor is calculated based on local intensity values of the spectral image at each pixel position, allowing different regions of the image to have different weighting factors. This ensures that areas with high spectral intensity maintain accurate color representation while avoiding additional clipping, thereby improving intensity interpretation accuracy without compromising overlay generation capability.
2Reliability
If complementary color channel values are not reduced, then the white light image maintains its original appearance, but color shifts occur in the overlay image affecting diagnostic accuracy
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the weighting factor based on local intensity values. The complementary color channel values are reduced by a factor that varies spatially according to the spectral image intensity. In regions where spectral signal is strong, the weighting factor reduces the white light contribution to prevent color shifts. In regions with weak spectral signal, the original white light image is preserved. This dynamic parameter adjustment maintains diagnostic accuracy while minimizing information loss.
3Manufacturing precision
If location-dependent weighting is used to prevent color shifts, then true-color representation is achieved, but the complexity of the overlay generation process increases
Solution Approach 1:
The patent applies segmentation by dividing the overlay generation process into distinct computational steps: calculating local intensity values from the spectral image, determining the weighting factor based on these intensity values, and applying the weighting factor to the white light image color channels. This segmented approach breaks down the complex location-dependent weighting process into manageable operations that can be efficiently implemented in image processing systems, reducing overall computational complexity while maintaining color representation accuracy.
Data Source
AI summary
To generate realistic overlay images (1) which are true-color with respect to at least one false color FF(x,y) used to visualize a spectral image (3a, 3b), a method and an associated image recording device (5) are provided, which enable undesired color shifts of such a false color to be avoided in the overlay image and a high image brightness of a white light image illustrated as an image background and the original image contrast of the white light image to be substantially maintained in the overlay image in spite of the overlay. Here, at least one color channel value of the white light image, which is complementary to the respective false color to be locally displayed, is locally deliberately reduced in each case, so the higher the resulting intensity I(x,y) of the spectral image (3a) also to be visualized in the overlay image is at this point (x,y).