3D Volume Rendering Depth Cueing via Color Channel Permutation
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Solution Overview
Problem
Current methods for representing three-dimensional medical image data sets in two-dimensional images, such as depth cueing, often result in a loss of information and unclear images, making it difficult to recognize global relations and positioning in anatomic structures.
Innovation Solution
A method that uses volume rendering with a second color value assigned to each voxel based on a depth color chart generated by permuting color channels, combined with a weighting function to interpolate between original and depth color charts, ensuring colors fade to a calculated color rather than a predetermined color, enhancing depth perception without blurring or losing information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If depth cueing is applied to improve sense of depth, then depth perception is enhanced, but image clarity and information are lost
Solution Approach 1:
The patent applies depth cueing by changing color characteristics (saturation, hue, or brightness) as a function of depth position. Voxels at different depths are assigned different color properties, with foreground voxels having higher saturation and background voxels having lower saturation or different hues. This creates a sense of depth while preserving image information through color differentiation rather than blurring or fading to monochrome.
Solution Approach 2:
The patent modifies color parameters (saturation, hue, brightness) based on depth position. A weighting function is applied to interpolate between original colors and depth-cued colors, allowing continuous transition of color properties with depth. This parameter-based approach enhances depth perception while maintaining information integrity through controlled color transformation.
2Illumination intensity
If fogging is applied to enhance depth perception, then sense of depth is improved, but image clarity deteriorates
Solution Approach 1:
Instead of applying fogging that fades colors to white or black, the patent uses color changes that differentiate depths through saturation and hue variations. This approach maintains image clarity and information visibility while providing strong depth cues through color differentiation across depth planes.
3Illumination intensity
If color saturation is changed with depth to improve depth perception, then sense of depth is enhanced, but color accuracy is compromised
Solution Approach 1:
The patent systematically changes color parameters (saturation, hue, or brightness) as a function of depth position using a weighting function. This controlled parameter modification enhances depth perception while maintaining a systematic relationship between original and transformed colors, allowing interpretation of both depth and original color information.
Solution Approach 2:
The depth-cued color representation provides visual feedback about depth position through systematic color variations. The weighting function creates a continuous transition that gives observers feedback about relative depth positions while preserving the ability to interpret original color information through the color transformation pattern.
Data Source
AI summary
The invention relates to method and an apparatus for depth cueing, i.e. improving the sense of depth in two-dimensional images of three-dimensional volume data, said 2D images being generated using volume rendering. The invention is characterized in that a second depth color chart generated from the original color chart by permuting at least two color channels is used in the depth dimension. Alternatively, all three color channels can be permuted.