Volume Rendering with Uncertainty Information

Abstract:

This paper explores two general methods for incorporating volumetric uncertainty information in direct volume rendering. The goal is to produce volume rendered images that depict regions of high (or low) uncertainty in the data. The first method involves incorporating the uncertainty information directly into the volume rendering equation. The second method involves post-processing information of volume rendered images to composite uncertainty information. We present some initial findings on what mappings provide qualitatively satisfactory results and what mappings do not. Results are considered satisfactory if the user can identify regions of high or low uncertainty in the rendered image. We also discuss the advantages and disadvantages of both approaches.

Papers:

• Volume Rendering with Uncertainty Information in VisSym 2001.
• Visualizing Scalar Volumetric Data with Uncertainty in Computers and Graphics, vol 26, 2002, pp. 239-248.

Images:

Inline Method

1D Transfer Function

Uncertainty Thresholding

mean salinity	uncertainty > 0.2	uncertainty > 0.5

transfer function (lower contrast)	mean salinity	mean temperature

transfer function (higher contrast)	mean salinity	mean temperature

2D Transfer Function

histogram of mean salinity data

2D transfer function for salinity	constant opacity	increasing opacity

2D transfer function for salninity	constant opacity	increasing opacity

Post-Processing method:

Standard Deviation Volren

Inverted bitmap of the same




Combined with original image

Larger speckles




Applying texture

...or color speckles

Texture ideas

Cracked Soil

Rubber

Texture contrasts

Low Contrast

High Contrast

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