Tone Mapping of High Dynamic Range Images for Terashake 2.1 Data
This article shows the result of applying different tone mapping operators on HDR images generated by direct volume rendering. We evaluated a total of 24 tone mapping functions.
We input HDR images (given in OpenEXR format) to the tone mapping functions, which generate LDR images in jpeg formats. The input images are generated using Vista, which does direct volumne rendering on data given by Terashake 2.1 earthquake simulation. Below are some images generated by different tone mapping functions. The original image that uses a LDR transfer function can be found here (PNG / OpenEXR).
More information about the individual tone mapping operators can be found in this document.
Test results on synthetic data set can be found here.
|
|
|
|
| Operator |
|
|
|
|
Ashikhmin's operator
|
|
|
|
| Bilateral filtering |
|
|
|
| Chiu's spatially variant operator |
|
|
|
| Drago's logarithmic mapping |
|
|
|
| Ferschin's exponential mapping |
|
|
|
| Ferwerda's scale factor |
|
|
|
| Gradient domain compression |
|
|
|
| Histogram adjustment |
|
|
|
| Horn's lightness computation |
|
|
|
| iCAM |
|
|
|
| Linear scaling (included for comparison) |
|
|
|
| Logarithmic mapping |
|
|
|
| Miller's operator |
|
|
|
| Pattanaik's multi-scale observer model |
|
|
|
|
Oppenheim's frequency domain operator
|
|
|
|
| Pattanaik's visual adaptation for time-dependent display |
|
|
|
| Photographic operator |
|
|
|
| Photoreceptor-based operator |
|
|
|
| Retinex |
|
|
|
| Schlick's uniform rational quantization |
|
|
|
| Tumblin-Rushmeier operator |
|
|
|
| Trilateral filtering |
|
|
|
| Ward's contrast-based scale factor |
|
|
|
| Yee's segmentation-based technique |
|
|
|
Vista command line options for generating the HDR images:
./vista -r 0.266 0.5 1.0 -g 0.5 0.5 0.5 0.0 -n 1 -a 0.0001 --tmapfile ./colormaps/sub-vol93_hdr2.cmp --raw 133 500 1000 --minmax -0.50 .50 -x 1280 -y 1024 --outmode verbose --outformat hdr -b 226 -e 226 -s 1 --camfile ./myCam.cam --outbase ./vol_8th_5000b.hdr ./voly_8th_5000 --swapbytes
Example of tone mapping command line options:
tm_photographic -i "infile" -o "outfile"
Note: Yee's segmentation-based technique requires "-global" option enabled.
