J-UNIWARD + Cost Polarization is an adaptive JPEG-domain approach that extends J-UNIWARD by using estimated side information. In HStego >= 0.4 this is implemented with Wiener filtering before applying cost polarization.
Quick Summary
- Domain:
- JPEG.
- Type:
- adaptive method with estimated side information.
- Tools:
- HStego >= 0.4 and a research implementation in StegoLab.
- Main reading:
- it is the least detectable JPEG entry in the current comparison, under the evaluated protocol.
Use in tools
In the current comparison, this method appears through HStego >= 0.4. This should be read as a method-level result implemented by those tool versions, not as a separate algorithm named “HStego”.
A separate J-UNIWARD + Cost Polarization research implementation is available in StegoLab. Unlike plain J-UNIWARD, this entry is represented in the current comparison through HStego >= 0.4 rather than through a generic Aletheia simulator.
Detectability results
In the evaluated setting, J-UNIWARD + Cost Polarization through HStego >= 0.4 is the least detectable JPEG method shown in the current comparison.
Results based on research implementations or simulators should be interpreted as method-level results. They can be slightly harder to detect than real end-user tools when they embed close to the theoretical limit and do not include all practical constraints of a complete tool.