Calibration
Definition
A steganalysis technique that estimates the cover image statistics by cropping or decompressing and re-compressing the test image to produce a reference. Differences between the test image statistics and the calibrated reference reveal embedding distortion. Widely used against JPEG steganography.
Related terms
- Accreditation
- Formal recognition by a standards body (such as UKAS in the UK, A2LA in the US, or NABL in India) that a...
- Adaptive Embedding
- A steganographic strategy that concentrates embedding changes in high-texture or high-noise image regions where they are perceptually and statistically harder to detect....
- Chi-Square Attack
- A specific steganalysis test for LSB substitution in images. It tests whether pairs of pixel values that are related by flipping the...
- Convolutional Steganalysis Network
- A deep neural network trained end-to-end to classify cover versus stego images. Architectures such as XuNet, SRNet, and Yedroudj-Net use learned high-pass...
- ISO 9001
- The international standard for quality management systems published by the International Organization for Standardization. Certification means the organisation has documented and implemented...
- ISO/IEC 17025:2017
- The international standard specifying general requirements for the competence of testing and calibration laboratories. Covers management (document control, non-conforming work, audits) and...
- LSB Substitution
- Least-significant-bit substitution: the lowest-order bit of each sample value (pixel colour channel or audio sample) is overwritten with one bit of the...
- NABL
- National Accreditation Board for Testing and Calibration Laboratories, a constituent board of the Quality Council of India. It is the sole accrediting...
- Proficiency Testing (PT)
- A quality assurance mechanism in which laboratories analyse blind samples distributed by an external scheme coordinator and have their results compared against...
- Quality Assurance (QA)
- The management system that ensures QC actually happens and stays effective over time: written SOPs, training and competence records, internal audits, document...
- Quality Control (QC)
- The day-to-day activities that verify a single batch of results is reliable: method blanks, certified-reference-material runs, duplicate injections, spike recoveries and control-chart...
- Rich Model (SRM)
- A high-dimensional feature set for steganalysis constructed from joint statistics of pixel prediction residuals computed with many different filter kernels and quantisation...
Explained in these topics
- Quality Control Management in Forensic InstitutionsOperation that establishes the relation between a measuring instrument's indication and the corresponding value of a measurement standard, with stated uncertai...
- Steganalysis: Statistical and Machine Learning Detection MethodsA steganalysis technique that estimates the cover image statistics by cropping or decompressing and re-compressing the test image to produce a reference. Diffe...