Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Contrastive Decoding(also: Visual Contrastive Decoding, VCD)
- Contrastive decoding is a technique for reducing hallucinations in large language model and multimodal AI outputs by comparing token probability distributions across different input conditions. The core principle is that tokens genuinely grounded in the input content will change…
- Visual Hallucination(also: AI hallucination, MLLM hallucination)
- In the context of multimodal AI systems, visual hallucination refers to the generation of descriptions or responses that contain information not grounded in the actual visual input—fabricating non-existent objects, misattributing properties such as colour or size, or…
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