Pain sensation is essential for survival, since it draws attention to physical threat to the body. Pain assessment is usually done through self-reports. However, self-assessment of pain is not available in the case of noncommunicative patients, and therefore, observer reports should be relied upon. Observer reports of pain could be prone to errors due to subjective biases of observers. Moreover, continuous monitoring by humans is impractical. Therefore, automatic pain detection technology could be deployed to assist human caregivers and complement their service, thereby improving the quality of pain management, especially for noncommunicative patients. Facial expressions are a reliable indicator of pain, and are used in all observer-based pain assessment tools. Following the advancements in automatic facial expression analysis, computer vision researchers have tried to use this technology for developing approaches for automatically detecting pain from facial expressions. This paper surveys the literature published in this field over the past decade, categorizes it, and identifies future research directions. The survey covers the pain datasets used in the reviewed literature, the learning tasks targeted by the approaches, the features extracted from images and image sequences to represent pain-related information, and finally, the machine learning methods used.

To further extend the applicability of wearable sensors, methods for accurately extracting subtle psychological information from the sensor data are required. However, accessing subjective information in everyday life, such as cognitive load, remains challenging. To bring consensus on methods for cognitive load monitoring, a machine learning challenge is organized. The participants developed machine learning methods for cognitive load classification using wrist-worn physiological sensors' data, namely heart rate, R-R intervals, skin conductance, and skin temperature. The data from subjects solving cognitive tasks of varying difficulty is used for the challenge. This article presents a systematic comparison and multi-strategic performance evaluation of the thirteen methods submitted to this challenge. A systematic comparison of preprocessing techniques, classification algorithms, and implementation techniques is presented. Performance variations for different task difficulty levels, different subjects, and different experiment periods are evaluated. The results indicate that the most robust methods used multimodal sensor data, classical classification approaches such as decision trees and support vector machines or their ensembles, and Bayesian hyperparameter optimization for hyperparameter tuning. The most accurate models used handcrafted features that are further selected using sequential backward floating search and evaluated using stratified person-aware cross-validation strategy. Moreover, the results indicated better classification performance for specific test subjects, the tasks with the highest difficulty, and in some cases, the time elapsed since the start of the experiment. This dependency is likely due to model overfitting or due to the subjective nature of the psychophysiological process. The intersubject variability in responses is challenging to be captured through objective binary labels for cognitive load, thereby warranting more sophisticated annotation approaches.

The development of a two-stage approach for appraisal inference from automatically detected Action Unit (AUs) intensities in recordings of human faces is described. AU intensity estimation is based on a hybrid approach fusing information from individually fitted mesh model of the faces and texture information. Evaluation results for two datasets and a comparison against a state of the art system are provided. In the second stage, the emotional appraisals novelty, valence and control are predicted from estimated AU intensities by linear regressions. Prediction performance is evaluated based on face recordings from a market research study, which were rated by human observers in terms of perceived appraisals. Predictions of valence and control from automatically estimated AU intensities closely match those obtained from manually coded AUs in terms of agreement with human observers, while novelty predictions lag somewhat behind. Overall, results highlight the flexibility and interpretability of a two-stage approach to emotion inference.

Some industrial defects are geometric and invisible to a color camera, and anomaly detection on point clouds, depth maps and RGB-D images grew up around them. This survey covers 2020 to 21 August 2026, 94 detectors and 17 benchmark datasets, with an executable search protocol tested against the corpus and every collated number attributed to its source. Methods sit on two axes: six mutually exclusive scoring mechanisms (feature and memory matching, reconstruction, teacher–student discrepancy, density estimation, registration, and foundation-model transfer) and eight separable design dimensions, so fusion and zero-shot supervision are properties, not families. Benchmark results are collated with protocol, metric variant and peer-review status rather than ranked: on MVTec 3D-AD, the highest image-level area under the receiver operating characteristic curve (I-AUROC) is 98.4% peer-reviewed and 97.2% in a preprint, under differing protocols; the five highest span 1.1 points. Color-and-geometry fusion leads where both are captured; density estimation and reconstruction lead on point-cloud-only, few-shot Real3D-AD. Few of the 108 works examined report enough of the fields a runtime comparison needs. Sensing robustness is mostly tested along conditions an ablation already varies, rarely along those an instrument would introduce. A closing guide states what the evidence lets a practitioner select.

Indoor positioning based on 5G data has achieved high accuracy through the adoption of recent ma chine learning (ML) techniques. However, the performance of learning-based methods degrades significantly when environmental conditions change, thereby hindering their applicability to new scenarios. Acquiring new training data for each environmental change and fine-tuning ML models is both time-consuming and resource-intensive. This paper introduces a domain incremental learning (DIL) approach for dynamic 5G indoor localization, called 5G-DIL, enabling rapid adaptation to environmental changes. We present a novel similarity-aware sampling technique based on the Chebyshev distance, designed to efficiently select specific exemplars from the previous environment while training only on the modified regions of the new environment. This avoids the need to train on the entire region, significantly reducing the time and resources required for adaptation without compromisinglocalization accuracy. This approach requires as few as 50 exemplars from adaptation domains, significantly reducing training time while maintaining high positioning accuracy in previous environments. Compara tive evaluations against state-of-the-art DIL techniques on a challenging real-world indoor dataset demonstrate the effectiveness of the proposed sample selection method. Our approach is adaptable to real-world non-line-of-sight propagation scenarios and achieves an MAE positioning error of 0.261 meters, even under dynamic environmental conditions. Source code is available at: https://gitlab.cc-asp.fraunhofer.de/5g-pos/5g-dil.

Isolated facial movements, so-called Action Units, can describe combined emotions or physical states such as pain. As datasets are limited and mostly imbalanced, we present an approach incorporating a multi-label class balancing algorithm. This submission is subject to the Action Unit detection task of the Affective Behavior Analysis in-the-wild (ABAW) challenge at the IEEE Conference on Face and Gesture Recognition 2020.