A Comparison of Embedded Deep Learning Methods for Person Detection

Recent advancements in parallel computing, GPU technology and deep learning provide a new platform for complex image processing tasks such as person detection to flourish. Person detection is fundamental preliminary operation for several high level computer vision tasks. One industry that can significantly benefit from person detection is retail. In recent years, various studies attempt to find an optimal solution for person detection using neural networks and deep learning. This study conducts a comparison among the state of the art deep learning base object detector with the focus on person detection performance in indoor environments. Performance of various implementations of YOLO, SSD, RCNN, R-FCN and SqueezeDet have been assessed using our in-house proprietary dataset which consists of over 10 thousands indoor images captured form shopping malls, retails and stores. Experimental results indicate that, Tiny YOLO-416 and SSD (VGG-300) are the fastest and Faster-RCNN (Inception ResNet-v2) and R-FCN (ResNet-101) are the most accurate detectors investigated in this study. Further analysis shows that YOLO v3-416 delivers relatively accurate result in a reasonable amount of time, which makes it an ideal model for person detection in embedded platforms

Robotic Monitoring of Habitats: The Natural Intelligence Approach

In this paper, we first discuss the challenges related to habitat monitoring and review possible robotic solutions. Then, we propose a framework to perform terrestrial habitat monitoring exploiting the mobility of legged robotic systems. The idea is to provide the robot with the Natural Intelligence introduced as the combination of the environment in which it moves, the intelligence embedded in the design of its body, and the algorithms composing its mind. This approach aims to solve the challenges of deploying robots in real natural environments, such as irregular and rough terrains, long-lasting operations, and unexpected collisions, with the final objective of assisting humans in assessing the habitat conservation status. Finally, we present examples of robotic monitoring of habitats in four different environments: forests, grasslands, dunes, and screes

Two-year recall for people with no diabetic retinopathy : a multiethnic population-based retrospective cohort study using real-world data to quantify the effect

Background/aims: The English Diabetic Eye Screening Programme (DESP) offers people living with diabetes (PLD) annual screening. Less frequent screening has been advocated among PLD without diabetic retinopathy (DR), but evidence for each ethnic group is limited. We examined the potential effect of biennial versus annual screening on the detection of sight-threatening diabetic retinopathy (STDR) and proliferative diabetic retinopathy (PDR) among PLD without DR from a large urban multi-ethnic English DESP. Methods: PLD in North-East London DESP (January 2012 to December 2021) with no DR on two prior consecutive screening visits with up to 8 years of follow-up were examined. Annual STDR and PDR incidence rates, overall and by ethnicity, were quantified. Delays in identification of STDR and PDR events had 2-year screening intervals been used were determined. Findings: Among 82 782 PLD (37% white, 36% South Asian, and 16% black people), there were 1788 incident STDR cases over mean (SD) 4.3 (2.4) years (STDR rate 0.51, 95% CI 0.47 to 0.55 per 100-person-years). STDR incidence rates per 100-person-years by ethnicity were 0.55 (95% CI 0.48 to 0.62) for South Asian, 0.34 (95% CI 0.29 to 0.40) for white, and 0.77 (95% CI 0.65 to 0.90) for black people. Biennial screening would have delayed diagnosis by 1 year for 56.3% (1007/1788) with STDR and 43.6% (45/103) with PDR. Standardised cumulative rates of delayed STDR per 100 000 persons for each ethnic group were 1904 (95% CI 1683 to 2154) for black people, 1276 (95% CI 1153 to 1412) for South Asian people, and 844 (95% CI 745 to 955) for white people. Interpretation: Biennial screening would have delayed detection of some STDR and PDR by 1 year, especially among those of black ethnic origin, leading to healthcare inequalities

Control issues in high level vision.

Vision entails complex processes to sense, interpret and reason about the external world. The performance of such processes in a dynamic environment needs to be regulated by flexible and reliable control mechanisms. This thesis is concerned with aspects of control in high level vision. The study of control problems in vision defines a research area which only recently has received adequate attention. Classification criteria such as scope of application, knowledge representation, control structure and communication have been chosen to establish means of comparisons between the existing vision systems. Control problems have recently become of great topical interest as a result of the basic ideas of the active vision paradigm. The proponents of active vision suggest that robust solutions to vision problems arise when sensing and analysis are controlled (i.e. purposively adjusted) to exploit both data and available knowledge (temporal context). The work reported in this thesis follows the basic tenets of active vision. It is directed at the study of control of sensor gaze, scene interpretation and visual strategy monitoring. Control of the visual sensor is an important aspect of active vision. A vision system must be able to establish its orientation with respect to the partially known environment and have control strategies for selecting targets to be viewed. In this thesis algorithms are implemented for establishing vision system pose relative to prestored environment landmarks and for directing gaze to points defined by objects in an established scene model. Particular emphasis has been placed on accounting for and propagating estimation errors arising from both measured image data and inaccuracy of stored scene knowledge. In order to minimise the effect of such errors a hierarchical scene model has been adopted with contextually related objects grouped together. Object positions are described relative to local determined landmarks and this keeps the size of errors within tolerable bounds. The scene interpretation module takes image descriptions in terms of low level features and produces a symbolic description of the scene in terms of known objects classes and their attributes. The construction of the scene model is an incremental process which is achieved by means of several knowledge sources independently controlled by separate modules. The scene interpreter has been carefully structured and operates in a loop of perception that is controlled by high level commands delivered from the system supervisor module. The individual scene interpreter modules operate as locally controlled modules and are instructed as to what visual task to perform, where to look in the scene and what subset of data to use. The module processing takes into account the existing partial scene interpretation. These mechanisms embody the concepts of spatial focus of attention and exploitation of temporal context. Robust scene interpretation is achieved via temporal integration of the interpretation. The element of control concerned with visual strategy monitoring is at the system supervisor level. The supervisor takes a user given task and decides the best strategy to follow in order to satisfy it. This may involve interrogation of existing knowledge or the initiation of new data collection and analysis. In the case of new analysis the supervisor has to express the task in terms of a set of achievable visual tasks and then these are encoded into a control word which is passed to the scene interpreter. The vocabulary of the scene supervisor includes tasks such as general scene exploration, the finding of a specific object, the monitoring of a specified object, the description of attributes of single objects or relationships between two or more objects. The supervisor has to schedule sub-tasks in such a way as to achieve a good solution to the given problem. A considerable number of experiments, which make use of real and synthetic data, demonstrate the advantages of the proposed approach by means of the current implementation (written in C and in the rule based system Clips)