We describe a framework that explicitly reasons about data association and combines estimates to improve tracking performance in many difficult visual environments. This work extends two previously reported algorithms: the PDAF, which handles single-target tracking tasks involving agile motions and clutter, and the JPDAF, which shares information between multiple same-modality trackers (such as...

In this paper, we propose a new method for real time obstacle avoidance using visual information. It is based on our on-going research on vector fields and potential functions associated to successful motion planning algorithms. Specifically, this paper addresses the avoidance of dynamic obstacles, which have the property of producing instabilities in the navigation vector field associated to a...

Despite demonstrations of perceptual impairments in schizophrenia as far back as Kraepelin ( 1903 ), and although the visual system is the most understood area of cognitive neuroscience, there has been much less work focused on vision in schizophrenia compared to other domains (e.g., memory, executive function) (Silverstein & Keane, 2011b ). This, despite an ever increasing body of literature i...

Three patients had during pregnancy visual disturbances caused by central serous choroidopathy. One of them had a central scotoma in her first and second pregnancy. The 2 other patients had a central scotoma in their first pregnancy. Symptoms disappeared spontaneously after delivery. Except for the ocular abnormalities the pregnancies were without complications. The complaints can be misinterpr...

We objectively measured optical quality and quantified such nightvision disturbances as glare, starbursts, and halos perceived by patients diagnosed with cataracts. For this purpose, retinal-image quality was measured with a double-pass device (OQAS, Visiometrics SL). Visual-discrimination capacity was quantified by the disturbance index under low illumination (Halo v1.0 software, Laboratory of...

A 51 year old man presented with a two year history of gradually deteriorating vision in his left eye, accompanied by 34 kg weight gain, easy bruising, and hypertension which was relatively resistant to conventional treatment. The patient denied any history of headaches. On examination, his general appearance was as shown (fig 1). On ocular examination his visual acuity was 6/6 in the right and...

Visual disturbances in dengue infection are uncommon but may result in permanent visual impairment. We report a 32-year-old Chinese woman with dengue infection and she developed retinal haemorrhage, retinal vasculitis and macular detachment. Autoimmune screen revealed a low C4 complement level, possibly due to partial C4 complement deficiency. The patient was treated with steroids and there was...