The proposed paper concerns the processing of images in digital format and, more specifically, particular techniques that can be advantageously used in digital still cameras for improving the quality of images acquired with a non-optimal exposure. The proposed approach analyses the CCD/CMOS sensor Bayer data or the corresponding color generated image and, after identifying specific features, it...

Using the most recent (April 2003) version of the VLA FIRST survey radio catalog, we have searched for radio emission from > 2800 AGN taken from the most recent (2001) version of the Veron-Cetty and Veron AGN catalog. These AGN lie in the ∼9033 square degrees of sky already covered by the VLA FIRST survey. Our work has resulted in positive detection of radio emission from 775 AGN of which 214 a...

Log-polar images have been being used for pattern recognition and active vision tasks for some years. These images are obtained either from true retina-like sensors or from conventional cartesian images by software conversion. From the hardware perspective, the design of such log-polar retinae faces its own technological limitations. In the case of software remappers, however, their very flexib...

This article presents an optimized sensor planning system for active visual inspection Ž . of three-dimensional manufacturing computer-aided design CAD models. Quantization errors and displacement errors are inevitable in active visual inspection. To obtain high accuracy for dimensioning the entities of three-dimensional CAD models, minimization of these errors is essential. Spatial quantizatio...

This paper considers the modes of interaction between one or several human operators and an active sensor network – a fully decentralized network of sensors some or all of which have actuators and are in that sense active. The primary goal of this study is to investigate the conditions under which the human involvement will not jeopardize scalability of the overall system. Two aspects of human-...

In this paper, an omnidirectionnal range sensor is reported. This active vision sensor combines a CCD camera and a laser diode. We use two methods to obtain the depth of the scene: a calibration method and a least square method. We describe the prototype we made. Experimental results are presented. A comparative test shows that this sensor seems to be as accurate as a laser telemeter but less s...

While sensor networks are going to be deployed in diverse application specific contexts, one unifying view is to treat them essentially as distributed databases. The simplest mechanism to obtain information from this kind of a database is to flood queries for named data within the network and obtain the relevant responses from sources. However, if the queries are (a) complex, (b) one-shot, and ...

N. E. Pears Department of Engineering Cambridge University Cambridge, CB2 1PZ, UK email: [email protected] Abstract An active range sensor is summarised. This sensor can direct its eld of view in order to xate on range features for mobile robot navigation. The image position sensor used has a Gaussian noise characteristic with measurable variance, which makes the sensor particularly amenable to...

This brief provides a detailed analysis of active pixel sensor, pixel and column circuit. Surprisingly, we find that shorter readout times can be achieved by reducing the bias current and hence reducing energy consumption. We investigate the effect of nonidealities on the readout operation. We find that when the follower transistor channel-length modulation is taken into consideration, delay is...

This 256x256 active pixel sensor (APS) is designed for consumer multimedia applications requiring low-cost, high-functionality, compact cameras capable of acquiring highquality images at video frame rates. This sensor allows random access of the image data, permitting a simple implementation of electronic pan and zoom. Use in portable equipment is simplified by standard operatingvoltages andlow...