Digital camera

About: Digital camera is a research topic. Over the lifetime, 12169 publications have been published within this topic receiving 137431 citations. The topic is also known as: digicam & digital still camera.

The accuracy of a river bed moulding/casting system and the effectiveness of a low-cost digital camera for recording river bed fabric

Abstract: Digital photogrammetry has been used to develop and test an artificial river bed moulding and casting system, which allows the pebbles within a coarse-grain river bed to be recreated for hydraulic research in a laboratory flow channel or flume. Imagery of both the original streambed and the cast facsimile was acquired using a non-metric Kodak DCS460 digital camera and digital elevation models and orthophotographs were derived and compared to assess the accuracy of the moulding and casting system. These comparative tests proved to be critical in modifying and developing the system. Additional imagery was obtained in the field using a non-metric Olympus C3030 ‘‘compact’’ digital camera to assess whether far cheaper camera technology could deliver data appropriate for such comparative examinations. Internal calibration parameter sets and data that were generated were compared with data obtained by the non-metric Kodak DCS460. These tests demonstrate that digital sensors built around highquality 35 mm professional camera bodies and lenses are required for comparative examinations and for similar system development.

360 Degree surveillance system and method

Abstract: A 360 degree surveillance system includes a 360-degree digital camera, a power source, a camera control system, a portable digital storage medium, a wireless communications system, and an archive digital storage medium. The digital camera has a fixed lens unit with a simultaneous 360-degree panoramic view, or a movable lens unit that is remotely controllable for pan, tilt and zoom. A remote control system is wirelessly linked to the wireless communications system. The wireless communications system sends the images to a computer network for viewing with a standard web browser, PDA, or dedicated monitoring system. The 360 degree surveillance system monitors an area with a camera; directs the camera with a control system; collects a plurality of images; stores the images on the portable storage medium; uploads the images to an archive storage medium; and creates a plurality of archived images on the archive storage medium.

Method and system for processing DOS information within a digital still camera

Abstract: A digital camera which captures images and converts the images to a digital form. The digital form of the images is compressed and written into a memory card along with Disk Operating System (DOS) information describing the memory card and files including bios parameters, File Allocation Table (FAT) information, and directory information. When the DOS information within the memory card needs to be changed, the FAT information of the memory card and only a portion of the directory information is read and transferred to a memory within the camera. The directory information which has been loaded into the camera is checked to determine if it is the necessary directory information. If it is not, further directory information is loaded into the memory of the camera. After editing of the FAT and directory information, the edited information is written back into the memory card.

Image processing apparatus for performing shading correction on synthesized images

Abstract: A digital camera which is an image processing apparatus is controlled so that a first image and a second image are acquired for the same subject in different timings. A plurality of correction tables for use in shading correction are prepared in advance in a shading ROM of the digital camera. When a first image and a second image are acquired, multiplication of one correction table is performed on both images by a shading correction circuit. As a result of this, a shading correction is effected on both images. The first image and the second image that have been subjected to the shading correction are taken into respective image memories, and after being subjected to a positioning process by a general controller, they are synthesized to generate a synthesized image.

Fundaments in Luminance and Retroreflectivity Measurements of Vertical Traffic Signs Using a Color Digital Camera

Abstract: This paper is a study of the influences of the different parameters which affect the photometric evaluation of light-emitting surfaces (due to reflection or self-emission) when a conventional color digital camera is used. The overall purpose of this paper is to evaluate the luminance and the reflectivity of the vertical traffic sign with the camera in order to provide an automatic recognition of deteriorated reflective sheeting material of which the traffic signs were made. This paper describes how the A/D converter output signal given by a pixel of the digital camera can be related to the luminance and the reflectivity of the corresponding surface element whose image is formed on a pixel. Thus, each surface element of the traffic sign's surface can be separately evaluated. By photometrically calibrating the camera, we have been able to prove this relationship in our experiments.