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.

Motion image recording apparatus and digital camera

Abstract: A motion image recording apparatus includes a shutter button. When the shutter button is pressed, still image data in frames due to picture taking is subjected to compression by a JPEG CODEC. The compressed image data is written to an SDRAM that operates as a ring buffer. The compressed image data is read out of the SDRAM concurrently with such writing, and then recorded onto a memory card. As a result, long-time motion images are recorded on the memory card. However, the read rate from the SDRAM is slower than the write rate onto the SDRAM. Accordingly, the writing is suspended when a write position approaches a read position and they becomes a predetermined relationship.

Video game machine using digital camera and digital camera accessory for video game machine

Abstract: A digital camera accessory is provided for use with a game system having a processing system to execute a video game program and player controls operable by a user to generate video game control signals. The digital camera accessory includes an image sensor for capturing video images, communication circuitry configured to transmit the captured video images, and a connector that, in use, electrically connects the digital camera accessory to the game system.

Focussing of a Digital Camera

Abstract: A digital camera comprises an image sensor for capturing an image, a lens arrangement arranged to focus light onto the image sensor and providing a variable focus, and a memory for storing images captured by the image sensor. Focusing is achieved by a series of images having differing focus provided by the lens arrangement being captured by the image sensor and stored in the memory. Analysis of the images stored in the memory to determine the quality of the focus of the images is used to derive an in-focus image from the series of images. This avoids the complication of employing autofocusing control of the lens arrangement. Movement of the lens arrangement may be driven by movement of a button operable by a user which avoids the need for an actuator for the lens arrangement.

Digital camera security

Abstract: An image capture device, includes a body; an image sensor in the body; a lens configured to focus a scene onto the image sensor; a communications interface in the body; an image processor coupled to receive device information from an external device; a controller coupled to the communications interface and configured to control operations of the digital camera; and executable code embodied in a computer readable medium and configured to cause the controller to configure operational parameters of the digital camera based on information received from the external device. Examples of operational parameters that can be configured include locking and unlocking of the image capture device, encryption or other encoding of captured images, and device settings and configuration.

Digital camera calibration using images taken from an unmanned aerial vehicle

Abstract: For calibrating the camera, an accurate determination of the interior orientation parameters is needed. For more accurate results, the calibration images should be taken under conditions that are similar to the field samples. The aim of this work is the establishment of an efficient and accurate digital camera calibration method to be used in particular working conditions, as it can be found with our UAV (Unmanned Aerial Vehicle) photogrammetric projects. The UAV used in this work was md4-200 modelled by Microdrones. The microdrone is also equipped with a standard digital non- metric camera, the Pentax Optio A40 camera. To find out the interior orientation parameters of the digital camera, two calibration methods were done. A lab calibration based on a flat pattern and a field calibration were fulfilled. To carry out the calibration, Photomodeler Scanner software was used in both cases. The lab calibration process was completely automatic using a calibration grid. The focal length was fixed at widest angle and the network included a total of twelve images with± 90o roll angles. In order to develop the field calibration, a flight plan was programmed including a total of twelve images. In the same way as in the lab calibration, the focal length was fixed at widest angle. The field test used in the study was a flat surface located on the University of Almeria campus and a set of 67 target points were placed. The calibration field area was 25 × 25 m approximately and the altitude flight over ground was 50 m. After the software processing, the camera calibration parameter values were obtained. The paper presents the process, the results and the accuracy of these calibration methods. The field calibration method reduced the final total error obtained in the previous lab calibration. Furthermore the overall RMSs obtained from both methods are similar. Therefore we will apply the field calibration results to all our photogrammetric projects in which the flight high will be close to 50 m.