Topic
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.
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Patent•
22 May 1997
TL;DR: In this article, a method is developed to detect the presence of specular reflections in a scene, to modify the exposure time of the photo-sensitive means, which converts a luminous image to electronic image signals and to apply a gradation correction to the image data thus acquired.
Abstract: Image processing parameters for gradation correction of a digital image from a scene, which includes specular reflections may be seriously influenced by the presence of those specular reflections. Therefore, a method is developed to detect the presence of specular reflections in a scene, to modify the exposure time of the photo-sensitive means, which converts a luminous image to electronic image signals and to apply a gradation correction to the image data thus acquired. In one embodiment a digital camera is used to capture the image data, a cumulative histogram is built and two characteristic cumulative frequencies are used to determine via the histogram specular densities and highlight densities. The relative position of these density values indicates whether specular reflections are present, and give suitable parameters for setting an optimal exposure time and for computing a gradation correction curve.
88 citations
Patent•
10 Apr 2007TL;DR: In this paper, a digital camera delays the capture of a digital image after image capture has been requested until the motion of the digital camera satisfies a motion criterion, thereby reducing image blur that would otherwise occur due to camera motion.
Abstract: A digital camera delays the capture of a digital image after image capture has been requested until the motion of the digital camera satisfies a motion criterion. The digital camera thereby reduces image blur that would otherwise occur due to camera motion.
88 citations
Patent•
13 Jun 2002
TL;DR: In this article, an improved method of taking pictures to capture a precise picture composition is provided, which is implemented in a digital camera as an operation mode or feature, and when this mode is activated, the camera captures a series of images including a precisely picture composition desired by the user.
Abstract: An improved method of taking pictures to capture a precise picture composition is provided. The invention is implemented in a digital camera as an operation mode or feature. When this mode is activated, the camera captures a series of images including a precise picture composition desired by the user. From the series of images describing a chronological sequence of events, the user can select a best-timed shot.
88 citations
TL;DR: This novel approach to build 3-D models of skin wounds from color images using a low-cost and user-friendly image acquisition device suitable for widespread application in health care centers entails the development of a robust image processing chain.
Abstract: In this paper, after an overview of the literature concerning the imaging technologies applied to skin wounds assessment, we present an original approach to build 3-D models of skin wounds from color images. The method can deal with uncalibrated images acquired with a handheld digital camera with free zooming. Compared with the cumbersome imaging systems already proposed, this novel solution uses a low-cost and user-friendly image acquisition device suitable for widespread application in health care centers. However, this method entails the development of a robust image processing chain. An original iterative matching scheme is used to generate a dense estimation of the surface geometry from two widely separated views. The best configuration for taking photographs lies between 15deg and 30deg for the vergency angle. The metric reconstruction of the skin wound is fully automated through self-calibration. From the 3-D model of the skin wound, accurate volumetric measurements are achieved. The accuracy of the inferred 3-D surface is validated by registration to a ground truth and repetitive tests on volume. The global precision around 3% is in accordance with the clinical requirement of 5% for assessing the healing process.
88 citations