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.

Calculation of the Color Matching Functions of Digital Cameras from Their Complete Spectral Sensitivities

Abstract: We propose a new algorithm to obtain the color matching functions of any digital camera, with correct weights and white bal- ance, from the relative scaling of their complete (3-D) spectral sensitivities obtained from real spectroradiometric data. Thanks to this algorithm, it is possible to predict the RGB digital levels of any digital camera in realistic illumination-scene environ- ments—spatially non-uniform illumination field, variable chromaticity and large dynamic range of luminance levels—opening the possibility of transforming any digital camera into a tele-colorimeter. The illumination-scene test was the Macbeth Color- Checker Chart under three different light sources (halogen, metal halide and daylight fluorescent lamps), provided by a non- standard light box. The results confirmed that it is possible to predict any RGB digital levels exclusively by varying the f-number of the camera zoom lens.

The reliability of digital cameras for color selection.

Abstract: PURPOSE This study evaluated the validity of the color selection results obtained from digital cameras. MATERIALS AND METHODS Four observers matched the colors of 30 extracted maxillary incisors under daylight conditions. Two different digital cameras, with 1.5- and 5.0-megapixel resolutions, were used to select the color of the standardized circular area with 3 reference points on the same teeth; a spectrophotometer was also used, and the results were compared with the human and camera observations. RESULTS The highest significant agreement (60% agreement with the spectrophotometric values) was found with the 5.0-megapixel camera. CONCLUSION It appears that the resolution capacity of a digital camera can increase the reliability of color selection.

Semantic image segmentation using visible and near-infrared channels

Abstract: Recent progress in computational photography has shown that we can acquire physical information beyond visible (RGB) image representations. In particular, we can acquire near-infrared (NIR) cues with only slight modification to any standard digital camera. In this paper, we study whether this extra channel can improve semantic image segmentation. Based on a state-of-the-art segmentation framework and a novel manually segmented image database that contains 4-channel images (RGB+NIR), we study how to best incorporate the specific characteristics of the NIR response. We show that it leads to improved performances for 7 classes out of 10 in the proposed dataset and discuss the results with respect to the physical properties of the NIR response.

Capturing the invisible: designing context-aware photography

Abstract: Taking a photograph using a digital camera is today still basically the same as using the analog counterpart. We are designing a digital camera that senses its context to explore new possibilities for digital photography. The sensor data produces real-time visual effects on the image displayed in the viewfinder and enables the user to take unique pictures, whose visual qualities reflect the context. Our first prototype is based on a digital camera mounted on a handheld computer. Our development process involves participatory design sessions with possible end users, including a panel of enthusiastic amateur photographers.

Viewer apparatus and its program

Abstract: PROBLEM TO BE SOLVED: To provide an apparatus by which even a user lacking a sense of directions can easily and surely grasp the position of a guide target such as a store located near a user's existing position. SOLUTION: Attribute information indicating the attributes of respective guide targets and coordinate information indicating the positions of these guide targets are stored in a database 18a in association with each other. In each supply of new image information from a digital camera 13, a position in an image pickup area of the digital camera 13 and its corresponding attribute information are read out from the database 18a and synthesized with a prescribed display position of an image which is indicated by the image information. COPYRIGHT: (C)2006,JPO&NCIPI