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.

Combining gray world and retinex theory for automatic white balance in digital photography

Abstract: White balancing is an important step in the digital camera processing pipeline to adjust the color of the pixels under different illuminations. Efficient automatic white balance is usually a required component of a consumer digital camera because many users would not prefer to handle this task manually. Gray world assumption and retinex theory are two common methods used, but their aims vary and their applicability depends on the nature of the images. In this paper, we present an effective technique that combines the two together, while preserving the strength of the two methods. Experimental results confirm that our approach is a viable alternative to the two existing methods.

Self-calibrating, digital, large format camera with single or multiple detector arrays and single or multiple optical systems

Abstract: Large format, digital camera systems (10, 100, 150, 250, 310) expose single detector arrays 20 with multiple lens systems (12, 14, 16, 18) or multiple detector arrays (104, 106, 108, 110, 112, 114, 116, 118, 120, 152, 162, 172, 182, 252, 262, 272, 282, 322, 324) with one or more single lens systems (156, 166, 176, 186) to acquire sub-images of overlapping sub-areas of large area objects. The sub-images are stitched together to form a large format, digital, macro-image (80, 230', 236', 238', 240'), which can be colored. Dampened camera carrier (400) and accelerometer (404) signals with double-rate digital signal processing (306, 308) are used.

Digital imaging device optimized for color performance

Abstract: A digital imaging device captures an image and generates a color signal from the image for application to an output device having specific color sensitivities, the imaging device further being one of many devices of the same type useful with the output device. The digital imaging device, for example a digital camera, includes a color sensor for capturing the image and generating a color signal from the captured image, the color sensor having predetermined spectral sensitivities, and an optical section that is interposed in the image light directed to the color sensor, the optical section also having predetermined spectral characteristics. The combination of the spectral sensitivities of the color sensor and the spectral characteristics of the optical section uniquely distinguish this particular imaging device from other imaging devices of the same type. By providing a set of matrix coefficients uniquely determined for this imaging device, the matrix coefficients optimally correct the spectral sensitivities of the color sensor and the spectral characteristics of the optical section for the color sensitivities of the output device.

Digital close range photogrammetry for measurement of soil erosion

Abstract: Many of the processes involved in soil erosion have dimensions on the millimetre scale. Modelling and quantification of such processes require information on soil surface topography with adequate resolution. The purpose of this study was to generate digital elevation models (DEMs) from soil surfaces with high spatial and temporal resolution. Digital photogrammetry was applied for measuring erosion rates on complex-shaped soil surfaces under laboratory rainfall conditions. A total of 60 DEMs were generated, covering a planimetric area of 16 m 2 . The DEMs had a grid resolution of 3 mm. A vertical precision of approximately 1 mm was desired for DEM analysis. A consumer-grade digital camera was used for image acquisition. The camera was calibrated using BLUH software. Homologous points in overlapping images were identified with least squares matching software. Irregularly spaced object coordinates were interpolated to a regular grid in a geographic information system. The resulting DEMs represented the soil surface well. A precision of 1AE26 mm in the vertical was attained. The precision of DEM production was limited to camera calibration. Improvements of the setup presented could include the use of better control points and more advanced image matching strategies for identification of homologous points. The DEMs allowed for detailed analysis of soil surface evolution.

Digital camera system

Abstract: A digital camera system capable of operating by detecting a feature point, which has not been accomplished, in addition to ordinary functions of a conventional camera is provided. According to an aspect of the present invention, a digital camera system includes a detecting means that detects a given feature point from an image data, a receiving means that receives an order from a user, a selecting means that selects each feature point in accordance with a given order instructed by the receiving means when a plurality of feature points are detected, and a display that displays feature point information identifying the feature point selected by the selecting means.