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.

Method of notification of inadequate picture quality

Abstract: In a digital camera including a digital signal processing portion processing a digital image and a display device displaying the image according to a digital signal from the digital signal processing portion, and a control portion controlling overall operation, after the user takes a picture, image data is analyzed by the digital signal processing portion to determine picture quality and, when it is determined that the picture quality is inadequate, the user is informed of information regarding the quality of the picture.

Low-Light Auto-Focus Enhancement for Digital and Cell-Phone Camera Image Pipelines

Abstract: Images captured by a digital or cell-phone camera in low-light environments usually suffer from a lack of sharpness due to the failure of the camera's passive auto-focus (AF) system to locate the peak in-focus position of a sharpness function that is extracted from the image. In low-light, the sharpness function becomes flat, making it quite difficult to locate the peak.In this paper, a systematic approach is introduced to address the problem of low-light AF by performing computationally simple image enhancement preprocessing steps as part of the image pipeline. These enhancement steps elevate the sharpness function peak, leading to auto-focusing in low-light conditions. A sharpness junction quality measure along with experimental guidelines are presented for determining the most prominent enhancement steps for low-light AF. The implementation results on an actual digital camera platform are also shown to demonstrate the effectiveness of our solution.

Improving Color Reproduction Accuracy on Cameras

Abstract: One of the key operations performed on a digital camera is to map the sensor-specific color space to a standard perceptual color space. This procedure involves the application of a white-balance correction followed by a color space transform. The current approach for this colorimetric mapping is based on an interpolation of pre-calibrated color space transforms computed for two fixed illuminations (i.e., two white-balance settings). Images captured under different illuminations are subject to less color accuracy due to the use of this interpolation process. In this paper, we discuss the limitations of the current colorimetric mapping approach and propose two methods that are able to improve color accuracy. We evaluate our approach on seven different cameras and show improvements of up to 30% (DSLR cameras) and 59% (mobile phone cameras) in terms of color reproduction error.

Image processor capable of block-noise-free JPEG2000 compression with 30 frames/s for digital camera applications

Abstract: A one-chip image processor for next-generation digital cameras and broadband PDA multimedia mobile phones is described. It is capable of processing JPEG2000 data with 30 frames/s and a 27 MHz operating frequency. The process is fabricated in 0.25 /spl mu/m CMOS and contains 8.5M transistors in a 103 mm/sup 2/ area.

Camera module with ambient light detection

Abstract: A camera module forms digital images and measures an ambient light level. A device such as a digital camera, a telephone, or a PDA containing the camera module can set lighting levels of I/O systems such as keypads or displays according to the ambient light level to thereby save power or optimize functionality of the I/O systems. A dedicated sensor in the camera module or one or more selected sensors in the imaging array of the camera module can measure the ambient light level.