Most digital cameras acquire data through a Bayer Colour Filter Array (CFA) placed on sensors where each pixel element records intensity information of only one colour component. The colour image is then produced through a pipeline of image processing algorithms which restores the subsampled components. In the last few years the wide diffusion of Digital Still Cameras (DSC) and mobile imaging d...

In this paper, we present a solution for the interpolation of low resolution digital images. Many digital cameras can function in two resolution modes: VGA (i.e., 640×480) and QVGA (i.e., 320×240). These cameras use a single sensor covered with a Color Filter Array (CFA). The CFA allows only one color component to be measured at each pixel, the remaining color components must be interpolated, t...

Modern digital still cameras sample the color spectrum using a color filter array coated to the CCD array such that each pixel samples only one color channel. The result is a mosaic of color samples which is used to reconstruct the full color image by taking the information of the pixels’ neighborhood. This process is called demosaicking. While standard literature evaluates the performance of t...

This paper presents a new noise model and its application to Bayer color filter array (CFA). We investigate the effect of various noise models. In addition, we study three possible Bayer patterns. For example, current Bayer CFA utilizes RGGB pattern. However, one may consider other color combinations such as RRGB or RGBB patterns. To prove RGGB pattern’s superiority, we investigate each pattern...

This thesis addresses the problem of Bayer-pattern video communications using Wyner-Ziv video coding (WZVC). It is studied how to take advantage of the low encoding complexity and the inherent error resiliency of WZVC for video compression and transmission. Moreover, it is investigated how to optimize the coding process specifically for Bayer-pattern video in order to improve the coding efficie...

A new Bayer pattern demosaicking scheme for single-sensor digital cameras is introduced. The raw output from a sensor, mostly a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) sensor, with a Bayer filter represents a mosaic of red, green and blue pixels of different intensity. To interpolate the two missing color components in each spatial location and constitute...

A Bayer pattern image codec method based on Wyner-Ziv structure is proposed in this paper. At the encoder the pixel of Bayer pattern image is converted into four component images by means of structural separation and transformation. Three of them are transformed into frequency domain by the discrete cosine transform. We extended the Lloyd iterative algorithm and designed an optimal scalar quant...

In this paper, the impact of demosaicing on gradient extraction is studied and a gradient-based feature pipeline based raw Bayer pattern images proposed. It shown both theoretically experimentally that are applicable to central difference algorithms with negligible performance degradation, as long arrangement color filter array (CFA) patterns matches operators. The constancy assumption, which w...