Spatial Frequency Response of Bayer Color Image Formation

IRWIN AND JOAN JACOBS CENTER FOR COMMUNICATION AND INFORMATION TECHNOLOGIES Spatial Frequency Response of Bayer Color Image Formation

Moiré Reduction Using Inflection Point and Color Variation in Digital Camera of No Optical Low Pass Filter

The role of an optical low-pass filter (OLPF) in a digital still camera is to remove the high spatial frequencies that cause aliasing, thereby enhancing the image quality. However, this also causes some loss of detail. Yet, when an image is captured without the OLPF, moiré generally appears in the high spatial frequency region of the image. Accordingly, this paper presents a moiré reduction met...

2PFCTM (two pixels, full color): Image sensor demosaicing and characterization

We propose a modification to the standard Bayer CFA and photodiode structure for CMOS image sensors, which we call 2PFCTM (Two Pixels, Full Color). The blue and red filters of the Bayer pattern are replaced by a magenta filter. Under each magenta filter are two stacked, pinned photodiodes; the diode nearest the surface absorbs mostly blue light and the deeper diode absorbs mostly red light. The...

Color Demosaicing Using Asymmetric Directional Interpolation and Hue Vector Smoothing

This paper presents a color demosaicing method applied to the Bayer pattern color filter array (CFA). Reliable estimation of an edge direction, edge-directed asymmetric interpolation, and the use of color samples at immediate neighbors are considered as the key guidelines for smooth and sharp image restoration. Also, special interest is directed to local areas that are rich in high spatial freq...

Spatial Gaussian Filtering of Bayer Images with Applications to Color Segmentation

A single sensor color imaging device has a color filter array (CFA) laid on top of its photodiodes, which spatially samples bandpassed spectral responses. Hence, with the popular Bayer pattern, at every pixel site either red, green or blue light is measured. A process known as demosaicing interpolates the vector-valued color image from the scalar-valued sensor output, termed here as the Bayer i...