demosaic

An efficient image demosaicing algorithm written in C.

A full report on this library can be found here.

Introduction

Image demosaicing (also known as image debayering, named after the Bayer filter) is a process used to interpolate data within an image that has had a mosaic filter applied. The most common application of this technique in engineering contexts is for demosaicing CMOS sensor images, which predominantly use the Bayer filter, shown in Figure 1. Today, nearly all commercially sold digital cameras employ CMOS sensors to capture images, and thus depend upon a demosaicing algorithm of some kind.

Figure 1: Image demosaicing process.

In many cases such as RAW-format digital photography, image information is saved as a mosaic, and demosaicing is performed during image rendering. However, there are common scenarios where demosaicing must be performed in real time. For example, one of the most common video compression techniques involves converting from the RGB color space into a different color space (for example, the YCC color space) that more efficiently conveys visual information. Because this process cannot work on image frames that have a mosaic filter applied, a demosaicing algorithm must interpolate missing information in the image in real time before the image frame can be compressed

Running the Program

Prerequisites

You should be on seng440.ece.uvic.ca.

Building the application

0. Clean any artifacts:

make clean

1. (Setup) encoding the images:

make encode

2. Compiling the demosaicing algorithm:

make arm

3. Running the algorithm:

make run

4. Generate the assembly:

make asm

The assembly is output to the /build directory.