Bruce Harold Pillman

Camera exposure determination based on a psychometric quality model

This paper discusses exposure determination for digital cameras, beginning with a tutorial on exposure control and the factors affecting the quality of still captures, especially exposure index. It presents a psychometric model for the overall quality of digital camera images as a function of motion blur and exposure index. A motion-aware exposure control algorithm based on that model is described for exclusively ambient illumination and then extended for combined flash and ambient illumination. Results from a field test with a modified consumer camera quantify the effectiveness of the algorithm.

Digital Camera Image Formation: Processing and Storage

This chapter presents a high-level overview of image formation in a digital camera, highlighting aspects of potential interest in forensic applications. The discussion here focuses on image processing, especially processing steps related to concealing artifacts caused by camera hardware or that tend to create artifacts themselves. Image storage format issues are also discussed.

Flexible readout image capture with a four-channel CFA

This paper discusses use of a single image sensor with a four-channel color filter array (CFA) and flexible readout capabilities for a compact digital camera. It considers camera system technology and design tradeoffs, followed by a discussion of an example four-channel sensor. Advantages of the sensor include better sensitivity than a similar sensor with a three-channel CFA and more flexible exposure and readout control. The example sensor enables a new approach for multiframe image capture, termed multicomponent image capture.

Digital Camera Image Formation: Introduction and Hardware

A high-level overview of image formation in a digital camera is presented. The discussion includes optical and electronic hardware issues, highlighting the impact of hardware characteristics on the resulting images.