High dynamic range CMOS (HDRC) imagers for safety systems

The initial section of this document outlines the high dynamic range CMOS (HDRC) imager, a specialized type of CMOS image sensor characterized by its logarithmic response. The significant capabilities of high dynamic range (HDR) image acquisition are explained through mathematical definitions and the measurement of the optoelectronic conversion function (OECF) for two distinct HDRC imagers. Furthermore, specific sensor parameters will be examined, including the pixel design for global shutter readout. The latter portion of the document will present an overview of the applications and requirements for cameras used in industrial safety. The SafetyEYE system, which utilizes HDRC global shutter sensors, is a high-performance stereo camera system designed for safe three-dimensional zone monitoring, offering innovative and more adaptable solutions compared to conventional safety guards.

The high dynamic range CMOS (HDRC) imager represents a significant advancement in imaging technology, particularly for applications requiring the capture of scenes with extreme contrasts in illumination. The logarithmic response of the HDRC sensor allows it to effectively manage a wide range of light intensities, ensuring that both bright highlights and dark shadows are accurately represented in the final image. The mathematical definitions associated with HDR image acquisition provide a framework for understanding how the optoelectronic conversion function (OECF) is measured and analyzed. This function is critical for evaluating the performance of different HDRC imagers, as it quantifies how well the sensor converts incoming light into electrical signals across varying light conditions.

In discussing specific sensor parameters, attention is drawn to the pixel design employed in global shutter readout. This design is crucial for applications where motion blur must be minimized, as it allows all pixels to capture an image simultaneously, rather than sequentially. Such a feature is particularly beneficial in fast-paced environments, like industrial safety monitoring, where rapid movement may occur.

The applications of HDRC imagers extend into various fields, with a particular emphasis on industrial safety. The SafetyEYE stereo camera system exemplifies the practical implementation of HDRC technology in this domain. By utilizing global shutter sensors, SafetyEYE enhances the ability to monitor three-dimensional spaces safely and accurately. This capability facilitates the development of flexible safety solutions that can adapt to diverse operational conditions, surpassing the limitations of traditional safety guard systems. The integration of HDRC technology in safety applications highlights the potential for improved safety measures and operational efficiency in industrial settings.The first part of this paper describes the high dynamic range CMOS (HDRC ®) imager a special type of CMOS image sensor with logarithmic response. The powerful property of a high dynamic range (HDR) image acquisition is detailed by mathematical definition and measurement of the optoelectronic conversion function (OECF) of two different HDRC imagers.

Specific sensor parameters will be discussed including the pixel design for the global shutter readout. The second part will give an outline on the applications and requirements of cameras for industrial safety.

Equipped with HDRC global shutter sensors SafetyEYE ® is a high-performance stereo camera system for safe three-dimensional zone monitoring enabling new and more flexible solutions compared to existing safety guards. 🔗 External reference