High dynamic range

About: High dynamic range is a research topic. Over the lifetime, 4280 publications have been published within this topic receiving 76293 citations. The topic is also known as: HDR.

Methods and Systems for Converting Images from Low Dynamic to High Dynamic Range to High Dynamic Range

Abstract: Aspects of the invention provide systems and methods for converting a digital image represented in a lower bit depth representation to a higher bit depth representation. A saturation region is identified, where a color model value of the pixels in the saturation region is above an upper saturation threshold or below a lower saturation threshold. The color model value for each pixel in the saturation region is then adjusted by a corresponding adjustment. The magnitude of the adjustment for each pixel is based on characteristics of the image data.

Minimum-Error Splitting Algorithm for a Dual Layer LCD Display—Part II: Implementation and Results

Abstract: A dual layer liquid crystal display (LCD) is able to achieve a high dynamic range by stacking two liquid crystal panels one on top of the other over an enhanced backlight unit. However, the finite distance between the two panels inevitably introduces a parallax error when the display is observed off-axis, and the dynamic range limitations of the individual panels introduce a reconstruction error near sharp edges in the input image. In Part I, we have formulated the image splitting as a constrained optimization problem in which a joint minimization of the parallax error and the visibility of the reconstruction error is performed.

An on-pixel FPN reduction method for a high dynamic range CMO S imager

Abstract: A high dynamic range CMOS image sensor implementing a fixed pattern noise (FPN) reduction method is presented. The high dynamic range is reach through a logarithmic architecture pixel. An on-chip calibration method is implemented to reduce the FPN caused by process variations, weakness of this architecture. The basic principle is the calibration of each pixel against an in-pixel reference current in place of the diode photocurrent. Two pixel levels corresponding to the photocurrent and a known reference current become available for every pixel Then a double sampling technique allows removing offsets due to threshold voltage variations. An innovation of this work consists in the implementation of the current calibration source totally inside the pixel, allowing a better precision of the FPN compensation and lower power consumption. This FPN reduction method is performed while keeping only four transistors per pixel. A 128times128 pixels test chip has been designed and fabricated in 0.35 mum, 3.3 V CMOS standard technology. Pixel measures 10times10.6 mum2 with a fill factor of 33%. The dynamic range is up to 100dB with a frame rate up to 30 images per second and a measured FPN of 2.9% rms of the total dynamic range.

Method, apparatus, and system providing multiple pixel integration periods

Abstract: A method, apparatus and system providing high dynamic range operation for an image sensor by using signals from multiple pixels having different integration times.

High-speed high dynamic range resonant SAW torque sensor for kinetic energy recovery system

Abstract: The torque sensor capable of working in the extreme environment of race cars has been developed for the Fl kinetic energy recovery system. The sensor was based on two SAW sensing elements containing five one-port resonators that were attached to the KERS shaft. The achieved dynamic range of the sensor was 69 dB, the update period was 310 es and it could work at the rotational speed up to 18000 rpm and temperatures up to 160°C. The mechanical design of the sensor ensured its small size and provided sufficient mechanical robustness allowing to survive very intense vibrations. Despite its small diameter, the non-contact rotary RF coupler connecting the sensor to the interrogation unit ensured strong enough SAW response at its input, very small rotational errors and small sensitivity to the axial movement. A number of changes in the interrogation algorithm, in particular, in the frequency tracking procedure, significantly improved stability of the sensor performance in dynamic regime. At the end of the development stage, the sensor successfully worked on race cars.