Topic
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.
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01 Nov 2004
TL;DR: In this article, a new CMOS APS using standard CMOS logic technology is proposed to allow high dynamic range operation, which is constructed by incorporating one additional transistor to the conventional three transistor APS.
Abstract: A new CMOS APS using standard CMOS logic technology is proposed to allow high dynamic range operation. The new cell is constructed by incorporating one additional transistor to the conventional three transistor APS. The experimental results demonstrate that extended dynamic range is obtained when operates with a ramped reference voltage source. The cell offers flexible nonlinear transfer characteristics, which can be designed by modifying the operational timing diagram. Furthermore, charge collection on the parasitic capacitor allows for the use of the signal due to hole accumulation. An alternative operation of this cell is also proposed to provide enhanced characteristics in both its sensitivity and dynamic range.
16 citations
Patent•
12 May 2009TL;DR: In this article, the luminosity of individual LED light sources is measured and a forward voltage control of each LED is set so that each LED has a pre-determined (e.g., uniform) luminosity at a same modulation level.
Abstract: Luminosity of individual LED light sources is measured and a forward voltage control of each LED is set so that each LED has a pre-determined (e.g., uniform) luminosity at a same modulation level. The LEDs are then driven via a modulation technique such as PWM, PCM, polyphase, etc. according to lighting requirements. The LEDs are, for example, a backlight of a dual modulation HDR LCD display system, and the lighting requirements are local dimming signals for the display.
16 citations
TL;DR: In this paper, a new impulse-type display named Local Blinking High Dynamic Range (HDR) LCD System was proposed, which utilized local dimming technology to achieve a local blinking effect that suppressed motion blur and reduce Moving Picture Response Time (MPRT) to 3.89 ms.
Abstract: A new impulse-type display named Local Blinking High Dynamic Range (HDR) LCD System was proposed, which utilized local dimming technology to achieve a local blinking effect that not only suppressed motion blur and reduce Moving Picture Response Time (MPRT) to 3.89 ms but also applied local image compensation to maintain image brightness and details without substituting high power light source. In addition, the intrinsic advantages, such as high dynamic range (high contrast ratio) and low power consumption were also achieved.
16 citations
01 Jun 2022
TL;DR: In this paper , the authors modify NeRF to instead train directly on linear raw images, preserving the scene's full dynamic range and rendering raw output images from the resulting NeRF, which can perform novel high dynamic range view synthesis tasks.
Abstract: Neural Radiance Fields (NeRF) is a technique for high quality novel view synthesis from a collection of posed input images. Like most view synthesis methods, NeRF uses tonemapped low dynamic range (LDR) as input; these images have been processed by a lossy camera pipeline that smooths detail, clips highlights, and distorts the simple noise distribution of raw sensor data. We modify NeRF to instead train directly on linear raw images, preserving the scene's full dynamic range. By rendering raw output images from the resulting NeRF, we can perform novel high dynamic range (HDR) view synthesis tasks. In addition to changing the camera viewpoint, we can manipulate focus, exposure, and tonemapping after the fact. Although a single raw image appears significantly more noisy than a postprocessed one, we show that NeRF is highly robust to the zeromean distribution of raw noise. When optimized over many noisy raw inputs (25–200), NeRF produces a scene representation so accurate that its rendered novel views outperform dedicated single and multi-image deep raw denoisers run on the same wide baseline input images. As a result, our method, which we call RawNeRF, can reconstruct scenes from extremely noisy images captured in near-darkness.
16 citations
Patent•
03 Mar 2014TL;DR: In this paper, a method of generating a first high dynamic range digital image from second and third digital images of a same scene, including, for at least one point of the first image: determining a brightness index; comparing this index with at least the first, second, third, and fourth decreasing thresholds stored in a memory; and determining the value of the point by taking into account the index.
Abstract: A method of generation, by a digital processing device, of a first high dynamic range digital image from second and third digital images of a same scene, including, for at least one point of the first image: determining a brightness index; comparing this index with at least one of first, second, third, and fourth decreasing thresholds stored in a memory; and determining the value of the point by taking into account the value of the index.
16 citations