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Instead, better sensors are required, those which have the ability to capture a wider range of signals in a single exposure, some of which are now available in professional video cameras.

Therefore, this technique is very difficult to apply to video, where by its nature, there will be motion. This technique can be very effective in still photography, however, it does require that there is no motion between the various exposures, otherwise significant blurring will occur in the final image. Tone mapped image of Mirror Lake (Image Courtesy of Mark Fairchild) This image is more natural and colourful, and more representative of the true scene.

These images can then be intelligently combined or ' tone mapped' to provide an image with good detail in all parts of the image. The lowest exposures, which in this case are the first 3 images at the top, capture the details in the highlights, while the highest exposures, which are the bottom 3 images, capture the details in the lowlights (note the bright area void of any details in the highest exposure). The “HDR mode” process involves taking multiple captures of the images at different exposures (usually 3 or more). Multiple exposures of Mirror Lake (Image Courtesy of Mark Fairchild) As seen in this example from Mark Fairchild. To overcome the shortcomings of the image sensors, many digital cameras and smart phones come equipped with a “HDR mode”. Those who commonly take pictures on a digital camera may be familiar with the problem of capturing both bright and dark parts of the picture and maintaining high levels of detail in both of these areas. The dynamic range of a video signal is the range between the lowest and highest light level. So it is no wonder that high brightness HDR images are so eye-catching. That is not just marketing: the “Hunt effect” is a well-known phenomenon whereby the colourfulness of an object increases with luminance and video engineers have always known that increasing the contrast of an image makes it appear sharper as the gradient of edges increases. They are more realistic, more colourful, subjectively sharper and more engaging than standard dynamic range (SDR) images.

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Those who have been lucky enough to see High Dynamic Range (HDR) TV pictures cannot help but be blown away by their impact.

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These may include a higher spatial resolution (more pixels on the screen), a higher frame rate (more pictures per second), wider colour gamut (more colours than before), and higher dynamic range.īBC R&D - Defining the Future of TelevisionīBC R&D - How to Adjust Your TV to Enjoy the Best Picture Quality in HDRīBC R&D - High Frame Rate TV at the Commonwealth GamesĪs BBC R&Ds Andrew Cotton recently wrote in an article for DVB Scene: London New Year's Eve Fireworks 2014/2015 Highlights (This video clip is not UHD/HDR!) What is HDR?īBC R&D is investigating a wide range of technologies that may feature in the next generation of broadcast.

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