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Fujifilm Super CCD EXR Sensor

Fujifilm Super CCD EXR SensorFujifilm have unveiled Super CCD EXR, a new ‘three-in-one’ sensor for high resolution, high sensitivity and wide dynamic range. Fujfilm’s ultimate aim is to “produce a sensor that works as close to that of the human eye as possible.” The Super CCD EXR sensor attempts to achieve this by using a new arrangement of the mosaic colour filter, with two side-by-side, same-coloured pixels taken together as a single pixel (so-called Pixel Fusion Technology). The Super CCD EXR sensor capture two images of the same scene, one taken at high sensitivity and the other at low sensitivity, and then merges the two images to generate a photo that has excellent depth and range (Dual Capture Technology). Finally, the structure of the new Super CCD EXR exploits all the pixels in the layer beneath the new colour filter matrix and takes advantage of the optimised signal processing of the new RP processor to create an image with the highest possible resolution quality (Fine Capture Technology). The first camera with the new sensor is likely to be a “premium compact” model and be available early next year.

At a press conference held at Photokina today, Fujifilm’s Adrian Clark shed some more light on their new Super CCD EXR chip. In his words, EXR stands for “Extreme”, as Fujifilm claim the new sensor “takes image capture to new extremes”. The new imager will be a “switchable” one, enabling photographers to decide whether they want to give priority to high resolution, high dynamic range or low noise at high ISOs, without having to carry three separate cameras along.

So if your main goal is capturing the finest detail possible, you can choose “Fine Capture Technology” to use all the pixels on the sensor for maximum resolution. If, however, you are forced to shoot in contrasty light, and your priority is capturing detail in both the highlights and the shadows, you can opt for the use of “Dual Capture Technology”, in which half of the sensor photosites are used to record an image at one exposure and the other half to capture the same shot, at the same time, at a different exposure. These two exposures of the same scene are then combined into a single photo. If this sounds familiar, it’s because this technology is quite similar to the one implemented in former Super CCD SR sensors, the difference being that in the EXR imager, all photosites are the same size which, according to Fujifilm, “means the potential for widened dynamic range is even greater”. Finally, if you are working in low-light conditions, shooting at high ISOs, and your main objective is to avoid noise taking over your picture, then you can engage “Pixel Fusion Technology”, which is apparently a new approach to pixel binning, and is the primary reason for the new colour filter array in the EXR sensor. The new arrangement makes it possible to combine two adjacent pixels of the same colour to form a single “super-pixel”. This allows false colours, common with traditional pixel binning, to be avoided.

According to Mr Clark, it seems that future cameras built around the Super CCD EXR imager will have the ability to automatically determine, based on an analysis of the lighting, if “Dual Capture” or “Pixel Fusion Technology” need be applied, although we are confident that this will be made user selectable as well.

Fujifilm UK Press Release

Revolutionary sensor blazes the way to a new era of high image quality

Announcement Date: 22 September 2008

“Super CCD EXR” - A ‘three-in-one’ sensor for high resolution, high sensitivity and wide dynamic range

Made by photographic specialists for photographic specialists

PHOTOKINA 2008, COLOGNE, GERMANY, September 23, 2008 -FUJIFILM Corporation, on the anniversary of 10 years of FinePix cameras, has developed “Super CCD EXR,” a revolutionary new sensor developed in the rigorous pursuit of high image quality.

There is strong demand in the digital camera market to increase the number of pixels on a sensor, which, all too often, is used as a convenient yardstick for image quality. While introducing excellent 12-megapixel cameras such as the FinePix F50fd and the FinePix F100fd, Fujifilm has had great success in increasing pixel density while at the same time controlling noise and optimising sensitivity. Fujifilm’s campaign to improve overall image quality, while at the same time increasing sensor resolution, has been coordinated under the program of ‘Real Photo Technology.’

‘Real Photo Technology’ is underpinned by the belief that experienced photographers, many brought up using famous reversal films like FUJICHROME Velvia or PROVIA, understand that true image quality is about a combination of many factors like tone, hue, colour fidelity, dynamic range, sharpness, and resolution. It is well known that increasing the pixel count on a sensor actually makes it more difficult to achieve high sensitivity and wide dynamic range. As the photodiode gets smaller, the problems of increased noise, blooming and clipping increase.

It is widely believed that ‘high resolution’ and ‘high sensitivity’ are irreconcilable opposites, and impossible to optimise on the same sensor, particularly for compact cameras, where sensors are necessarily smaller.

High quality pictures are dependent on the subject. Excellent low light pictures need high sensitivity; high contrast pictures need wide dynamic range, while fine details, like the leaves of a tree or strands of a model’s hair, depend on high resolution.

Fujifilm engineers set about the task of building a flexible sensor to match the demands of the photographer. The end-goal is to produce a sensor that works as close to that of the human eye as possible. Whatever nuance of colour or sensitivity of tone that makes the scene so special to the photographer should be the continual challenge of the sensor engineer. The EXR sensor is essentially a switchable sensor; changing its complex electronic behavior to suit the subject, changing its characteristics as the photographer demands, and producing the very best picture without making compromises.

“Super CCD EXR” is the latest new generation of Super CCD to be produced by Fujifilm. Over the years, Fujifilm has excelled in high resolution sensors through ‘HR’ technology (F50fd, F100fd) and high sensitivity/wide dynamic range through ‘SR’ sensors (S3 Pro, S5 Pro). The direction in the future will be to combine HR and SR technology together to produce one universal sensor suitable for all high quality photography.

The Technology of Super CCD EX

Super CCD EXR offers three main changes from previous Fujifilm sensors:
1. A new arrangement of the mosaic colour filter
2. A new method of pixel binning
3. A complete revision of the electronic charge control

1. EXR: ‘Pixel Fusion Technology’ for High Sensitivity and Low Noise
Boosting sensitivity by increasing gain causes the generation of random increased noise, and conventional efforts to control this noise have resulted in blurred images and loss of resolution. On the other hand, a low-noise signal can be obtained by pixel binning. However, the conventional approach to binning (along the horizontal and vertical axis) generates false colours because of the separation of pixels of the same colour. Because it is necessary to suppress this phenomenon, the result is a significant drop in sharpness.

EXR changes the colour filter arrangement. Two side-by-side, same-coloured pixels are taken together as a single pixel. With this design, the area of imaging elements is doubled, the sensitivity is twice the normal level, and ‘dark noise’ is extremely small. Therefore, it is possible to create a high sensitivity image with little noise, instead of increasing the gain from a single pixel and increasing the noise.

Another problem with traditional pixel binning is the distance between same-coloured pixels. Since the pixels are combined vertically or horizontally, the distance between combined same-colour pixels is large, resulting in the generation of false colours. Boasting a new technology called Close Incline Pixel Coupling, the new Super CCD EXR can prevent the generation of false colours by mixing two adjoining pixels as one, and managing to achieve both low noise and excellent sharpness.

2. EXR: ‘Dual Capture Technology’ for Wide Dynamic Range
Super CCD EXR uses flexible and high-precision exposure control to simultaneously capture two images of the same scene: one taken at high sensitivity and the other at low sensitivity. It then merges the two images to generate a photo that has excellent depth and range.

Previously, Fujifilm used two different methods to improve dynamic range. The first was Super CCD SR. Through the adoption of a “double pixel structure” based on silver halide film, which comprises an “S pixel” with a large area and high sensitivity and an “R pixel” with a small area, a dynamic range four times that of conventional sensors was achieved. The second was based on Super CCD HR, where the gradation of shadows was gradually adjusted while raising the sensitivity of signal processing, and where highlights were softened to delineate an optimal curve. Similar to Super CCD SR, the new EXR sensor uses Dual Exposure Control to impart two differing sensitivities by controlling the light exposure time (the time in which charge accumulates).

Unlike SR, the imaging elements are the same (large) size, which means the potential for widened
dynamic range is even greater, and facilitates a greater spectrum of graduated expression

3. EXR: ‘Fine Capture Technology’ for High Resolution
The distinctive structure of the new Super CCD EXR fully exploits all the pixels in the layer beneath the new colour filter matrix and takes advantage of the optimised signal processing of the new RP processor to create an image with the highest possible resolution quality. Even though the sensor has been designed for ‘Dual Capture’ for Wide Dynamic Range and ‘Pixel Fusion’ for Low Noise, it actually performs as well as previous 12-megapixel Super CCD sensors due to the new filter and photodiode design.

When light is full and even, and when fine detail is required, EXR can deliver exquisite detailed expression for landscape or architectural photography, and render the finest details of clothes, hair or jewellery in portrait photography.

EXR: The Future
Fujifilm is determined to use decades of imaging know-how gained through the development of film to push the boundaries of what is possible to achieve with an imaging sensor. The market for digital cameras is only around a decade old, and Fujifilm believes that it is possible to follow the holy grail of ‘absolute image quality’ in the domain of electronic imaging, just as it did with conventional imaging. With EXR, Fujifilm can choose one engineering direction, rather than developing separate sensors for high sensitivity and high resolution. Fujifilm looks forward with excitement to introducing this sensor into its range of high quality cameras, and expects enthusiasts to see a quantum leap in image quality from anything they have seen before.

Fujifilm Super CCD EXR Sensor

Published: Tuesday, September 23, 2008

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Reader Comments

  1. Looks like a bless for a wedding photographer. I wonder how this sensor compares to the new CMOS sensors from Canon.

    Aleksy at 12:13pm on Tuesday, September 23, 2008

  2. @ Aleksy: from the comments on the new technology by Fuji engineers, it seems they only aim this technology at compact cameras, so not really targetted for wedding shooters.

    About the article, the f50 and f100 have clearly shown decreasing image quality compared to others like the f31 due to pixel density. So no, noise wasn't that well contained.

    Now lets guess who is telling us lies. a) In this article:
    "capture two images of the same scene: one taken at high sensitivity and the other at low sensitivity"

    b) At dpreview: (
    "A dual readout system on the chip allows alternate pixels to be read-out part-way through the exposure. This means that half of the photodiodes are only exposed for a short period of time."

    Increasing/decreasing sensitivity (amplifier's gain) isn't quite same as reducing/extending exposure time. And the second can cause artifacts on moving subjects I guess.

    Who is lying? a? or b?

    pixel0rs! at 12:05am on Wednesday, September 24, 2008

  3. I read all about Super CCD EXR on DP.Below image summarizes the idea lies behind.Something like in camera HDR processing to get better DR and fine detail.(does not mean better iso and color accuracy)let us wait and see the images taken with sensor.I must say I haven't got big hope about...

    Mustafa Ajlan Abudak-Turkey at 12:40am on Wednesday, September 24, 2008

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