The Fujifilm X-Trans is a sensor developed by

Fujifilm , trading as Fujifilm, or simply Fuji, is a Japanese multinational conglomerate headquartered in Tokyo, Japan, operating in the realms of photography, optics, office and medical electronics, biotechnology, and chemicals. The offerings from ...

and used in its

Fujifilm X series The Fujifilm X series is a line of digital cameras produced by Fujifilm. The series encompasses fixed lens and interchangeable lens mirrorless cameras and premium compact point-and-shoot cameras aimed at consumer, enthusiast and professional ph ...

cameras. Unlike most sensors featuring a conventional

Bayer filter A Bayer filter mosaic is a color filter array (CFA) for arranging RGB color filters on a square grid of photosensors. Its particular arrangement of color filters is used in most single-chip digital image sensors used in digital cameras, ca ...

array, X-Trans sensors have a unique 6 by 6 pattern of photosites. Fujifilm claims that this layout can minimise moiré effects, and in turn increase resolution by eliminating the need for a low-pass filter.

Details

Typical Bayer sensor arrays have RGB photosites in a repeated 2 by 2 pattern. When it overlaps with a regular pattern that is being captured, a new interference pattern can occur that does not exist in real life. In contrast, X-Trans sensors have a more randomised pattern of RGB photosites than conventional Bayer array sensors, reducing the likelihood of interference and removing a need for a low-pass filter that lowers image resolution. See U.S. Patent 8,531,563. Conventional Bayer sensors can also produce false colour as they do not have R and B photosites in some horizontal and vertical lines, Fujifilm claims that X-Trans sensors on the other hand have an improved colour reproduction due to all horizontal and vertical lines containing at least one R, G and B pixels. Fuji claims that

APS-C Advanced Photo System type-C (APS-C) is an image sensor format approximately equivalent in size to the Advanced Photo System film negative in its C ("Classic") format, of 25.1×16.7 mm, an aspect ratio of 3:2 and Ø 31.15 mm field ...

sized X-Trans sensors, while being physically smaller, have a greater perceived resolution than the number of pixels on the sensor and are said to be on par with some

full frame Full frame may refer to: * 35mm format * Full frame (cinematography) * Full-frame type charge-coupled device (CCD) image sensor See also * Full-frame digital SLR * Full-frame mirrorless interchangeable-lens camera A mirrorless camera ...

sensors. X-Trans sensors are said to be manufactured for Fujifilm by

Sony Corporation , commonly stylized as SONY, is a Japanese multinational conglomerate corporation headquartered in Minato, Tokyo, Japan. As a major technology company, it operates as one of the world's largest manufacturers of consumer and professional ...

. While the first three generations of X-Trans sensors are front-illuminated, the fourth generation uses the principle of

backside illumination Comparison of simplified back-illuminated and front-illuminated pixel cross-sections A back-illuminated sensor, also known as backside illumination (BI) sensor, is a type of digital image sensor that uses a novel arrangement of the imaging elemen ...

. This improves noise levels and image quality.

Drawbacks

Image artifacts

Under certain conditions, cameras equipped with X-Trans II and III sensors can exhibit purple flare/grid artifacts in backlit photos. This occurs due to the particular arrangement of the phase detection and masking layers on the sensor. The appearance of the effect can vary with the demosaicing algorithms in use.

Future development

In an interview with DPreview during the CP+ 2017 show in

Yokohama, Japan is the second-largest city in Japan by population and the most populous municipality of Japan. It is the capital city and the most populous city in Kanagawa Prefecture, with a 2020 population of 3.8 million. It lies on Tokyo Bay, south of ...

Fujifilm confirmed that an X-Trans sensor array is to be used for its next generation of APS-C sized sensors, whilst larger medium format sensors will continue using a conventional Bayer array because of the increased processing requirements of X-Trans filter arrangement.

List of X-Trans sensors

References

{{Reflist Fujifilm Digital photography Color filter array