Sony are developing a new CCD with 4-colour (Red R, Green G, Blue B + Emerald
E) filters, together with a new image processor corresponding to the 4-colour
filter. By this technology, Sony say the colour reproduction error is halved
compared to their conventional 3-primary-colour filter CCD and, expression of
images closer to the natural sight perception of the human eye is achieved under
various shooting conditions.
Conventional digital still cameras mainly use 3-primary-colour filter CCD,
and the colours are recorded by the intensity of each of the 3 colours, Red(R),
Green(G) and Blue(B), corresponding to the colour reproduction characteristics
of the colour TV or monitors. However, the characteristics of these CCD filters
are different from those of the human visual system. colour differences therefore
emerge compared to natural human sight, resulting in different colour reproduction.
In the 4-colour filter CCD, a filter with the Emerald (E) colour is added to the
conventional 3-colour RGB filter, in order to reduce the colour reproduction errors
and to record natural images closer to the natural sight perception of the human
eye. As a result, the characteristics of the CCD colour filter become much closer
to those of the human visual system, achieving dramatic reduction in the colour
|In addition to the development of
the 4 colour filter, a new image processor corresponding to the 4-colour
filter has been developed. With this processor, each of the signals captured
by the 4 colours is processed to produce ideal 3 colours close to the natural
sight perception the human eye by a matrix calculation. Also, in addition
to functioning with 30% less power consumption, by the efficient processor
management, functions such as high-speed image shooting and high-speed playback
are realized, as well as enhancing the of overall basic functions of digital
New image processor
By the combination of the 4 colour filter CCD and the new processor, colour reproduction
errors have been minimized by half, and the reproduction of blue-green and red
colours has been particularly enhanced.
Sony plans to integrate the newly developed 4 colour filter CCD and the new image
processor into the new digital cameras which will be introduced in the near future.
This unique Sony original technology will offer the capability to shoot images
with enhanced reality.
Photo produced by conventional technology
Photo produced by new technology