Dual Digic Iii Image Processors - Canon EOS 1D Mark III - Digital Camera SLR User Manual

noise, the EOS-1D Mark III has a new feed-through output amp that attains both high
speed and low noise. Low noise is also achieved with an improved manufacturing process,
an optimized pixel amp and an optimized reading circuit.
As with the EOS-1D Mark II
employed. With a faster output amp and optimized read circuit,
a continuous shooting speed of approximately 10 fps is attained.
To minimize the higher power consumption required by the faster
signal reading, the output amp's power consumption has been reduced. Also, as in the
EOS-1D Mark II
standard current driving the circuit is also cut off to save power. In addition, during Live
View shooting, the power distribution for the signal-reading operation is optimized for
more pinpoint power-saving control.
Previously, in front of the sensor, there was an infrared-absorption glass integrated with
a three-layer, optical crystal plate for point image separation. However, for the Self
Cleaning Sensor Unit, the infrared-absorption glass is now separate from the three-layer,
optical crystal plate. This makes the dust-shaking plate lighter, saving power and
making it easier to control.
The infrared filter has a hybrid construction; it has an infrared-
absorption glass with multiple coatings to reflect infrared and
ultraviolet rays, the same construction found in EOS-1D series
cameras. It effectively reduces red fringing and color casts caused
by reflections of the sensor surface. The low-pass filter for point
image separation has a phase plate (which converts linear polar-
ization to circular polarization) sandwiched by two single crystal
plates. It is optimized for the sensor pitch so the light flux is
separated into the horizontal and vertical directions and the fine
horizontal- and vertical-line patterns are cleanly separated,
effectively reducing color artifacts such as moiré.
Dual DIGIC III Image DIGIC II, a high-performance imaging engine that has been used since the EOS-1D Mark II
Processors in 2004, has been a major feature of Canon digital cameras because of its very fine image
detail, natural color reproduction and high-speed signal processing. DIGIC III retains the
DIGIC II's basic concept and improves upon it with higher performance and faster speed.
To cope with the voluminous signal processing required by the EOS-1D Mark III's 10.10
megapixels and top continuous shooting speed of 10 fps, Dual DIGIC III Image Processors
are incorporated for parallel signal processing. The CMOS sensor reads out to the dual
DIGIC III Image Processors simultaneously in 8 channels.
III. IMAGE QUALITY IMPROVEMENTS
, single-line, 8-channel reading is
N
, during long exposures, power to the output amp is turned off and the
N
Time
Dichroic mirror
(Reflects infrared rays)
Infrared-absorbing glass
CMOS
sensor
Low-pass filter
(Separates image in vertical direction)
Phaser layer
(Converts linear polarized
light into circular polarized light)
Low-pass filter
(Separates image in horizontal direction)
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