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SI-6600-M & RGB MegaCamera™ 6.6 Megapixel, 10-Bit, 60MHz Ultra-High Resolution Portrait Digital Camera |
Silicon Imaging Inc.
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Silicon Imaging is
proud to continue its innovation in ultra-high resolution machine vision
camera.
Driven by the growing demand for consumer Digital Still Cameras,
CMOS sensors are continuing to break technical barriers and surpass the
performance characteristics of CCD’s in many photonic, imaging and
consumer applications. By
utilizing a single highly integrated CMOS device, which incorporates
Megapixel sensing areas, timing generation, signal processing and high
bandwidth outputs, Silicon Imaging has developed a very compact,
low-power, ultra high speed Megapixel digital camera system. 2210
x 3002 Megapixel - Ultra Resolution 10-Bit
Pixel Sampling – Sub-Pixel Accuracy 1000
FPS - Windowing & Subsampling Dual Slope Exposure - “Super-Dynamic” CameraLinkä
Digital Interfaces GigE-Cameralink – Gigabit Ethernet Connectivity Now you can capture high-speed MegaCamera images to your PC from distance of a 100-meters using CAT-5 wire using the Silicon Imaging GigE-CameraLink Interface. The GigE-Cameralink captures MegaCamera digital images and transmits them via 10/100/1000 Gigabit Ethernet directly to your PC at speeds over 100MB/sec.
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6.6
Megapixel CMOS Image Sensor
The
MegaCamera SI-6600 utilizes a proprietary portrait style 6.6 Million pixel
high-speed CMOS image sensor. Each pixel is 3.5um square, ideal for image processing, and
the entire array fits the 1” format for flexible optic choices.
This reduction in process geometry allows for both an increase in
transistors and fill factor without compromising performance, plus offers more
advanced readout controls, greater speeds and lower power dissipation.
This new sensor technology offers a more responsive pixel design with
added circuitry for increased dynamic range, greater sensitivity, decreased
fixed pattern noise and low dark current for
long exposure applications. Unlike
CCD, which leak charge to adjacent pixels when the registers
overflow (blooms), the SI-6600 provides inherent
anti-blooming protection in each pixel,
so that there is no blooming. The
array has 2210 pixels on a line and 3002 rows, which result in a near 3:4
portrait aspect ratio. The SI-6600
outputs 2208 x 2960, using 42 rows for interframe blanking.
The image can be rotated 90-degrees to obtain a 4:3 image. In addition,
by using the windowing feature, a 16:9 aspect ratio (eg. 1280x 720) or 1:1
aspect ratio (1024 x 1024) are available. At smaller ROI sizes (eg. 128 x 128)
frame rates in excess of 1000fps.
The
SI-6600 MegaCamera achieves high data rates by simultaneously accessing two
adjacent pixels at a time and reading them out sequentially.
These pixel values feed thru a gain & offset amplifier and then to
on-board dual 10-Bit A/D converters and placed onto a 12-bit data bus for
transmission. The entire
imager field of view can also be readout using subsampling.
In this mode, 2 pixels are readout and a group of pixels are skipped.
As fewer pixel are output, the frame rate increases In
a color model, a Bayer filter covers each of the pixels to produce a pattern of
values that represent the color information, which must be processed and
interpolated to obtain an RGB value per pixel.
The 12-bit output format from the camera is identical for monochrome and
color models. The camera sensor is light
sensitive between 400 and 1000 nm. The peak QE * FF is 22.5% approximately
between 500 and 700 nm. In view of a fill factor of 35%, the QE is thus close
to 70% between 500 and 700 nm.
The figure above shows the pixel response curve in linear response mode. This curve is the relation between the electrons detected in the pixel and the output signal. The resulting voltage-electron curve is independent of any parameters (integration time, etc). The voltage to electrons conversion gain is 37 µV/electron. 10-Bit Digital Sampling System A
10-Bit Analog-to-digital (A/D) converter samples each pixel value and quantizes
it into 1024 levels, as it is clocked out of the sensor. Pixel clock sampling ensures precise measurement of the
photonic charge without the jitter and sampling uncertainty associated with
traditional analog video systems, such as RS-170 and CCIR.
The camera produces images which can deliver improved photometry accuracy
and sub-pixel metrology. The use of 10-bit converters versus traditional 8-bit
systems further enhances the image dynamic range.
The combination of 10-bit vertical resolution and pixel clock sampling
provide precise sub-pixel measurement accuracy (ex. 1/10 pixel).
Digital Clock Synthesizer
A wide range a master clock frequencies (eg. 20 to 60MHz) can by precisely generated using the Digital Clock Synthesizer. The Frame Grabber, which is used with the camera, must be capable of receiving 12bit at 60Mhz to achieve the highest data rates. Without any byte packing of the 12-bit word the data rate would be 120MHz (2pixel x 2bytes/pixel x 60MHz). In standard 32Bit/33MHz PCI computers the maximum data rate directly to host memory is usually below120Mbytes/sec (from 132MB/sec bus) without system interrupts. However, 100MB/sec is more reasonable rate to achieve with other system devices operating (eg. display, clock, mouse etc.). Under these condition the 12-bit data can be mapped to 8-bits/pixel to reduce the bus traffic or the clock rate can be reduced to and still maintain 12bits/pixel. The frequency of the clock synthesizer can be set by serial command. A table with associated clock frequency is found in the seria | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
