ARRI News September 2009 - ARRI Media

More documents

Recommendations

Info

08 Camera > > > The ARRI Digital Camera System > > > > within the camera. Employing relatively large pixels means we are not forced to use data compression for the ARRIRAW outputs, and thus can provide uncompressed and uncompromised image quality. Given the requirements to create a single 35 format sensor with HD/2k output, a 8.25µm pixel size (an unusually large pixel in today’s world of tiny cell phone sensors) and a 3.5k pixel count was found to provide the optimum image quality. From a 3.5k sensor the camera can generate the highest quality images in HD video or 2k DI, a concept that has been proven by the D-21 for years. It does this through oversampling, whereby more pixels are captured from the sensor than are required for the output format, and the image is downscaled by the image processing firmware. For example, 2880 x 1620 sensor pixels are down sampled to 1920 x 1080 for the HD outputs, or 3072 x 1728 sensor pixels are down sampled to 2048 x 1152 for a 16:9 2k DI. The A-OV Plus camera will be able to use respectively more pixels for 4:3 formats from the total sensor pixel count of 3392 x 2200. To provide some extra area around the primary image in the ARRI Electronic Viewfinder, 10 percent more pixels have been added on the sensor for each respective format. ALEV III sensor prototype A first test image taken with the ALEV III sensor prototype and, for comparison, with “competitor A” ALEV III sensor prototype An enlargement shows the differences in the image structure. Higher sensitivity and a wider ALEV III sensor prototype It is common practice during color timing to use power windows to get the most out of the captured images. The incredible exposure latitude of the ALEV III sensor prototype provides an enormous amount of information even in the darkest parts of the image, where other cameras
The ARRI Digital Camera System > > > > competitor A competitor A exposure latitude provide significantly cleaner images when shooting in low light. competitor A just see black. This translates into more creative choice during color timing, as well as the ability to “fix” underexposed images to a far greater extend than previously possible. High Sensitivity and Wide Exposure Latitude Higher sensitivity and a wider exposure latitude expand the cinematographer’s toolset for greater flexibility and efficiency on the set. In addition, they also greatly reduce effort and cost during post production, when attempting to get the most out of the captured images. The new ALEV III prototype sensor already shows a sensitivity of 800+ EI equivalent and an extremely wide dynamic range. To achieve such performance, the inherent advantages of the larger pixels have been combined with a number of novel techniques, including a special sensor design called Dual Gain Architecture (DGA). For highest sensitivity and lowest noise in a CMOS sensor, a high gain must be applied in the early stages of the readout path. However, this high gain sacrifices some highlights because the voltage swing on the readout path is very limited. As a result, highlights get clipped. To overcome this problem, DGA provides two separate signal paths from each pixel to the A/D converters, each path with different amplification (gain). The first read out path contains the regular, high gain signal. The signal in the second readout path has significantly lower gain, and thus can capture the information that is clipped in the high gain path. The camera’s 14 bit A/D converters then deliver two 14 bit images, that are re-combined to a single 16 bit high dynamic range image. Dr. Achim Oehler, Michael Cieslinski, Marc Shipman-Mueller Camera 09
Page 1 and 2: 09/2009 A NEW DIGITAL CAMERA SYSTEM
Page 3 and 4: Dear Friends and Colleagues Dr. Mar
Page 5 and 6: Camera System Product code name: k
Page 7: The ARRI Digital Camera System > >
Page 11 and 12: The ARRI Digital Camera System > >
Page 13 and 14: photo: Johannes Christian Michel AR
Page 15 and 16: The first Mscope feature soon clear
Page 17 and 18: ADAM is an unconventional romantic
Page 19 and 20: Philippines: D-21 production KINATA
Page 21 and 22: uilt into the ARRI HD-IVS Bildunter
Page 23 and 24: Go Wide, Wild and Wet Underwater Ci
Page 25 and 26: 00:00:25:00 00:00:30:00 00:00:35:00
Page 27 and 28: ARRICUBE Creator Package about why
Page 29 and 30: The effects of the Doubleflash tech
Page 31 and 32: First ARRISCAN in Ukraine In recent
Page 33 and 34: PAX performs on stage at Austria's
Page 35 and 36: ARRI lamps used for stills photogra
Page 37 and 38: Does the EB 1200/1800 have Active L
Page 39 and 40: Workshop for distributors at ARRI L
Page 41 and 42: ves to New Premises entative in Alm
Page 43 and 44: ARRI CSC, the largest full service
Page 45 and 46: to UNA SEMANA SoLoS Children betwee
Page 47 and 48: ARRI CSC ARRI LAB - TVDrama ARRI Co

ARRI News September 2009 - ARRI Media

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?