Thursday, August 20, 2015

Canon C300 Mark II White Paper Talks About New Super 35mm Sensor

Canon publishes a white paper on its recently announced C300 Mark II 4K Digital Cinema camera and a new Super 35mm sensor in its heart:

"Canon R&D never stops and a totally new generation CMOS Super 35mm image sensor is the heart of the stunning imagery of the C300 Mark II. Further innovations within the second generation proprietary photodiode design in combination with on-chip noise cancellation technology have simultaneously lowered the noise floor and elevated the saturation level of the charge well. In addition, a totally new microlens design heightens the efficiency of light direction onto the individual photodiodes – a combination that achieves a more than two-fold increase in effective sensor dynamic range. This provides a definitive 15-Stop dynamic range capability in this new cinematography camera.

The more controlled noise floor allows the ISO range to be extended up to ISO 102,400. The Luma signal to noise ratio is a superb 67dB over a range of ISO settings. In the original C300 image sensor there were two fast readout modes – one, at 1/60 sec progressive and another at 1/120 sec interlace. The new image sensor in the C300 Mark II has a single readout capability of up to 1/120 sec progressive – further reducing rolling shutter skew effects.

"The C300 Mark II has a significant extension of dynamic range to 15-Stops – offering impressive HDR imaging capabilities – and the linear light digital representation for each of the 2K / HD video components is at a high 14-bit depth. This, in turn, allows for a far more favorable disposition of digital codes when mapping the nonlinear Opto Electronic Transfer Function (OETF) – a logarithmic curve termed Canon Log2.

An important extension was made to the Canon Log2 curve above the peak white level (the maximum level that can be delivered by the image sensor) – this being a 2-Stop continuation of the transfer function that is intended to support possible “push-pull” image manipulation in the color grading process.

1 comment:

  1. OETF ? - Defunct term, OR translation.

    ISO 14524

    Opto-Electronic Conversion Function (OECF): "The camera OECF is defined as the relationship between the input luminance and the grayscale or digital output from the camera, which was measured by using a test chart with twelve squares of various luminances." (copied from a Paper).

    Various Charts to measure 'Optical Properties' (including OECF, and not OETF):

    Is the different terminology a result of translation ?


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