Antisthenes

Antisthenes

Lives in United States United States
Joined on Nov 9, 2010

Antisthenes' recent activity

  • Yes, that's the "Correlation coefficient" (CorrCf, in short) I meant :-) Re-reading what I wrote, I think a few refinements to the algorithm are in order. For example, the use of absolute values ...
  • Gosh. It seems we both had the same idea (based on collapsing lines by summing their pixel values) :-) You then, logically, use Fourier spectral methods to see if there are any periodic signals. I, ...
  • An extension of the previous idea — i.e. the use of simple descriptive statistics concepts like mean and variance to characterize banding. Assume we have a pixel array that is 100 pixels tall, and ...
  • Just thinking aloud here... Imagine an Excel spreadsheet that's 100 rows tall, and 200 columns wide; the idea is that this spreadsheet models an (admittedly quite low-res) 100x200 = 20000-pixel sensor.
  • A characteristic of a Dunning-Kruger person (google it up) is that, being ignorant in a domain — e.g. physics — he doesn't even realize that his gratuitous assertions have no relevant basis in the...

  • Also note that said Canon macro lens obviously cannot compensate for shake in the "roll" axis, as a lens only contains optical elements that are rotationally symmetric relative to the optical axis,...

  • Elsewhere in the industry, that kind of accelerometer (for measuring translational shifts when the subject distance is close) and gyroscope (for distant subjects) combination in an IS system...

  • Also note that gyroscopes can only measure the angular velocity caused by a rotation, and cannot indicate the precise location in 3D space of the rotation axis. As the camera shake's inherently...

  • Conceited, pontificating idiots like nerd2 don't even understand that an IS system must — regardless of whther it's in-body or in-lens — operate using TRANSLATION only. Any TILTING of the lens...

  • @armandino

    It doesn't seem to occur to you that there might be a disconnect between what you think your words communicate, and what they are actually "communicating".

  • > That the measurement is a statistic does not preclude assessing the uncertainty of the measurement.

    This indicates that you haven't really understood what a standard deviation, a fundamental...

  • Mansurov's logorrhea contain enough factual errors to show that: 1) he doesn't understand basic physical concepts of optics, energy, photonic noise or Poissonian statistics.  That's OK, and we ...
  • Are you talking about the perspective effect, when rendering a 3D scene as a 2D picture ? Users of, say, medium-format cameras who argue that a "standard" 80mm medium format lens will "draw", by ...
  • Er, in all my comments above, I've ultimately used DxO's "Print" DR method in my calculations, so that the noise averaging effect provided by high-resolution sensors is properly taken into account...

  • I should probably also add that smartphone pictures can be quite good e.g. in the mid-tones and lighter areas, where Poisson noise tends to dominate.

    Thus, pictures from MFT sensors, whose areas...

  • I should probably also add that smartphone pictures can be quite good e.g. in the mid-tones and highlights, where Poisson noise tends to dominate.

    Thus, pictures from MFT sensors, whose areas are...

  • Now, assume a medium-format sensor has a DR that is, say, 2EV less than our hypothetical FF sensor. The MF sensor's DR would then be 13.29EV - 2EV = 11.29EV
    Assume the MF sensor has a FWC that's...

  • Now, assume a medium-format sensor has a DR that is, say, 2EV less than our hypothetical FF sensor. The MF sensor's DR would then be 13.29EV - 2EV = 11.29EV, which implies a system noise sdev of...

  • We can easily calculate the number of electrons at the 4.5%, 2.25%, 1.125% etc. levels, to determine the number of divisions by 2 — i.e. EVs — we can go below the 18% level until the average level...

  • Imagine a hypothetical full-frame (24x36mm) sensor whose pixels have a full well capacity (FWC) of 50,000 electrons, and a combined system noise (read noise, ADC noise etc. etc.) whose standard...

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