Calculators

Signal to Noise Ratio Calculator

The Signal to Noise Ratio calculator provides you with a helpful tool to calculate the SNR of your camera set up. SNR characterizes the quality of a measurement. It is necessary to ensure that the signal level relative to noise is adequate to allow capture of accurate image information.

To use:

  1. Enter the Gain value for your camera. If you do not have it, please use the Mean Variance (Gain) calculator below
  2. Enter the grey level values (ADUs) for your signal.
  3. Enter the Read Noise for your camera. If you do not have it, please use the Read Noise calculator below.
  4. Enter the dark current value for your camera. This is normally available on the datasheet provided to you with the camera or on the Manufacturer’s website.
  5. Enter the exposure time of image.
  6. This will return with:
  •  The number of electrons in your signal
  •  The noise caused by dark current
  •  Total noise
  •  Signal to Noise Ratio
  •  Noise in grey scale values (ADUs)
Signal to Noise Calculator

Read Noise Calculator

Read Noise Calculator

The Read Noise calculator provides you with a helpful tool which allows you to calculate the read noise of your camera. 

The read noise is a measure of the uncertainty associated with each image acquisition and is a function of the camera system.

To use:

  1. Take the difference between 2 bias images.
  2. Enter the Standard Deviation of the pixels in the image.
  3. Enter the Gain value of the camera (e-/ADU)

If you do not have the gain value for your camera, use our Mean Variance (Gain) Calculator below

Dynamic Range Calculator

The Dynamic Range calculator provides you with a helpful tool which allows you to calculate the maximum dynamic range of your camera.

The Dynamic Range describes the ratio between the smallest and largest possible values the camera can quantitatively detect.

To use:

  1. Refer to the Datasheet or the Manufacturer’s website to find the Maximum Linear Full Well Capacity
  2. Use the Read Noise calculator above, enter the value of your read noise.
Dynamic Range Calculator
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Single-Point Mean Variance
(Gain) Calculator

Mean Variance Calculator

This single-point Mean Variance calculator will allow you to calculate the actual camera gain your point of measurement. The Mean Variance test is the industry standard for measuring and calculating the gain for every camera setup.

To use:

  1. Enter the average value of your Bias image.
  2. Enter the average values of your 2 image acquisitions.
  3. Subtract one acquisition from the other.
  4. Enter the value of the standard deviation between the pixels of the acquisition difference image.
  5. Click Calculate – This will return the value of the gain at your acquisition settings.