Calculate Readout Noise
The Calculate Readout Noise command measures the readout noise of the camera. The readout noise is the base level of noise produced by the camera system. It is equivalent to the noise in a 0 length exposure. The results are reported in the input units of electrons, or "e-".
The Calculate Readout Noise command opens from the Image Window > Measure > Diagnostics menu when an image set is displayed in the top-most window.
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Calculate Readout Noise Properties |
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Bias 1 |
Select the first Bias frame image from the Image Set. |
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Bias 2 |
Select the second Bias frame image from the Image Set. |
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Check this box to calculate the gain using only the region of interest defined by the Image Cursor Otherwise, the entire image is used. |
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Check this box to enter the calculated readout noise into the image header using the RDNOISE keyword. |
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Click this button to calculate the readout noise. |
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[List Summary] |
Click this button to lists a summary of results in the Main Messages Pane. |
Making this measurement requires opening 2 Bias frames as an Image Set. The image set may have more images but you must select these 2 images from the set.
Open anImage Set containing 2 Bias frames. Make this the top-most window.
Click the Measure > Diagnostics > Calculate Readout Noise command to open the dialog.
Using the 2 image selection controls, select the 2 Bias frames from among the open images.
Using the 
Use Cursor ROI
option, choose whether to use the entire image for making the
measurement or to limit the measurement to a region of "good"
pixels.
Click 
to perform the
calculation.
To view details of the measurements and the calculation, click[List Summary].
The picture below shows typical output in the Message Pane after clicking [List Summary]::
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