dB and Read Noise Calculators
The dynamic range of a camera can be expressed in decibels (dB), where the higher the dynamic range, the more gray levels that can be differentiated. However, the gray level values vary due to camera noise which must be taken into consideration when calculating actual dynamic range.
This calculator is designed to calculate the dynamic range when the full well capacity of the camera and read noise values are known. Alternatively, read noise can be calculated if the dynamic range and full well capacity are known.
Pseudo Global Frame Rate Calculator
sCMOS devices feature a “rolling shutter” where the exposure does not begin for the entire sensor at the same time. Instead, exposure and readout move from the top to the bottom of the sensor one line at a time. This architecture is a key reason why sCMOS cameras are significantly faster than (EM)CCD cameras which use a global shutter. A full description of rolling and global shutters can be found in our technical note.
However, there are circumstances where the rolling shutter and the “overlap” of sCMOS camera frames can be an issue. In this case, the “pseudo global” shutter mode should be used to imitate a global shutter.
When using this mode, the camera reads out slower. This calculator is designed to calculate the pseudo global frame rate based on the camera mode used and number of lines in the region of interest.
Note: The result produced by this calculator is theoretical, based on the line time in each mode
and the number of rows. Personal testing is always recommended.
CMOS vs EMCCD Photoelectron Signal Calculator
Comparing the signal level between two cameras can’t be done by simply comparing the gray level intensity because electron to gray level conversion varies greatly between camera modes, bit-depths and technology. For this reason, signal should always be compared in electrons to make sure the comparison is quantitatively accurate.
These calculators are designed to report electron values from gray level values for sCMOS and EMCCD cameras. All that’s needed are the bias/offset and gain values of the cameras being compared. These can be found in the camera Certificate of Performance or requested from the manufacturer. For simplicity, these calculators have been pre-loaded with typical values of some Teledyne Photometrics cameras.
Note: When using the “Select Camera” function, the result produced by these calculators will be based on typical bias/offset and gain values that may not exactly match the camera you have. For the best result, please obtain accurate values.