Teledyne Princeton Instruments NIRvana HS, System Manual

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60 NIRvana HS System Manual Issue 1.0
8.2.2 Single Region of Interest Placement Guidelines
For imaging applications, when positioning/placing a single Region of Interest the
greatest improvement in Readout Time/Frame Rate is achieved when the ROI is
positioned such that, referencing a standard (x, y) coordinate system, its corners are
placed such that:
• The x-coordinates are multiples of 16;
For example, 0, 16, 32, 48, …
• The y-coordinates are multiples of 4.
For example, 0, 4, 8, 12, …
For spectrographic applications, by default the full width of the sensor is required.
Therefore, when positioning/placing a single Region of Interest the greatest
improvement in Readout Time/Frame Rate is achieved when the full-width ROI is
positioned such that its top and bottom boundaries fall on rows that are multiples of 4
(i.e., 0, 4, 8, 12, …)
8.2.3 Two to Four Regions of Interest Placement Guidelines
When positioning two to four ROIs on a sensor, in addition to the guidelines detailed in
Section 8.2.2, Single Region of Interest Placement Guidelines , there are additional
placement guidelines which should be followed in order to achieve the maximum
benefit in Readout Times/Frame Rate improvements.
For imaging applications:
• Regions of Interest should not share rows;
• Adjacent edges of vertically stacked ROIs must be separated by a multiple of 4
rows.
For spectroscopic applications:
8.2.4 Regions of Interest Impact on Frame Rate
This section compares experimentally obtained Frame Rates for a series of imaging
application Regions of Interest geometries.
Unless otherwise or explicitly stated:
• The entire sensor area is included for relative positioning of Regions of Interest;
• Each geometry is comprised of two (2) Regions of Interest;
• Each Region of Interest measures 200 x 200 pixels;
• Each Region of Interest has been color-coded for ease of identification only;
• Where applicable, identified gaps between Regions of Interest are expressed in
Rows or Columns (as appropriate.)
As a point of reference, the base frame rate (i.e., when no Regions of Interest have been
defined,) is 32.3 fps using a clock speed of 3.125 MHz.