Point Grey Flea3 USB 3.0 Technical Reference 5 Video Formats, Modes and Frame Rates
5 Video Formats, Modes and Frame Rates
5.1 Video Modes Overview
The camera implements a number of Format 7 customizable video modes. These modes, which may increase frame
rate and image intensity, operate by selecting a specific region of interest (ROI) of the image, or by configuring the
camera to aggregate pixel values using a process known as “binning.” Some modes implement a combination of ROI
and binning.
On Point Grey cameras, binning refers to the aggregation of pixels. Analog binning is aggregation that occurs before
the analog to digital conversion. Digital binning is aggregation that occurs after the analog to digital conversion. Unless
specified otherwise, color data is maintained in binning modes.
On FL3-U3-32S2 models, no frame rate increase is achieved through binning. A
frame rate increase may be achieved by reducing ROI, depending on Format 7
mode. For more information, see Format 7 Mode Descriptions (page 64).
The figures below illustrate how binning works. 2x vertical binning aggregates two adjacent vertical pixel values to
form a single pixel value. 2x horizontal binning works in the same manner, except two adjacent horizontal pixel values
are aggregated.
Figure 5.1: 2x Vertical and 2x Horizontal Binning
In most cases, pixels are added once they are binned. Additive binning usually results in increased image intensity.
Another method is to average the pixel values after aggregation. Binning plus averaging results in little or no change in
the overall image intensity.
Moving the ROI position to a different location does not require the camera to be stopped (isochronous transmission
disabled) and restarted (iso enabled), unless the change is illegal (e.g. moving the ROI outside the imaging area).
Changing the position or size of the ROI requires approximately one frame time to implement. Changing the Format 7
mode requires up to approximately three frame times to implement.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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