Video Modes Overview - FLIR GRASSHOPPER 3 Series Technical Reference

8.2

Video Modes Overview

The camera implements a number of video modes, all of which allow the user to select a specific region of interest
(ROI) of the image. Some modes also aggregate pixel values using a process known as "binning". Specifying an
ROI may increase frame rate. Modes that perform binning may increase image intensity.
On FLIR machine vision 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.
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.
Subsampling, or decimation, refers to the skipping of pixels.
Binning and subsampling reduces the effective image resolution. For example, 2x2 binning reduces both the width
and the height by a quarter.
The figures below illustrate binning and subsampling. 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. 2x2 subsampling skips every second pixel horizontally and vertically.
Full Pixels
Moving the ROI position to a different location does not require the camera to be stopped and restarted, unless the
change is illegal (e.g. moving the ROI outside the imaging area).
2/10/2017
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2x Vertical Binning
Figure 8.1: Aggregation and Decimation of Pixels
Note: Pixel correction is not done in any of the binning modes
Grasshopper
8 Grasshopper3 PGE Attributes
2x Horizontal Binning
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3 PGE Technical Reference
2x2 Subsampling
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