Micron Technology USB Camera - Manual (Page 32)

Sensor Control: Decimation
28 SMX-M8xx Series USB2.0 Camera User Guide
Decimation
Use the Decimation control to decimate (sub-sample) the picture by 2, 4, etc. The
decimation means excluding pixels and rows from the scan process (e.g. every second
pixel and second row for the 1:2 decimation). This mode thus allows viewing the full
picture at the higher Frame Rate (
see chapter “Frame Rate Control” ). The decimation can
be used for preview, when the full 1600x1200 image displayed as 800x600 with the
frame rate twice higher. Use its dropdown menu to change Decimation.
Viewport Settings
Viewport is a rectangular area of the sensor on which the image is scanned. It can have
variable size, from the smallest area of 8x8 pixels to the full field of view of the sensor.
The smaller the size of the Viewport, the faster the scan process, and the higher Frame
Rate (
see chapter “Frame Rate Control” ). To open the Viewport Settings dialog ( see Figure
4-1 Viewport Setting dialog: the case of the SMX-M82C Camera ), press Alt+V or click the
corresponding button on the toolbar:
Figure 4-1 Viewport Setting dialog: the case of the SMX-M82C Camera
The blue rectangle represents the current viewport window related to the full possible
field of view. Drag the rectangle across the full resolution area for the viewport panning.
The changes are displayed in the View window immediately.
Use the boxes in the bottom part to set the viewport offset and size manually and click
the Apply button to apply the settings. The values should be divisible by 8 and will be
rounded and applied automatically within 2 seconds after last keystroke.