Andor Technology iXon Ultra 897 User Manual page 77

SETTING THE AQUISITION
To read out data from a selected area, or Sub Image, of the EMCCD use the radio
buttons to select the resolution, which you require. The software offers a choice of
up to four defined sub images, depending on the format of your iXon CCD camera.
These pre-defined sub images are located in the centre of the chip, but can be
moved by clicking and dragging the Sub Image outline.
There is also an option for you to define a Custom Sub Image. This function
allows you to set the Sub Image to any size and location on the CCD chip. To
define a Custom Sub Image use the co-ordinate entry Dialog boxes to select the
size and location of your sub image.
In addition to the above methods of defining a Sub Image on the CCD, you can
Draw
also use the Draw Option to select the size and location of your Sub Image. In
order to use the Draw Option, you must first acquire a full resolution image. This
will be the template on which you will draw your Sub Image. Use the Draw tool
to select the size and position of your Sub Image. Alternatively, a Sub Image
can be drawn on the template by positioning your cursor on the image, and
dragging out the shape of the Sub Image area you require.
The image that is displayed in the Binning Dialog Box is the last image acquired. Region of Interest
If a Region on Interest, or ROI, has been selected it will appear on this image, and
you can use your mouse to change the location or size of the ROI. For more detail
on using the ROI function see SECTION 4 – REGION OF INTEREST.
As well as selecting a Sub Image of the CCD, you can also use a system of pixel Superpixels
charge aggregation, known as Binning, to create superpixels. Superpixels consist
of two or more individual pixels that are binned and read out as one large pixel: the
CCD, or your selected sub-area, becomes a matrix of superpixels.
The horizontal and vertical Binning parameters determine the dimensions of any Binning
superpixels you may choose to create.
Section 4 . 5
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