ALU Acquire Options

This submenu provides access to a number of simple operations which acquire images from a video source and manipulate them in real time using the onboard arithmetic logic unit (ALU).

A ALU operations - acquire sequence.

With this option, DigImage allows a sequence of images to be acquired using the ALU, each at a user specified offset time, to frame buffers both onboard and in extended memory.

B ALU operations - acquire single frame.

As with option 'A', the ALU is used during the image acquisition. However, with this option, only one image is acquired and this may be to any buffer. Further, the board may be placed and left in a continuous acquisition mode using the ALU.

M Compute average - sequence of frames.

The ALU is used to produce a weighted average over a specified number of frames for a sequence of buffers. As with option 'A', the sequence is defined by offset times and is placed in the specified buffers. The averaging procedure is add the contents of the buffer with the newly digitized image and divide by two. This is repeated until the desired number of video frames has been processed. If the average is to be performed over M frames, then the weightings for each are given by

           Frame           Weighting
           1               1/(2**(M-1))
           2               1/(2**(M-2))
           ...             ...
           M-1             1/4
           M               1/2

N Compute average - single frame.

Line option 'M' a weighted average is

produced over a specified number of frames. However, with this option only a single buffer is used.

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