Sigma LBA-400 Manuel D’Utilisation

4.4.1.2  Digital Camera Zooming 

Digital camera zoom image sizing does not follow the same powers-of-two rule that is shown 

above for analog cameras.  For digital cameras both the Full 1x and the 1x resolutions are the 
same size, and that size is set to the maximum imager dimensions that the Spiricon frame 

grabber can reliably capture.  This can vary from camera to camera based upon the pixel clock 

rate and other image framing characteristics unique to each camera design.   
Hardware zooming steps involve dividing the horizontal and vertical pixel counts by 2 and then 

rounding to the next even value when the results come out odd.  This rule applies whenever the 

resolution is set to either Full 1x or 1x.  If the zooming begins at a resolution less than 1x, say 
4x, zooming steps will first cause the resolution to increase from 4x to 2x to 1x, whereupon the 

first rule of dividing by 2 will then take over. 

  

Soft Zooming, unlike the above Hardware Zoom, does not affect your data acquisition frame size 

or resolution.  Soft Zooming only impacts the magnification of the displayed image.  To initiate a 

Soft Zoom, Double-right-click inside the Dark Gray box.  Observe that a smaller Light Gray box 
now appears, and that your beam display image has been magnified.  You can continue to Soft Zoom-

in by Double-right-clicking until your image is magnified to 16x15 pixels.  To Soft Zoom-out, Double-

right-click outside of the Light Gray box.  Each soft zoom increases or decreases the image 

magnification by a factor of 2x. 
The center of the Soft Zooming action will be the intersection point of the Cursors.  If the Cursors are 

turned Off, the zoom center will be about the center of the current frame. 

 
Note:  You can not perform Hardware Zoom operations once you have caused a Soft Zoom to occur.  To change the 
Hardware Zoom you must first zoom all the way out of the soft zoom, until the Light Gray box is no longer visible. 
 

You can Pan the Dark Gray capture window across the camera’s active detector region.  Panning 

works at all zoom and resolution settings that do not already contain the entire digitizable area of the 

camera’s imager.  If Soft zooming is activated, then the Panning controls will only pan the Light Gray 

zoom box. 
Two scroll bars are provided to allow you to perform the panning operations.  The Horizontal scroll 

bar will allow you to pan Left and Right; the Vertical allows you to pan Up and Down. 
 

 

Operator’s Manual 

 

LBA-PC 

 

Doc. No. 10654-001, Rev 4.10 

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