882 Video Test Instrument User Guide (Rev A.35) 59
Using the Image Caching feature
The Image Cache feature enables you to render images quickly. This feature is ideal for
applications, such as production line testing, which require rapid image rendering.
The Image Cache features renders a number of images in advance and stores them in
memory for immediate recall. The number of images that can be stored in cache depends
on the resolution and bit depth of the chosen format. The cached images are stored in
video RAM, and are lost on power cycle, reboot, or issuance of the ICHC command.
Usage of cached images can be divided into two sets of operations. First, the desired
formats and images are loaded in the conventional non-cached manner. As each image is
displayed, it can be saved in the cache to be later recalled in the same format. When all
images have been saved with the proper video formats, they can be quickly recalled from
the cache and displayed.
Use the procedure below to render images quickly with the Image Cache feature.
To test a sink with the Image Caching feature:
1. Load the cache with some images in 2 different formats.
IMGX:SRC Render // specify normal render mode
ICHC // clear the cache
FMTL DMT0660 // select first format
FMTU // use this format
IMGL SmpteBar // load image SmpteBar
IMGU // use this image
ICHA IMG1 // save this image to cache as IMG1 for DMT0660
IMGL Master // load image Master
IMGU // use this image
ICHA IMG2 // save this image to cache as IMG2 for DMT0660
IMGL TVBarH // load image TVBarH
IMGU // use this image
ICHA IMG3 // save this image to cache as IMG3 for DMT0660
FMTL 720p60 // load 720p60 format
FMTU // use this format
IMGL SmpteBar // load image SmpteBar
IMGU // use this image
ICHA IMG4 // save this image to cache as IMG4 for 720p60
IMGL Ramp_B // load image Ramp_B
IMGU // use this image
ICHA IMG5 // save this image to cache as IMG5 for 720p60
IMG:SRC Cache // enable image caching
2. Display these images from cache.
FMTL DMT0660 // load format DMT0660
FMTU // use this format without redrawing
ICHL IMG3 // load cached TVBarH for DMT0660
ICHU // fast display of TVBarH from cache
ICHL IMG1 // load cached SmpteBar for DMT0660
ICHU // fast display of SmpteBar from cache
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