Using The Image Caching Feature - Quantum Data 881 User Manual

Using the Image Caching feature

882 Video Test Instrument User Guide (Rev A.35)
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
ICHC
FMTL DMT0660
FMTU
IMGL SmpteBar
IMGU
ICHA IMG1
IMGL Master
IMGU
ICHA IMG2
IMGL TVBarH
IMGU
ICHA IMG3
FMTL 720p60
FMTU
IMGL SmpteBar
IMGU
ICHA IMG4
IMGL Ramp_B
IMGU
ICHA IMG5
IMG:SRC Cache
2. Display these images from cache.
FMTL DMT0660
FMTU
ICHL IMG3
ICHU
ICHL IMG1
ICHU
// specify normal render mode
// clear the cache
// select first format
// use this format
// load image SmpteBar
// use this image
// save this image to cache as IMG1 for DMT0660
// load image Master
// use this image
// save this image to cache as IMG2 for DMT0660
// load image TVBarH
// use this image
// save this image to cache as IMG3 for DMT0660
// load 720p60 format
// use this format
// load image SmpteBar
// use this image
// save this image to cache as IMG4 for 720p60
// load image Ramp_B
// use this image
// save this image to cache as IMG5 for 720p60
// enable image caching
// load format DMT0660
// use this format without redrawing
// load cached TVBarH for DMT0660
// fast display of TVBarH from cache
// load cached SmpteBar for DMT0660
// fast display of SmpteBar from cache
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