804 Series Video Test Generator
– User Guide
Page 33
Revision B3
3. (If applicable) Specify the test pattern options. Refer to the section
List of Test Patterns
for a description of each option.
7.4
Using Image Caching to render bitmaps quickly
The Image Cache feature enables you to render bitmap images quickly. This feature is ideal for production lines in
manufacturing.
The Image Cache feature is configured using the command line interface. Once configured the 804/804A/804B renders
bitmap 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.
Use the procedure below to render bitmap images quickly with the Image Cache feature.
1. Load the desired bitmaps into the 804/804A/804B using the procedures in the section
Workflow for Importing Bitmaps
.
2. Create the userpats.txt file which maps the bitmap images to aliases. Use the example below:
The structure of the UserPats file is:
<bmpname.bmp> space <description>
The contents of the UserPats.txt text file would be:
720Img1.bmp Master 1280x720 -
(this maps to alias “User00”)
720Img2.bmp Master 1280x720 -
(this maps to alias “User01”)
720Img3.bmp Master 1280x720 -
(this maps to alias “User02”)
1080Img1.bmp Master 1920x1080 - (this map
s to alias “User03”)
1080Img2.bmp Master 1920x1080 -
(this maps to alias “User04”)
1080Img3.bmp Master 1920x1080 -
(this maps to alias “User05”)
Note 1
: The bitmap name has to match the name of the stored bitmap.
Note 2
: The bitmap name uses the 8.3 character structure.
Note 3
: The description is limited to 20 characters.
3. Establish a command line session to the 804/804A/804B using the procedures in the section
Establishing an RS-232
connection to the /804B
.
4. Create and load the bitmap images in cache. The example below illustrates how to load formats and cached images.
ICHC // clears the cache
FMTL 720p60 // loads the 720p60 format
FMTU // applies the format
IMGL User00 // loads the first bitmap image stored in the userpats.txt file
IMGU // applies the image
ICHS // save the bitmap into cache
IMGL User02 // loads the third bitmap image stored in the userpats.txt file
IMGU // applies the image
ICHS // save the bitmap into cache
FMTL 1080p60 // loads the 1080p60 format
FMTU // applies the format
IMGL User03 // loads the fourth bitmap image stored in the userpats.txt file
IMGU // applies the image
ICHS // save the bitmap into cache
IMGL User05 // loads the sixth bitmap image stored in the userpats.txt file