Basic Operation and FeaturesBasler A400k 3-37DRAFT3.12 Test ImagesThe test image mode is used to check the camera’s basic functionality and its ability to transmitan image via the video data cable. The test image can be used for service purposes and for failurediagnostics. In test image mode, the image is generated with a software program and thecamera’s digital devices and does not use the optics, CMOS sensor, or ADCs. Four test imagesare available.3.12.1 Test Image One (Vertical Stripe Pattern)Test image one is useful for determining if your frame grabber has dropped any columns from yourimage.The stripes in the vertical stripe test pattern areformed with a gradient that ranges from 0 to 255(8 bit mode) or 0 to 1023 (10 bit mode). A full stripeis 256 columns (8 bit mode) or 1024 columns (10 bitmode) wide. As an exception, the gray values of thefirst stripe range from 1 to 255 or from 1 to 1023,respectively.The pixels in column one of the first stripe all have avalue of 1. The pixels in column two of the first stripeall have a value of 2, the pixels in column three ofthe first stripe all have a value of 3, and so on. Thispattern continues until column 255 (8 bit mode),where the pixels have a gray value of 255, or column1023 (10 bit mode), where the pixels have a value of1023.In 8 bit mode, a second stripe begins in column 256. The pixels in column 256 have a gray valueof 0, the pixels in column 257 have a value of 1, the pixels in column 258 have a value of 2, andso on. This pattern continues until column 511 where the pixels have a gray value of 255.A third stripe begins in column 512. The pixels in column 512 have a gray value of 0, the pixels incolumn 513 have a value of 1, the pixels in column 514 have a value of 2, and so on. This patterncontinues until column 2352 where the pixels have a value of 48.L NoteDSNU and PRNU shading correction produce distortion in the test image. DisableDSNU and PRNU shading correction before you enable a test image.Figure 3-18: Test Image One (8 bit)
