4 Functionality
4.13
Double Rate (DR1-D1312(IE) only)
The Photonfocus DR1 cameras use a proprietary modulation algorithm to cut the data rate by
almost a factor of two. This enables the transmission of high frame rates over just one Gigabit
Ethernet connection, avoiding the complexity and stability issues of Ethernet link aggregation.
The algorithm is lossy but no image artefacts are introduced, unlike for example the JPEG
compression. It is therefore very well suited for most machine vision applications except for
measuring tasks where sub-pixel precision is required.
Double rate modulation can be turned off for debugging purposes.
The modulated image is transmitted in mono 8 bit data resolution.
The modulation is run in real-time in the camera’s FPGA. A DLL for the demodulation of the
image for SDK applications is included in the GEV-Player software package that can be
downloaded from Photonfocus (see also 6).
The modulation factor is independent of the image content. The modulated image has the
same number of rows as the unmodulated image. The required image width (number of bytes
in a row) for the modulated image can be calculated as follows (value can also be read from a
camera property), see also Table 4.21:
w
mod
= ceil(w/64) + w/2 + 2
92
Summary of Contents for DR1-D1312(IE)-G2
Page 2: ......
Page 4: ...2...
Page 8: ...CONTENTS 6...
Page 14: ...2 How to get started GigE G2 Figure 2 3 PFInstaller components choice 12...
Page 96: ...4 Functionality 94...
Page 122: ...6 Software 120...
Page 128: ...8 Warranty 126...
Page 130: ...9 References 128...