Specifications

88 Chapter 4: Matrox Solios hardware reference
Video to PCI-X bridge
The video to PCI-X bridge is capable of high-speed transfers to acquisition
memory, to the optional Processing FPGA, and through the PCI-X to
PCI-X/PCIe bridge, to Host memory, off-board display memory, or other devices
across the Host bus. Upon transmitting the video data, the video to PCI-X bridge
can also format the data as follows:
• Image resizing. Captured image data can be cropped (ROI capture) or
subsampled. This can be useful to implement custom software-based motion
detection because at a reduced scale, image comparison is faster.
For all versions of Matrox Solios, the video to PCI-X bridge can arbitrarily
subsample image data to 1/16th of a field or frame.
• Vertical flipping. Captured image data can be flipped vertically.
• Color space conversion. For all versions of Matrox Solios, the color space
converter in the video to PCI-X bridge can convert grabbed image data to YUV
and YCbCr formats. The color space converter can also perform color kill, which
converts the data to grayscale and then converts it to the appropriate destination
format. The equations for the conversion are described in the following table.
Color space conversion Equations
RGB-to-YUV • Y = 0.299 R + 0.587 G + 0.114 B
• U = -0.169 R - 0.331 G +0.500 B + 128
• V = 0.500 R - 0.419 G - 0.081 B +128
RGB-to-YCbCr • Y = 0.257 R + 0.504 G + 0.098 B +16
• Cb = -0.148 R - 0.291 G + 0.439 B +128
• Cr =0.439 R -0.368 G - 0.071 B +128