Geometrical Operators
This board can perform cropping and flipping along both directions.
Cropping Operator
The cropping operator extracts a rectangular area of pixels of the reconstructed image delivered by the camera. This area is named "cropped window".
The position and the size of the cropped window can be defined by steps of one pixel in both X and Y directions. However, following limitations are applicable:
- The cropped window must fit entirely within the camera active area.
- The smallest width of the cropped window is 8 columns of pixels.
- The smallest height of the cropped window is 1 row of pixels.
By default, the cropped window is the entire image delivered by the camera.
The main control parameter of the cropping operator is GrabWindow.
By default, this parameter is set to NOBLACK disabling the cropping function. The acquired image fits exactly the active pixels area as defined by the MultiCam camera parameters. No surrounding weak or black pixels are present in the captured image.
To activate the cropping function:
- Set main control parameter GrabWindow to MAN.
- Reduce the size of the image using WindowX_Px and WindowY_Ln. The reduced image remains centered on the camera active pixels area while OffsetX_Px = 0 and OffsetY_Ln = 0.
- Move up/down/left/right the cropping window using OffsetX_Px and OffsetY_Ln. MultiCam limits the scope of the panning to avoid that the cropped window falls outside the camera active area.
The cropping function is not available when TapGeometry = *_2YE.
Notes
- The image cropping reduces the amount of data transfer over to the PCI bus.
- The image cropping does not reduce the workload of the board. The whole image acquired from the camera is processed entirely.
Flipping Operators
The X-flipping operator performs a left/right mirroring of the cropped window.
The Y-flipping operator performs a top/bottom mirroring of the cropped window.
The flipping operators are configured by ImageFlipX and ImageFlipY.
By default, both operators are OFF.