MultiCam Boards Documentation > GRABLINK series Documentation > GRABLINK DualBase Handbook > Functional Specification > Image Processing > Look-up Table Transformation

Look-up Table Transformation

The look-up table operator enables you to process monochrome or RGB color pixel data streams.

Storage for five LUT definitions is available in the main memory. The LUT of index 0 is built-in and contains a neutral transfer function. The four remaining definitions indexed 1 to 4 are user-definable.

Selecting the LUT of index 0 disables the LUT operator and establishes a bypass in the pixel processing stream.

During MultiCam channel activation, the hardware initializes the LUT operator. Therefore it fills the tables of the LUT operator with the selected LUT definition.

Any further modification of the LUT operator configuration that occurs during the acquisition sequence is applied without any further delay.

Monochrome Operation

When the acquisition channel is configured for acquisition from monochrome cameras, the LUT operator is modeled as a single very high speed RAM inserted into the pixel data stream.

Available configurations and performance of the LUT operator for monochrome cameras

Input bit depth

Output bit depth

Peak pixel rate

8 bits

8 bits

500 megapixels/s

10 bits

8 bits, 10 bits, or 16 bits

250 megapixels/s

12 bits

8 bits, 12 bits, or 16 bits

250 megapixels/s

The input bit depth is the camera bit depth.

The output bit depth is the bit depth of the selected output format.

The peak pixel rate is the maximum rate that the LUT operator can sustain in that configuration. The LUT operator can sustain the pixel rate of the fastest monochrome cameras that can be connected to the board.

RGB Color Acquisition

When the board is configured for acquisition from RGB color cameras, the LUT operator is modeled as a triplet of very high speed RAMs inserted into the red, green, and blue pixel components data streams.

Available configurations and performance of the LUT operator for RGB color cameras

Input bit depth

Output bit depth

Peak pixel rate

3 x 8 bits

3 x 8 bits

125 megapixels/s

The input bit depth is the camera bit depth.

The output bit depth is the bit depth of the selected output format.

The peak pixel rate is the maximum rate that the LUT operator can sustain in that configuration. The LUT operator can sustain the pixel rate of the fastest RGB color cameras that can be connected to the board.

Bayer Color Acquisition

When the board is configured for acquisition from Bayer color cameras, the LUT operator is modeled as a triplet of very high speed RAM inserted into the red, green, and blue pixel components data streams delivered by the CFA decoder.

Available configurations of the LUT operator for Bayer color cameras when the Bayer decoder is enabled

Input bit depth

Output bit depth

Peak pixel rate

8 bits, 10 bits, or 12 bits

3 x 8 bits

125 megapixels/s

The input bit depth is the camera bit depth.

The output bit depth is the bit depth of the selected output format.

The peak pixel rate is the maximum rate that the LUT operator can sustain in that configuration.

Notes