Point Grey Grasshopper - Camera and Device Control

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Point Grey Research Grasshopper Technical Reference

Camera Operations and Features

Revised 26-Nov-10

4.6.8. Embedded Image Information

The Grasshopper has a feature that allows image timing and camera settings information to be

embedded in the first several pixels of each image. This feature is controlled using the

FRAME_INFO register 0x12F8, which is described in detail in the PGR IEEE-1394 Digital

Camera Register Reference.

4.7. Camera and Device Control

4.7.1. Voltage Sensor

The Grasshopper has an on-board sensor that allows the user to monitor a variety of different

voltages, including the current 1394 bus voltage. This feature can be accessed using the

VOLTAGE registers 0x1A50 – 0x1A54, which are described in detail in the PGR IEEE-1394

Digital Camera Register Reference.

4.7.2. Programmable Strobe Output

The Grasshopper is capable of outputting a strobe pulse off one or all of its GPIO pins. By

default, a pin that is configured to be a strobe output will output a pulse each time the camera

begins integration of an image. Setting a strobe duration value of zero will produce a strobe pulse

indicating the exposure (shutter) time.

The Grasshopper can also be configured to output a variable strobe pulse pattern. The strobe

pattern functionality allows users to define the frames for which the camera will output a strobe.

For example, this is useful in situations where a strobe should only fire:

• Every Nth frame (e.g. odd frames from one camera and even frames from another); or

• N frames in a row out of T (e.g. the last 3 frames in a set of 6); or

• Specific frames within a defined period (e.g. frames 1, 5 and 7 in a set of 8)

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