Blackfly - CYLOD

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Point Grey Blackfly Technical Reference 8 Blackfly Attributes Access this feature using: GenICam Image Format Control 8.15 Embedded Image Information This setting controls the frame-specific information that is embedded into the first several pixels of the image. The first byte of embedded image data starts at pixel 0,0 (column 0, row 0) and continues in the first row of the image data: (1, 0), (2,0), and so forth. Users using color cameras that perform Bayer color processing on the computer must extract the value from the non-color processed image in order for the data to be valid. Embedded image values are those in effect at the end of shutter integration. Each piece of information takes up 32-bits (4 bytes) of the image. When the camera is using an 8- bit pixel format , this is 4 pixels worth of data. The following frame-specific information can be provided: • Timestamp • Gain • Exposure • Brightness • White Balance • Frame counter • Strobe Pattern counter • GPIO pin state • ROI position If you turned on all possible options the first 40 bytes of image data would contain camera information in the following format, when accessed using the FlyCapture 2 API: (assuming unsigned char* data = rawImage.GetData(); and an Image object rawImage): • data[0] = first byte of Timestamp data • data[4] = first byte of Gain data • data[24] = first byte of Frame Counter data If only Exposure embedding were enabled, then the first 4 bytes of the image would contain Exposure information for that image. Similarly, if only Brightness embedding were enabled, the first 4 bytes would contain Brightness information. For black and white cameras, white balance is still included, but no valid data is provided. Access this feature using: CSR FRAME_INFO: 12F8h Revised 12/13/2012 Copyright ©2012 Point Grey Research Inc. 56
Point Grey Blackfly Technical Reference 8 Blackfly Attributes Interpreting Timestamp information The Timestamp format is as follows (some cameras replace the bottom 4 bits of the cycle offset with a 4-bit version of the Frame Counter): Cycle_offset increments from 0 to 3071, which equals one cycle_count. Cycle_count increments from 0 to 7999, which equals one second. Second_count increments from 0 to 127. All counters reset to 0 at the end of each cycle. Interpreting ROI information The first two bytes are the distance from the left frame border that the region of interest (ROI) is shifted. The next two bytes are the distance from the top frame border that the ROI is shifted. Revised 12/13/2012 Copyright ©2012 Point Grey Research Inc. 57
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Blackfly - CYLOD

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