HALCON 7.1 Frame Grabber Interface for Daheng USB 2.0 Cameras
This page provides the documentation of the HALCON DahengCAM interface for USB 2.0 cameras from Daheng Group. Registered customers can download the latest revision of this interface from the MVTec WWW server.
Revision: 2.1
System Requirements
- Intel compatible PC with Windows 2000/XP and USB 2.0 interface.
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DahengCAM driver <camera name>.sys, e.g. HV3103UC.sys.
Typically, this file resides in the directory %WINDIR\system32\drivers. If you do not have this driver, please contact Daheng Group or the vendor from which you bought the camera. -
Needed DLL files: Raw2Rgb.dll, HVDailt.dll, HVUtil.dll.
These files must be within your search path %PATH% (typically, it resides in the directory %WINDIR%\system32). If you do not have these DLLs, please contact Daheng Group or the vendor from which you bought the camera. -
HALCON frame grabber interface HFGDahengCAM.dll or
parHFGDahengCAM.dll, respectively.
If you have properly installed the interface, both DLLs should reside in bin\i586-nt4 within the HALCON base directory %HALCONROOT% you have chosen during the installation of HALCON.
Features
- Multiple cameras.
- Synchronous and asynchronous grabbing.
- External trigger.
- Software control of gain, shutter, and white balancing.
Limitations
- grab_region and grab_region_async not supported.
- No LUTs.
Using Multiple Cameras
When using multiple Daheng USB 2.0 cameras each camera has an unique ID number starting with '1'.
Using Asynchronous Grabbing
Daheng USB 2.0 cameras differ only between continuous grabbing and triggered grabbing. Thus, when calling grab_image_async in continuous mode you will always get the newest available image.
Description
Parameters for open_framegrabber():
| Name | 'DahengCAM' | The name of the HALCON frame grabber interface. | |||
| HorizontalResolution | --- | Ignored. | |||
| VerticalResolution | --- | Ignored. | |||
| ImageWidth | width | The width of the desired image part ('0' stands for the complete image). Default: 0. | |||
| ImageHeight | height | The height of the desired image part ('0' stands for the complete image). Default: 0. | |||
| StartRow | row | The row coordinate of the upper left pixel within the desired image part. Default: 0. | |||
| StartColumn | column | The column coordinate of the upper left pixel within the desired image part. Default: 0. | |||
| Field | --- | Ignored. | |||
| BitsPerChannel | --- | Ignored. | |||
| ColorSpace | 'default', 'gray', 'rgb' | Specify the desired color space and thus the number of image channels of the resulting HALCON image. Default: 'gray'. | |||
| Gain | gain | Set the value of the camera gain. Default: 10.0. | |||
| ExternalTrigger | 'true', 'false' | Activate/deactivate external triggering. Default: 'false'. | |||
| CameraType | 'HV-13xx', 'HV-20xx', 'HV-30xx', 'HV-31xx', 'SV-13xx' | The type of the connected camera series. Default: 'HV-13xx'. | |||
| Device | '1', '2', '3', ... | The ID of the camera. If you have two cameras connected the first one has device ID '1', the second has device ID '2'. Default: '1'. | |||
| Port | --- | Ignored. | |||
| LineIn | --- | Ignored. | |||
Parameters for set_framegrabber_param():
| 'adc_level' | 'adc0', 'adc1', 'adc2', 'adc3' |
Sets the level of the A/D translation:
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| 'bayer_convert_type' | 'low', 'normal', 'high' | Sets one of the possible convertion types. Default: 'low'. | |||
| 'bayer_layout' | 'bayer_gb', 'bayer_gr', 'bayer_bg', 'bayer_rg' | Sets the associated bayer mode to the camera. In case of using a SV-13xx camera default is 'bayer_rg', else 'bayer_gr'. | |||
| 'dh_lut_table' | file name | Sets the LUT table via reading the information from the specified file. The option is only successful with "SV-13xx" series cameras. | |||
| 'gain' | 0 ... 127 (long) | Specifies the gain value of the camera. | |||
| 'grab_timeout' | 100 ... 327680 (long) | Specifies the desired timeout (milliseconds passed as an integer) for aborting a pending grab. Default: 5000. | |||
| 'image_height' | height (long) | Sets the height of the image. | |||
| 'image_width' | width (long) | Sets the width of the image. | |||
| 'resolution' | 'mode0', 'mode1', 'mode2', 'mode3' | Specifies the resolution of the image depending of the camera model. Mode0 always is the maximum resolution of the camera. Default: 'mode0'. | |||
| 'shutter' | 0 ... 16383 (long) | Sets the shutter (exposure time) of the camera. | |||
| 'shutter_unit' | 'us', 'ms', 's' | Sets the unit of the shutter. Default: 'ms'. | |||
| 'snap_mode' | 'continuous', 'trigger', 'trigger_edge', 'trigger_level' | Sets the snap mode of the camera. If set to 'trigger' an external trigger signal is needed to grab an image. In continuous mode the camera grabs images continuously. Default: 'continuous'. | |||
| 'snap_speed' | 'normal', 'high' | Sets the snap speed modus. Default: 'high'. | |||
| 'start_column' | column (long) | Sets the start column of the image. Default: 0. | |||
| 'start_row' | row (long) | Sets the start row of the image. Default: 0. | |||
| 'trigger_signal' | 'high_active', 'low_active' | Specifies the desired type of the trigger signal. Default: 'high_active'. | |||
| 'white_balance' | 'enable', 'disable' | Enables or disables the white balance mode. Default: 'disable'. | |||
| 'white_balance_b' | white_balance_b (float) | Sets the white balance for the blue channel. | |||
| 'white_balance_g' | white_balance_g (float) | Sets the white balance for the green channel. | |||
| 'white_balance_r' | white_balance_r (float) | Sets the white balance for the red channel. | |||
Parameters for get_framegrabber_param():
Additional parameters supported by get_framegrabber_param only. Note that all parameters supported by set_framegrabber_param can also be accessed by get_framegrabber_param.
| 'revision' | revision | The revision number of the HALCON DahengCAM interface. | |||
Release Notes
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Revision 2.1 (Apr 26, 2007):
- Added support of SV-13xx camera series.
- Bugfix using multible cameras.
- Added parameters 'bayer_convert_type', 'bayer_layout', 'dh_lut_table', 'image_height', 'image_width', 'shutter_unit', 'snap_speed', 'start_col', and 'start_row'.
- Added 'trigger_edge' and 'trigger_level' to parameter 'snap_mode'.
- Changed camera type names.
- Changed type of gain parameter from float to long (float still supported).
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Revision 2.0 (Jul 28, 2006):
- First official release.
