buffer nodes When the number of obtained images is (Page 24 / 599) Machine Vision Camera SDK (DotNet)

Machine Vision Camera SDK (DotNet) Developer Guide

buffer nodes. When the number of obtained images is larger than this number, the earliest

image data will be discarded automatically.

• For original image data, you can call

MvCamCtrl.NET::MyCamera::MV_CC_ConvertPixelType_NET to convert the image pixel

format, or you can call MvCamCtrl.NET::MyCamera::MV_CC_SaveImageEx2 to convert the

image to JPEG or BMP format and save as a file.

6. Perform one of the following operations to acquire images.

- Call MvCamCtrl.NET::MyCamera::MV_CC_GetOneFrameTimeout_NET repeatedly in the

application layer to get the frame data with specified pixel format.

- Call MvCamCtrl.NET::MyCamera::MV_CC_GetImageBuffer_NET in the application layer to

get the frame data with specified pixel format and call

MvCamCtrl.NET::MyCamera::MV_CC_FreeImageBuffer_NET to release the buffer.

Note

• When getting the frame data, the application program should control the frequency of calling

this API according to the frame rate.

• The differences of above two image acquisition methods are:

MvCamCtrl.NET::MyCamera::MV_CC_GetImageBuffer_NET should be used with

MvCamCtrl.NET::MyCamera::MV_CC_FreeImageBuffer_NET in pairs, the data pointer of

pstFrame should be released by

MvCamCtrl.NET::MyCamera::MV_CC_FreeImageBuffer_NET .

Compared with MvCamCtrl.NET::MyCamera::MV_CC_GetOneFrameTimeout_NET ,

MvCamCtrl.NET::MyCamera::MV_CC_GetImageBuffer_NET is more efficient, and its stream

buffer is allocated by SDK, while the stream buffer of

MvCamCtrl.NET::MyCamera::MV_CC_GetOneFrameTimeout_NET should allocated by the

developer.

• The above two methods and the method of acquiring image in callback function cannot be

used at the same time.

• The pData returns an address pointer, it is recommended to copy the data of pData to create

another thread.

7. Acquire images.

1) Call MvCamCtrl.NET::MyCamera::MV_CC_GetOneFrameTimeout_NET repeatedly in the

application layer to get the frame data with specified pixel format.

Note

When getting the frame data, the application program should control the frequency of calling

this API according to the frame rate.

8. Optional: Call MvCamCtrl.NET::MyCamera::MV_CC_DisplayOneFrame_NET to input the

window handle and start displaying.

9. Call MvCamCtrl.NET::MyCamera::MV_CC_StopGrabbing_NET to stop the acquisition or stop

displaying.

10. Call MvCamCtrl.NET::MyCamera::MV_CC_CloseDevice_NET to close the device.