CN102611836B - High-speed image collecting method based on Labview - Google Patents

Abstract

The invention relates to a high-speed image collecting method based on Labview, wherein a high-speed camera, an image collecting card and an industrial personal computer are comprised, the high-speed camera and the image collecting card are connected through a specialized image collecting cable, the image collecting card is arranged on the industrial personal computer, an DLL (dynamic link library ) is written for LabVIEW to call by adopting a Sapera++LT function developing package provided by an DALSA, so that the image collecting and real-time control of the high-speed image FA-21-1M120-00-R are achieved. The image collecting by the high-speed camera and the arrangement to parameters of the high-speed camera are achieved through a LabVIEW high-speed image collecting drive program, and the high-speed image collecting method has the advantages of high speed, real time and stability.

Description

A kind of high-speed image sampling method based on Labview

Technical field

The present invention relates to a kind of acquisition technology, particularly a kind of high-speed image sampling method based on Labview.

Background technology

In industrial detection field, electric detective technology has progressively replaced Traditional Man detection method, and wherein image processing techniques development is particularly swift and violent.The high speed of computer, reliability and repeatability are combined and carry out vision-based detection with image processing techniques, there is the features such as automation, noncontact, high accuracy and high speed, can greatly improve detection efficiency.Along with improving constantly that industrial detection requires, the hardware device of image processing techniques also upgrades in constantly upgrading.Image pick-up card adopts PCI-E high speed bus interface, compared to pci bus interface, can significantly promote the speed of image transmitting and collection.Resolution and the frame speed of industry camera also develop and are greatly improved thereupon, and performance index are also more stable, reliable.

LabVIEW is a graphical programming software being provided by American National instrument (National Instruments), its combined with virtual technical device can fast Development test program, possess good industrial detection equipment interface and contain the powerful functional modules such as vision, motion control, embedded development, bus communication, being widely used in industrial measurement and control field.

The high-speed camera head that DALSA company produces FA-21-1M120-00-R model reaches the resolution of 1024*1024, the high-speed image sampling frame speed of 120 frames per second, in vision-based detection, there is good performance, and C++, dotNet function kit are provided, are beneficial to according to testing requirement and carry out secondary development.But there is no the special driven by program interface for LabVIEW, can not directly be applied by LabVIEW, so need the User Exploitation driver of compatibility with it.

Summary of the invention

The present invention be directed to the problem that present high-speed image sampling drives application technology not catch up with, a kind of high-speed image sampling method based on Labview has been proposed, the Sapera++ LT function kit that adopts DALSA company to provide, write DLL dynamic link library and called by LabVIEW, complete the IMAQ of high-speed camera head FA-21-1M120-00-R and control in real time.

Technical scheme of the present invention is: a kind of high-speed image sampling method based on Labview, it is characterized in that, comprise high-speed camera head, image pick-up card and industrial computer, high-speed camera head is connected with image pick-up card by special-purpose IMAQ cable, IMAQ is installed on industrial computer, and industrial computer collection comprises following concrete steps:

1) create structure array allimaq[BUFSIZE], comprising * pBuffer pointer, be used for depositing image address, i_full Boolean type variable is used for judging whether access graph picture, wherein macrodefinition BUFSIZE is for depositing the amount of memory of image, initialization integer variable ai, aj=0, the image access sequence number that wherein ai is call back function, aj is that image deposits internal memory sequence number in;

2) configuration Information Monitoring: comprise connection image pick-up card, the high-speed camera head that selection is connected with image pick-up card, calls outside each acquisition parameter of ccf file configuration high-speed camera head;

3) create image buffer storage space, judge whether to start to gather image;

4) start to gather image, judge allimaq[aj] whether the state of .i_full be true, if so, illustrates that a new two field picture has gathered complete, can transmit operation; Simultaneously allimaq[aj] view data in .pBuff exports, and makes allimaq[aj] .i_full is false, and aj++; Otherwise, illustrate that new image does not also collect;

5), when stopping taking, discharge configuration image capture card, high-speed camera head and the memory headroom of the image array that creates;

6), while taking a two field picture, program can proceed in call back function automatically, carries out the storage operation of image, comprises the steps: at every turn

A: the image collecting is put into image buffer storage;

B: the image of storing in image buffer storage, is passed to allimaq[ai] in .pBuff;

C: remove and release image buffer storage;

D：ai++；

7) after step 6) finishes, translate and generate DLL dynamic link library, comprise initialization function (DALSA_Init), start to take function (DALSA_Start), gather image function (DALSA_Snap), stop taking function (DALSA_Stop), the Call Library Function Node of use LabVIEW calls the function of above-mentioned DLL dynamic link library, complete the IMAQ of high-speed camera head and control, concrete steps comprise as follows:

I) call DALSA_Init function, initialization high-speed camera head, image pick-up card, create one dimension image array, and array length is 1048576, creates image buffer storage;

II) call DALSA_Start function, start to enter shooting state;

III) call DALSA_Snap and gather image function, the one dimension image array of output is converted to two dimensional image array, two dimensional image array size after changing is 1024*1024, and the IMAQ ArrayToImage.vi of the Vision module by LabVIEW shows two dimensional image array with image format;

IV) call DALSA_Stop function, stop taking, cleaning discharges shared memory headroom.

Beneficial effect of the present invention is: the high-speed image sampling method that the present invention is based on Labview, by this high-speed image sampling of LabVIEW driver, complete high-speed camera head to the collection of image and the setting to each parameter of high-speed camera head, there is high speed, real-time, stable.

Accompanying drawing explanation

Fig. 1 is the hardware block diagram that the present invention is based on the high-speed image sampling method high speed IMAQ driver of Labview;

Fig. 2 is the software flow pattern that the present invention is based on DLL dynamic link library in the high-speed image sampling method of Labview;

Fig. 3 the present invention is based in the high-speed image sampling method of Labview the software flow pattern of call back function in DLL dynamic link library;

Fig. 4 the present invention is based on the software flow pattern that LabVIEW in the high-speed image sampling method of Labview calls DLL Dynamic Link Library Function.

Embodiment

High-speed camera head, the image pick-up card that DALSA company provides and the C++ function kit Sapera++ LT providing are provided in the present invention, and compiling generates DLL dynamic link library, and by upper strata, LabVIEW calls, and realizes collection and the control of high-speed camera head.

Hardware block diagram as shown in Figure 1, it comprises high-speed camera head, image pick-up card and industrial computer, described high-speed camera head model is FA-21-1M120-00-R, connects described image pick-up card.Described image pick-up card model is x64-Xcelera-CL LX1, and compatible with described high-speed camera head, by special-purpose IMAQ cable, connects.Described industrial computer is provided with described image pick-up card, completes program control.

The software flow pattern of DLL dynamic link library as shown in Figure 2, concrete operating procedure is as follows:

1) create structure array allimaq[BUFSIZE], comprising * pBuffer pointer, be used for depositing image address, i_full Boolean type variable is used for judging whether access graph picture, wherein macrodefinition BUFSIZE is for depositing the amount of memory of image, initialization integer variable ai, aj=0, the image access sequence number that wherein ai is call back function, aj is that image deposits internal memory sequence number in;

2) configuration Information Monitoring: comprise connection image pick-up card, the high-speed camera head that selection is connected with image pick-up card, calls outside each acquisition parameter of ccf file configuration high-speed camera head;

3) create image buffer storage space, judge whether to start to gather image;

4) start to gather image, judge allimaq[aj] whether the state of .i_full be true, if so, illustrates that a new two field picture has gathered complete, can transmit operation; Simultaneously allimaq[aj] view data in .pBuff exports, and makes allimaq[aj] .i_full is false, and aj++; Otherwise, illustrate that new image does not also collect;

5), when stopping taking, discharge configuration image capture card, high-speed camera head and the memory headroom of the image array that creates.

Wherein mainly comprise: initialization function (DALSA_Init), start to take function (DALSA_Start), gather image function (DALSA_Snap), stop taking function (DALSA_Stop).Core code is as follows:

Void Dalsa_Init (char* path_name) // initialization function

{……

For (i=0; I<FRAMESIZE; I++) // initialization structure array

{

allimaq[i].pBuffer=?new?BYTE[1024*1024];

allimaq[i].i_full=false;

}

……

Acq->Create (); // distribution image capture device underlying resource

Buffers->Create (); // establishment IMAQ spatial cache

Xfer->Create (); // establishment image transmitting passage

……}

Void Dalsa_Start (void) // start to take function

{

Xfer->Grab (); // collection image

}

Void Dalsa_Snap (BYTE* disimage) // collection image function

{……

for?(i=0;i<1024;i++)

for(j=0;j<1024;j++)

{

Disimage[i*1024+j]=allimaq[aj] .pBuffer[i*1024+j] // collection image

}

……}

Void Dalsa_Stop (void) // stop taking function

{……

Xfer->Destroy (); // release transmission channel

Buffers->Destroy (); // release graphics is as spatial cache

Acq->Destroy (); // release image capture device memory headroom

Delete[] arrbuf; // remove release graphics as array

For (i=0; I<BUFSIZE; I++) // removing releasing structure body array

{

delete[]?allimaq[i].pBuffer;

}

……}

The software flow pattern of call back function as shown in Figure 3, concrete operating procedure is as follows:

1) image collecting is put into image buffer storage;

2) image of storing in image buffer storage, is passed to allimaq[ai] in .pBuff;

3) remove and discharge image buffer storage;

4）ai++。

Main core code is as follows:

Static void myCallback (SapXferCallbackInfo * pInfo) // call back function

{……

Buffers->GetAddress (ai, 0,1024*1024, (void**) & imaqbuf); // image is put into buffer memory

Memcpy (allimaq[ai] .pBuff, imaqbuf, 1024*1024); // image in buffer memory is derived

Buffers->ReleaseAddress ((void*) imaqbuf); // release buffer memory

allimaq[ai].i_full=true;

ai++;

if(ai==BUFSIZE)?{ai=0;}

……}

LabVIEW calls the software code of DLL Dynamic Link Library Function as shown in Figure 4, and concrete operating procedure is as follows:

1) call DALSA_Init function, initialization high-speed camera head, image pick-up card, create one dimension image array, and array length is 1048576, and creates image buffer storage;

2) call DALSA_Start function, start to enter shooting state;

3) call DALSA_Snap and gather image function, the one dimension image array of output is converted to two dimensional image array, two dimensional image array size after changing is 1024*1024, and the IMAQ ArrayToImage.vi of the Vision module by LabVIEW shows two dimensional image array with image format;

4) call DALSA_Stop function, stop taking, cleaning discharges shared all memory headrooms.

Claims (1)

1. the high-speed image sampling method based on Labview, is characterized in that, high-speed camera head is connected with image pick-up card by special-purpose IMAQ cable, and IMAQ is installed on industrial computer, and industrial computer collection comprises following concrete steps:

1) create structure array allimaq[BUFSIZE], comprising * pBuffer pointer, be used for depositing image address, i_full Boolean type variable is used for judging whether access graph picture, wherein macrodefinition BUFSIZE is for depositing the amount of memory of image, initialization integer variable ai, aj=0, the image access sequence number that wherein ai is call back function, aj is that image deposits internal memory sequence number in;

2) configuration Information Monitoring: comprise connection image pick-up card, the high-speed camera head that selection is connected with image pick-up card, calls outside each acquisition parameter of ccf file configuration high-speed camera head;

3) create image buffer storage space, judge whether to start to gather image;

4) start to gather image, judge allimaq[aj] whether the state of .i_full be true, if, illustrate that a new two field picture has gathered complete, can transmit operation, simultaneously allimaq[aj] view data in .pBuffer exports, and makes allimaq[aj] .i_full is false, and aj++; Otherwise, illustrate that new image does not also collect;

5), when stopping taking, discharge configuration image capture card, high-speed camera head and the memory headroom of the image array that creates;

6), while taking a two field picture, program can proceed in call back function automatically, carries out the storage operation of image, comprises the steps: at every turn

A: the image collecting is put into image buffer storage;

B: the image of storing in image buffer storage, is passed to allimaq[ai] in .pBuffer;

C: remove and release image buffer storage;

D：ai++；

7) after step 6) finishes, compiling generates DLL dynamic link library, comprise initialization function (DALSA_Init), start to take function (DALSA_Start), gather image function (DALSA_Snap), stop taking function (DALSA_Stop), the Call Library Function Node of use LabVIEW calls the function of above-mentioned DLL dynamic link library, complete the IMAQ of high-speed camera head and control, concrete steps comprise as follows:

I) call DALSA_Init function, initialization high-speed camera head, image pick-up card, create one dimension image array, and array length is 1048576, creates image buffer storage;

II) call DALSA_Start function, start to enter shooting state;

III) call DALSA_Snap and gather image function, the one dimension image array of output is converted to two dimensional image array, two dimensional image array size after changing is 1024*1024, and the IMAQ ArrayToImage.vi of the Vision module by LabVIEW shows two dimensional image array with image format;

IV) call DALSA_Stop function, stop taking, cleaning discharges shared memory headroom.

Images