int CVICALLBACK Thresholding (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
int threshold = 0;
int histogram[256] = {0};
HistogramReport *report = NULL;
switch (event)
{
case EVENT_COMMIT:
GetCtrlVal (mypanel, MYPANEL_THRESHOLD_SLIDE, &threshold);
imaqThreshold (destimage, sourimage, threshold, 255, TRUE, 255);
imaqSetWindowTitle (1, "Picture after binaryzation");
imaqMoveWindow (1, imaqMakePoint (150, 260));
imaqDisplayImage (destimage, 1, TRUE);
report = imaqHistogram (destimage, 256, 0, 255, IMAQ_IMAGE_U8);
DeleteGraphPlot (mypanel, MYPANEL_MYGRAPH, -1, VAL_IMMEDIATE_DRAW);
PlotY (mypanel, MYPANEL_MYGRAPH, (*report).histogram, 256, VAL_UNSIGNED_INTEGER,
VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);
break;
}
return 0;
}
HistogramReport* frcHistogram(const Image* image, int numClasses, float min, float max, Rect rect)
{
int success;
int fillValue = 1;
/* create the region of interest */
ROI* pRoi = imaqCreateROI();
success = imaqAddRectContour(pRoi, rect);
if ( !success ) { GetLastVisionError(); return NULL; }
/* make a mask from the ROI */
Image* pMask = frcCreateImage(IMAQ_IMAGE_U8);
success = imaqROIToMask(pMask, pRoi, fillValue, NULL, NULL);
if ( !success ) {
GetLastVisionError();
frcDispose(__FUNCTION__, pRoi, NULL);
return NULL;
}
/* get a histogram report */
HistogramReport* pHr = NULL;
pHr = imaqHistogram(image, numClasses, min, max, pMask);
/* clean up */
frcDispose(__FUNCTION__, pRoi, pMask, NULL);
return pHr;
}
int CVICALLBACK Load_Picture (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
char picname[512] = {'\0'};
int ret = 0;
HistogramReport *report = NULL;
switch (event)
{
case EVENT_COMMIT:
ret = FileSelectPopup ("", "*.*", "", "Load; select an image file",
VAL_LOAD_BUTTON, 0, 0, 1, 0, picname);
if (ret == 1)
{
imaqReadFile (sourimage, picname, NULL, NULL);
imaqMoveWindow (0, imaqMakePoint (50, 260));
imaqDisplayImage (sourimage, 0, TRUE);
report = imaqHistogram (sourimage, 256, 0, 255, IMAQ_IMAGE_U8);
DeleteGraphPlot (mypanel, MYPANEL_MYGRAPH, -1, VAL_IMMEDIATE_DRAW);
PlotY (mypanel, MYPANEL_MYGRAPH, (*report).histogram, 256,
VAL_UNSIGNED_INTEGER, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1, VAL_RED);
}
break;
}
return 0;
}
