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Useful Sample Codes for VC Smart Camera

(Please see www.vision-components.com for more information)

load image & resize it ============
image imgFromFile, imgFromFileResized;;
ImageAllocate(&imgFromFile, IMAGE_GREY, width_org, height_org);
ImageAllocate(&imgFromFileResized, IMAGE_GREY, width, height);

fread_image(img_name, &imgFromFile);

resample_bilinear(&imgFromFile, &imgFromFileResized);

ImageFree(&imgFromFile);
ImageFree(&imgFromFileResized);
============
save image ============
rc = fwrite_image(path, &(cpt.sen[0].img));
rc = fwrite_image(path, &imgFromFile);
============
access to pixels ============
image *img; // input image
int y, x;
int row[img->dx];
memset(row, 0, img->dx*sizeof(int));

//project (sum of) columns to row [width]
for (x=0; x < img->dx; x++)
{
    for (y=0; y < img->dy; y++)
    {
        row[x]+=img->st[y*img->pitch + x];
    }
}
============
snap image ============
// we can use vc_capt(&cpt)
// or vc_capt_request(&cpt)
// and vc_capt_wait(&cpt,-1);
// the snap times are the same (~ 35 ms)
I32 rc=0, err=0;
VCCamCfg cam;
VCCaptCfg cpt;
// init the camera
rc = vc_license_init("vclib");
if(rc<0){err=rc; goto end;}

rc = vc_cam_init(&cam, &cpt, NULL, NULL, NULL);
cpt.sen[0].img.type = IMAGE_GREY; //IMAGE_RGB; select this if rgb camera
if(rc<0){err=rc; goto end;}

cpt.sen[0].shutter = 12345;

rc= vc_capt(&cpt); //This function sends a request for an image acquisition and then waits for the image to be taken. There is no timeout.

rc= vc_capt_request(&cpt); // This function sends a request for an image acquisition.
                           // A successful image acquisition is based on a proper initialized and set up capture configuration

rc= vc_capt_wait(&cpt,-1); //This function waits for an image acquisition requested by the function named vc_capt_request() to be finished.

if(rc<0){err=rc; goto end;}

...
end:
    vc_capt_deinit(&cpt);
    vc_cam_deinit(&cam);
============
save image ============
image img;
...
fwrite_image(fname, img);
============
draw & fill rectangle void drawRect(image *img, RECT r, U8 color)
{
    lined(img, r.x, r.y, r.x + r.width, r.y, color);
    lined(img, r.x + r.width, r.y, r.x + r.width, r.y + r.height, color);
    lined(img, r.x + r.width, r.y + r.height, r.x, r.y + r.height, color);
    lined(img, r.x, r.y, r.x, r.y + r.height, color);
}
void drawRect1( image *img, POINT p1, POINT p2, POINT p3, POINT p4, U8 color)
{
    lined(img, p1.x, p1.y, p2.x, p2.y, color);
    lined(img, p1.x, p1.y, p4.x, p4.y, color);
    lined(img, p3.x, p3.y, p2.x, p2.y, color);
    lined(img, p3.x, p3.y, p4.x, p4.y, color);
}
============
// use drawRect function
RECT roi;
...
drawRect(img, roi, 200);
============
POINT p1, p2, p3, p4;
...
drawRect1(img, p1, p2, p3, p4, 128);

POINT p[4];
// assign values to p
...
// fill rectangle
int pList[8];
for (x=0; x<4; x++)
{
    pList[x*2]   = p[x].x;
    pList[x*2+1] = p[x].y;
}
fill_polygon_simple (img, 0, 4, pList, 255);
standard error code ============
Most of the functions return a standard error code:
#define ERR_NONE 0     /* no error           */
#define ERR_FORMAT -1  /* image format error */
#define ERR_TYPE -2    /* image type error   */
#define ERR_MEMORY -3  /* out of memory      */
#define ERR_LICENCE -5 /* licence required   */
#define ERR_OPEN -19   /* open error         */
#define ERR_MODEL -51  /* model does not fit licence */
============
measure time ============
double time_now()
{
    struct timeval tv;
    gettimeofday(&tv, NULL);
    return ((double)tv.tv_sec + ((double)tv.tv_usec*1.0e-6));
}
============

 

 

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