opencv open image without jerking - c++

Question

I am using opencv2 to open a series of images (On raspberry pi) I find the transition is very jerky (ie opening the image) is there any way to smooth this?
The code snippet below is what I am using atm (I guess I should use mat:)
void loadImage()
{
int nImages = 6;
for (int i = 0; i < nImages; ++i)
{
IplImage *image;
char filename[100];
strcpy(filename, "images/");
char frameNo[10];
sprintf(frameNo, "%03i", i);
strcat(filename, frameNo);
strcat(filename, ".jpg");
image = cvLoadImage(filename);
cvNamedWindow("pic");
cvShowImage("pic",image);
cvMoveWindow("pic", 0, 0);
cvWaitKey(1000);
}
}

Answer 1

You have to load your images either in other thread, or before the loop if you're lazy. It should be something like this:
void loadImages() {
IplImage *images[NUM_IMAGES];
images[0] = cvLoadImage("filename1.jpg");
images[1] = cvLoadImage("filename1.jpg");
images[2] = cvLoadImage("filename1.jpg");
.
.
. (etc)
}
void showImages(){
loadImages();
for (int i = 0; i < nImages; ++i){
cvNamedWindow("pic");
cvShowImage("pic",images[i]);
cvMoveWindow("pic", 0, 0);
cvWaitKey(1000);
}
}
Of course, array of pinters to images *images[] should be declared as global, or you should pass it from loadimages() function to showImages() (Better solution).