Can I process image data with the Image Acquisition Toolbox without using the getData() function to display it?

I am working on the displaying of images through an external camera and I get stucked on the image display. I would like to obtain image displaying of about 40 fps but the getData() function from the Image Acquisition Toolbox is quite slow and makes it impossible to achieve this value. I have images of 780 x 580 pixels that I need to resize and display as a preview (the displayed size would be something like 760 x 400).

Is there any way to code this kind of program?