ed

This code makes the opposite:
takes the shortest image and sets that value as the maximum height.
All other slides appear cropped

HOW TO USE: change the carousel id (#carousel-single) and paste after your carousel

<script> 
jQuery('.carousel').carousel({interval: 3000 });
// Normalize Carousel Heights - pass in Bootstrap Carousel items.
function carouselNormalization() {
var items = jQuery('#carousel-single .item'), //grab all slides
heights = [], //create empty array to store height values
shortest; //create variable to make note of the shortest slide

if (items.length) {
function normalizeHeights() {
items.each(function() { //add heights to array
heights.push(jQuery(this).height());
});
shortest = Math.min.apply(null, heights); //cache largest value
items.each(function() {
jQuery('.carousel-inner').css('height',shortest + 'px').css('overflow','hidden');

});
};
normalizeHeights();

jQuery(window).on('resize orientationchange', function () {
shortest = 0, heights.length = 0; //reset vars
items.each(function() {
jQuery('.carousel-inner').css('height','0'); //reset min-height
});
normalizeHeights(); //run it again
});
}
}
carouselNormalization();
</script>