Shell Programming and Scripting

Hi all:
I have a directory where all of the subdirectories are named by the convention "images_#1:#2_Date." My goal is to get an array for each subdirectory that has the structure (#1,#2, int). I am able to use awk to print each subdirectory's values, but cannot figure out how to get them into an array. My script can be seen below:

#! /bin/bash
IFS=""
ls -f|sed 's/_/ /'|sed 's/_/ /'|sed 's/:/ /'|awk '{print $2,$3}'|sort

This gives output of:
501 12
502 14, etc.

I attempted:

#! /bin/bash
cd images
IFS=""
my_array=$(ls -f|sed 's/_/ /'|sed 's/_/ /'|sed 's/:/ /'|awk '{print $2}'|sort)
echo ${my_array[5]}

But this just outputs the entire list with a '[5]' at the end. I am at a loss for how to proceed. Any help you can provide would be greatly appreciated. Thanks.