If the photos are imported from your memory card to the iPad's Photos app, there's a good chance they are still in the "Recently Deleted" album. Take a look there, as your iPad usually keeps the deleted photos for 30 days before permanently erasing them.
If you can't find the deleted photos on your iPad, you'll need a PC or Mac to recover them from your memory card. Although the deleted photos seem gone, they are actually still on your memory card until new data overwrites them.
If you didn't save any new files to the card, you'll likely get all the deleted photos back with a professional data recovery tool.
iBoysoft Data Recovery is such a memory card recovery tool you can trust to retrieve the deleted photos. It won't write data to your SD card, so it's safe to use. Besides, it is also praised for its excellent recovery rate and intuitive interface.
Follow these steps to recover deleted files from the memory card:
Step 1: Free download and install iBoysoft Data Recovery.
Step 2: Connect the memory card to your computer.
Step 3: Open the software and start scanning your memory card for files.
On a Mac: Select the memory card and click "Search for Lost Data."
On a PC: Click the "Data Recovery" module, then select the memory card and click "Next."
Step 4: Preview the found files.
Step 5: Tick the checkboxes before the files you want to restore, then tap the Recover button and save them to a different storage device that's not the memory card.