Pavtube DVD to iPod Converter can give you the favorite part of the image by the crop function.
Letter Box
Select the parts that you want to cut off to optimize the image and you can preview the effect after crop.
Crop Info
Show the information about the size of the cropped image and Aspect Ratio. You can drag on the image to choose the parts that you want manually or just change the number to set it. Both can reach your requirements.