Enahncing Image to identify Vehicle Plate number

Thanks for the input.
It is from an in vehicle type camera
The angle of view distorts the image somewhat (or my sight is not what it used to be), was looking for some contrast adjustment/extrapolated that could make it somewhat easier to read/guestimate.  the number is a 3alpha-4 numeric
I think the first three are 'visible" the last two are as "well".  Need to see whether ........
Used VLC,Irfanview, and other open source to grab a snapshot/frame from the AVI.
grabbing the section of interest, but the options/filters available and my guessing on which filters to apply, does not improve/help.
The angle where one sees the least distortion is between 25°-35° from driver side centered at the center of the vehicle

The vehicle passing on the left side.

Seen newer HD PTZ cameras that have a 1:10000 optical zoom, that can be programmed to focus/zoom in on items of interest, not an available option in the device in use.

I did, but the angle of the view when it is largest.  
I tried, but the tools I mentioned the image distorts. Tied the brightness/contrast..

I can, what format bmp, jpg, png, tiff is preferable? I'll post the snippet of interest only.

I did, the formats I asked deal with which make it better for enhancement/image processing.

Thanks for the response, attaching five images at different distances from closest to farther.
Did not imbed the image for display.
vlcsnap-6309-12-22-09h34m16s037.png
vlcsnap-6501-12-11-18h51m15s370.png
vlcsnap-2099-09-24-10h15m08s876.png
vlcsnap-8138-09-21-03h04m20s109.png
vlcsnap-0940-11-11-07h28m57s929.png

Looking at the vehicle in the road moving forward. Not vehicles around or I front.

Thank you for your efforts, info and insight.

You're welcome Arnold and  thankyou