As a sign maker, for estimating I can usually interpolate sizes from an image, the sizes are enought to get rough costing for materials etc and then if the job goes ahead then I take precise measurements. Most of the time I don't carry a ladder nor does my measuring tape hold still enough to get the dimensions I need. So I usually make proxy measurements and interpolate them.
I wondered if there is a way to make this process more accurate.
For example in the image below, The red dimensions are 550mm wide, and come out correct on the lens corrected image (give or take 5mm).
The blue dimensions should be 1785mm but the perspective distortion in the image is showing at as ~1900mm, meaning the green dimensions are also distorted.
Is there a way to lens correct or perspective correct in image, something that maybe stretches the image more towards the edges than in the middle? I am using photoshop, but if there is another tool/software/plugin please advise.
I have attached the original, unedited image as well.