Uneven Shading
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Join Stack Overflow to learn, share knowledge, and build your career. I'm working on a computer vision application that needs to infer the texture of a surface from a photo taken under illumination from a known direction. Take this embossed paper for example:. The brain makes various assumptions, such as that illumination comes from above and that the surface is contiguous, and arrives at a model of texture such that you can imagine what it would be like to run your finger over this surface. Measure the rainfall, and then supplement as needed.
Most lawns need about one inch of water a week. If you're in a particularly dry part of the season, water in the morning before temperatures rise. Fertilize with Pennington Ultragreen Lawn Fertilizer , following label directions. Bald or bare spots Patches of dirt in your lawn, whether due to heavy foot traffic or disease, are unsightly and invite the invasion of weeds. To fix, take these three steps: Dig up the spots, as well as several inches of lawn surrounding them. Lightly till the areas and rake Add topsoil and apply Pennington One Step Complete blend, following package directions and watering as needed.
Damage caused by pets Cat and dog urine contains damaging amounts of nitrogen, which can cause your lawn to brown. The solution is two-fold: Dig out the affected areas, layer in top soil, reseed, and then treat with a high-quality fertilizer, such as Pennington Ultragreen Starter Fertilizer. Create a designated play and relief area for your pet on the perimeter the lawn.
Rusts yellow-orange powdery spots Plant diseases known as rusts are caused by fungal spores, which can turn your lawn reddish-brown or yellow-orange.
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Rusts spread easily and weaken grass, so practice good lawn-care habits: Fertilize regularly with Pennington Ultragreen Weed and Feed. Don't overwater or underwater. Light rings filled in with grass Sometimes called fairy rings, these unsightly spots are often found near patches of mushrooms.
Moss Moss can quickly overtake lawns that are compact, wet, shady and underfertilized. To eliminate moss, try these strategies: Prune trees as appropriate to maintaining their health to decrease the amount of shade and encourage grass to grow.
How to Fix Common Lawn Problems
Aerate and de-thatch to encourage healthier grass and relieve compacted soil. Monitor both the amount of water the lawn receives and the pH level of the soil.
- Cleaning Textual and Non-textual Mixed Color Document Image with Uneven Shading.
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Perform a pH test at least once a year. For very acidic soil a pH number below 7 , treat with high-quality lime, such as Pennington Fast Acting Lime ; for very alkaline soil a pH number above 7 , add sulfur. Tackling Tough Turf Weeds. Please turn JavaScript back on and reload this page.
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Please type your message and try again. Is there a better way to only shade specific rows, or divide up my table in a better way?
Uneven Shading - Kindle edition by Joseph Devon. Download it once and read it on your Kindle device, PC, phones or tablets. Use features like bookmarks. Well, a way is to subtract the background with the paraboloid slide option. This should at least correct the uneven illumination. Even if you will have to play a bit.
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