stitching - 2

The left most part is incorrect...don`t know why /_\

Both of the photo set are taken without tripad.

I got more problems now :

• It took too much time in matching. So......maybe I need something like kd tree ? (but I`m lazy)
• I calculate the camera parameters by SBA one by one. But can`t optimize all of them at the same time (after getting rough result ), the image above are stitched by those "rough" result. There may be some bug in my sba usage.
• Multi-band blending ?

stitching

Apply SBA, still can`t get good result and don`t known how to get better focal length.

20100408

p.s.

Now I got better result due to fix a typo in DLT. XD

stitching with DLT

Quick testing with direct linear transformation. The result is better than affine transformation. I guess it`s time to use bundle adjustment.

SIFT with up scale

without up scale :

with up scale :

Up scaling provide about 50% matched features. Now I have to work on memory & cpu usage balance.

Affine Stitching

After adding hat function, clamping descriptor and remap float to u8, I got better result. The paper weighted each bin in descriptor with 1 - d. I don`t know why I can`t get better result. But clamp magnitude to 0.01 ~ 0.99 works fine in my implementation.

I can`t wait to try this ! So I made a simple implementation to stitch image : SIFT + Affine + RANDSAC + SVD. Replace affine model should get better result, I will try it later.

Line Rasterization

SIFT in real scene

My implementation is still not as robust as imagination. This is one of my better test.