Bachir Babale
Project 2 : Panoramic Mosaic Stitching
The image above is the result of a quick pass of my first panorama through Photoshop by modifying the highlights and shadows image properties.
I took 3 sequences of 10 pictures: 2 with a tripod, and one simply with a handheld camera.
My initial pictures suffered from poor exposure which led to the color band artifact that you can see on all resulting 3 panoramas.
I unsuccessfully experimented with altering image color intensity and saturation during the blending phase.
If I was to do it again, I would take more pitures in a series (10 barely enough), and I would be more careful about the exposure
Panorama I
 |
The base pictures were taken with a tripod.
They worked fairly well besides the exposure of the pictures on the right that remove the details in the sky.
| Medium | Large |
Very Large
|
Panorama II
Panorama III
 |
The base pictures here were taken with a tripod. The Lucas Kanade code in the solution and in my implimentation returns
-1 values for the stitch in the left corner. No match?
| Medium | Large |
Very Large
|
Test Image
Uniformizing Colors
I attempted to uniformize the colors to mitigate the problems caused by poor exposure in my shots. I converted the color format
from RGB to HLS (Hue, Luminance, Saturation) and used two different techniques to changed the colors. My first technique was to evaluate the
average luminance and saturation in all pictures, evaluate a ratio with respect to a reference picture, and adjust the color in the pictures
using the ratio before blending. The second technique, instead of a ration, used a simple average difference.
Technique II worked well with my first panorama; otherwise those attempts showed that something more sophisticated,
like Histogram Uniformization was needed.
Panorama I - Technique I
Panorama I - Technique II
Panorama II - Technique I
Panorama II - Technique II
Panorama III - Technique I
Panorama III - Technique II
