Modifying images to get them clear

Hi everyone,

I'm currently working on a project where I have to track a moving object (completly black object) hitting a black straight wall. The whole Background was white. I transformed the colour image to an greyscale image and then used the imbinarize function. It always worked until now.

Now I have a few videos where I have a shadow that partially covers the wall. That is a problem because I need to see the object hitting that clear wall. I'll attach a pic of what it looks like and of what I want it to be.

I also got a problem when imbinarizing that image, because sometimes the wall is way too exposed to the light ( the wall reflects a lot of light and becomes grey/white ).

I've already used a few functions like imadjust and tried to use the different settings of imbinarize but it didn't get any better...

In easier words I want the Projectile and the Wall to have clear outlines.

Has anyone an idea how I could work this out ?

Thanks in advance for any response.

Answer 1

[Parth Dethaliya]

If you are using imbinarize function in default condition then this problem may occur, Try changing the threshold values for binarizing.

Threshold = graythresh(GrayImage);

This function gives the default threshold values ranging from 0 to 1, try increasing this value and binarize image like,

Binary_Image = imbinarize(GrayImage,Threshold+0.01);

you can change the number 0.01 iteratively to find better results depending on your application.