how to detect only fish image object and remove all the other object from the image?

i wrote a program to detect all the object in the image. but i want to detect only the fish image and other objects are set to black or white? please help me

Answer 1

[Image Analyst]

If you have a video, why don't you look for things that move between frames. You can threshold the optical flow or something.

[ARJUN K P]

Sir am using images... detect fish from underwater images

[Image Analyst]

You have to detect the fish. This can be very difficult. To find a flounder in the sand or a stonefish on a reef is nearly impossible from still images. Unless you can say something about your dark blobs that distinguishes them between a fish dark blob, and a non-fish dark blob, you can't proceed. And I supposed you want to detect the fish at virtually an angle, like even head on when they are very narrow. And you refuse to use video to help you. Good luck.

[ARJUN K P]

Thanku you sir

[Miguel Capelo]

Can you explain it better @Image Analyst ?

I have a question here:

https://www.mathworks.com/matlabcentral/answers/583826-fish-detection-and-classification-of-its-species-from-a-movie?s_tid=prof_contriblnk

[Image Analyst]

Miguel, see my Image Segmentation Tutorial if you want a tutorial on how to find and measure blobs (such as fish) in an image via thresholding.