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Hello arifzaman,

I want to get xyz coordinates of each pointcloud

This answer represents how you can obtain x,y,z from UV (Image pixels).

https://answers.ros.org/question/372663/convert-pixel-coordinates-uv-to-pointcloud2-x-y-z-python/#372672

from that I want to separate min and max point xyz coordinates.

Now based on these points you can check based on z which is near and which point is far. Also, you can get right and left by minimum x coordinate and maximum coordinate.

After getting the min and max values of pointcloud i want to input my target xyz coordinates

You have to then convert this coordinate with respect to the world. For example, I am using a robotic arm at that time I have to calculate this position with tf package so I can give the command to my robot arm to go at this desired location.

want to compute the error difference.

I don't get this point. You want to calculate error based on what?

I am very much new to ROS and doesn't have good programming experience as well.

If you don't have a good programming experience that it will be a bit tough for you, but I think you will achieve this.

If you are facing any issue with this. Just drop a comment will try my best to answer.

Hello arifzaman,

I want to get xyz coordinates of each pointcloud

This answer represents how you can obtain x,y,z from UV (Image pixels).

https://answers.ros.org/question/372663/convert-pixel-coordinates-uv-to-pointcloud2-x-y-z-python/#372672

from that I want to separate min and max point xyz coordinates.

Now based on these points you can check based on z which is near and which point is far. Also, you can get right and left by minimum x coordinate and maximum coordinate.

After getting the min and max values of pointcloud i want to input my target xyz coordinates

You have to then convert this coordinate with respect to the world. For example, I am using a robotic arm at that time I have to calculate this position with tf package so I can give the command to my robot arm to go at this desired location.

want to compute the error difference.

I don't get this point. You want to calculate error based on what?

I am very much new to ROS and doesn't have good programming experience as well.

If you don't have a good programming experience that it will be a bit tough for you, but I think you will achieve this.

If you are facing any issue with this. Just drop a comment will try my best to answer.

answer. I hope you got your answer if you are having more douts feel free to comment.