Variable sharpness of objects in an image

Hello everyone, I have a question. In an image, I have 5 different objects and the sharpness of objects varies in the same image. Can anyone help me, how I can rank the objects according to the sharpness of objects in the image?

[Walter Roberson]

Please expand on what you mean by 'sharpness' ?

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

[Md]

sharp object means that the object is in the focal plane of the camera, and the objects away from the focal plane of the camera are not as sharp as it is in the focal plane.

Answer 1

[Image Analyst]

Here is a description of how sharpness (focus) is determined by camera manufacturers: http://en.wikipedia.org/wiki/Autofocus