how can i calculate -3dB of given picture?

how can i calculate -3dB of given picture?

http://kmu.site40.net/images/19d3c9e40467.jpg

Answer 1

[Honglei Chen]

You could do 3dB in U and V direction separately along 2D cut.

[Mohammad Khishe]

could you write code for this goal?

[Walter Roberson]

Note: flagging a message is only to bring it to the attention of the forum editors so that they can review it for inappropriate content. The person who posted a message that is flagged is not notified. Using replies is appropriate for your purpose instead of flagging a message.

Answer 2

[Walter Roberson]

You cannot calculate -3dB of an image. You need to calculate -3dB of the data that was used to construct the image.