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To identify whether a frame is odd or even within an interlaced image, the following process can be followed:

1. Determine the field order of the interlaced video. The field order indicates the order in which the fields of the video are displayed on the screen. The two common field orders are upper field first (UFF) and lower field first (LFF).

2. Identify the fields of the frame. Each frame in an interlaced video has two fields – an upper field and a lower field. The upper field contains the lines with odd numbers, while the lower field contains the lines with even numbers.

3. Determine whether the first field of the frame is the upper field or the lower field. If the field order is UFF, then the first field of the frame is the upper field. If the field order is LFF, then the first field of the frame is the lower field.

4. If the first field of the frame is the upper field, then the frame is odd. If the first field of the frame is the lower field, then the frame is even.