Which is the difference between field mode and frame mode in interlacing?

Which is the best one for moving objects?

An interlacing camera actually takes two pictures to create each picture you see. These pictures are taken a fraction of a second apart, which allows the object of interest to move.
First, the camera takes a picture using the odd lines of the sensor. This is the first field. About 1/60 of a second later, it takes a picture using the even lines of the camera. This is the second field. The two pictures are combined by the frame grabber by interlacing the lines, which creates the frame you normally see as the image.
In frame mode, the two fields are combined to make a single image. In field mode, you get the odd lines as an image, and the even lines as a separate image.
When capturing a moving object, it is best to use a progressive scan (non-interla
ced) camera, which takes a picture using all of the lines simultaneously.
If you only have an interlaced camera, your best option is probably field mode, because the object doesn't have a chance to move. There are a couple of drawbacks to field mode, though. The height of your image is only half what it should be, which distorts everything and makes it difficult for measurements and the like. Also, the odd and even images are shifted by one line, so the live image appears to vibrate slightly if there is a lot of detail. You can't compare two consective images, because they are odd and even fields.
I hope this helps.
Bruce
Bruce Ammons
Ammons Engineering

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