How do I stabilize shimmering fine lines when zooming or panning?

I just completed an HD video that was exported in Standard Definition (SD) using Apple ProRes 422 codec. The video came out fine except when the clip of a JPG image zooms in or out using the zoom motion controls. The fine detail "shimmers" or "flutters", especially when zooming at a point when the image is nearly all the way zoomed out. (the fine detail is the smallest, then.) This is not a typical de-interlace problem where the whole image is highly erratic. The disturbance only happens on the fine detail in the JPG; the thicker lines are not affected. I applied a de-interlace filter and then separately applied a de-flicker filter. Neither of these filters had any effect. I was told by a highly regarded technician at our local access station who I would evaluate as an expert in FCP that this shimmering affect for fine detail was normal, especially in SD. HD, he said, will greatly reduce but will not eliminate it.
Does others have thoughts about this and possible solutions? Thank you

The flickering is an artifact of the two field structure of interlaced video. It is a result of very thin (often horizontal) elements that exist on one scanline as is common in text or titling. This can also be the case in images with great deal of detail with high contrast as well as when when you are engaged in pan/zoom moves on stills.
As the alternate fields play, the flashing element is essentially being turned on/off. The basic strategy is to get the element to exist over two scanlines so it is refreshed every time the field plays or to reduce the amount of contrast so the difference between ON and OFF is not noticeable.
Before you start any of these steps listed below, make sure you are viewing your material on an appropriate monitor. If you are working in an NTSC/PAL interlaced format (eg DV) you need an external TV monitor - not a computer screen. Without the appropriate device, you are playing blind.
Things to try (In increasing order of image degradation)
• (in FCP) field order>none
• (in FCP or Photoshop) reduce whites by 10% - reduces overly bright areas
• (in FCP) flicker filter - minimum
• (in Photoshop) motion blur>vertical> .2 - .5 pixels - blurs vertically only
• (In FCP or Photoshop) Gaussian blur> .2 - .5 pixels -blurs both horizontally as well as vertically
• (in FCP or Photoshop) deinterlace - throws away half the image and is generally not appropriate on scanned images
Remember: Unless you are viewing your work in the appropriate external NTSC/PAL monitor, you are playing blind. The computer monitor only shows you a proxy image.
One final thought, if you have slowed your material significantly, and have not used some sort of frame blending/optical flow processing, you may be simply duplicating frames to create the additional material to pad the playback. The flashing you see is the result of this.
good luck.
x

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