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For first implementation it's ok to not have perfect distribution. And such low amount of possible values (360) is the limitation of algorithm for analog television (CVBS). There increasing steps for more complex permutation makes picture quality worse during descrambling.

We can make LFSR longer than 9 bit, let's say 18 bits. And so seed will also consist of 18 bits (524287)

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Right now I generate two arrays[360] in java and then use them in fpga's. One array is for scrambling, other for descrambling. Idea itself works, image is scrambled and then descrambled with appropriate quality loose.