I claim:
1. A steganographic image processing method comprising:
receiving first and second digital images;
transforming the second image into a noise-like image; and
steganographically embedding the noise-like image into the first image.
2. The method of claim 1 wherein the first digital image comprises video.
3. A steganographic image processing method comprising:
receiving first and second digital images;
steganographically encoding first data within the first digital image, the first data being dependent on the second digital image.
4. The method of claim 3 that includes generating the first data using the second digital image.
5. The method of claim 4 that includes generating the first data using the second digital image and second data.
6. The method of claim 5 in which the second data comprises key data.
7. The method of claim 3 wherein the first digital image comprises video.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An apparatus for electrically coupling a ridge waveguide on a first layer of a feed to a ridge waveguide on a second layer of a feed of an antenna, the apparatus comprising:
a first ridge waveguide having an input end and an output end, a first cross-section and impedance, and configured to receive a signal from a first direction;
a second ridge waveguide having an input end and an output end, a second cross-section and impedance, substantially parallel to the first waveguide and configured to output the signal in a second direction; and
a coupling slot located at the output end of the first ridge waveguide and the input end of the second ridge waveguide for propagating the signal from the first ridge waveguide to the second ridge waveguide,
wherein a ridge of the first ridge waveguide comprises a step to match the impedance of the second ridge waveguide with the impedance of the first ridge waveguide.
2. The apparatus of claim 1, wherein the second direction is opposite the first direction.
3. The apparatus of claim 1, wherein the apparatus is a junction propagating the signal with low loss.
4. The apparatus of claim 1, wherein the apparatus propagates the signal from a feed manifold to an aperture through a phase shifter, a transition, and a slot coupler.
5. The apparatus of claim 1, wherein the antenna is a radar system antenna.