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Take a look at https://github.com/lucasw/rviz_textured_quads (See also #q22730).

How high is your resolution and frame rate?

When you say incrementally growing do you mean that you'd like to transmit smaller images that update a larger image (like costmap updates) rather than retransmitting the entire image every frame? It probably wouldn't be too hard to make a version of rviz_textured_quads that can work like that.