Simple, streaming, lossless image compression
You can consider using Huffyuv : http://neuron2.net/www.math.berkeley.edu/benrg/huffyuv.html

This is no great better than simple zip, but still slightly optimized for images. 

Any Image related compression comes from the techniques like Vector quantization or Transform coding. In order to make use of transform such as DCT/Wavelet yet make it lossless you can think of JPEG-LS or JPEG2000 for compression. Only thing is, it is not streaming in your sense of definition.