Three-dimensional imaging of veins

A three dimensional imaging system comprising:

• a first laser configured to emit light at a first wavelength,
• a second laser configured to emit light at a second wavelength being different from said first wavelength,
• means for incrementally increasing an intensity of said first wavelength of light emitted by said first laser,
• means for scanning said laser light from said first and second lasers onto a target surface,
• a photodetector configured to receive and to be responsive to light at said first wavelength reflected off the target surface and from under the target surface, said photodetector further configured to output an analog signal representing at least one vein image based on said received light by differential absorption of said first wavelength;
• wherein said at least one vein image comprises a plurality (N) of vein images at incrementally distinct depths beneath the target surface as a function of said incrementally increasing intensity of said first laser;
• and
• means for image processing configured to layer a vein image corresponding to a first depth over a vein image at a second depth, to create a processed vein image, said means for image processing further configured to transmit said processed vein image as an analog signal to said second laser;
• wherein said second laser and said means for scanning are configured to project said processed vein image onto the target surface.