Method and Apparatus for Presenting Audio and Visual Information

A method of recording or presenting audio-visual information presented by a lecturer, comprising the steps of:

• providing a display screen, a light source iniecting predominantly blue light into an edge of the screen, and a visible wavelength video camera imaging the display screen and imaging the lecturer through the screen;
• filtering predominantly blue light from the imaging of the screen;
• recording the lecturer making a presentation both verbally and by writing on the screen;
• and
• reversing a left-right-orientation of the screen and the lecturer imaging, wherein writing made by the lecturer on the screen is oriented in a reverse image and readable in the screen imaging.

A method of recording or presenting audio-visual information presented by a lecturer, comprising the steps of:

• Providing a generally planar and generally transparent screen,
• Injecting light into an edge of the screen at predominately around 405 nanometer wavelengths, wherein the lecturer presents visual information by writing on the screen with a fluorescent marker,
• Providing a visible wavelength camera to image the lecturer and the writing through the screen, wherein the lecturer is seen to be facing a viewer through the screen,
• Filtering at least about 85% of light in the range of 410 nanometers to 460 nanometers from the image, and
• Reversing the left-right orientation of the lecturer and writing on the screen, wherein an image of the lecturer and writing made by the lecturer on the screen is reversed in the imaging of the lecturer and writing through the display screen and the writing thereby readable.