An imaging system (16C, 16C') comprising: separate first and second sensor elements (30A, 30B) of one or more optical sensor arrays (22, 22A, 22B); an objective lens system (36A, 38A', 36B, 36B') configured to direct light received at a given angle onto the first sensor element and onto the second sensor element; a polarization filter system including a first polarizer portion (38H, 38H') positioned to filter the light en route to the first sensor element and a second polarizer portion (38V, 38V') positioned to filter the light en route to the second sensor element, the first and second polarizer portions providing unequal relative attenuance of nonparallel polarization components of the light received at the given angle; and logic to acquire a first digital image by interrogating at least the first sensor element, acquire a second digital image by interrogating at least the second sensor element, co-register the first digital image and the second digital image having overlapping fields of view, associate a pixel element of the first digital image with electronic display content being displayed on a display screen of another electronic device within a shared physical environment based on a difference in light-intensity value of that pixel element relative to a corresponding pixel element of the second digital image, and map said display screen of another electronic device onto a frame of reference of the imaging system based on the location of pixel elements associated with the electronic display content, thereby mapping said display screen of another electronic device onto a coordinate system that spans the shared physical environment. separate first and second sensor elements (30A, 30B) of one or more optical sensor arrays (22, 22A, 22B); an objective lens system (36A, 38A', 36B, 36B') configured to direct light received at a given angle onto the first sensor element and onto the second sensor element; a polarization filter system including a first polarizer portion (38H, 38H') positioned to filter the light en route to the first sensor element and a second polarizer portion (38V, 38V') positioned to filter the light en route to the second sensor element, the first and second polarizer portions providing unequal relative attenuance of nonparallel polarization components of the light received at the given angle; and logic to acquire a first digital image by interrogating at least the first sensor element, acquire a second digital image by interrogating at least the second sensor element, co-register the first digital image and the second digital image having overlapping fields of view, associate a pixel element of the first digital image with electronic display content being displayed on a display screen of another electronic device within a shared physical environment based on a difference in light-intensity value of that pixel element relative to a corresponding pixel element of the second digital image, and map said display screen of another electronic device onto a frame of reference of the imaging system based on the location of pixel elements associated with the electronic display content, thereby mapping said display screen of another electronic device onto a coordinate system that spans the shared physical environment.