What is the TOD Method?

The Triangle Orientation Discrimination (more commonly known as the TOD method) has been extensively researched and tested using a wide range of camera systems with advanced processing image techniques, such as dynamic super resolution and local adaptive contrast enhancement. It was initially developed as an end-to-end sensor performance test. An observer judges the orientation (apex Up, Down, Left or Right) of equilateral triangles of various sizes and contrasts using the sensor under test. Thresholds are defined at the 75% correct contrast at a given angular size or 75% at a given contrast. A test to convert the observer response collection into the TOD curve is implemented; a threshold curve of contrast versus reciprocal triangle angular size and it is this threshold that characterizes the quality of the imaging system. EOI's IR test bench was the first on the market to use TOD.