82066163-7050-ab49-b8cc-b3855e8d2252
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This extension unit is used for Logitech's RightLight Technology, employed by most Logitech webcams (including the QuickCam E3500). It uses software based multi-field measurements to manage auto-exposure settings on-the-fly. The technology works as follows:
* The image on the cam will be split into eight fields, each split into left and * ----------------- right halves. To get the light intensity of one field, the * | | | | | host should SET the address of the field and then GET the * | c4 | c5 | result. The result has a length of two bytes, with the first * ----------------- byte representing the measurement from the left half of the * | | | | | field, and the second byte the value for the right. * | c6 | c7 | * ----------------- * | | | | | * | c8 | c9 | * ----------------- * | | | | | * | ca | cb | * ----------------- * .... /* With CS 5 we set the address of field, on CS 6 we get results. */ #define XU_CS_MESURE_FIELD 5 #define XU_CS_MESURE_FIELD_RET 6 ....
