A depth-based image enhancement system is disclosed. An image pickup method includes acquiring a first image without a flash and a second image with the flash, generating a third image by down-sampling the second image, calculating a brightness difference between the first image and the third image, calculating a first flash reflection intensity from the brightness difference, and calculating a white balance gain. The received application-level request is stored locally in response to determining to defer transmission of the received application-level request based upon the evaluation of the at least one application-level directive within the collected BI information relative to the current network transmission conditions. According to various alternative embodiments, the implant is elastically compressible, or can be formed from self-expanding foam or sponges, and can be implanted through a cannula or by injection, as well as by open procedures. The present invention ensures the enhancement of neuroprotection, such that it is promising for preventing or treating various diseases caused by exposure to nerve gas.