Arthur takes out his phone and runs an application which promptly accessed a search engine and rapidly displayed his query's image, immediately switching to the next image result as soon as the current one loaded. In this case, the query was that of glasses of wine. The camera units in his 'face' rapidly saved the images, sending their data through the quantum computer components located within him before unceremoniously dumping them post processing. Save, process, dump. Save, process, dump.
Quantum computers weren't exactly mechanical Deus ex Machinas and indeed had their limitations. They were good for running complex algorithms like the one they were currently running, but they still can't afford to save every image Arthur took.
Then, he used his application to search for images not containing a glass of wine and repeated the process. Now, the heuristic was calibrated. Arthur idly gazes across the room, his camera units rapidly taking pictures of the area before running them through the program.
His gaze stops. It found something. Next, he stares at the room and lets the image he sees get subdivided into individual images (five to be exact), each of which when then sequentially input into the software. The images that were once again returned a positive result were then further subdivided in the same manner and run through again. This repeated until the image quality was too poor for further subdivision into inputs that would be processed correctly.
He proceeds to saunter over to get the drink in question. He didn't have to do it of course, he could of just looked around, but that would have probably taken longer.