Prior art

The search results for "Google Patents US4647975", "Google Patents US5168532", and "Google Patents US5671013" did not directly return the patent details. Instead, they returned general links to Google Patents or USPTO search tools. I need to explicitly navigate to the patent documents to extract the required information.

I will directly use the provided Google Patents URL for US9232158 to ensure I'm getting the precise citations as listed in its text. Then I will search for the specific cited patents within Google Patents.

Since I have the full text of US9232158, I will extract the information for the background prior art patents directly from it, then conduct targeted Google Patent searches for each of those to get the full citation details if not explicitly in the provided text.

From US9232158's background section:

• "U.S. Pat. No. 4,647,975 describes a method based on the acquisition of two or more images, each having an exposure time. Once numerous images have been taken at different exposure times, the images have to be fused or merged to form one single piece of pixel information having a wide dynamic range."
• "U.S. Pat. Nos. 4,647,975, 5,168,532, and 5,671,013 disclose the use of a selection rule to combine information from the most suitable of the multiple images. This method however exhibits undesirable temporal aliasing if the scene or camera is moving because the two or more images having different exposure times are captured using the same image sensor and thus are not captured concurrently."

This already gives me a good brief description of these patents as perceived by the inventors of US9232158. I still need the full citation and dates.

I will proceed by searching for each specific patent number on Google Patents to retrieve its full details.