I know that English people use "co-" prefix to show something is "joint" or "jointly Verb" with something else . But I encountered a key sentence in a article and I cannot understand it well:

"we use this classification method to represent images' attributes, and co-indexed images into a new file according to their characteristics"

what the "co-indexed" means in this sentence? An image is jointly indexed with what? I think it should be something like this

X is co-indexed with Y

does it mean that every pair of images is jointly indexed?

The phrase is not a technical one.

  • Do you have any more information that would shed light on the actual indexing scheme that was used to "co-index" the images? What characteristics were used, and how was the index organized? This might shed some light on the choice of "co-indexed" over "indexed."
    – phoog
    Commented Oct 28, 2015 at 22:02
  • One assumes it simply means they "ordered" the pictures according to their attributes, only "co-" implies that the "ordering" was done without affecting the primary order of the images. Eg, in a physical implementation separate index cards in a card file might be used to represent the image attributes. And on a computer it is, of course, much simpler -- just build an index over a "secondary key" of the computer database.
    – Hot Licks
    Commented Oct 28, 2015 at 22:44
  • (The terminology for this, even among computer database geeks, is not well-established. It's not unusual to have to flail about for a suitable description.)
    – Hot Licks
    Commented Oct 28, 2015 at 22:47

1 Answer 1


Co-Indexed seems to mean to Index (or sort) together

So when they stated

"co-indexed images into a new file according to their characteristics"

it just means their sorting the images into the file based on characteristics

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