Live Mode or Library Mode: Which Kind of Shelf Search Are You Actually Doing?

Shelf Scan has two ways to search physical shelves, and the difference is not merely whether you feel like using the camera right now.

Live Mode searches a place you are standing in. Library Mode searches a visual record you decided to keep.

Both use readable text on shelves rather than a conventional item catalog. The useful choice depends on whether the collection is physically available at the moment you need the answer.

Use Live Mode when the shelf is in front of you

Live Mode opens a camera viewfinder, accepts a keyword, and highlights matching text as you sweep across a shelf.

That makes it suited to immediate retrieval:

• finding a particular author in a crowded home library
• locating a DVD without reading every spine
• searching a used bookstore shelf for a title or translator
• finding a board game in a closet
• scanning a classroom shelf for a keyword

The crucial fact is that the camera is acting as a temporary search surface. You do not have to save the shelf first.

If the question is Where is the thing in this room?, Live Mode is usually the shorter route.

It is also useful when you do not care about the collection after you leave. Searching a used bookstore, a library sale, or a friend's media shelf does not necessarily justify building a permanent visual record.

Use Library Mode when you need the shelf after you leave it

Library Mode saves shelf images and lets one keyword search across all of them later. Matches are highlighted on the saved photographs.

That changes the job. The photograph becomes a lightweight index to a physical collection.

Good Library Mode cases include:

• checking your home shelves while standing in a bookstore
• keeping several rooms searchable from one phone
• photographing books before they go into storage
• preserving a searchable view of a collection you visit only occasionally
• searching shelves that another family member or colleague may need to locate later

The question is no longer just Where is this item? It is Can I answer that question when the shelf is somewhere else?

Library Mode is not a conventional catalog

Saving shelf photographs does not create a title-author-ISBN database. Shelf Scan searches the visible text in the images.

That is a feature when your actual need is retrieval rather than inventory management. You do not have to enter hundreds of records before the system becomes useful.

It also creates limits. If a title is hidden, too small, badly lit, or unreadable in the photograph, Library Mode cannot search information that the image does not contain clearly enough for OCR.

Likewise, the photograph tells you what the shelf looked like when you saved it. If books move constantly, the saved location can become stale.

For a rapidly changing institutional collection, a real circulation or catalog system may be the better tool. For a private collection where the main problem is I know I own it; where did I put it?, searchable shelf images can be much less work.

Choose based on the lifespan of the question

One way to decide is to ask how long the answer needs to remain available.

Seconds or minutes: use Live Mode. You are standing there; find the item and move on.

Days or months: use Library Mode. Preserve the shelf so it remains searchable when the physical scene is no longer in front of you.

This distinction also helps avoid needless capture. Not every searchable scene deserves to become part of a saved library. A temporary retail shelf can remain temporary.

Conversely, if you repeatedly find yourself thinking I wish I could search the shelves at home from here, that is evidence that the shelf should probably be in Library Mode.

Sometimes the right answer is both

The modes are not competing systems.

You might use Library Mode to discover that the book appears on the saved image labeled Study — north wall, then use Live Mode after entering the room to locate it among two tightly packed rows.

Or you might rely on Live Mode for everyday searching and create Library Mode images only before travel, a move, or a long period away from the collection.

A large home library can therefore have a durable visual layer without requiring every search to happen through saved photographs.

If the collection moves often, maintain the photographs selectively

Library Mode works best when the physical arrangement is stable enough that the saved image still points to reality.

You do not need to reshoot the entire library every time one book comes off a shelf. But when a shelf is substantially reorganized, the old photograph stops being a trustworthy locator.

Update the shelf image when the cost of a stale match becomes noticeable.

This is the same principle that makes Shelf Scan useful in the first place: maintenance should be proportional to the retrieval problem. The goal is not a perfect digital twin of the collection. It is being able to find the thing.