Bokode

Overview

A Bokode is an optical data tag developed at the MIT Media Lab that packs far more information than a conventional barcode of the same size and can be read by an ordinary camera from several metres away [1]. Its name is a portmanteau of bokeh (the photographic term for out-of-focus blur) and barcode, because the tag is read not in sharp focus but through a camera's defocus [1]. It is notable as a genuinely novel optical-encoding idea — encoding information in the angular dimension of light — rather than another flat 2D matrix.

History

Bokodes were developed by a team led by Ramesh Raskar at the MIT Media Lab and presented at SIGGRAPH 2009 in a paper titled "Bokode: Imperceptible Visual Tags for Camera-Based Interaction from a Distance." The authors were Ankit Mohan (lead author), Grace Woo, Shinsaku Hiura, Quinn Smithwick, and Ramesh Raskar [1][2]. The work was publicly presented in 2009 [1].

Technical specification

A Bokode is a tiny circular tag, about 3 mm in visible diameter, built from an LED behind a photomask (the data pattern) with a small lens (lenslet) in front [1]. The data pattern itself is made of tiled Data Matrix codes arranged so they become legible when out of focus [1]. Information is encoded in the angular dimension of the emitted light: rays leaving the tag vary in brightness with the angle at which they exit, and the lens maps angle to position [2].

Reading exploits the bokeh effect. To a camera focused on the scene, the Bokode appears as a small bright dot; but when the camera is focused at infinity, the defocus blur expands the tag's pattern across many sensor pixels, magnifying the otherwise microscopic code so it can be decoded [1]. Features around 15 μm can be resolved this way, and unmodified standard cameras (including phone cameras) can read the tag from a few metres — sources cite distances up to about 2–4 m — while also recovering the relative distance and angle to the tag [1]. The tag can hold thousands of bits, far more than a same-area printed barcode [2].

Use cases

Bokode was pitched for camera-based interaction at a distance. Proposed applications include classroom quizzes with instant per-student response tracking, museum labels that push background information to a visitor's camera, restaurant menus readable from the sidewalk, motion-capture systems with roughly tenth-of-a-degree angular precision, and security/identity uses as an alternative to RFID [2]. The ability to read pose (distance and angle) makes it especially suited to augmented-reality and tracking research rather than ordinary product labelling [1].

Implementations

Bokode is a research prototype, not a deployed commercial standard. Early active prototypes used a powered LED and cost around $5 each, with projections of dropping to roughly 5 cents at scale [2]. Passive variants were developed that reflect ambient light like an ordinary barcode, avoiding the cost and power of an LED, and a rewritable form was referred to as a "bocode" [1]. No mass-market reader ecosystem ever shipped.

Comparison

Against QR Code and Data Matrix, Bokode wins on density and on remote, angle-aware reading: it crams thousands of bits into a 3 mm dot and can be read from across a room while reporting the camera's distance and angle — something flat printed codes cannot do, since they must be in focus and reasonably large in the frame [1][2]. Its disadvantages are decisive for adoption: the active version needs a powered LED and a precision lenslet, making it far more expensive and harder to manufacture than ink-on-paper, and it requires the user to deliberately defocus the camera. QR/Data Matrix are essentially free to print and read with in-focus capture, which is why they dominate while Bokode remained a lab demonstration [1].

Fun facts

Bokode was widely described as a "barcode you can read from across the room," a sharp contrast to scanners that must be held inches from a label [2]. Lead author Raskar framed it as a new optical-encoding category: there had previously been a handful of ways to encode information optically, and Bokode added another by using the angular dimension of light [2]. Because a Bokode can be covered by any opaque material, it offers simpler privacy control than an RFID tag, which needs radio-frequency shielding [1].

Status

Historic research prototype. Bokode was a 2009 MIT Media Lab demonstration and never became a commercial standard or shipping product; it remains a frequently cited example of unconventional optical tagging [1][3].

Sources

1 Bokode — Wikipedia — Wikipedia, accessed 2026. 2 Barcodes for the rest of us — MIT News, 2009. 3 Bokode: Imperceptible Visual Tags for Camera-Based Interaction from a Distance — project overview — MIT Media Lab.

Deployments

No country reports mention this standard by name.

Regions / aggregations not mapped to a single country

• Universal