A holographic imager (holo-imager for short) or holo-camera was a device that recorded the form and appearance of a subject in three dimensions, so that it could be reproduced in holographic form. It required that the subject be captured from multiple angles.
In 2370, a holo-cam was one of the items Miles and Keiko O'Brien intended to bring along on their vacation, but Miles forgot to bring it. He offered to return their runabout to Deep Space 9 to pick up both the camera and Molly, but Keiko rejected this suggestion. (DS9: "Tribunal")
In 2371, Quark attempted to secretly capture Major Kira Nerys on an imager, to fulfill his client Tiron's request for a holosuite program of her. Kira caught him and promised that if she found his imager pointed in her direction again, he would end up eating it. (DS9: "Meridian")
In 2375, The Doctor brought a holo-imager aboard a shuttlecraft mission to study a nebula. Seven of Nine told him that there would be no time for recreational activities. Later, in that year, Commander Chakotay took some holo-pictures aboard one of Species 8472's terraspheres. While aboard, a Replicant Boothby had a passing cadet snap a shot of him and the commander. Months later, The Doctor modified the resonance spectrum of his holo-imager to scan his subjects down to the subatomic level. This allowed him to render USS Voyager crew members as holograms in full anatomical detail, which he employed as part of his annual check-up. Later that year, Lieutenant B'Elanna Torres destroyed The Doctor's holo-imager when he was taking pictures in engineering. She had asked him three times to leave, however The Doctor kept "buzzing around, snapping pictures" for a photo essay entitled "A Day in the Life of the Warp Core". On April 22, The Doctor had the senior officers of the USS Voyager pose for a group photo on Ancestors' Eve. (VOY: "Drone", "In the Flesh", "Latent Image", "Juggernaut", "11:59")
In 2376, The Doctor again showed his propensity for holophotography when, in a visit to the Alpha Quadrant, he took pictures of Lewis Zimmerman's laboratory. Later, Lieutenant Reginald Barclay took a picture of the EMH and his creator. (VOY: "Life Line")