The Doctor with a holo-imager.
A holographic imager (holo-imager for short) or holo-camera was a device that recorded holo-scans, so that it could be reproduced in holographic form. It required that the subject be captured from multiple angles.
In 2370, a holo-camera was one of the items Miles and Keiko O'Brien intended to bring along on their vacation, but Miles left it behind by mistake. 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")
A Ferengi holo-imager
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")
The prop used was actually the Bajoran tricorder prop later seen in the episode "Indiscretion" with an added image capture element. The prop later appeared as a controller for restraints in ENT: "Canamar" and as a Klingon communicator in ENT: "Affliction" and was sold off on the It's A Wrap! sale and auction on eBay. [1](X)
While the episode's dialogue referred to it as a "holo-imager", the script also calls it a "holo-camera". [2]
In 2373, The Doctor used his imager to take pictures of Ensign Ahni Jetal's birthday party. He also took the camera on a shuttlecraft with her and Harry Kim. (VOY: "Latent Image")
The image displayed when the "shutter" snaps
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 junior grade 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")
The call sheet for "In the Flesh" identifies this piece of technology as "Holo-Imaging device".
In 2376, The Doctor again showed his propensity for holophotography when, in a visit to the Alpha Quadrant, he took pictures of Doctor Lewis Zimmerman's laboratory. Later, Lieutenant Reginald Barclay took a picture of the EMH and his creator. (VOY: "Life Line")
In 2378, Lieutenant junior grade Tom Paris jokingly stated that he should have brought a holo-imager to Otrin's homeworld to show his wife that she wasn't missing anything. (VOY: "Friendship One")
In 2380, Ensign Sam Rutherford found himself at a Gorn wedding on an unknown planet, where two of the guests were recording the proceedings with holo-imagers. (LD: "Veritas")
The Gorn cameras are identified in the LD Season 1 DVD special features as the same model used by The Doctor on Star Trek: Voyager.