Holographic Portrait

On: Mon, Feb 25, 02 02:53:03 PM

Jean Dufrasne wrote:

Hello, Of course, I'm waiting the next step on the HPC section of Frank's site. I'm thinking about this technique almost each day and I get an idea. In place of use a classic b&w film, we can use a digital camera to shoot the subject (we can even take animation with some digital camera), upload pictures in our computer and print them on transparent slide (same as these used for presentation). Advantages of digital images, no need to do a reverse process of film, images can be 'negativate' by a lot of software (Photoshop, PaintShop Pro,...) and even can be enhanced if something is wrong (removing background, modify contrast and/or brightness,...), you can see if shoots are corrects and then reshoot if something is wrong in a short laps of time, I see a problem (even two :) ) The definition (pixels by inch) of the picture is never good as photographic emultion and the definition of your printer must be good enough ,maybe better results with a laser printer (don't try to make hologram with this laser :D ) For now, it is just ideas. I have no time to try this. I must go back to my country (I live in Canada but move in a few month in Belgium), rebuild my holotable, find holoplate suppliers, purchase a digital camera :) and then I jump into with my two feet. But maybe you have some ideas. Jean


Colin Kaminski - Tue, Feb 26, 02 11:28:52 PM

Hi Jean, I have been following along with Frank's radio show as well. When you are ready with your new studio let me know and we can exchange notes. colinsk@pacbell.net

Stewart Shephard - Mon, Dec 09, 02 09:56:31 AM

Jean, your idea sounds very like my, which i have be working on for some this now. The text below is from my review on "DEVISES FOR CAPTIONING REALITY" which also his figures, can you send your email to stewart@shephard.com and we can take more about this? Stewart Shephard DEVISES FOR CAPTIONING REALITY Different Optical Methods for Taken Colour Photograph Holograms ------------------------------------------------------------ --------------------- Single Digital Camera for Captioning Horizontal Parallax This technique is the most cheapest method of taken horizontal parallax images. As there is only one single camera used, the most highest resolution image (15-20 million pixels) digital camera can be used. The advantages of using a digital camera over film camera is the cost of ‘film development’ and the limited number of images taken with roll film. There are three methods shown below of using a single camera to take parallax digital images. Manually The method used, is simpler to the HD movie camera, a single digital camera is mounted on a arched path. First a image is taken, then the camera is manually moved to the next illustrated marker on the track and another image taken, the length between takes is optionally base on number of parallax images (25-500). The more manually images taken between takes the greater the time length from the first to the last takes, this results in unwanted time- delays like the movements of shadows and light when viewing the hologram. This method can only taken images of unmoving objects, it cannot taken portraits of people. The big advantage is the taken of still-life and unmoving objects like museums artifice, architecture and interior scenes which all have controlled or unmoving light sources. Landscapes can also be taken without clouds and in some casts with still clouds. Natural effect like wind can cause trees & plants to move and also can cause movement in water eg. waves, ripples. This method can also be choosing to take time delay images like the changing of light in a scene. Automatic Trigger Markers This method can speed up the taken of a large number of parallax images. By hand it would take about half an hour to take around 100 or more images, using illustrated markers on the track. With “automatic trigger markers” the camera passes over each marker which causes or triggers the camera to take a image autumnally. The user can now take 5- 2 seconds to manual move the camera the full length of the track causing all the parallax images to be taking. This method his the advantage of cuts down exposure times which makes it more easer to take still-life, architecture, landscapes and some time delay portraits of people depending on the horizontal speed of the camera. Powered Automatic Horizontal Speed & Trigger Markers This method has the advantage of automatic trigger markers, and also ‘powered automatic horizontal speed’ which is the automatic horizontal movement of the rail mounted digital camera. This can be created by an electric power motor or “Manually Stored Rubber Power”. To cut down weight which can cause a greater velocity collision at the end, the cameras body cast is removed and springs mounted at the end to help slow down the camera after taken the parallax images. With this method, portraits or any high-speed exposures can be captured, but this causes two important problems that first need to be solved (see below). Two Problems Captioning large number of images The selected ‘Kodak DCS Pro 14N’ digital camera can only capture images at about two frames per second. If using the “Full Automatic Horizontal Speed method“ the camera needs to capture and store all 100 - 500 frames per second. To do this, the camera needs to be opened up and giving faster and more store space (software & hardware of the camera needs to be knowing). Automatic Horizontal Speed A devise needs to be found and then mounted to the track, “Manually Stored Rubber Power” could be a possible solution to this problem.

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