Stereo pictures (> 127 pieces)
A stereo image is a picture or video sequence using two separate images to achieve a stereo effect. To create a stereo image in a three-dimensional modeling program, you need to do a double scene rendering - from two cameras that correspond to the eyes of the observer.
How to watch stereo pictures
Various devices and methods are used to create and view stereo images. Watching is simple, harder to learn. And the monitor will turn out no worse than on paper! But when printing with poor quality or high magnification, printer errors are visible i.e. the picture is not visible ...
- We are approaching almost tight to the monitor (~ 5 cm. To the screen).
- We relax our eyes and do not try to focus.
- Meeeeedly we move our head back (~ 15-20 cm from the screen).
- If you "caught" the trick during the "departure", then return to step 1.
- If you feel that soon 21 cm. "Departure" linger in this position.
- The main thing is not to "catch" the focus, the point is - the image should remain as if out of the picture.
All stereo images have been successfully tested by me! They work! If you can’t see, try another one!
Not everything is easy to see, for some it takes a lot of strength and patience ... And I do not advise you to get involved! Nothing happens when overvoltage.
PS At the bottom of the page you can download all the images in one archive.
- The parallel gaze method allows you to watch a full-color stereo picture without the presence of any equipment, the stereo effect is achieved by keeping your eyes farther from the image plane. The method is suitable only for viewing relatively small images of 60-70 mm each, which is due to the interpupillary distance of a person. The method also does not allow “liberties” with image scaling.
- The cross-eye method is similar to the previous one, but the eyes are reduced in front of the image (“on the bridge of the nose”). The previous method, in which the eyes look as if further from the image, is preferable, since it causes less eye strain. On the one hand, a cross pair can be of arbitrary size and arbitrarily scaled during viewing, on the other hand, an imaginary image appears between the screen and the observer, which limits the size of the depicted object or turns it into a “puppet copy”.
- The method of mirror separation of images (mirror split) allows you to do without eye strain, using a mirror to separate the fields of view. The stereo image for this method, as well as for the previous one, is left and right frames, only one of them is mirrored. The mirror is placed perpendicular to the face, close to the nose, and perpendicular to the picture, in the place of separation of the left and right frame. Usually the left frame is mirrored relative to the true position of the object. In this case, you need to look to the right with both eyes: the right eye looks at the right picture, the left through the mirror - at the left. By smoothly adjusting the mirror, you need to combine the images so that a stereo effect occurs. The advantage of this method is that using only improvised materials, you can get a full-color stereo image. The disadvantage is that you have to place your face close to the screen or use a very long mirror. Large images require wide mirrors, which in combination can create a rather bulky design.
- Anaglyph glasses - multi-colored glasses, instead of lenses with CMY color filters inserted. A cheap, but quite effective method, physically it does not provide the correct transmission of color stereo images, but the nervous system interprets it quite well. The adaptation time is about 30 seconds, after prolonged use for a proportional period, color perception is impaired.
- Shutter stereo glasses. The image is projected on the screen for the left eye, then for the right. Accordingly, the glasses open the review to the left eye, then to the right. Used in 3D cinema format XpanD. Occasionally used in computer games, as they allow you to use a conventional CRT monitor (but with a powerful video card - the load on it doubles). Not every LCD is suitable - the true refresh rate for most of them does not exceed 30..75 Hz (meaning the actual time of rebuilding the LCD chains, and not the sweep frequency). An example of this technology is nVIDIA 3D Vision. To use 3D Vision, you need an LCD, plasma or OLED monitor with a scan frequency of 100 Hz or higher, a video card from nVIDIA with 3D Vision and special glasses. Starting from 2009-2010, the world began mass production of televisions operating on this principle. In April 2010, Russia began the conveyor production of Samsung 3D TVs in the Kaluga Region. The viewer puts on LCD glasses, which alternately (with a frequency of 60 Hz) darken the left and right eyes of a person, while the TV shows 120 images per second.
- Polarized stereo glasses.
Glasses themselves are somewhat more expensive than anaglyph glasses and require precision special equipment, in addition, the movie screen must be aluminized so that there is no depolarization of light. However (except for lowering the brightness and high cost) there are no pronounced shortcomings. Usually used in stereo cinemas. Having two similar projectors, a screen and a certain amount of polarizing film from a faulty LCD monitor, you can reproduce this stereo effect to a greater or lesser extent.
- - Based on linear polarization (cheaper, but with head tilts the stereo effect is lost). It is used in 3D-movie format IMAX 3D.
- - Based on circular polarization (more expensive). Used in 3D cinema format RealD Cinema.
- Stereo glasses with multi-band filters - provide a stereo effect due to the fact that lenses pass only narrow stripes of red, green and blue. Projection equipment is relatively cheap, but stereo glasses themselves are expensive. Used in 3D cinema format Dolby 3D.
- A stereoscope is an optical device with two eyepieces; It is usually used to view stereo slides, but it’s easy to attach a PDA or communicator with an elongated high-resolution screen (for example, Nokia E90).
- A stereo display is an optical instrument with which two planar images are combined in such a way that the observer gets the impression of a relief object.
- Virtual Helmet (VR HMD) - A helmet that displays separate images for each eye. The result is a stereo effect.
To view 3D data on a computer in stereo mode, you must use stereo drivers. The largest list of supported 3D-programs, games and stereo equipment have a stereo driver from NVidia. Currently, 3D photography has become an alternative to stereo photography, allowing you to get a truly three-dimensional image of the subject.
- An autostereogram is perceived by the observer without any external separating devices. The stereo pair is contained in a flat image in the form of alternating narrow vertical stripes of conjugate images. When considering autostereograms, you should look “through” the image so that the left and right eyes look at the strips intended for them.
- A hologram is an incorrect household name for an image coated on top with a microprism grid, due to which a purely mechanical separation of the image occurs - the left eye sees one half simply because it looks on the left, the right eye is similar. Large (and, accordingly, viewed from a considerable distance) images in this way cannot be obtained due to the reduction of such parallax.
Perception of volume can be obtained not only by simultaneously examining an object or image with two eyes at the same time, but also by changing the images quickly enough in one image channel (with monocular vision). So, GIF animation technology allows you to create pseudo stereoscopic 3D images (see photo at the beginning of the article).
A similar method has been proposed for “pseudo-stereo television” - by creating an anaglyphic image for moving, dynamic objects. Instead of viewing the image at the same time, the video signal is split into two color channels (usually red and blue, using appropriate glasses). The dynamic flat color monocular image is processed in such a way that a constant video signal is supplied to one eye (for example, the red channel), and a signal with a small time delay from the changed dynamic scene is supplied to the second (blue channel). Due to the movement of objects in the scene, the human brain receives a “three-dimensional image” (but only if the foreground objects are either displaced or rotated). The disadvantage of this method is the limited type of scene in which the stereo effect may occur, as well as a noticeable loss in the quality of the color image (each eye receives an almost monochromatic color image).
Another method of obtaining pseudo-stereo imaging is the use of nerve delays in the visual apparatus. The dark image is perceived by the eye somewhat slower than the light. If you squint one eye (or look through dark glass) - the “lagging” previous image in the video sequence overlaps with the current image perceived by the other eye. If the camera moves parallel to the plane of the frame (“shooting from the train window”), the “darkened” eye will perceive the video from its angle, and the second from a close point, which gives rise to an unexpectedly strong stereo effect. It has no practical application due to the limited possible angles, but it is easy to obtain experimentally - a mobile phone with a camera, an electric train and a squinted eye are enough.