Stereo pictures (> 127 pieces)
Stereo image is a picture or video series that uses two separate images to achieve stereo effect. To create a stereo image in a three-dimensional modeling program, it is necessary to do a double rendering of the scene - from two cameras that correspond to the observer's eyes.
How to watch stereo pictures
Various devices and methods are used to create and view stereo images. Looking simple, harder to learn. And on the monitor will turn out not worse than on paper! But when printing with poor quality or a large increase visible errors printer ie. the picture is not visible ...
- Approaching almost tight to the monitor (~ 5 cm. To the screen).
- We relax eyes and do not try to focus.
- Meeeeeely head back (~ 15-20 cm from the screen).
- If you "caught" the focus during the "departure", then we return to item 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 that the image should remain as if outside the picture.
All stereo pictures were successfully tested by me! They work! If you can't "see", try another!
Not everything is easy to see, for some you need a lot of strength and patience ... And I do not advise you to get involved! Nothing happens with overvoltage.
PS At the bottom of the page you can download all the images in one archive.
- The method of parallel gaze allows you to see the full-color stereo image without any equipment, the stereo effect is achieved by reducing the eyes beyond the image plane. The method is only suitable for viewing relatively small images of 60–70 mm each, which is due to the interpupillary distance of a person. "Liberty" with the image scaling method also does not allow.
- The cross-eye method is similar to the previous one, but the eyes are reduced in front of the image (“on the nose”). The previous method, in which the eyes look as if beyond the image, is preferable, because it causes less eye strain. On the one hand, the cross-pair can be of arbitrary size and arbitrarily scaled when viewed, on the other hand, the 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 image separation (mirror split) allows you to do without eyestrain, using a mirror to separate the field of view. The stereo picture for this method also, like the previous one, is left and right frames, only one of them is flipped. The mirror is placed perpendicular to the face, close to the nose, and perpendicular to the same picture, in the place where the left and right frames are separated. Usually the left frame is mirrored relative to the true position of the object. In this case, you need to look with both eyes to the right: the right eye looks at the right picture, the left through the mirror - at the left. Smoothly adjusting the mirror, you need to combine the image so that there is a stereo effect. The advantage of this method is that using only the materials at hand, 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. For large images, wide mirrors are needed, which in combination can create a rather cumbersome design.
- Anaglyph glasses are multi-colored glasses, instead of lenses in which CMY color filters are inserted. Cheap, but quite an effective method, physically, it does not ensure the correct transmission of color stereo image, 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 disturbed.
- Shutter stereo glasses. The image for the left eye, then for the right one is projected on the screen. Accordingly, the glasses open the review to the left eye, then to the right. Used in 3D movie format XpanD. Occasionally they are used in computer games, as they allow the use of a conventional CRT monitor (but with a powerful video card - the load on it doubles). LCD monitor is not suitable for everyone - 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 frequency of the sweep). An example of such a technology is nVIDIA 3D Vision. To use 3D Vision you need a LCD, plasma or OLED monitor with a 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 television sets that work on this principle. In April 2010, the conveyor production of Samsung 3D TVs in the Kaluga Region began in Russia. The viewer puts on the LCD glasses, which alternately (at 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.
The glasses themselves are somewhat more expensive than anaglyph glasses and require precision special equipment; in addition, the projection screen must be aluminized so that there is no light depolarization. However (except for lowering the brightness and high cost) there are no pronounced drawbacks. Usually used in stereo cinema. 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 degree.
- - Based on linear polarization (cheaper, but when the head is tilted, the stereo effect is lost). Used in 3D cinema format IMAX 3D.
- - Based on circular polarization (more expensive). It is used in 3D-cinema format RealD Cinema.
- Stereo glasses with multi-band filters - provide a stereo effect due to the fact that lenses allow only narrow bands of red, green and blue to pass through. Projection equipment is relatively cheap, but the stereo glasses themselves are expensive. Used in Dolby 3D cinema.
- Stereoscope - optical device with two eyepieces; It is usually used for viewing stereo slides, but it is not difficult to put a PDA or a communicator with an oblong high-resolution screen (for example, Nokia E90).
- 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.
- A virtual helmet (VR HMD) is a helmet that shows individual images for each eye. The result is a stereo effect.
To view three-dimensional data on a computer in stereo mode, you need to use stereo drivers. The largest list of supported 3D programs, games and stereo equipment is provided by NVidia's stereo drivers. At present, 3D photography has become an alternative to stereo photography, which allows us to obtain a truly three-dimensional image of the subject.
- Autostereogram is perceived by the observer without any external separation devices. The stereo pair is contained in a flat image in the form of alternating narrow vertical strips of conjugate images. When viewing autostereograms, one should look “through” the image so that the left and right eyes look at the bars intended for them.
- A hologram is an incorrect household name for an image, covered on top with a microprism grating, due to which a purely mechanical separation of the image takes place - the left eye sees one half simply because it looks to the left, the right eye - similarly. Large (and, accordingly, viewed from a considerable distance) images in this way cannot be obtained due to the reduction of such parallax.
The 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 fairly quickly changing images in one image channel (with monocular vision). Thus, the technology of GIF-animation allows you to create pseudostereoscopic three-dimensional images (see photo at the beginning of the article).
A similar method is proposed for “pseudo stereo television” - by creating an anaglyph image for moving, dynamic objects. Instead of simultaneously viewing the image, the video signal is split into two color channels (usually red and blue, with the use of appropriate glasses). A dynamic flat color monocular image is processed in such a way that a constant video signal is fed to one eye (for example, a red channel), and a second time signal is sent to the second (blue channel) signal from a changed dynamic scene. 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 scenes in which stereo effects can occur, as well as a noticeable loss of color image quality (each eye receives an almost monochromatic color image).
Another method of obtaining a pseudo stereo image is the use of nerve delays in the visual apparatus. The dark image is perceived by the eye somewhat slower than the bright one. If you pinch one eye (or look through dark glass) - the “lagging” previous image of the video sequence is superimposed on the current image perceived by the other eye. If the camera moves parallel to the frame plane (“shooting from the train window”), the “darkened” eye will perceive the video sequence from its perspective, and the second from a close point, which creates an unexpectedly strong stereo effect. It has no practical application due to the limited possible angles, but is easy in experimental acquisition - a mobile phone with a camera, an electric train and a squint of the eye are enough.