Stereo Vision

An anaglyph is an image made up of two color layers mainly red and cyan which is observed by

the use of a particular type of colored red/cyan glass.

Colored RED/CYAN glass

The red filter blocks the blue/green components of the anaglyph image, sothe left eye sees only the red image formed from the left image.

Similarly the blue/green filter blocks the red component of the anaglyph andthus the right eye sees only the blue/green component formed from the rightimage

Types of Anaglyph

True

Anaglyph

Gray

Anaglyph

Color

Anaglyph

Half Color

Anaglyph

Dark Image Not Dark Image Not Dark Image Not Dark Image

No Colorreproduction

No Color reproduction Partinal Colorreproduction

Partial Colorreproduction

Little ghosting More ghosting then true anaglyph

Retinal rivalry Less retinal rivalry than color anaglyphs.

Generation of Anaglyph Image

Firstly we need to calibrate the two cameras by encapsulating thegeometrical relationship between positions for the two cameras.

Rectification of the pair of images where we get a image which have norotation in them.

Finally generate the anaglyph image by encoding the left and right rectifiedimages using red and cyan filters and merging them into a single picture.

Flow Chart

Left Rectified Image

STEREO CAMERA

Left Raw Image Right Raw Image

Right Rectified Image

Select Red Channel Select Blue/Green Channel

Merges these two Channels = Multichannel

Images

Anaglyph Image

Calibration

Rectification

Calibration

Rectification

Experimental result:

The figure shows the raw image:

Experimental result:

The figure shows the rectified image:

Experimental Result

The figure shows the generated Color anaglyph image:

Experimental Result

The figure shows the generated Color anaglyph image:

Experimental Result

The figure shows the generated Half Color anaglyph image:

Experimental Result

The figure shows the generated True anaglyph image:

Advantages of anaglyph image

Anybody with normal vision can see 3D in anaglyph.

Red-cyan stereoscopic glasses are common and cheap.

A singe digital projector can show anaglyphs on a screen for alarge audience, who see three dimensions through the same,cheap, coloured glasses used for computer or print viewing.

Disadvantages

Ghosting : Major problem of anaglyph image is ghosting effect where each eye perceives the view of other eye. It is due to the type of glasses used or due to the display used.

Retinal rivalry : If the brightness of the two image is not the same in each eye the effect is unpleasant.