HUMAN SIGHT AND HEARING

Human Sight and Hearing Enabling Broadcasting

Human Sight and Hearing

Eye / Brain Combination

To understand how we see, we must recall the various parts and functions of the human eye and, in particular, the basis of monochrome and colour vision. However, we can not take his eyes in isolation - the only difference between red and green wavelengths is very high two-wave frequencies. Sensation of colour is produced in the brain and the physical properties of light. Surprisingly, perhaps, the images obtained on the retina of the eye: - upside down - from left to right: - curved, not flat - blur, except for a tiny area, suitably small coin held at a distance of two meters. The image moves rapidly across the retina each time we move your head or turn our eyes. In addition, our eyes will not allow both near and far objects to be made sharp at the same time.

Monochrome Vision

Photosensitive layer of the human eye consists of millions of very few receptors known as rods and cones. Generally speaking, the rods are dominant in low light conditions (such as moonlight, starlight) and give us a monochromatic vision.

Colour Vision

Cones in the photosensitive layer of the eye can see colours. Nerve cross connections between mosaic elements pass in front of the retina, and thus the optic nerve has a good punch of retina to reach the brain. In this case, the optic nerve produces a "blind spot" in our vision, not far from the direct line of visibility. Our pupils expand and contract to control the intensity of the image, but can only offer a 20:01 ratio control.

Thus, a colour TV, for this reason, the contribution of the blue signal is the sum of the luminance signal to 10%. When account is taken of the fact that all the blue lights are influenced not only by the blue-absorbing pigments and green and red pigments absorb, it turns out that the contribution to the luminosity of the blue-absorbing pigment on its own only about 1%. Thus the luminosity signal based mainly on redand green-absorbing pigment, can provide better resolution of fine detail than is based equally on all three. This effect is compounded by the fact that the blue pigment is well separated on the scale of the wavelength of the green pigment, while the red and green pigments are fairly close to each other. One can ...