Search

This paper proposes a recoloring algorithm that when applied to images and videos, recolors them such that the color vision deficient users are able to see things that they previously couldn't. We compare the performances of two other prominent recoloring algorithms and prove how the proposed contrast enhancement color compensation technique is the most efficacious. Our previous paper [7] discusses color blindness, its causes and effects, the research that had been done previously on mitigating it, their outcomes and the various approaches adopted by some of the eminent researchers in this field. Color blindness is the inability of its victim to differentiate between the objects whose colors lie in a specific range of wavelengths, specific for each and every type of color blindness. Its three types are monochromacy, dichromacy and trichromacy. Our work focuses on anomalous trichromacy (especially on deuteranomaly and tritanomaly). While there is no medical cure for it yet, defective vision can be assuaged by certain techniques which many researchers have come up with. The merits and demerits of the various author's approaches were discussed in our previous [5] publication. Most of the research work that had been done never accounted for videos. We implement the previously invented algorithms on videos as well, thereby making a significant breakthrough. Apart from that, we propose a novel recoloring algorithm that is also applicable on both.

Color Blindness which can be also referred as Color Vision Deficiency (CVD) is one of the biggest scaling defect in humans which is still under the research for its accurate detection and cure measures & strategies. Color Blindness is the decreased ability to sight the distinctive colors instantly under normal lighting conditions. There are approximately 250 million individuals who suffer from Color Blindness. So it is need of an hour to understand all the important aspects of the Problem CVD and take the necessary measures to help the People who are knowingly or unknowingly suffering from CVD. In this paper we are going to put light on how exactly color blindness is genetically transferred to children, types in color vision deficiency i.e. Anomalous Trichromacy (protanomaly, deuteranomaly, tritanomaly), Monochromacy and how exactly person sees the normal image under respective CVD and finally put light on few algorithms and strategies which with the help of re-coloring and wavelength shifting actually help the color vision deficient to view and sight all the colors of the actual image distinctively.

In the Human eye there are two types of image receptor cells cones and rods. Rods are helpful for seeing the image in low light or in the dark whereas the cones work for seeing the image in different colours. Both the receptors cells are found in retina of human eye. They contain three colour pigments Red (Large Bandwidth), Green (Medium Bandwidth) and Blue (Small Bandwidth) by which we are trichromats (tri =3 chromats =colour) and able to see any object in the world because of all objects are viewable by these colour hues. Mostly the colour blindness is the genetic mutation and not to be cured. It can also get place when there is a problem related to pigments in certain nerve cells (cone) of the eye or when there would be a trauma in mind or the chemical accident by which those receptor cells got affect. In the Human vision there are different stages which describe what type of colour vision deficiency the people have. Monochromacy (1%): Total colour blinded Dichromacy (10%): Partial colour blinded (i) red-green colour blindness (ii) blue-yellow colour blindness. Trichromacy: Normal colour vision. The Dichromacy, this type of colour blindness mostly people have. So correcting it, a new filter is developed in the image processing on the basis of Ishihara colour test. It works successfully as per tested it many time. In this filter adjusting, contrast stretching and inverting function are used for providing better result and it does. By applying this new filter the normal and as well colour vision deficient people easily recognise the objects whether they are of any of shape, number or alphabets.

Colour blindness is a genetic mutation that alters the colour vision of the subjects by decreasing the sensitivity to certain colour wavelengths, depending on the defect. There are many forms of colour blindness ranging from monochromacy (black-white) to the most common form, the “red-green” variation where reds or greens are weakened, the vibrant shades are easily seen and the dull shades are difficult to perceive. A filter was designed based on the Ishihara colour tests in order to correct the colour blind deficiencies. This was successful for seeing the hidden objects within the test plates but did not translate well for real world images. The filter was modified, removing the dullest/lightest shades and shifting all the shades to the darker vibrant shades. The original image was shown to colour blind and normal vision subjects with results varying among all the subjects. After the modified filter was applied to a natural image, the colour blind and normal vision subjects were all able to correctly identify the test colours.