Transferring Color to Greyscale Images

Transferring Color to Greyscale Images

Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller (Stony Brook University) SIGGRAPH2002 What is Colorization?

Woody Allen: "colorization" of films "is a `monstrous,' disgusting,' horrible,' `sinful,' `absurd,' `humiliating,' `preposterous,' and `insulting' mutilation and defacing of genuine works of art, in which computers are used to `doctor' and `tamper' with the `great originals,' thereby

creating `degraded,' `cheesy,' artificial symbols of one society's greed." What can it do? Colorize old movies Make black and white pictures color Adds a dimension to MRIs or airport luggage

scans Lifelike electron microscope scans Why is it difficult? Grayscale images consist of one dimensional data Luminance data

No Saturation or Hue 3D HSL colors have 256x256 or ~66,000 colors with a given Luminance Its still not easy

Different sections of an image might have same lumination but very different hue.

But lets give it a shot We need a color space HSL and RGB just wont cut it Domo Arigato Mr. Ruderman et. Al. 1998 Created l, a, B color space Decorellated space

Linearly independent Luminance ( l )

Yellow-blue ( a ) Red-Green ( B ) Come again? Conversion: LMS = Long, medium, and short wavelength Now that we have our new color space, we turn

to some sadisI mean statistics Scale and correct l, a, and B RGB to LAB Luminance Mapping

Source image = color image Target image = grayscale image Luminance Mapping part Deux Hertzmann et. Al. 2001 Standard deviation of 5x5 pixel neighborhood Match source and target based on combination of

luminance (50%) and std. dev. (50%) Map the match Map it Source Luminance Channel Target

Remapped Houston There is a problem with this. What if there are different sections of the picture?

Swatches Indicate similar parts of a scene

Examples More Examples Video

Why not extend this to video? Industry born in 1970 (Wilson Markle)

Recolorized movies use these techniques Source frame used every camera change Once have first target, use that as source User-defined swatches can track movement Waves

Horses This is your brain At what cost? In 1987 $3,000/min or $300,000/movie

One Critic calls it the Bastardization of film Brings in on average $500,000/release Oh, Cool Wrap-Up

Get source and target

Convert colors to l, a, B Map colors Use swatches for faster better results Process takes between 15 seconds and 4 minutes on Pentium III 900 MHz CPU Use MATLAB

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