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Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller Presented by Steven Scher

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Presentation on theme: "Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller Presented by Steven Scher"— Presentation transcript:

1 Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller Presented by Steven Scher sscher@ucsc.edu

2 Colorizing a ‘Target’ Greyscale Image by analogy to a ‘Source’ Color/Grey Image pair To Colorize This Greyscale Image … Use a known Greyscale/Color Image Pair Target Source

3 For each pixel in Target Image, Find Matching Pixel in Greyscale Source Image Find a pixel in the Greyscale Source Image with a similar: (1) brightness (2) Standard Deviation of Neighborhood Brightnesses Measure Similarity with Euclidian Distance Speed-Up: Instead of Searching Entire Source Image (millions of pixels), only search a Randomly-Chosen Subset of ~200 pixels. Jittered Sampling: (1) Divide Image into a grid (2) Randomly (Uniformly) choose one pixel from each grid

4 Give same color to Greyscale Target pixel as Best-Matched Source Image Pixel If this Greyscale Target Pixel is matched by this Greyscale Source Pixel … Then choose the color of the same pixel in the Color Source Image

5 Difficult Cases – Use Swatches Source Target (1)Colorize Swatches Manually Defined Matching Regions (2) Result is New Source Pair Different Similarity Metric now used: Sum over neighborhood of pixel-by- pixel differences

6 Movies One Source Image Pair can be used to colorize an entire movie Swatches on one video frame can be used to create the Source Image Pair

7 Links Author’s website –http://www.cs.sunysb.edu/~tfwelsh/colorize/http://www.cs.sunysb.edu/~tfwelsh/colorize/ –This Paper is at http://www.cs.sunysb.edu/~tfwelsh/colorize/colorize-sig02.pdf http://www.cs.sunysb.edu/~tfwelsh/colorize/colorize-sig02.pdf Image Analogies Paper –(framework for this type of algorithm) –http://mrl.nyu.edu/projects/image-analogies/http://mrl.nyu.edu/projects/image-analogies/

8 Faces Michael Ashikhmin Klaus Mueller Tomihisa Welsh ?

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