1 / 8

Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller

Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller. Presented by Steven Scher sscher@ucsc.edu. Colorizing a ‘Target’ Greyscale Image by analogy to a ‘Source’ Color/Grey Image pair. Target. To Colorize This Greyscale Image …. Source.

suzuki
Download Presentation

Transferring Color to Greyscale Images Tomihisa Welsh, Michael Ashikhmin, Klaus Mueller

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

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

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

  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 • Colorize Swatches • Manually Defined Matching Regions Target Source (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/ This Paper is at 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/

  8. Faces Michael Ashikhmin Klaus Mueller Tomihisa Welsh ?

More Related