Let us have some after lunch fun

Fast Image and VideoFast Image and Video CCoolloorriizzaattiioonn (and beyond) (and beyond) using using

Chrominance BlendingChrominance BlendingYatziv and S.Yatziv and S.

Hand-Tinting of PhotosHand-Tinting of Photos1919thth century century

Hand-Tinting of postcardsHand-Tinting of postcardsearly 20early 20thth century century

Computer Assisted Colorization

• Given: a single dimension of luminance

• Output: three dimensions– Luminance– Chrominance

• Colorization is ambiguous in nature and requires some amount of human interaction.

Commercial Software

Adobe Photoshop Tutorial

Computer Assisted Colorization InterfacesComputer Assisted Colorization Interfaces

• Sample Based– One or more color images as a source– In video, use one or more colored frames

sample frame gray-scale result colored image

Example source: Sykora, Burianek, Zara “Colorization of Black-and-White Cartoons”

Computer Assisted Colorization InterfacesComputer Assisted Colorization Interfaces

• Chrominance Scribble Based– Small chrominance markings– Scribble area << image size

gray-scale scribbles result colored image

Example source: Levin, Lischinski, Weiss, “Colorization using optimization,” SIGGRAPH’ 04

Previous WorkPrevious Work

• Luminance Keying– Gonzalez, Woods, ‘Digital Image Processing’.

– Welsh, Ashikhmin, Mueller, “Transferring color to grayscale images”.

– Reinhard, Ashikhmin, Gooch, Shirley, “Color transfer between images”.

– Hertzmann, Jacobs, Oliver, Curless, Salesin, “Image analogies”.

• Segmentation– Chen, Wang, Schillings, Meinel, “Gray-scale matting and colorization”.

– Sykora, Burianek, Zara “Colorization of Black-and-White Cartoons”.

• Geometry Based– Sapiro, “Inpainting the colors”.

– Levin, Lischinski, Weiss, “Colorization using optimization”

Our ApproachOur Approach

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Fast Image and Video Colorization using Chrominance BlendingFast Image and Video Colorization using Chrominance Blending

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dc(t) can be calculated efficiently using improved “Fast Marching” algorithm.

……Our ApproachOur Approach

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Fast Image and Video Colorization using Chrominance BlendingFast Image and Video Colorization using Chrominance Blending

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Shepard interpolation

Examples

Examples

Example - Video

NEAR

FAR

DECOLORIZING

                                             

Video Inpainting

Patwardhan and S.

Tracking under severe occlusions

Bartesaghi and S.