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9913017 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | Some utilities for reading, writing, and color-coding .flo images Daniel Scharstein, 7/2/07 updated 2/9/08 to fix bug in color_flow.cpp updated 6/9/09 to make robust to NaN or constant 0 flow (thanks Jan Bouecke) See flowIO.cpp for sample code for reading and writing .flo files. Here's an excerpt from this file describing the flow file format: // ".flo" file format used for optical flow evaluation // // Stores 2-band float image for horizontal (u) and vertical (v) flow components. // Floats are stored in little-endian order. // A flow value is considered "unknown" if either |u| or |v| is greater than 1e9. // // bytes contents // // 0-3 tag: "PIEH" in ASCII, which in little endian happens to be the float 202021.25 // (just a sanity check that floats are represented correctly) // 4-7 width as an integer // 8-11 height as an integer // 12-end data (width*height*2*4 bytes total) // the float values for u and v, interleaved, in row order, i.e., // u[row0,col0], v[row0,col0], u[row0,col1], v[row0,col1], ... // Once you have a .flo file, you can create a color coding of it using color_flow Use colortest to visualize the encoding To compile cd imageLib make cd .. make ./colortest 10 colors.png |