o:imop.vl_imup;'>VL_IMUP</a></b> Upsample an image by two</li><li><b><a href='%pathto:imop.vl_imwbackward;'>VL_IMWBACKWARD</a></b> Image backward warping</li><li><b><a href='%pathto:imop.vl_imwhiten;'>VL_IMWHITEN</a></b> Whiten image</li><li><b><a href='%pathto:imop.vl_rgb2xyz;'>VL_RGB2XYZ</a></b> Convert RGB color space to XYZ</li><li><b><a href='%pathto:imop.vl_tps;'>VL_TPS</a></b> Compute the thin-plate spline basis</li><li><b><a href='%pathto:imop.vl_tpsu;'>VL_TPSU</a></b> Compute the U matrix of a thin