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init.lua
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init.lua
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----------------------------------------------------------------------
--
-- Copyright (c) 2011 Ronan Collobert, Clement Farabet
--
-- Permission is hereby granted, free of charge, to any person obtaining
-- a copy of this software and associated documentation files (the
-- "Software"), to deal in the Software without restriction, including
-- without limitation the rights to use, copy, modify, merge, publish,
-- distribute, sublicense, and/or sell copies of the Software, and to
-- permit persons to whom the Software is furnished to do so, subject to
-- the following conditions:
--
-- The above copyright notice and this permission notice shall be
-- included in all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
-- NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
-- LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
-- OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
-- WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--
----------------------------------------------------------------------
-- description:
-- image - an image toolBox, for Torch
--
-- history:
-- July 1, 2011, 7:42PM - import from Torch5 - Clement Farabet
----------------------------------------------------------------------
require 'torch'
require 'sys'
require 'xlua'
require 'dok'
require 'libimage'
----------------------------------------------------------------------
-- types lookups
--
local type2tensor = {
float = torch.FloatTensor(),
double = torch.DoubleTensor(),
byte = torch.ByteTensor(),
}
local template = function(type)
if type then
return type2tensor[type]
else
return torch.Tensor()
end
end
----------------------------------------------------------------------
-- save/load in multiple formats
--
-- depth convertion helper
local function todepth(img, depth)
if depth and depth == 1 then
if img:nDimension() == 2 then
-- all good
elseif img:size(1) == 3 or img:size(1) == 4 then
img = image.rgb2y(img:narrow(1,1,3))[1]
elseif img:size(1) == 2 then
img = img:narrow(1,1,1)
elseif img:size(1) ~= 1 then
dok.error('image loaded has wrong #channels', 'image.todepth')
end
elseif depth and depth == 3 then
if img:nDimension() == 2 then
local imgrgb = img.new(3, img:size(1), img:size(2))
imgrgb:select(1, 1):copy(img)
imgrgb:select(1, 2):copy(img)
imgrgb:select(1, 3):copy(img)
img = imgrgb
elseif img:size(1) == 3 then
-- all good
elseif img:size(1) == 4 then
img = img:narrow(1,1,3)
elseif img:size(1) == 1 then
local imgrgb = img.new(3, img:size(2), img:size(3))
imgrgb:select(1, 1):copy(img)
imgrgb:select(1, 2):copy(img)
imgrgb:select(1, 3):copy(img)
img = imgrgb
else
dok.error('image loaded has wrong #channels', 'image.todepth')
end
end
return img
end
local function loadPNG(filename, depth, tensortype)
if not xlua.require 'libpng' then
dok.error('libpng package not found, please install libpng','image.loadPNG')
end
local MAXVAL = 255
local a = template(tensortype).libpng.load(filename)
if tensortype ~= 'byte' then
a:mul(1/MAXVAL)
end
a = todepth(a, depth)
return a
end
rawset(image, 'loadPNG', loadPNG)
local function savePNG(filename, tensor)
if not xlua.require 'libpng' then
dok.error('libpng package not found, please install libpng','image.savePNG')
end
local MAXVAL = 255
local a = torch.Tensor():resize(tensor:size()):copy(tensor)
a.image.saturate(a) -- bound btwn 0 and 1
a:mul(MAXVAL) -- remap to [0..255]
a.libpng.save(filename, a)
end
rawset(image, 'savePNG', savePNG)
function image.getPNGsize(filename)
if not xlua.require 'libpng' then
dok.error('libpng package not found, please install libpng','image.getPNGsize')
end
return torch.Tensor().libpng.size(filename)
end
local function processJPG(img, depth, tensortype)
local MAXVAL = 255
if tensortype ~= 'byte' then
img:mul(1/MAXVAL)
end
img = todepth(img, depth)
return img
end
local function loadJPG(filename, depth, tensortype)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg','image.loadJPG')
end
local load_from_file = 1
local a = template(tensortype).libjpeg.load(load_from_file, filename)
if a == nil then
return nil
else
return processJPG(a, depth, tensortype)
end
end
rawset(image, 'loadJPG', loadJPG)
local function decompressJPG(tensor, depth, tensortype)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg',
'image.decompressJPG')
end
if torch.typename(tensor) ~= 'torch.ByteTensor' then
dok.error('Input tensor (with compressed jpeg) must be a byte tensor',
'image.decompressJPG')
end
local load_from_file = 0
local a = template(tensortype).libjpeg.load(load_from_file, tensor)
if a == nil then
return nil
else
return processJPG(a, depth, tensortype)
end
end
rawset(image, 'decompressJPG', decompressJPG)
local function saveJPG(filename, tensor)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg','image.saveJPG')
end
local MAXVAL = 255
local a = torch.Tensor():resize(tensor:size()):copy(tensor)
a.image.saturate(a) -- bound btwn 0 and 1
a:mul(MAXVAL) -- remap to [0..255]
local save_to_file = 1
local quality = 75
a.libjpeg.save(filename, a, save_to_file, quality)
end
rawset(image, 'saveJPG', saveJPG)
function image.getJPGsize(filename)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg','image.getJPGsize')
end
return torch.Tensor().libjpeg.size(filename)
end
local function compressJPG(tensor, quality)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg',
'image.compressJPG')
end
local MAXVAL = 255
local a = torch.Tensor():resize(tensor:size()):copy(tensor)
a.image.saturate(a) -- bound btwn 0 and 1
a:mul(MAXVAL) -- remap to [0..255]
local b = torch.ByteTensor()
local save_to_file = 0
quality = quality or 75
a.libjpeg.save("", a, save_to_file, quality, b)
return b
end
rawset(image, 'compressJPG', compressJPG)
function image.getJPGsize(filename)
if not xlua.require 'libjpeg' then
dok.error('libjpeg package not found, please install libjpeg','image.getJPGsize')
end
return torch.Tensor().libjpeg.size(filename)
end
local function loadPPM(filename, depth, tensortype)
require 'libppm'
local MAXVAL = 255
local a = template(tensortype).libppm.load(filename)
if tensortype ~= 'byte' then
a:mul(1/MAXVAL)
end
a = todepth(a, depth)
return a
end
rawset(image, 'loadPPM', loadPPM)
local function savePPM(filename, tensor)
require 'libppm'
if tensor:nDimension() ~= 3 or tensor:size(1) ~= 3 then
dok.error('can only save 3xHxW images as PPM', 'image.savePPM')
end
local MAXVAL = 255
local a = torch.Tensor():resize(tensor:size()):copy(tensor)
a.image.saturate(a) -- bound btwn 0 and 1
a:mul(MAXVAL) -- remap to [0..255]
a.libppm.save(filename, a)
end
rawset(image, 'savePPM', savePPM)
local function savePGM(filename, tensor)
require 'libppm'
if tensor:nDimension() == 3 and tensor:size(1) ~= 1 then
dok.error('can only save 1xHxW or HxW images as PGM', 'image.savePGM')
end
local MAXVAL = 255
local a = torch.Tensor():resize(tensor:size()):copy(tensor)
a.image.saturate(a) -- bound btwn 0 and 1
a:mul(MAXVAL) -- remap to [0..255]
a.libppm.save(filename, a)
end
rawset(image, 'savePGM', savePGM)
local filetypes = {
jpg = {loader = image.loadJPG, saver = image.saveJPG},
png = {loader = image.loadPNG, saver = image.savePNG},
ppm = {loader = image.loadPPM, saver = image.savePPM},
-- yes, loadPPM not loadPGM
pgm = {loader = image.loadPPM, saver = image.savePGM}
}
filetypes['JPG'] = filetypes['jpg']
filetypes['JPEG'] = filetypes['jpg']
filetypes['jpeg'] = filetypes['jpg']
filetypes['PNG'] = filetypes['png']
filetypes['PPM'] = filetypes['ppm']
filetypes['PGM'] = filetypes['pgm']
rawset(image, 'supported_filetypes', filetypes)
local function is_supported(suffix)
return filetypes[suffix] ~= nil
end
rawset(image, 'is_supported', is_supported)
local function load(filename, depth, tensortype)
if not filename then
print(dok.usage('image.load',
'loads an image into a torch.Tensor', nil,
{type='string', help='path to file', req=true},
{type='number', help='force destination depth: 1 | 3'},
{type='string', help='type: byte | float | double'}))
dok.error('missing file name', 'image.load')
end
local ext = string.match(filename,'%.(%a+)$')
local tensor
if image.is_supported(ext) then
tensor = filetypes[ext].loader(filename, depth, tensortype)
else
dok.error('unknown image type: ' .. ext, 'image.load')
end
return tensor
end
rawset(image, 'load', load)
local function save(filename, tensor)
if not filename or not tensor then
print(dok.usage('image.save',
'saves a torch.Tensor to a disk', nil,
{type='string', help='path to file', req=true},
{type='torch.Tensor', help='tensor to save (NxHxW, N = 1 | 3)'}))
dok.error('missing file name | tensor to save', 'image.save')
end
local ext = string.match(filename,'%.(%a+)$')
if image.is_supported(ext) then
tensor = filetypes[ext].saver(filename, tensor)
else
dok.error('unknown image type: ' .. ext, 'image.save')
end
end
rawset(image, 'save', save)
----------------------------------------------------------------------
-- crop
--
local function crop(...)
local dst,src,startx,starty,endx,endy
local args = {...}
if select('#',...) == 6 then
dst = args[1]
src = args[2]
startx = args[3]
starty = args[4]
endx = args[5]
endy = args[6]
elseif select('#',...) == 5 then
src = args[1]
startx = args[2]
starty = args[3]
endx = args[4]
endy = args[5]
elseif select('#',...) == 4 then
dst = args[1]
src = args[2]
startx = args[3]
starty = args[4]
elseif select('#',...) == 3 then
src = args[1]
startx = args[2]
starty = args[3]
else
print(dok.usage('image.crop',
'crop an image', nil,
{type='torch.Tensor', help='input image', req=true},
{type='number', help='start x', req=true},
{type='number', help='start y', req=true},
{type='number', help='end x'},
{type='number', help='end y'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='number', help='start x', req=true},
{type='number', help='start y', req=true},
{type='number', help='end x'},
{type='number', help='end y'}))
dok.error('incorrect arguments', 'image.crop')
end
if endx==nil then
return src.image.cropNoScale(src,dst,startx,starty)
else
local depth=1
local x
if src:nDimension() > 2 then
x = src.new(src:size(1),endy-starty,endx-startx)
else
x = src.new(endy-starty,endx-startx)
end
src.image.cropNoScale(src,x,startx,starty)
dst = dst or src.new():resizeAs(x)
image.scale(dst,x)
end
return dst
end
rawset(image, 'crop', crop)
----------------------------------------------------------------------
-- translate
--
local function translate(...)
local dst,src,x,y
local args = {...}
if select('#',...) == 4 then
dst = args[1]
src = args[2]
x = args[3]
y = args[4]
elseif select('#',...) == 3 then
src = args[1]
x = args[2]
y = args[3]
else
print(dok.usage('image.translate',
'translate an image', nil,
{type='torch.Tensor', help='input image', req=true},
{type='number', help='horizontal translation', req=true},
{type='number', help='vertical translation', req=true},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='number', help='horizontal translation', req=true},
{type='number', help='vertical translation', req=true}))
dok.error('incorrect arguments', 'image.translate')
end
dst = dst or src.new()
dst:resizeAs(src)
dst:zero()
src.image.translate(src,dst,x,y)
return dst
end
rawset(image, 'translate', translate)
----------------------------------------------------------------------
-- scale
--
local function scale(...)
local dst,src,width,height,mode,size
local args = {...}
if select('#',...) == 4 then
src = args[1]
width = args[2]
height = args[3]
mode = args[4]
elseif select('#',...) == 3 then
if type(args[3]) == 'string' then
if type(args[2]) == 'string' or type(args[2]) == 'number' then
src = args[1]
size = args[2]
mode = args[3]
else
dst = args[1]
src = args[2]
mode = args[3]
end
else
src = args[1]
width = args[2]
height = args[3]
end
elseif select('#',...) == 2 then
if type(args[2]) == 'string' or type(args[2]) == 'number' then
src = args[1]
size = args[2]
else
dst = args[1]
src = args[2]
end
else
print(dok.usage('image.scale',
'rescale an image (geometry)', nil,
{type='torch.Tensor', help='input image', req=true},
{type='number', help='destination width', req=true},
{type='number', help='destination height', req=true},
{type='string', help='mode: bilinear | simple', default='bilinear'},
'',
{type='torch.Tensor', help='input image', req=true},
{type='string | number', help='destination size: "WxH" or "MAX" or "^MIN" or MAX', req=true},
{type='string', help='mode: bilinear | simple', default='bilinear'},
'',
{type='torch.Tensor', help='destination image', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='string', help='mode: bilinear | simple', default='bilinear'}))
dok.error('incorrect arguments', 'image.scale')
end
if size then
local iwidth,iheight
if src:nDimension() == 3 then
iwidth,iheight = src:size(3),src:size(2)
else
iwidth,iheight = src:size(2),src:size(1)
end
local imax = math.max(iwidth,iheight)
local omax = tonumber(size)
if omax then
height = iheight / imax * omax
width = iwidth / imax * omax
else
width,height = size:gfind('(%d*)x(%d*)')()
if not width or not height then
local imin = math.min(iwidth,iheight)
local omin = size:gfind('%^(%d*)')()
if omin then
height = iheight / imin * omin
width = iwidth / imin * omin
end
end
end
end
if not dst and (not width or not height) then
dok.error('could not find valid dest size', 'image.scale')
end
if not dst then
if src:nDimension() == 3 then
dst = src.new(src:size(1), height, width)
else
dst = src.new(height, width)
end
end
mode = mode or 'bilinear'
if mode=='bilinear' then
src.image.scaleBilinear(src,dst)
elseif mode=='simple' then
src.image.scaleSimple(src,dst)
else
dok.error('mode must be one of: simple | bilinear', 'image.scale')
end
return dst
end
rawset(image, 'scale', scale)
----------------------------------------------------------------------
-- rotate
--
local function rotate(...)
local dst,src,theta, mode
local args = {...}
if select('#',...) == 4 then
dst = args[1]
src = args[2]
theta = args[3]
mode = args[4]
elseif select('#',...) == 3 then
if type(args[2]) == 'number' then
src = args[1]
theta = args[2]
mode = args[3]
else
dst = args[1]
src = args[2]
theta = args[3]
end
elseif select('#',...) == 2 then
src = args[1]
theta = args[2]
else
print(dok.usage('image.rotate',
'rotate an image by theta radians', nil,
{type='torch.Tensor', help='input image', req=true},
{type='number', help='rotation angle (in radians)', req=true},
{type='string', help='mode: simple | bilinear', default='simple'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='number', help='rotation angle (in radians)', req=true},
{type='string', help='mode: simple | bilinear', default='simple'}))
dok.error('incorrect arguments', 'image.rotate')
end
dst = dst or src.new()
dst:resizeAs(src)
mode = mode or 'simple'
if mode == 'simple' then
src.image.rotate(src,dst,theta)
elseif mode == 'bilinear' then
src.image.rotateBilinear(src,dst,theta)
else
dok.error('mode must be one of: simple | bilinear', 'image.rotate')
end
return dst
end
rawset(image, 'rotate', rotate)
----------------------------------------------------------------------
-- polar
--
local function polar(...)
local dst,src,interp,mode
local args = {...}
if select('#',...) == 4 then
dst = args[1]
src = args[2]
interp = args[3]
mode = args[4]
elseif select('#',...) == 3 then
if type(args[2]) == 'string' then
src = args[1]
interp = args[2]
mode = args[3]
else
dst = args[1]
src = args[2]
interp = args[3]
end
elseif select('#',...) == 2 then
if type(args[2]) == 'string' then
src = args[1]
interp = args[2]
else
dst = args[1]
src = args[2]
end
elseif select('#',...) == 1 then
src = args[1]
else
print(dok.usage('image.polar',
'convert an image to polar coordinates', nil,
{type='torch.Tensor', help='input image', req=true},
{type='string', help='interpolation: simple | bilinear', default='simple'},
{type='string', help='mode: valid | full', default='valid'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='string', help='interpolation: simple | bilinear', default='simple'},
{type='string', help='mode: valid | full', default='valid'}))
dok.error('incorrect arguments', 'image.polar')
end
interp = interp or 'valid'
mode = mode or 'simple'
if dst == nil then
local maxDist = math.floor(math.max(src:size(2), src:size(3)))
dst = src.new()
dst:resize(src:size(1), maxDist, maxDist)
end
if interp == 'simple' then
if mode == 'full' then
src.image.polar(src,dst,1)
elseif mode == 'valid' then
src.image.polar(src,dst,0)
else
dok.error('mode must be one of: valid | full', 'image.polar')
end
elseif interp == 'bilinear' then
if mode == 'full' then
src.image.polarBilinear(src,dst,1)
elseif mode == 'valid' then
src.image.polarBilinear(src,dst,0)
else
dok.error('mode must be one of: valid | full', 'image.polar')
end
else
dok.error('interpolation must be one of: simple | bilinear', 'image.polar')
end
return dst
end
rawset(image, 'polar', polar)
----------------------------------------------------------------------
-- logpolar
--
local function logpolar(...)
local dst,src,interp,mode
local args = {...}
if select('#',...) == 4 then
dst = args[1]
src = args[2]
interp = args[3]
mode = args[4]
elseif select('#',...) == 3 then
if type(args[2]) == 'string' then
src = args[1]
interp = args[2]
mode = args[3]
else
dst = args[1]
src = args[2]
interp = args[3]
end
elseif select('#',...) == 2 then
if type(args[2]) == 'string' then
src = args[1]
interp = args[2]
else
dst = args[1]
src = args[2]
end
elseif select('#',...) == 1 then
src = args[1]
else
print(dok.usage('image.logpolar',
'convert an image to log-polar coordinates', nil,
{type='torch.Tensor', help='input image', req=true},
{type='string', help='interpolation: simple | bilinear', default='simple'},
{type='string', help='mode: valid | full', default='valid'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='string', help='interpolation: simple | bilinear', default='simple'},
{type='string', help='mode: valid | full', default='valid'}))
dok.error('incorrect arguments', 'image.polar')
end
interp = interp or 'valid'
mode = mode or 'simple'
if dst == nil then
local maxDist = math.floor(math.max(src:size(2), src:size(3)))
dst = src.new()
dst:resize(src:size(1), maxDist, maxDist)
end
if interp == 'simple' then
if mode == 'full' then
src.image.logPolar(src,dst,1)
elseif mode == 'valid' then
src.image.logPolar(src,dst,0)
else
dok.error('mode must be one of: valid | full', 'image.logpolar')
end
elseif interp == 'bilinear' then
if mode == 'full' then
src.image.logPolarBilinear(src,dst,1)
elseif mode == 'valid' then
src.image.logPolarBilinear(src,dst,0)
else
dok.error('mode must be one of: valid | full', 'image.logpolar')
end
else
dok.error('interpolation must be one of: simple | bilinear', 'image.logpolar')
end
return dst
end
rawset(image, 'logpolar', logpolar)
----------------------------------------------------------------------
-- warp
--
local function warp(...)
local dst,src,field
local mode = 'bilinear'
local offset_mode = true
local clamp_mode = 'clamp'
local args = {...}
local nargs = select('#',...)
local bad_args = false
if nargs == 2 then
src = args[1]
field = args[2]
elseif nargs >= 3 then
if type(args[3]) == 'string' then
-- No destination tensor
src = args[1]
field = args[2]
mode = args[3]
if nargs >= 4 then offset_mode = args[4] end
if nargs >= 5 then clamp_mode = args[5] end
if nargs >= 6 then bad_args = true end
else
-- With Destination tensor
dst = args[1]
src = args[2]
field = args[3]
if nargs >= 4 then mode = args[4] end
if nargs >= 5 then offset_mode = args[5] end
if nargs >= 6 then clamp_mode = args[6] end
if nargs >= 7 then bad_args = true end
end
end
if bad_args then
print(dok.usage('image.warp',
'warp an image, according to a flow field', nil,
{type='torch.Tensor', help='input image (KxHxW)', req=true},
{type='torch.Tensor', help='(y,x) flow field (2xHxW)', req=true},
{type='string', help='mode: lanczos | bicubic | bilinear | simple', default='bilinear'},
{type='string', help='offset mode (add (x,y) to flow field)', default=true},
{type='string', help='clamp mode: how to handle interp of samples off the input image (clamp | pad)', default='clamp'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image (KxHxW)', req=true},
{type='torch.Tensor', help='(y,x) flow field (2xHxW)', req=true},
{type='string', help='mode: lanczos | bicubic | bilinear | simple', default='bilinear'},
{type='string', help='offset mode (add (x,y) to flow field)', default=true},
{type='string', help='clamp mode: how to handle interp of samples off the input image (clamp | pad)', default='clamp'}))
dok.error('incorrect arguments', 'image.warp')
end
-- This is a little messy, but convert mode string to an enum
if (mode == 'simple') then
mode = 0
elseif (mode == 'bilinear') then
mode = 1
elseif (mode == 'bicubic') then
mode = 2
elseif (mode == 'lanczos') then
mode = 3
else
dok.error('Incorrect arguments (mode is not lanczos | bicubic | bilinear | simple)!', 'image.warp')
end
if (clamp_mode == 'clamp') then
clamp_mode = 0
elseif (clamp_mode == 'pad') then
clamp_mode = 1
else
dok.error('Incorrect arguments (clamp_mode is not clamp | pad)!', 'image.warp')
end
local dim2 = false
if src:nDimension() == 2 then
dim2 = true
src = src:reshape(1,src:size(1),src:size(2))
end
dst = dst or src.new()
dst:resize(src:size(1), field:size(2), field:size(3))
src.image.warp(dst, src, field, mode, offset_mode, clamp_mode)
if dim2 then
dst = dst[1]
end
return dst
end
rawset(image, 'warp', warp)
----------------------------------------------------------------------
-- hflip
--
local function hflip(...)
local dst,src
local args = {...}
if select('#',...) == 2 then
dst = args[1]
src = args[2]
elseif select('#',...) == 1 then
src = args[1]
else
print(dok.usage('image.hflip',
'flips an image horizontally (left/right)', nil,
{type='torch.Tensor', help='input image', req=true},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true}))
dok.error('incorrect arguments', 'image.hflip')
end
dst = dst or src.new()
local original_size = src:size()
if src:nDimension() == 2 then
src = src:new():resize(1,src:size(1),src:size(2))
end
dst:resizeAs(src)
dst.image.hflip(dst, src)
dst:resize(original_size)
return dst
end
rawset(image, 'hflip', hflip)
----------------------------------------------------------------------
-- vflip
--
local function vflip(...)
local dst,src
local args = {...}
if select('#',...) == 2 then
dst = args[1]
src = args[2]
elseif select('#',...) == 1 then
src = args[1]
else
print(dok.usage('image.vflip',
'flips an image vertically (upside-down)', nil,
{type='torch.Tensor', help='input image', req=true},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true}))
dok.error('incorrect arguments', 'image.vflip')
end
dst = dst or src.new()
local original_size = src:size()
if src:nDimension() == 2 then
src = src:new():resize(1,src:size(1),src:size(2))
end
dst:resizeAs(src)
dst.image.vflip(dst, src)
dst:resize(original_size)
return dst
end
rawset(image, 'vflip', vflip)
----------------------------------------------------------------------
-- convolve(dst,src,ker,type)
-- convolve(dst,src,ker)
-- dst = convolve(src,ker,type)
-- dst = convolve(src,ker)
--
local function convolve(...)
local dst,src,kernel,mode
local args = {...}
if select('#',...) == 4 then
dst = args[1]
src = args[2]
kernel = args[3]
mode = args[4]
elseif select('#',...) == 3 then
if type(args[3]) == 'string' then
src = args[1]
kernel = args[2]
mode = args[3]
else
dst = args[1]
src = args[2]
kernel = args[3]
end
elseif select('#',...) == 2 then
src = args[1]
kernel = args[2]
else
print(dok.usage('image.convolve',
'convolves an input image with a kernel, returns the result', nil,
{type='torch.Tensor', help='input image', req=true},
{type='torch.Tensor', help='kernel', req=true},
{type='string', help='type: full | valid | same', default='valid'},
'',
{type='torch.Tensor', help='destination', req=true},
{type='torch.Tensor', help='input image', req=true},
{type='torch.Tensor', help='kernel', req=true},
{type='string', help='type: full | valid | same', default='valid'}))
dok.error('incorrect arguments', 'image.convolve')
end
if mode and mode ~= 'valid' and mode ~= 'full' and mode ~= 'same' then
dok.error('mode has to be one of: full | valid | same', 'image.convolve')
end
local md = (((mode == 'full') or (mode == 'same')) and 'F') or 'V'
if kernel:nDimension() == 2 and src:nDimension() == 3 then
local k3d = src.new(src:size(1), kernel:size(1), kernel:size(2))
for i = 1,src:size(1) do
k3d[i]:copy(kernel)
end
kernel = k3d
end
if dst then
torch.conv2(dst,src,kernel,md)
else
dst = torch.conv2(src,kernel,md)
end
if mode == 'same' then
local cx = dst:dim()
local cy = cx-1
local ofy = math.ceil(kernel:size(cy)/2)
local ofx = math.ceil(kernel:size(cx)/2)
dst = dst:narrow(cy, ofy, src:size(cy)):narrow(cx, ofx, src:size(cx))
end
return dst
end
rawset(image, 'convolve', convolve)
----------------------------------------------------------------------
-- compresses an image between min and max
--
local function minmax(args)
local tensor = args.tensor
local min = args.min
local max = args.max
local symm = args.symm or false
local inplace = args.inplace or false
local saturate = args.saturate or false
local tensorOut = args.tensorOut or (inplace and tensor)
or torch.Tensor(tensor:size()):copy(tensor)
-- resize
if args.tensorOut then
tensorOut:resize(tensor:size()):copy(tensor)
end
-- saturate useless if min/max inferred
if min == nil and max == nil then
saturate = false
end
-- rescale min
local fmin = 0
if (min == nil) then
if args.symm then
fmin = math.max(math.abs(tensorOut:min()),math.abs(tensorOut:max()))
min = -fmin
else
min = tensorOut:min()
end
end
if (min ~= 0) then tensorOut:add(-min) end
-- rescale for max
if (max == nil) then
if args.symm then
max = fmin*2
else
max = tensorOut:max()
end
else
max = max - min
end
if (max ~= 0) then tensorOut:div(max) end
-- saturate
if saturate then
tensorOut.image.saturate(tensorOut)
end
-- and return
return tensorOut
end
rawset(image, 'minmax', minmax)
local function toDisplayTensor(...)
-- usage
local _, input, padding, nrow, scaleeach, min, max, symm, saturate = dok.unpack(
{...},
'image.toDisplayTensor',
'given a pack of tensors, returns a single tensor that contains a grid of all in the pack',
{arg='input',type='torch.Tensor | table', help='input (HxW or KxHxW or Kx3xHxW or list)',req=true},
{arg='padding', type='number', help='number of padding pixels between images', default=0},
{arg='nrow',type='number',help='number of images per row', default=6},
{arg='scaleeach', type='boolean', help='individual scaling for list of images', default=false},
{arg='min', type='number', help='lower-bound for range'},
{arg='max', type='number', help='upper-bound for range'},
{arg='symmetric',type='boolean',help='if on, images will be displayed using a symmetric dynamic range, useful for drawing filters', default=false},
{arg='saturate', type='boolean', help='saturate (useful when min/max are lower than actual min/max', default=true}
)
local packed = torch.Tensor()
if type(input) == 'table' then
-- pack images in single tensor