311 lines
6.8 KiB
Plaintext
311 lines
6.8 KiB
Plaintext
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- look at
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There is an order 1 algorithm for doing medians over boxes (truly O(1)
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per pixel: I checked it carefully; it's like doing means over boxes in
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order 1 per pixel) in OpenCV since February 2012 I think, due to
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Perreault (and Hebert).
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It appears to be well respected, at least for 8-bit medians. Very
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memory intensive. Simple and elegant. No clue if it fits VIPS well
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(probably not?).
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Article: nomis80.org/ctmf.pdf
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- quadratic doesn't work for order 3
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start to get jaggies on lines --- the 3rd differential isn't being
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initialised correctly for the sub-region?
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seems fine vertically, only get errors on horizontal tile boundaries
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because we step across tiles left to right: y doesn't change, only x does
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- seems to leak with vips_check_matrix()?
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- test with interpolators, do we add margins correctly?
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- the operation cache needs to detect invalidate
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tricky!
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perhaps have operations always watching all of their inputs and resignalling
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"invalidate" themselves
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cache then just needs to watch for "invalidate" on operations it tracks
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need to add an "invalidate" signal to operation
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- check CMC equations against web
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http://en.wikipedia.org/wiki/Color_difference#CMC_l:c_.281984.29
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- see
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http://www.dentistry.bham.ac.uk/landinig/software/cdeconv/cdeconv.html
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sounds useful for BM?
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blocking bugs
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=============
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- none!
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mosaic
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======
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- balance should use new meta stuff
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- histogram balance option?
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resample
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========
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- check mosaic1, global_balance, similarity etc. use of im__affine
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how can we move them to im_affinei ?
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- perspective transform with a matrix ... base it on the Lenz transformer, but
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partial
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foreign
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=======
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- magick2vips should spot ICC profiles and attach them as meta
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- interlaced jpg needs massive memory, we should have two jpg read modes, like
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png
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- add more sequential mode readers
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$ grep -l write_line *.c
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csv.c
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matlab.c
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openexr2vips.c
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ppm.c
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radiance.c
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- foreign docs come up as "VipsForeignSave", annoying, why?
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- add nifti support
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http://niftilib.sourceforge.net/
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- support planar tiff
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- add matlab write
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- im_exr2vips can now use c++ api
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see TODO notes in openexr read (though they all need more openexr C API)
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consider openexr write
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- magick should set some header field for n_frames and frame_height? see also
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analyze
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- im_csv2vips() could use "-" for filename to mean stdin
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but then we'd have to read to a malloced buffer of some sort rather than an
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image, since we might need to grow it during the read, since we couldn't
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then seek
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packaging
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=========
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- test _O_TEMPORARY thing on Windows
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- do we bundle "convert" in the OS X / win32 builds? if we don't we
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should
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convolution
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===========
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- revisit orc conv
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use an 8.8 accumulator ... build the scale into the 8.8 coeffs ... no div at
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the end, just a shift
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need 8 x 8.8 -> 8.8 for each coeff though
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- im_conv()/im_morph() could have more than 10 programs? try 20 and see if we
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still have a speedup
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make a base class for vector area operations with a matrix with three vfuncs
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for init / generate code for one element / end and a gslist of programs, use
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that as the base for morph and conv
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wait for vipsobject for this
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arithmetic
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==========
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- avg/dev etc. should uncode images? eg. labq2lab etc.
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how about ifthenelse?
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- bandalike: consider RGB + RGBA ... we should bandup by adding a black band
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(or white?? unclear)
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not clear if this is a good idea ... eg. when we upband a 1 band to a 2
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band, should we duplicate the 1 band or add black?
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- HAVE_HYPOT could define a hypot() macro?
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- fix a better NaN policy
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should we not generate images containing NaN (eg. divide tries to avoid /0),
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or should vips_max() etc. try to avoid NaN in images (eg. vips_max() takes a
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lot a care to skip NaN, though vips_stats() does not)?
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iofuncs
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=======
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- we have VipsArrayObject and also vips_object_local_array()
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can we make one use the other?
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- need vips_image_invalidate_area()
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- look at libpeas for plugin support
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http://live.gnome.org/Libpeas
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- how about
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vips max add[babe.jpg,babe2.jpg]
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does that make any sense?
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vips copy add[babe.jpg,add[babe2.jpg,babe3.jpg]] sum.v
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perhaps use curly brackets for code?
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vips max add{babe.jpg,babe2.jpg}
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no brackets or square brackets for options
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- transform_g_string_array_image() can't handle quoted strings, so filenames
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with spaces will break
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is there an easy fix? can we reuse code from the csv parser?
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the csv parser just parses FILE* streams, we'd need to break it out
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- note member free stuff in vipsobject docs
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should boxed get freed in finalise rather than dispose?
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vipsobject has few docs atm :(
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- vips_object_set_argument_from_string() needs more arg types
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must be some way to make this more automatic
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- generate the code for vips_add() etc. automatically? it might be
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nice to have them all in one place at least
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- what does G_UNLIKELY() do? can we use it?
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- look into G_GNUC_DEPRECATED for back compat in vips8
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- should im_rwcheck() copy to disc?
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maybe im_rwcheck_disc() copies to im->filename and maps that
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rather awkward to do atm with the way check.c is structured
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swig
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====
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- swig is not wrapping im_project() correctly ... returns an extra VImage via
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a param
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- doc strings would be nice, read the SWIG notes on this
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new bindings
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============
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- new binding is still missing constants
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how do boxed types work? confusing
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we need to be able to make a VipsArrayDouble
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- Vips.Image has members like chain, __subclasshook__ etc etc, are we
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really subclassing it correctly?
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- add __add__ etc overloads
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freq_filt
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=========
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- fft with odd width or height is broken ... DC ends up in the wrong place
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libvipsCC
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=========
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- need new C++ API
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- need an im_init_world() for C++ which does cmd-line args too, so C++ progs
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can get --vips-progress and stuff automatically
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tools
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=====
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- could spot "copy" and turn on seq mode automatically?
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perhaps there should be something on operations to indicate seq-ability
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- need a way to make the vips.1 etc. man pages
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gtk has things like docs/reference/gtk/gtk-update-icon-cache.xml and man
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pages are made from that with xslt
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- get rid of a lot of the command-line programs, who wants to write a man page
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for batch_image_convert etc yuk
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- can we make man pages for the API as well? probably not from googling a bit
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- rename header, edvips as vipsheader, vipsedit
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maybe have back compat links?
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new operations
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==============
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- bilateral filtering, see:
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http://en.wikipedia.org/wiki/Bilateral_filter
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http://www.shellandslate.com/fastmedian.html
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http://people.csail.mit.edu/sparis/bf_course/
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also a mail from Martin Breidt has links to several fast free C
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implementations
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- http://en.wikipedia.org/wiki/Otsu%27s_method
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- non-linear sharpen: replace each pixel by the lightest or darkest neighbour
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depending on which is closer in value
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