| Summary: | FILEIO : read header metadata from JPEG2000 files with Exiv2 | ||
|---|---|---|---|
| Product: | [Applications] digikam | Reporter: | Richard Ash <richard> |
| Component: | Plugin-DImg-JP2K | Assignee: | Digikam Developers <digikam-bugs-null> |
| Status: | RESOLVED FIXED | ||
| Severity: | normal | CC: | ahuggel, caulier.gilles, marcel.wiesweg, presse.wissen |
| Priority: | NOR | ||
| Version: | 0.10.0 | ||
| Target Milestone: | --- | ||
| Platform: | Gentoo Packages | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | 6.4.0 | |
|
Description
Richard Ash
2009-06-07 18:55:10 UTC
Try current implementation from svn, with First Run assistant. Gilles Caulier You seem to have debug message turned off when you say you have none. Enable 50003 in kdebugdialog. It is unusual to need so much time to scan an image. I think usually disk I/O is the limiting factor. You have already identified pictures possibly causing this. Please try to run the exiv2 command line utility on one of these and see if it takes long as well. Then please select one representative and provide them for testing. There may be a problem that we or Andreas from exiv2 can fix. If you have no upload space available you can send a picture to my mail account, I can upload it to our test image collection. Exactly the same issue exists in current SVN if I remove the digikam4.db file so that digikam thinks I have not run a KDE4 version before, and scans the whole collection. Note that under these conditions I don't get the first run dialogue, presumably because my digikamrc file still exists.
With debugging on (for digikam and kexiv2, although the latter isn't built from SVN and doesn't seem to do much), I get this output for each JPEG-2000 file scanned:
digikam(12860)/digikam (core) Digikam::DImg::load: "/home/ra/Documents/data/pictures/DVD3/2008-09-27-Band-Party/IMG_0490.jp2" : JPEG2000 file identified
digikam(12860)/KEXIV2 KExiv2Iface::KExiv2::getImageDateTime: DateTime => Exif.Photo.DateTimeOriginal => QDateTime("Sat Sep 27 20:31:10 2008")
digikam(12860)/KEXIV2 KExiv2Iface::KExiv2::getDigitizationDateTime: DateTime (Exif digitalized): Sat Sep 27 20:31:10 2008
digikam(12860)/KEXIV2 KExiv2Iface::KExiv2::getImageOrientation: Orientation => Exif.Image.Orientation => 1
The first message appears as soon as the image starts to be scanned, then there is a 12 second wait before the remaining lines appear, followed almost immediately by the first line for the next image. During this time the CPU is at 100% but there is no disk I/O, so this is not a problem with the time it takes to read the image from disk.
I have uploaded IMG_0490.jp2 to
http://richardash1981.users.sourceforge.net/IMG_0490.jp2
unfortunately it's a 15MB image (separate moan about this when I work out why).
Running exiv2 from the command line on this image is not slow:
----
$ time exiv2 IMG_0490.jp2
File name : IMG_0490.jp2
File size : 14789616 Bytes
MIME type : image/jp2
Image size : 2856 x 4290
Camera make : Canon
Camera model : Canon EOS 450D
Image timestamp : 2008:09:27 20:31:10
Image number :
Exposure time : 1/3 s
Aperture : F4
Exposure bias : 0
Flash : No, compulsory
Flash bias : 0 EV
Focal length : 23.0 mm
Subject distance: 0
ISO speed : 800
Exposure mode : Aperture priority
Metering mode : Multi-segment
Macro mode : Off
Image quality : RAW
Exif Resolution : 2856 x 4290
White balance : Auto
Thumbnail : image/jpeg, 3234 Bytes
Copyright :
Exif comment :
real 0m0.017s
user 0m0.010s
sys 0m0.002s
----
Oddly, identify from ImageMagick is very slow:
----
$ time identify IMG_0490.jp2
IMG_0490.jp2 JP2 2856x4290 2856x4290+0+0 16-bit DirectClass 14.1mb 15.290u 0:21
real 0m20.136s
user 0m14.546s
sys 0m0.753s
----
which probably isn't relevant.
I then tried renaming my digikamrc file and all databases out of the way, so I get a clean first run of the new SVN build. Selected as pictures folder the folder I normally us, i.e. /home/ra/Documents/data/pictures/. After accepting the defaults on all subsequent screens (except I chose to do corrections on opening raw files, because I'm curious), it goes into the scan process on the folder tree, with the same results - when scanning JPEG files (sizes 1MB - 6MB) it scans so fast I can't read the text scrolling past, when it reaches JPEG-2000 it slows down to one image every 10 seconds with full CPU and almost no disk I/O.
Marcel, Why parsing JPEG2000 file is too slow ? I can reproduce it here too ? Typically, parsing JP2 with Exiv2 must be fast (i suppose that scanning from DB use Exiv2.... I hope). No need to decode whole image. Also, in DImg::JP2KLoader, i can see rule to loader JP2 header to get image informations without to load full image... So, I'm a little bit confuse here... Gilles Marcel, Why DImg JPEG2000 image loader is used at first run : digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/2-RGBA-test-8bits.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/3-RGBA_test-16bits.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/3-RGBA_test-16bits.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/7-16bits+alpha-photo.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/7-16bits+alpha-photo.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/grayscale.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/grayscale.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/IMG_2924_cap_one-0.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/IMG_2924_cap_one-0.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/index256.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/index256.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/Otoe_Relief8.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/Otoe_Relief8.jp2" digikam(18787)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/photo-dimage-0.jp2" : JPEG2000 file identified digikam(18787)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/photo-dimage-0.jp2" ... And take a while to parse images ... Gilles Caulier Marcel, After to place some debug messages to JPEG2000 loader: digikam(19367) Digikam::JP2KLoader::load: Init JPEG2000 API digikam(19367) Digikam::JP2KLoader::load: Check JPEG2000 Color space digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 geometry digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 depth digikam(19367)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/grayscale.jp2" digikam(19367)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/IMG_2924_cap_one-0.jp2" : JPEG2000 file identified digikam(19367) Digikam::JP2KLoader::load: Init JPEG2000 API digikam(19367) Digikam::JP2KLoader::load: Check JPEG2000 Color space digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 geometry digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 depth digikam(19367)/digikam (core) Digikam::ImageScanner::addImage: Adding new item "/mnt/data/photos/Albums/Test Pictures/JPEG2000/IMG_2924_cap_one-0.jp2" digikam(19367)/digikam (core) Digikam::DImg::load: "/mnt/data/photos/Albums/Test Pictures/JPEG2000/index256.jp2" : JPEG2000 file identified digikam(19367) Digikam::JP2KLoader::load: Init JPEG2000 API digikam(19367) Digikam::JP2KLoader::load: Check JPEG2000 Color space digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 geometry digikam(19367) Digikam::JP2KLoader::load: Scan JPEG2000 depth ... I can see that Init JPEG 2000 API take a while... If i contunue my investiguations, i can see : digikam(19606) Digikam::JP2KLoader::load: Init JPEG2000 API digikam(19606) Digikam::JP2KLoader::load: Init JPEG2000 API: open stream digikam(19606) Digikam::JP2KLoader::load: Init JPEG2000 API: decode digikam(19606) Digikam::JP2KLoader::load: Init JPEG2000 API: close stream ... that Init JPEG2000 API: decode is the problem... here : http://lxr.kde.org/source/extragear/graphics/digikam/libs/dimg/loaders/jp2kloader.cpp#120 Gilles It seems the whole image is decoded? The idea is that if LoadImageData is not set, only infos about image size and colorspace is extracted by reading the file header. With libjpeg, libpng, libtiff this is possible without decoding the whole image. It's usually very fast, I assume the file header is read by exiv2 anyway so no further disk access. I dont find the API docs for libjasper anyway, but is this not possible with this library? Marcel, It sound like it's not possible with Jasper (weird) Look in tool jasper code, there is a command line to see JP2 file properties. It use decode function too... Image Magick use also this function with identify image. Anyway, the ultimate solution is to always use Exiv2 to scan image: this will decrease start up time... Currently, Exiv2 can only get 2 common image properties outside Exif, Iptc, and Xmp : image width and image height. Andreas as planed to add more properties as color depth, color space, compression ratio, etc... when it's available (depending of file format of course). Andreas, please fix me if i'm wrong here... Gilles We read currently read width, height, color space and color depth from the information by the image loaders, and use DImg to calculate the file hash. (I have a callgrind profile here that I took when importing pictures. This profile gives me headaches (some methods take 186% of the time??), but DImg::load for JPEGs only takes 0.29%. This is CPU, without disk access, but I assume, as exiv2 will read the file anyway, it is in the OS's disk access cache and disk reading is no limiting factor.) To fix the profile at hand, I think, we must return from the jp2k loader's code early if LoadImageData is not set. For color space and bit depth, if it cannot be retrieved, we must return (wrong) standard values. It is currently not possible to get this information from exiv2 as I understand. Btw, I think there is the same problem in the QImage loader. > Andreas as planed to add more properties as > color depth, color space, compression ratio, etc... when it's available > (depending of file format of course). You're referring to http://dev.exiv2.org/issues/show/505 I presume. It is still quite a long way until we get there. Exiv2 typically only reads what it needs (metadata only, no image data). I had a quick look at the code to read JP2 images just now, there might be potential for improvement if Exiv2 parsing is slow. Andreas Andreas, No, as Marcel said, in digiKam we use internal image loaders to get image informations outside XMP, Exif, IPTC. We don't use Exiv2 yet for this task. This is why digiKam >= 0.10.0 is slow at first run. There is no optimization to do in Exiv2 to parse JP2. Using Exiv2 at this place will speed up first run. Gilles Caulier SVN commit 1059937 by mwiesweg: Disable scanning of images with libjasper. This means that width, height, and color format will not be available. At least width and height are available from exiv2, but Image::pixelWidth() and pixelHeight() are not used in libkexiv2. So for now, the dimensions are only avaiable for when there is Exif information. CCBUG: 215458 CCBUG: 195583 M +17 -0 jp2kloader.cpp WebSVN link: http://websvn.kde.org/?view=rev&revision=1059937 *** Bug 215458 has been marked as a duplicate of this bug. *** Copying from 215458: ------- Comment #3 From Marcel Wiesweg 2009-11-27 18:16:08 (-) [reply] ------- Gilles, part of the problem is that we load the full JPEG200 image when scanning, because libjasper does not support just reading the header. My proposed short-term solution is to _not_ load the whole image, instead do not scan color format and rely on exiv2 to retrieve width and height for JPEG2k images. Long term we should evaluate OpenJPEG, I dont know about the status of this project, but I read Krita's Cyrille Berger is developing a loader based on this library. ------- Comment #4 From Gilles Caulier 2009-11-27 18:22:34 (-) [reply] ------- I'm agree to not load full JP2 image during scanning. OpenJPEG is not the only way to solve this problem. In Exiv2 a future new image info container will be created to get physical informations about the image JP2 is already supported by Exiv2. I know... I have writen this image format support (:=))) Another very important information about Exiv2 is the availablity of image width and height info. These properties can be already extracted using Exiv2 (look Exiv2::Image method). Libkexiv2 must be adapted as well. It's simple to do... About OpenJPEG, i know that libray is lesser fast than Jasper, but tlike this last one sound like unmainted, OpenJPEG must be the right way to use for the far future... Richard, This file still valid with 2.x serie ? Gilles Caulier I rename this file title and point to relevant source code future change : https://projects.kde.org/projects/extragear/graphics/digikam/repository/revisions/master/entry/libs/dimg/loaders/jp2kloader.cpp#L100 Gilles Caulier Exiv2 support JPEG2000 metadata since a while. I close this file now. Gilles Caulier |