I am trying to convert a dicom file to JPG which I would then use to show as thumbnail for the dicom file. I am using the code below to convert the dicom file but When I execute it I get the following error
'write': no encode delegate for this image format `' # error/constitute.c/WriteImage/1272 (Magick::ImageMagickError)
I am using ruby version 2.7.0 and I have installed ImageMagick 7.1.0-4 and the supportive gems. How to solve this error?
require 'dicom'
require 'rmagick'
include DICOM
dcm = DObject.read("sample.dcm")
image = dcm.image(:frame => 5)
image.normalize.write("test.jpeg");
I had to reinstall ImageMagick-7.1.0-26 along with libgdcm-tools on my system and the above mentioned code worked fine. So Imagemagick needs these additional libraries (libjpeg62-dev, libtiff-dev, libpng-dev, libpng12-0 and libgdcm-tools) to work with these image types. I don't know if this is correct or not but that the problem I was facing has been resolved by following this approach. Here are some of the links which helped me in solving this
Install ImageMagick with JPG TIFF and PNG Delegates
How to configure and build with libgcdm for lossless jpeg conversion
and dicom support
from kivy.uix.image import Image
self.img = Image(source="image") # This works when image is an PNG image
self.img = Image(source="image.jpg") # This works when image.jpg is a JPG image
self.img = Image(source="image") # This doesn't work when image is a JPG image
I need to specify images without extention for the app to be generic (working with more image types). Can I achieve it somehow?
Kivy is using "imghdr" to determine the image type here, and as a fallback it uses the file extension here.
That explains why the image loads fine when it has a file extension, even though "imghdr" can't find the file type in the file's content.
I tested on a list of JPEG files, and each time "imghdr" was able to detect the file type each time. That is done here im imghdr. Notably, "imghdr" does not consider the file extension.
$ python
>>> import os, imghdr
... for f in os.listdir('.'):
... print('%s -- %s' % (f, imghdr.what(f)))
Maybe the JPEG file is missing the "JFIF" or "Exif" string that imghdr is looking for? You could use hexedit to see if one of those string is present at Byte 6 of the image file.
I am using ImageMagick to convert a gif to multiple png data. But I get this error:
convert: improper image header
/misc/lmbraid11/jingl/webscraping/dataset_2018_05_18/image2018_5_4_10_34.gif'
# error/gif.c/ReadGIFImage/1037. convert: no images defined
/misc/lmbraid11/jingl/webscraping/dataset_2018_05_18/image2018_5_4_10_34.png'
# error/convert.c/ConvertImageCommand/3210.
Here is the command:
convert -coalesce /misc/lmbraid11/jingl/webscraping/dataset_2018_05_18/image2018_5_4_10_34.gif /misc/lmbraid11/jingl/webscraping/dataset_2018_05_18/image2018_5_4_10_34.png
The gif file was downloaded from:
[http://www.niederschlagsradar.de/image.ashx?type=regioloop®io=fre][1]
ImageMagick version: Version: ImageMagick 6.8.9-9 Q16 x86_64
Any help will be appreciated.
Problem get solved. It turns out that I did not download the gif file correctly, so the gif file was corrupted.
The syntax should be:
convert image2018_5_4_10_34.gif -coalesce image2018_5_4_10_34.png
In your case, you're specifying the option before files, however it can vary on your IM version.
As per #fmw42 comment:
Note that proper ImageMagick syntax reads the input before the -coalesce. Though ImageMagick 6 is forgiving, ImageMagick 7 is not.
I would like to read/write XMP metadata in JPEG and PNG files.
I'm able to do this using the exiftool
~ $ exiftool -xmp-dc:description="FooBar" sample.png
1 image files updated
~ $ exiftool sample.png | grep "Description"
Description : FooBar
However, I'm not able to read the XMP Metadata using imagemagick
~ $ identify -verbose sample.png | grep "Description"
My reason to write XMP metadata is that so it can be read by Adobe Products.
Question
Is there a way to read/write XMP metadata using imagemagick?
What you want to ask is "does ImageMagick support reading or writing XMP (descriptive) metadata?". The answer to that question, from reading the documentation, is no. ImageMagick reads (almost) all metadata from a file, but not descriptive metadata.
If for some reason you must use ImageMagick to extract XMP metadata, you could try to include a filter. Filters can be configured to process image files, but they are not part of ImageMagick itself.
convert -ping yourimage.jpg XMP:-
Access XMP data can be done as follows:
ImageMagick.XmpProfile xmp = image.GetXmpProfile();
Console.WriteLine("\n\n----> xmp:" + xmp);
if (xmp != null)
{
you have to process the XML data of the XMPs result.
ie. use XPATH or some other XML interface.
}
OpenCV says something like
Corrupt JPEG data: premature end of data segment
or
Corrupt JPEG data: bad Huffman code
or
Corrupt JPEG data: 22 extraneous bytes before marker 0xd9
when loading a corrupt jpeg image with imread().
Can I somehow catch that? Why would I get this information otherwise?
Do I have to check the binary file on my own?
OpenCV (version 2.4) does not overwrite the basic error handling for libjpeg, making them 'uncatchable'. Add the following method to modules/highgui/src/grfmt_jpeg.cpp, right below the definition of error_exit():
METHODDEF(void)
output_message( j_common_ptr cinfo )
{
char buffer[JMSG_LENGTH_MAX];
/* Create the message */
(*cinfo->err->format_message) (cinfo, buffer);
/* Default OpenCV error handling instead of print */
CV_Error(CV_StsError, buffer);
}
Now apply the method to the decoder error handler:
state->cinfo.err = jpeg_std_error(&state->jerr.pub);
state->jerr.pub.error_exit = error_exit;
state->jerr.pub.output_message = output_message; /* Add this line */
Apply the method to the encoder error handler as well:
cinfo.err = jpeg_std_error(&jerr.pub);
jerr.pub.error_exit = error_exit;
jerr.pub.output_message = output_message; /* Add this line */
Recompile and install OpenCV as usual. From now on you should be able to catch libjpeg errors like any other OpenCV error. Example:
>>> cv2.imread("/var/opencv/bad_image.jpg")
OpenCV Error: Unspecified error (Corrupt JPEG data: 1137 extraneous bytes before marker 0xc4) in output_message, file /var/opencv/opencv-2.4.9/modules/highgui/src/grfmt_jpeg.cpp, line 180
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
cv2.error: /var/opencv/opencv-2.4.9/modules/highgui/src/grfmt_jpeg.cpp:180: error: (-2) Corrupt JPEG data: 1137 extraneous bytes before marker 0xc4 in function output_message
(I've submitted a pull request for the above but it got rejected because it would cause issues with people reading images without exception catching.)
Hope this helps anyone still struggling with this issue. Good luck.
It could be easier to fix the error in the file instead of trying to repair the loading function of OpenCV. If you are using Linux you can use ImageMagick to make reparation to a set of images (is usual to have it installed by default):
$ mogrify -set comment 'Image rewritten with ImageMagick' *.jpg
This command changes a property of the file leaving the image data untouched. However, the image is loaded and resaved, eliminating the extra information that causes the corruption error.
If you need more information about ImageMagick you can visit their website: http://www.imagemagick.org/script/index.php
You cannot catch it if you use imread(). However there is imdecode() function that is called by imread(). Maybe it gives you more feedback. For this you would have to load the image into memory on your own and then call the decoder.
It boils down to: You have to dig through the OpenCV sources to solve your problem.
i had to deal with this recently and found a solution over here
http://artax.karlin.mff.cuni.cz/~isa_j1am/other/opencv/
i just need to make 2 edits # $cv\modules\highgui\src\grfmt_jpeg.cpp.
--- opencv-1.0.0.orig/otherlibs/highgui/grfmt_jpeg.cpp 2006-10-16 13:02:49.000000000 +0200
+++ opencv-1.0.0/otherlibs/highgui/grfmt_jpeg.cpp 2007-08-11 09:10:28.000000000 +0200
## -181,7 +181,7 ##
m_height = cinfo->image_height;
m_iscolor = cinfo->num_components > 1;
- result = true;
+ result = (cinfo->err->num_warnings == 0);
}
}
## -405,8 +405,9 ##
icvCvt_CMYK2Gray_8u_C4C1R( buffer[0], 0, data, 0, cvSize(m_width,1) );
}
}
- result = true;
+
jpeg_finish_decompress( cinfo );
+ result = (cinfo->err->num_warnings == 0);
}
}
I am using opencv python package to read some image and also met this error message. This error can not be catch by Python. But if you want to find which image is corrupted without recompiling opencv as #Robbert suggested, you can try the following method.
First, you can pinpoint the directory where the corrupt images reside, which is fairly easy. Then you go to the directory, and use mogrify command line tool provided by ImageMagick to change the image meta info, as suggest by #goe.
mogrify -set comment "errors fixed in meta info" -format png *.jpg
The above command will convert the original jpg image to png format and also clean the original image to remove errors in meta info. When you run mogrify command, it will also output some message about which image is corrupted in the directory so that you can accurately find the corrupted image.
After that, you can do whatever you want with the original corrupted jpg image.
Any one stumbles upon this post and reads this answer.
I had to get hold of a corrupted image file.
These websites can help you corrupt your file
Corrupt a file - The file corrupter you were looking for!
CORRUPT A FILE ONLINE
Corrupt my File
First and the third website was not that much useful.
Second website is interesting as I could set the amount of file that I need to corrupt.
OpenCV version I used here is 3.4.0
I used normal cv2.imread(fileLocation)
fileLocation Location of corrupted image file
OpenCV didn't show any error message for any of the corrupted files used here
First and Third website only gave one file and both had None stored in them, when I tried to print them
Second website did let me decide the amount of file that was needed to be corrupted
Corruption% Opencv message on printing the image
4% None
10% None
25% None
50% None Corrupt JPEG data: 3 extraneous bytes before marker 0x4f
75% None Corrupt JPEG data: 153 extraneous bytes before marker 0xb2
100% Corrupt JPEG data: 330 extraneous bytes before marker 0xc6 None
I guess the only check we have to make here would be
if image is not None:
Do your code or else pop an error
You can redirect stderr to a file, then after imread, search for the string "Huffman" inside that file. After searching the file, empty it. It works for me and now I am able to discard corrupted images and just process good ones.
If you load your image with imdecode, you can check errno :
std::vector<char> datas();
//Load yout image in datas here
errno = 0;
cv::Mat mat = cv::imdecode(datas, -1);
if (errno != 0)
{
//Error
}
(tested on OpenCV 3.4.1)
I found that the issue is in libjpeg. If OpenCV uses it, it gets error
Corrupt JPEG data: 22 extraneous bytes before marker 0xd9
You can try my solution to solve it. It disables JPEG during compilation. After that OpenCV cannot read/write, but it works.
cmake -D CMAKE_BUILD_TYPE=Release -D CMAKE_INSTALL_PREFIX=/usr/local -D BUILD_SHARED_LIBS=OFF -D BUILD_EXAMPLES=OFF -D BUILD_TESTS=OFF -D BUILD_PERF_TESTS=OFF -D WITH_JPEG=OFF -D WITH_IPP=OFF ..
I found an easy solution without the need to recompile openCV.
You can use imagemagick to detect the same errors, however it returns an error as expected. See the description here: https://stackoverflow.com/a/66283167/2887398