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Questions tagged [jpeg2000]

JPEG2000 is an image encoded format intended to supercede JPEG.

JPEG 2000 is an image compression standard and coding system. It was created by the Joint Photographic Experts Group committee in 2000 with the intention of superseding their original discrete cosine transform-based JPEG standard (created in 1992) with a newly designed, wavelet-based method.

JPEG2000 is supported by Webkit based browsers (Safari, Chrome) on Mac OS X.

More information at Wikipedia page of JPEG2000

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got an error on decoding jpeg2000 in c++ with OpenJPEG

I am trying to decode JPEG2000 format with OpenJPEG. (Decoding just one raw tile buffer from a svs file.) But I got an error on opj_read_header(). Is there something I forgot to set before calling opj_read_header()? opj_image_t *image =…
YJJ
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Not Safari-friendly alpha with Freeimage JP2 export

I'm using Freeimage 3.17.0 .NET to export some images with alpha in Jpeg2000 (JP2) format. When I load the exported images in GIMP, I can see they have an alpha channel, but they don't seem to be compliant with Safari, because Safari in both iOS and…
endavid
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OpenJPEG: How to set the stepsizes used for quantization?

I have a JP2-file that I decompress and want to recompress Using OpenJPEG. For the original ojp_dump returns: stepsizes (m,e)=(2046,12) The re-encoded imgage has many stepsizes: stepsizes (m,e)=(1824,14) (1776,14) (1776,14) (1728,14) (1792,13)…
DelMar
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How to find geo location coordinates for a particular pixel with JPEG2000 and GML?

I have JPEG2000 image with GML in XML as metadata. From GML I can fetch location coordinates of top left pixel (0,0). Do you have any idea how to find location coordinates for any pixel in the image (m,n)? On the image below you can see GML XML…
Branko
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CGPDFDocument can't draw jpeg2000?

HI,guys. I'm using this code to draw pdf,but i've compress the pdf's image to jpeg2000.so the cgpdfdocument can't decode the jpeg2000,just show noting but blank.how can i make it to decode the jpeg2000? thanks.any advice will be…
zhouxiang
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how can to calculate jpeg2000 file header size in matlab?

I want to know size of header in an image in jpeg2000 format. how can I find out this header? I want to calculate pure size of image.jp2 in hard disk without the size of header. I use iminfo to find some information in matlab about image, but I…
reihan
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Read jpeg metadata with jai-imageio-jpeg2000

I want to read some jpeg metadata like width, height, color depth and resolution with jai-imageio-jpeg2000 library. Is there any example for it?
mohammad_1m2
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How to decompress jpeg2000 encoded files using OpenJPEG?

I doing an image service to decompress dicom images ans save them as BMP(using dcmtk). Incase of jpeg2000 it is adviced to use OpenJPEG(2.1.1). How can i pass the compressed image to OpenJPEG and get Uncompressed image back. Suggestions are…
Arunkumar Kathirvel
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Can a JPEG2000 file have multiple fragment list box?

According to specification, The Fragment List box specifies the location, length and order of each of the fragments that, once combined, form a valid and complete data stream. I want to know can single JPEG2000 file have multiple fragment list box?
Manish Gautam
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Doesn't wavelet decomposition halve the dimensions of original image size in jpeg 2000

From https://github.com/plroit/Skyreach/wiki/Understanding-scalability-in-JPEG2000 an input image is divided into four images, each a quarter of the size of the input. Each of the four images is called a subband. One subband that is labeled…
sumeet inani
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Converting control characters to XML?

The JPEG-2000 standard says that the file type box contains a series of compatibility list fields. It says this about each field: This field is encoded as a four-byte string of ISO/IEC 646 characters. Here is a compatibility list field from one…
Roger Costello
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jpeg2000 uses wavelet transform that works on tile , what if tile is small

I read that wavelet transform works on image as whole so no blocking artifacts , while JPEG does DCT on blocks of image so there is . If we have 1024x1024 image and take tiles of 128x128 , then won't wavelet transform be applied independently on…
user1371666
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Image compression using Lossy Compression technique

I need to convert PNG to JPEG,JPEG 2000 using ImageMagick and Matlab. I want to compress all data with ratio ( e.g. 10) and then specify some file size? Any idea or solution to achieve the specific file size? How can I do it? Thanks
user7801697
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Encoding image into Jpeg2000 using Distributed Computing like Hadoop

Just wondering if anybody has done/aware about encoding/compressing large image into JPEG2000 format using Hadoop ? There is also this http://code.google.com/p/matsu-project/ which uses map reduce to process the image. Image size is about 1TB+ and…
Lydon Ch
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JPEG2000 : Can number of resolution levels be different for different components in a single .jp2 image?

Can number of resolution levels be different for different components in a single jp2 image? For example, maxlevel = 5 for component 1 maxlevel = 7 for component 2 mexlevel = 5 for component 3 maxlevel = 5 for component 4 Correct me if any.
Manish Gautam
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