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if i try to load a picture with say 219 x 512 pixels, the decoder fails.
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Demo application crushes or produces strange JPEGs if I try to encode 8bpp bitmaps. It seems to be the problem of the demo itself, not of the encoders.
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hi tony, i've got a question, i'm writing an application to creating a bitmap, for example a white bmp 500x400 with three red point at coordinate (2,3) (5,6) and (3,5). Do you have any idea?
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Hi Tony, thanks for your nice code, I am ready to port
your code to a 24-bits CPU, can I just replace all 32-bits
int to 24-bits int, what else should I pay attention.
Thanks
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Thanks for this excellent article! I wanted to have a look at how JPEG works, and this article is ideal, because the quality of your coding and commenting are first-rate. It's very well written, and very well explained. Good effort!
Duncan
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Salam Sir,
I have downloaded the j2kdemo , and I have images of jp2 dormat .. when I open those images using the demo a blank window is opened . what is the reason if u know.
If the problem is with the images themselves can u send me jp2 image so I can test on it .. or is there any sites that service with these images.
Thanks
nnn
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Can I ask you a question about IJG’s sourse code jpeg_6b,
In the source code jpeg_6b,where is the quantized DCT coefficients is stored(in which file and in which buffer) during the compress and decompress course.Thanks first!
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Hi Tony,
nice code and example. I've got a question about the J2kDll.dll. Did you write it or is it from Jasper? I'd like to use it and want to implement a progress bar
to show the status of converting.
would be nice if you could send me answer to lonicmedia@gmx.de
best greetings from Berlin - Germany, Peter
Thanx for Help...
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I have test it, if the file name like : a.b.jp2, and use ImageTranscode API to convert bmp file to jp2 file, the error will occured.
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hi tony,
is there anywhere online that i can get the info on the AA&N algorithm. Nice code
pt
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Sir,
please give me the source code for the progressive or 2000 jpeg file format to open the image. Its really very urgent.
Sir, I will be very greateful if You give the code for the same.
Debasish Nath
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Hi debashish,
Please search for jj200 or kakadu or jasper , you'll get what u requiure
Emmanuel
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你好,Tony
你那个ImageTranscode函数效率好像很低啊,能改进一下或者提供源代码吗?
对了,ImageTranscode函数的第三个参数int ratio,在jasper、j2k中是怎么使用啊?
请指教,谢谢!
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hi ligs2001,
Please write your words in english , ok ?
WHere the implement code of ImageTranscode api ? I don't know.
HI ligs, if you have the implement code, you can easily to improve it. But I have not find it.
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Hi Mr. Lin,
As you said, jasper is really hard to read to understand. and looks like jpeg2000 source is good for the image compression and decompression for the students and programmer. Do you have any plan to share your source on this topic? or can you introduce us a simpler source to reference? Thanks your great help.
Good day!!
Bruce
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Hi Bruce,
Hah, just wait, until I have time to write one simple-formatted JPEG-2000 c++ class. But now I have to write
papers.
Tony
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Hi Tony,
Thanks your kindly answer.
I will be very appreciated to your jpeg2000 c++ sharing^^
Just, when can you finish your papers?
hehee...I would like to remind you when you finish the papers.
Thanks in advance and hope everything is smooth for your papers.
Bruce
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When I use your code to decode M-JPEG stream, I always get some error in decoding, perhaps the JPEG frame is damaged. If any error happens when decoding, I want to catch it and skip to next frame, would you give me some help?
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Hello,
I'd like to decode a jpeg2000 image that is stored in memory. The function ImageTranscode() allows only the transformation of a file stored on disk to another file on disk. How can transformation in memory be done?
Can I look into the sources of j2kdll?
Regards, Stefan
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I dont know how to decode j2k file in memory by jasper. If you want that, maybe you should check jasper codec carefully and change it for your purpose. Good luck!
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Hi Tony,
Great code. Easy to understand. I followed up line by line for the JPEG Encoder and it works great!
Do you have something similar for JPEG-2000? - I mean a single file without the regular BS.
I need to port a JPEG-2000 to a DSP processor, and an approach liker yours suits me best.
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Thanks. I have no time to do the same work for JPEG 2000, though maybe just one month is enough. The jasper codec is hard to read.
I have to do research and write papers.
By the way, resently I read Dr. Jin Li's review paper on JPEG 2000. It clarifies the key steps in jpeg-2000, and I think it is better than other reviews on jpeg-2000.
J. Li, "Image compression - the mathematics of JPEG 2000", in MSRI modern signal processing series.
http://research.microsoft.com/~jinl/paper_2002/msri_jpeg.htm
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Hi,Tony
I'm a new one majoring in image processing.I wrote a programme using wavelet to compress image recently.How ever,it doesn't work very well.
Can you tell me which wavelet filter you have used in your process?Any suggestions in choosing the filters you can give me?How about Daubechies filters?Please recommend some source codes or stuff to me.
Sorry,seems a lot of questions.;P
Really appreciate your help!
I want to be an expert!
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Hi,Tony.
I'm a new one majoring in the image processing.I wrote a programme using wavelet to compress image by myself recently.However,it doesn't work very well.
Can you tell me which wavelet filter you have used in your process or give me some advices about the choosing of the filters?How about Daubechies filters?Any source code or stuff can you recommend to me?
sorry,seems a lot of questions.;P
Really appreciate your help!
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i use the 100% quality, but the saved picture quality is so poor, that i have to give up using these code in my program.
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