topic Jpeg decoder cannot read image header in Intel® Integrated Performance Primitives

Jpeg decoder cannot read image header

Gregory_Begelman — Tue, 31 May 2011 13:43:24 GMT

Hello,

I use the UIC JPEG decoder to decode images. The method ReadHeader fails on the attached image. Can this be a bug in UIC?

Thank you.

Jpeg decoder cannot read image header

Thomas_Jensen1 — Tue, 31 May 2011 17:52:02 GMT

I tested your jpeg using the latest IPP 7.4 Picnic sample app, and it fails loading it.
Windows 7 and LeadTools 16.5 can open it though. It appears to be an image saved by Photoshop on an Apple computer. It is probably corrupt in some way, and UIC cannot recover from the missing/bad data.

Jpeg decoder cannot read image header

Gregory_Begelman — Wed, 01 Jun 2011 10:06:15 GMT

Other libraries successfully decode this image (like libjpeg-turbo). I suppose UIC should be able to decode it too.

Jpeg decoder cannot read image header

Vladimir_Dudnik — Wed, 01 Jun 2011 18:04:11 GMT

Hello,

we have tested this image with UIC JPEG decoder and can confirm that there is a bug in UIC implementation. We are working on providing the fix for this issue. I'll update you once it is ready.
Note, the issue affects UIC sample code only, no changes in IPP libraries are needed.

Regards,
Vladimir

Jpeg decoder cannot read image header

Sergey_Ryadno — Mon, 06 Jun 2011 11:02:58 GMT

hi,

i think i found the reason for this problem. To resolve it in file bitstreamin.cpp function CheckByte() need some modification. Try this solution and write here your results.

[bash]JERRCODE CBitStreamInput::CheckByte(int pos, int* byte)
{
  JERRCODE jerr;

  if(m_currPos + pos >= m_DataLen)
  {
    //jerr = Seek(pos);
    jerr = FillBuffer();
    if(JPEG_OK != jerr)
      return jerr;

    //*byte = m_pData[0];
    *byte = m_pData[pos];
  }
  else
    *byte = m_pData[m_currPos + pos];

  return JPEG_OK;
} // CBitStreamInput::CheckByte()[/bash]

Jpeg decoder cannot read image header

Thomas_Jensen1 — Mon, 06 Jun 2011 11:58:27 GMT

I can confirm that with this fix, the image in question can be decoded successfully.