D60 RAW write issue !

[medici]

If you have experianced an issue where camera does the following or similar please contact me by email if you are interested in having your name appear on a letter to Canon requesting your disatisfaction with the D60.

Press shutter, image does not appear on LCD immediately, # on top LCD changes to next lower image #, but does not blink as it does when writing to card, nor does the camera write to the card until you either press the shutter slightly, or take another shot. When camera begins to write after you have pressed shutter slightly, the image number on top LCD jumps to the next higher number.

Then when viewing image on playback in camera, thumbmbnail of image which did not write correctly appears for a second or less, then jumps to previous image. Upon download images from any cards or microdrive, either just the thumbnail is missing or RAW file is corrupt and cannot be opened.

Also, when 1 or 2 images are remaining according to top LCD #, and another shot is taken, Full CF appears on top LCD and blinks, image just taken is displayed on LCD right after shot or maybe not. Although image not written to card becasue it is full, image will show on rear during playback for second then jump to previous image. Upon download this image is not found on card.

Please list manufacturer and type of card or microdive used, purchase date of camera, and a contact number or email so Canon can contact you if they wish.

Thanks,

Mike Medici

 

[Jason Hutchinson]

Also, when 1 or 2 images are remaining according to top LCD #, and
another shot is taken, Full CF appears on top LCD and blinks, image
just taken is displayed on LCD right after shot or maybe not.
Although image not written to card becasue it is full, image will
show on rear during playback for second then jump to previous
image. Upon download this image is not found on card.

This problem is just caused by a scene that has more detail than the "average" scene which causes the JPG size to be very large. I don't think Canon is going to adopt a variable compression scheme to fix this problem.

Canon is working on the first problem. If their company is like ours, sending letters will not speed up the engineers.

Jason

 

[medici]

Well Canon says problem does not exist as I and others have experienced !

The bug you speak of is a file numbering issue, that I have not had a problem with !

Canon's repair center has seen the problem and replaced every digital component, problem still exisits !

Issue of final image not writing, but that it creates a thumbnail which jumps, maybe part of the bigger issue!

If you have the bug as I explained and want to officially report it email me !

Mike

Also, when 1 or 2 images are remaining according to top LCD #, and
another shot is taken, Full CF appears on top LCD and blinks, image
just taken is displayed on LCD right after shot or maybe not.
Although image not written to card becasue it is full, image will
show on rear during playback for second then jump to previous
image. Upon download this image is not found on card.

This problem is just caused by a scene that has more detail than
the "average" scene which causes the JPG size to be very large. I
don't think Canon is going to adopt a variable compression scheme
to fix this problem.

Canon is working on the first problem. If their company is like
ours, sending letters will not speed up the engineers.

Jason

 

[Rune Moberg]

Press shutter, image does not appear on LCD immediately, # on top
LCD changes to next lower image #, but does not blink as it does
when writing to card, nor does the camera write to the card until

Does the red LED blink at all?

Single shot mode?

Then when viewing image on playback in camera, thumbmbnail of image
which did not write correctly appears for a second or less, then
jumps to previous image. Upon download images from any cards or
microdrive, either just the thumbnail is missing or RAW file is
corrupt and cannot be opened.

And you're experiencing this with various CF brands and models? (I recommend a thorough format using your PC and then a format using the camera prior to usage -- the first will scan the media for defects, the latter makes sure the Canon specific folders are put on the device)

Thumbnail corruption is quite common amongst us RAW shooters, but corrupted RAW images is a completely different matter AFAIK.

Also, when 1 or 2 images are remaining according to top LCD #, and
another shot is taken, Full CF appears on top LCD and blinks, image

Raw file size varies. I've never had less than 10 shots remaining before emptying my MD, but at that point I had 170-something shots on the drive and to start with the counter displays 141 (assuming ISO 100).

The camera obviously makes some educated guesses and in your case guessed wrong. If your complaint is heard, then all you'll achieve is that the camera will be made even more conservative in this regard, and won't let you take that last picture even if there might just (with some luck) be room for just one more...

I.e. if there's 7MB left, there's a good chance you might be able to fit a raw image in there, but that's not always the case...

just taken is displayed on LCD right after shot or maybe not.
Although image not written to card becasue it is full, image will
show on rear during playback for second then jump to previous
image. Upon download this image is not found on card.

Does the image disappear even when you're copying the files using a card reader? (could this be related to Canon's TWAIN driver?)

--
Rune

 

[Rune Moberg]

Issue of final image not writing, but that it creates a thumbnail
which jumps, maybe part of the bigger issue!

AFAIK this is just the corrupted thumbnail bug. It'll do this, because the camera first displays the thumbnail, then goes to fetch the jpeg embedded in the raw file itself (which is when the display usually gets less coarse, or in this case: jumps to a "different" image).

--
Rune

 

[Roine Karlsson]

Hello Mike

Did Your test on my D60 with 1.02 (was delivered with 1.02)
=======================================

Test 1, IBM Microdrive, RAW, One shot, waited mor than 10 sec between eatch picture, 8 sec preview.

Took one picture, it was saved, took another, no life of the micro drive, took next picture etc up to 7. All seven was saved, but picture 2 has a jumping thumbnail.

Formatted the microdrive.

Took one picture, it was saved and shown in the preview, took another picture, no show up, waited 1-2 minutes, I did power off the camera, put the micro drive in my cf reader, only one picture was on the microdrive (1 CRW+1 THM)

Formatted the drive in the camera again, same test, same outcome for the non show on LCD, but didn’t check if there was any lost files

Formatted the drive, tested, same outcome regarding LCD preview, but this time I push the menu button, after that the play (show) button, now the two pictures was on the microdrive.

Test 2:
=====
With a 96MB Viking CF

Cant repeat any falure. Tested 10 times

Test 3
=======

Retested the micro drive, cant repeat the failure the first 4 times (take photos, format the drive)

Turn 5, Took 2 picture, all seems ok, waited several minutes, but not 8 minutes that is my power off setting, took one picture, did show up in preview, but not the next, No show up on preview, power off the camera, all pictures was on the micro drive, but thm file 3 was 3kb (All other 8kb). BreezeBrowser confirming that picture 3 has a bad thm by showing a black box in the overview setting.

Took another and another micro drive (has 5 Micro drives, cant get the failure for 10 test on each)

Got back to the first Micro drive, can´t repeat the failure for missing files, but got one THM failure.

Hard to say, the CF micro drive, me, the camera?

Is the missing files due to that it takes longer time to recover from theTHM failure and that I took out the micro drive to fast (

All failures seems to bee the THM failure except for the missing file, but i can’t repeat the missing file test.

Roine

If you have experianced an issue where camera does the following or
similar please contact me by email if you are interested in having
your name appear on a letter to Canon requesting your
disatisfaction with the D60.

Press shutter, image does not appear on LCD immediately, # on top
LCD changes to next lower image #, but does not blink as it does
when writing to card, nor does the camera write to the card until
you either press the shutter slightly, or take another shot. When
camera begins to write after you have pressed shutter slightly, the
image number on top LCD jumps to the next higher number.

Then when viewing image on playback in camera, thumbmbnail of image
which did not write correctly appears for a second or less, then
jumps to previous image. Upon download images from any cards or
microdrive, either just the thumbnail is missing or RAW file is
corrupt and cannot be opened.

Also, when 1 or 2 images are remaining according to top LCD #, and
another shot is taken, Full CF appears on top LCD and blinks, image
just taken is displayed on LCD right after shot or maybe not.
Although image not written to card becasue it is full, image will
show on rear during playback for second then jump to previous
image. Upon download this image is not found on card.

Please list manufacturer and type of card or microdive used,
purchase date of camera, and a contact number or email so Canon can
contact you if they wish.

Thanks,

Mike Medici

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in reading...Sorry!

 

[medici]

LEd does not blink at all until shutter is depresewed 1/2 way or another shot is taken.

Happens in continuous, single and self timer !

Mike

Press shutter, image does not appear on LCD immediately, # on top
LCD changes to next lower image #, but does not blink as it does
when writing to card, nor does the camera write to the card until

Does the red LED blink at all?

Single shot mode?

Then when viewing image on playback in camera, thumbmbnail of image
which did not write correctly appears for a second or less, then
jumps to previous image. Upon download images from any cards or
microdrive, either just the thumbnail is missing or RAW file is
corrupt and cannot be opened.

And you're experiencing this with various CF brands and models? (I
recommend a thorough format using your PC and then a format using
the camera prior to usage -- the first will scan the media for
defects, the latter makes sure the Canon specific folders are put
on the device)

Thumbnail corruption is quite common amongst us RAW shooters, but
corrupted RAW images is a completely different matter AFAIK.

Also, when 1 or 2 images are remaining according to top LCD #, and
another shot is taken, Full CF appears on top LCD and blinks, image

Raw file size varies. I've never had less than 10 shots remaining
before emptying my MD, but at that point I had 170-something shots
on the drive and to start with the counter displays 141 (assuming
ISO 100).

The camera obviously makes some educated guesses and in your case
guessed wrong. If your complaint is heard, then all you'll achieve
is that the camera will be made even more conservative in this
regard, and won't let you take that last picture even if there
might just (with some luck) be room for just one more...

I.e. if there's 7MB left, there's a good chance you might be able
to fit a raw image in there, but that's not always the case...

just taken is displayed on LCD right after shot or maybe not.
Although image not written to card becasue it is full, image will
show on rear during playback for second then jump to previous
image. Upon download this image is not found on card.

Does the image disappear even when you're copying the files using a
card reader? (could this be related to Canon's TWAIN driver?)

--
Rune

 

[Roine Karlsson]

Hello again

A following up

Tested again, and again and did see:

If I get a THM error, as stated by Mike, nothing is saved until I take next picture, or at least press the button half way.

But, if I decided not to do this (maybe my last picture), I power off the camera after eg one minute after I get a non show on the LCD, then the camera flushes the last picture to the disk after a delay (with the power switch in off position). So if I don’t check the red led before open and take away the micro drive, I destroy the writing. This may be the case in my test.

Roine

 

[medici]

Roine,

Your issue sounds the same as mine and others !

I have used only CF, 2- Lexar 8x 128, Lexar 12x 128, Lexar 16x 512, Kingston 128 and today a new Microtech 256. Interesting the microtech CF is the fastest !!!

Probelms occur with each. Maybe able to fill smaller 18 cards once, then problem occurs after reformating or erasing card.

Mike

Hello again

A following up

Tested again, and again and did see:
If I get a THM error, as stated by Mike, nothing is saved until I
take next picture, or at least press the button half way.

But, if I decided not to do this (maybe my last picture), I power
off the camera after eg one minute after I get a non show on the
LCD, then the camera flushes the last picture to the disk after a
delay (with the power switch in off position). So if I don’t check
the red led before open and take away the micro drive, I destroy
the writing. This may be the case in my test.

Roine

 

[Roine Karlsson]

Hello Mike

But I don’t follow You completely. I did find the THM problem, that has been confirmed by Chuck. The missing file problem is not proven by the test I did, it may have been me taking out the micro drive to fast or it may have been the problem You have.

Roine

Your issue sounds the same as mine and others !

I have used only CF, 2- Lexar 8x 128, Lexar 12x 128, Lexar 16x
512, Kingston 128 and today a new Microtech 256. Interesting the
microtech CF is the fastest !!!

Probelms occur with each. Maybe able to fill smaller 18 cards once,
then problem occurs after reformating or erasing card.

Mike

Hello again

A following up

Tested again, and again and did see:
If I get a THM error, as stated by Mike, nothing is saved until I
take next picture, or at least press the button half way.

But, if I decided not to do this (maybe my last picture), I power
off the camera after eg one minute after I get a non show on the
LCD, then the camera flushes the last picture to the disk after a
delay (with the power switch in off position). So if I don’t check
the red led before open and take away the micro drive, I destroy
the writing. This may be the case in my test.

Roine

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in reading...Sorry!

 

[medici]

Roine,

Corrupted files have happend, appears to have happend when shooting RAW without stopping, mostly it is the missing thumbnail. it can be worked around, but we purchased a new camera which was to work correctly !

I'm not sure Chuck has confirmed jumping thumbnail, but you maybe right. I thought the only confirmation was the file numbering issue ?

Interesting, that Canon repair has not heard of the jumping thumbnail issue at all !!!

Mike

But I don’t follow You completely. I did find the THM problem, that
has been confirmed by Chuck. The missing file problem is not proven
by the test I did, it may have been me taking out the micro drive
to fast or it may have been the problem You have.

Roine

Your issue sounds the same as mine and others !

I have used only CF, 2- Lexar 8x 128, Lexar 12x 128, Lexar 16x
512, Kingston 128 and today a new Microtech 256. Interesting the
microtech CF is the fastest !!!

Probelms occur with each. Maybe able to fill smaller 18 cards once,
then problem occurs after reformating or erasing card.

Mike

Hello again

A following up

Tested again, and again and did see:
If I get a THM error, as stated by Mike, nothing is saved until I
take next picture, or at least press the button half way.

But, if I decided not to do this (maybe my last picture), I power
off the camera after eg one minute after I get a non show on the
LCD, then the camera flushes the last picture to the disk after a
delay (with the power switch in off position). So if I don’t check
the red led before open and take away the micro drive, I destroy
the writing. This may be the case in my test.

Roine

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in
reading...Sorry!

 

[Jason Hutchinson]

Interesting, that Canon repair has not heard of the jumping
thumbnail issue at all !!!

Mike

What I don't think you understand is that not every person at Canon is 100% up to date on things. When I say "Canon knows about a problem." I mean that the people that matter know about it. Many repair people will act clueless about it either on purpose or they just don't know. Their bug tracking system (if they have one) may not be perfect.

My company does this all the time because the people in field service don't know everything there is to know about a product.

 

[Rune Moberg]

worked around, but we purchased a new camera which was to work
correctly !

Of course, but all software contains bugs. Fixing bugs is usually easy, testing the fix is usually the hard part that takes time. Any fool can rush a quick fix out the door...

I'm not sure Chuck has confirmed jumping thumbnail, but you maybe
right. I thought the only confirmation was the file numbering issue

I distinctly recall that someone commented here that Chuck apologized for the lack of a fix for the thumbnail issue. They wanted to release 1.02 in order to address some other issues, and did not want to delay it further. As I understood it we have another upgrade coming.

Roine's observation that "the camera flushes the last picture to the disk after a delay (with the power switch in off position). " is an important one, and it'd be interesting to know if this could be the culprit in your case as well (the missing raw file issue -- I suggest we keep thumbnails out of this for now) ?

Personally I used to have only a single MicroDrive (got my second drive yesterday - whohoo!) and as such it would remain in the camera until I got home. I.e. plenty of time to flush stuff to the drive after poweroff without me ever noticing. I suspect this is the behavorial pattern most D60 users stick to.

It sounds like Canon's buffering techniques could do with, if not a complete rewrite, then atleast a slight overhaul. In the meantime, do a half depress of the shutter (which, if I read Roine's message correctly, causes a flush to the drive) before changing CF cards and see if that makes a difference.

Obviously that's not the ultimate solution, but understanding the problem thoroughly prior to reporting it will make it easier for Canon's software developers to fix it. (and counts more than thousands of signatures on a petition)

Interesting, that Canon repair has not heard of the jumping
thumbnail issue at all !!!

Well, ask them about the 'missing thumbnail' issue (which is what it sounds like to me). Maybe that'll ring some bells?

--
Rune

 

[medici]

Rune,

Pressing the shutter slightly or taking another shot, causes the camera to write to the card!

Since Canon says they have not been able to replicate the problem, I have offered my camera to anyone at Canon who would like to see the problem, they have declined !

But also say they have not seen the issue as I explained. Which is take a shot, image does not appear on LCD immediately after shooting, image is not written to card until another shot is taken or shutter is pressed halfway. When the camera does not write, this creates the missing/jumping thumbnail !

If the shutter is not pressed again image stays in buffer, if you turn off camera it begins to write to card or a CF Error occurs, or camera just shuts down and then an image is lost.

Or take shot, no image appears on LCD, press image playback button, LCD says busy, but camera still does not write to card, busy remains until shutter is pressed again, partially or fully, or camera is shut off manually or reaches the auto shut off time !

Mike

worked around, but we purchased a new camera which was to work
correctly !

Of course, but all software contains bugs. Fixing bugs is usually
easy, testing the fix is usually the hard part that takes time. Any
fool can rush a quick fix out the door...

I'm not sure Chuck has confirmed jumping thumbnail, but you maybe
right. I thought the only confirmation was the file numbering issue

I distinctly recall that someone commented here that Chuck
apologized for the lack of a fix for the thumbnail issue. They
wanted to release 1.02 in order to address some other issues, and
did not want to delay it further. As I understood it we have
another upgrade coming.

Roine's observation that "the camera flushes the last picture to
the disk after a delay (with the power switch in off position). "
is an important one, and it'd be interesting to know if this could
be the culprit in your case as well (the missing raw file issue --
I suggest we keep thumbnails out of this for now) ?

Personally I used to have only a single MicroDrive (got my second
drive yesterday - whohoo!) and as such it would remain in the
camera until I got home. I.e. plenty of time to flush stuff to the
drive after poweroff without me ever noticing. I suspect this is
the behavorial pattern most D60 users stick to.

It sounds like Canon's buffering techniques could do with, if not a
complete rewrite, then atleast a slight overhaul. In the meantime,
do a half depress of the shutter (which, if I read Roine's message
correctly, causes a flush to the drive) before changing CF cards
and see if that makes a difference.

Obviously that's not the ultimate solution, but understanding the
problem thoroughly prior to reporting it will make it easier for
Canon's software developers to fix it. (and counts more than
thousands of signatures on a petition)

Interesting, that Canon repair has not heard of the jumping
thumbnail issue at all !!!

Well, ask them about the 'missing thumbnail' issue (which is what
it sounds like to me). Maybe that'll ring some bells?

--
Rune

 

[Roine Karlsson]

Hello Rune

The only combination I haven’t tested regarding flushing the picture with the TMH problem is if I wait until automatic shutdown. I don’t know if the buffer is flushed then or just lost.

Roine

worked around, but we purchased a new camera which was to work
correctly !

Of course, but all software contains bugs. Fixing bugs is usually
easy, testing the fix is usually the hard part that takes time. Any
fool can rush a quick fix out the door...

I'm not sure Chuck has confirmed jumping thumbnail, but you maybe
right. I thought the only confirmation was the file numbering issue

I distinctly recall that someone commented here that Chuck
apologized for the lack of a fix for the thumbnail issue. They
wanted to release 1.02 in order to address some other issues, and
did not want to delay it further. As I understood it we have
another upgrade coming.

Roine's observation that "the camera flushes the last picture to
the disk after a delay (with the power switch in off position). "
is an important one, and it'd be interesting to know if this could
be the culprit in your case as well (the missing raw file issue --
I suggest we keep thumbnails out of this for now) ?

Personally I used to have only a single MicroDrive (got my second
drive yesterday - whohoo!) and as such it would remain in the
camera until I got home. I.e. plenty of time to flush stuff to the
drive after poweroff without me ever noticing. I suspect this is
the behavorial pattern most D60 users stick to.

It sounds like Canon's buffering techniques could do with, if not a
complete rewrite, then atleast a slight overhaul. In the meantime,
do a half depress of the shutter (which, if I read Roine's message
correctly, causes a flush to the drive) before changing CF cards
and see if that makes a difference.

Obviously that's not the ultimate solution, but understanding the
problem thoroughly prior to reporting it will make it easier for
Canon's software developers to fix it. (and counts more than
thousands of signatures on a petition)

Interesting, that Canon repair has not heard of the jumping
thumbnail issue at all !!!

Well, ask them about the 'missing thumbnail' issue (which is what
it sounds like to me). Maybe that'll ring some bells?

--
Rune

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in reading...Sorry!

 

[Roine Karlsson]

Hello Mike

Cant really follow all that You writes. As I read You:

1. The buffer issue is one thing
2. The TMH problem another

3. The lost files a another in combination with not flushing the buffer or full CF card.

The TMH problem is off this issue of losing files. Its a warning that You may lose a file or something like that.

Which of these have You tested and have repeated?

Thanks for list of issues. Se if I have time to test more later this weekend.

Roine

Pressing the shutter slightly or taking another shot, causes the
camera to write to the card!

Since Canon says they have not been able to replicate the problem,
I have offered my camera to anyone at Canon who would like to see
the problem, they have declined !

But also say they have not seen the issue as I explained. Which is
take a shot, image does not appear on LCD immediately after
shooting, image is not written to card until another shot is taken
or shutter is pressed halfway. When the camera does not write, this
creates the missing/jumping thumbnail !

If the shutter is not pressed again image stays in buffer, if you
turn off camera it begins to write to card or a CF Error occurs, or
camera just shuts down and then an image is lost.

Or take shot, no image appears on LCD, press image playback button,
LCD says busy, but camera still does not write to card, busy
remains until shutter is pressed again, partially or fully, or
camera is shut off manually or reaches the auto shut off time !

Mike

worked around, but we purchased a new camera which was to work
correctly !

Of course, but all software contains bugs. Fixing bugs is usually
easy, testing the fix is usually the hard part that takes time. Any
fool can rush a quick fix out the door...

I'm not sure Chuck has confirmed jumping thumbnail, but you maybe
right. I thought the only confirmation was the file numbering issue

I distinctly recall that someone commented here that Chuck
apologized for the lack of a fix for the thumbnail issue. They
wanted to release 1.02 in order to address some other issues, and
did not want to delay it further. As I understood it we have
another upgrade coming.

Roine's observation that "the camera flushes the last picture to
the disk after a delay (with the power switch in off position). "
is an important one, and it'd be interesting to know if this could
be the culprit in your case as well (the missing raw file issue --
I suggest we keep thumbnails out of this for now) ?

Personally I used to have only a single MicroDrive (got my second
drive yesterday - whohoo!) and as such it would remain in the
camera until I got home. I.e. plenty of time to flush stuff to the
drive after poweroff without me ever noticing. I suspect this is
the behavorial pattern most D60 users stick to.

It sounds like Canon's buffering techniques could do with, if not a
complete rewrite, then atleast a slight overhaul. In the meantime,
do a half depress of the shutter (which, if I read Roine's message
correctly, causes a flush to the drive) before changing CF cards
and see if that makes a difference.

Obviously that's not the ultimate solution, but understanding the
problem thoroughly prior to reporting it will make it easier for
Canon's software developers to fix it. (and counts more than
thousands of signatures on a petition)

Interesting, that Canon repair has not heard of the jumping
thumbnail issue at all !!!

Well, ask them about the 'missing thumbnail' issue (which is what
it sounds like to me). Maybe that'll ring some bells?

--
Rune

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in reading...Sorry!

 

[LCD]

Just a thought, maybe the shutter button or some aspect of its use is dodgy. Has it been replaced?

LCD

 

[Roine Karlsson]

Hello LCD

Can’t se any reason to believe that. Can You explain Your theory?

I have no theory at all, but if I have a point in the flushing during power off and replacing the CF to soon, that explains why it seems that JPG does not have the problem, the JPG is written faster to the CF and is probably written down when You removes the CF.

But this is just fiction just now, no real fact.

Roine

Just a thought, maybe the shutter button or some aspect of its use
is dodgy. Has it been replaced?

LCD

--
[email protected] / http://www.roine.nu
Anyway I'm not good at English, so you may have some trouble in reading...Sorry!

 

[Rune Moberg]

Can’t se any reason to believe that. Can You explain Your theory?

AFAICT, if you half-press the shutter button, you'll abort any picture review in progress. However, I tried to slowly depress the button after taking the picture, and it doesn't abort until I've completely released the button and then half-pressed it again.

If the button is malfunctioning to such a degree that it'll register a button release event shortly after the picture is taken, then I guess it's conceivable that it'll abort the picture review as you release the button. Sounds unlikely, but then again, AFAICT this doesn't occur on the majority of D60 units out there?

I have no theory at all, but if I have a point in the flushing
during power off and replacing the CF to soon, that explains why it
seems that JPG does not have the problem, the JPG is written faster
to the CF and is probably written down when You removes the CF.

As good a theory as any.

--
Rune

 

[Pierre-Yves Sulem]

I am perhaps experiencing the same problem as you but I am not sure yet... For the time being, I am in holidays and not able to make the requested tests (especially, downloading pics on a PC). What I am sure of is :

• sometimes, after taking a shot, the picture is not displayed on the LCD;
• sometimes, I have the same problem of jumping thumbnail when reviewing my pictures.

Let's keep in touch.
--
Pierre-Yves Sulem
http://perso.wanadoo.fr/mon_oeil