ElphelWiki - User contributions [en]

User:Jmf

2006-08-26T17:30:09Z

Jmf:

Hello 
my name is Jean-Marc FAGES 
i leaving Strasbourg - France 
i am electronic engineer and i begin to use
elphel camera and linux systems.

Talk:Known problems

2006-08-26T17:29:06Z

Jmf:

Just noticed - all MJPEG versions of 333 code (at least from v 6.3.4) skip each other frame, so the actual fps is just 1/2 of that of the sensor. Theora version works fine, I also remember fixing that for the 313 cameras. And so far nobody (including me) noticed that (or at least told me).

I'll work full speed on this issue, it is most likely caused by missing interrupts.

--[[User:Andrey.filippov|Andrey.filippov]] 19:10, 21 November 2005 (CST)
'''Found it''', will fix shortly. It was because only 2 extra lines were added to frame to accomodate 18x18tiles for 16x16 MCUs (how it was in 313), not 4 for 20x20 tiles. So compressor was waiting for the last 2 lines that came only with the new frame - too late.

So I'll test the fixed code, but still sensor driver need a complete rebuild - it is too messy by now after many modifications fro new sensors and cameras. So now period calculation is not correct when binning is used (and not all the data is in the Micron datasheet as actually binning works for up to 8, not just 3 as they write.
We also need to make a cleaner driver as more sensors aree coming soon - and they will have different controls.

--[[User:Andrey.filippov|Andrey.filippov]] 02:10, 22 November 2005 (CST)

Now it is gone --[[User:Andrey.filippov|Andrey.filippov]] 03:57, 22 November 2005 (CST)

--[[User:Jmf]] 26 august 2006

3 pictures just to illustrate known problems of CMOS with binning 
[[Image:binning_1.jpg|alt text]] 
[[Image:binning_2.jpg|alt text]] 
[[Image:binning_3.jpg|alt text]]

User:Jmf

2006-08-26T17:28:35Z

Jmf:

Hello
my name is Jean-Marc FAGES
i leaving Strasbourg - France
i am electronic engineer and i begin to use
elphel camera and linux systems.

Talk:Known problems

2006-08-26T17:26:03Z

Jmf:

Just noticed - all MJPEG versions of 333 code (at least from v 6.3.4) skip each other frame, so the actual fps is just 1/2 of that of the sensor. Theora version works fine, I also remember fixing that for the 313 cameras. And so far nobody (including me) noticed that (or at least told me).

I'll work full speed on this issue, it is most likely caused by missing interrupts.

--[[User:Andrey.filippov|Andrey.filippov]] 19:10, 21 November 2005 (CST)
'''Found it''', will fix shortly. It was because only 2 extra lines were added to frame to accomodate 18x18tiles for 16x16 MCUs (how it was in 313), not 4 for 20x20 tiles. So compressor was waiting for the last 2 lines that came only with the new frame - too late.

So I'll test the fixed code, but still sensor driver need a complete rebuild - it is too messy by now after many modifications fro new sensors and cameras. So now period calculation is not correct when binning is used (and not all the data is in the Micron datasheet as actually binning works for up to 8, not just 3 as they write.
We also need to make a cleaner driver as more sensors aree coming soon - and they will have different controls.

--[[User:Andrey.filippov|Andrey.filippov]] 02:10, 22 November 2005 (CST)

Now it is gone --[[User:Andrey.filippov|Andrey.filippov]] 03:57, 22 November 2005 (CST)

--[[User:Jean-Marc.fages]] 26 august 2006

3 pictures just to illustrate known problems of CMOS with binning 
[[Image:binning_1.jpg|alt text]] 
[[Image:binning_2.jpg|alt text]] 
[[Image:binning_3.jpg|alt text]]

Talk:Known problems

2006-08-26T17:24:24Z

Jmf:

Just noticed - all MJPEG versions of 333 code (at least from v 6.3.4) skip each other frame, so the actual fps is just 1/2 of that of the sensor. Theora version works fine, I also remember fixing that for the 313 cameras. And so far nobody (including me) noticed that (or at least told me).

I'll work full speed on this issue, it is most likely caused by missing interrupts.

--[[User:Andrey.filippov|Andrey.filippov]] 19:10, 21 November 2005 (CST)
'''Found it''', will fix shortly. It was because only 2 extra lines were added to frame to accomodate 18x18tiles for 16x16 MCUs (how it was in 313), not 4 for 20x20 tiles. So compressor was waiting for the last 2 lines that came only with the new frame - too late.

So I'll test the fixed code, but still sensor driver need a complete rebuild - it is too messy by now after many modifications fro new sensors and cameras. So now period calculation is not correct when binning is used (and not all the data is in the Micron datasheet as actually binning works for up to 8, not just 3 as they write.
We also need to make a cleaner driver as more sensors aree coming soon - and they will have different controls.

--[[User:Andrey.filippov|Andrey.filippov]] 02:10, 22 November 2005 (CST)

Now it is gone --[[User:Andrey.filippov|Andrey.filippov]] 03:57, 22 November 2005 (CST)

--[[User:Jean-Marc FAGES]] 26 august 2006

Just to illustrate problem of CMOS with binning
[[Image:binning_1.jpg|alt text]] 
[[Image:binning_2.jpg|alt text]] 
[[Image:binning_3.jpg|alt text]]

Talk:Known problems

2006-08-26T17:22:01Z

Jmf:

Just noticed - all MJPEG versions of 333 code (at least from v 6.3.4) skip each other frame, so the actual fps is just 1/2 of that of the sensor. Theora version works fine, I also remember fixing that for the 313 cameras. And so far nobody (including me) noticed that (or at least told me).

I'll work full speed on this issue, it is most likely caused by missing interrupts.

--[[User:Andrey.filippov|Andrey.filippov]] 19:10, 21 November 2005 (CST)
'''Found it''', will fix shortly. It was because only 2 extra lines were added to frame to accomodate 18x18tiles for 16x16 MCUs (how it was in 313), not 4 for 20x20 tiles. So compressor was waiting for the last 2 lines that came only with the new frame - too late.

So I'll test the fixed code, but still sensor driver need a complete rebuild - it is too messy by now after many modifications fro new sensors and cameras. So now period calculation is not correct when binning is used (and not all the data is in the Micron datasheet as actually binning works for up to 8, not just 3 as they write.
We also need to make a cleaner driver as more sensors aree coming soon - and they will have different controls.

--[[User:Andrey.filippov|Andrey.filippov]] 02:10, 22 November 2005 (CST)

Now it is gone --[[User:Andrey.filippov|Andrey.filippov]] 03:57, 22 November 2005 (CST)

Just to illustrate problem of CMOS with binning
[[Image:binning_1.jpg|alt text]]
[[Image:binning_2.jpg|alt text]]
[[Image:binning_3.jpg|alt text]]

File:Binning 3.jpg

2006-08-26T17:12:19Z

Jmf: Bug of CMOS sensor when you choise binning by 2 no vertical line if picture is crop

Bug of CMOS sensor when you choise binning by 2
no vertical line if picture is crop

File:Binning 2.jpg

2006-08-26T17:11:20Z

Jmf: Bug of CMOS sensor when you choise binning by 2 no vertical line if you set horizontal miror case

Bug of CMOS sensor when you choise binning by 2
no vertical line if you set horizontal miror case

File:Binning 1.jpg

2006-08-26T17:09:02Z

Jmf: Bug of CMOS sensor when you choise binning by 2

Bug of CMOS sensor when you choise binning by 2