TonyField Posted October 30, 2013 Share #1 Posted October 30, 2013 Advertisement (gone after registration) Does anyone know what the image processing path is for the M9?? It seems to me that the attached image suffers from two issues. One is that there is a stuck/dead pixel on image left and the other is the colour band across the top. My inference is that the stuck pixel is a sensor issue and this is transfered from the sensor shift register. The colour band issue is not associated with the sensor but actually happens after the pixels are read into a buffer and the image processing hardware/firmware creates the raw dng information. In other words, I infer that the issues are not related because of the orientation of the problem. Can anyone explain what happens at each stage of the image processing and why the colour band is "horizontal" as opposed to the "vertical" orientation of the stuck pixel. Leica has not responded to my query. Welcome, dear visitor! As registered member you'd see an image here… Simply register for free here – We are always happy to welcome new members! Link to post Share on other sites Simply register for free here – We are always happy to welcome new members! ' data-webShareUrl='https://www.l-camera-forum.com/topic/215670-m9-image-processing-path/?do=findComment&comment=2453940'>More sharing options...
Advertisement Posted October 30, 2013 Posted October 30, 2013 Hi TonyField, Take a look here M9 image processing path. I'm sure you'll find what you were looking for!
tobey bilek Posted October 31, 2013 Share #2 Posted October 31, 2013 Can not explain, but it has to go in for sensor remap anyway unless you want to fix in photoshop where you go to 100%, find the source pixel, make a 1 pixel wide selection, then do content aware fill. Write an action. More than 100 percent makes extra pixels so the selection becomes too large. Sometimes there is banding from a strong light source outside the image area, at least that was a problem with the M8. Looks like the image shown can be repeated as a test. Also do an even toned subject in low light with same iso and shutter speed with no strong lights. Link to post Share on other sites More sharing options...
mjh Posted October 31, 2013 Share #3 Posted October 31, 2013 Can anyone explain what happens at each stage of the image processing and why the colour band is "horizontal" as opposed to the "vertical" orientation of the stuck pixel. This is not so much a question of image processing but of sensor architecture. Each column of a CCD is read out by shifting the electrons captured in each pixel downward, bucket-brigade-style. One bad pixel within a column can thus affect the whole of the column. To the left and right of the active imaging area of the sensor there are reference pixels and each of these reference pixels affects all of the left or right half of its row, depending on which side it is on. Link to post Share on other sites More sharing options...
TonyField Posted November 1, 2013 Author Share #4 Posted November 1, 2013 To the left and right of the active imaging area of the sensor there are reference pixels and each of these reference pixels affects all of the left or right half of its row, depending on which side it is on. I agree that the stuck pixel is a sensor issue. However, I wonder if the banding colour is caused by the reference pixels. I have images in which the banding is internal to the image and does not propagate to the edges. Link to post Share on other sites More sharing options...
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