3 replaced http://mathematica.stackexchange.com/ with https://mathematica.stackexchange.com/ edited Apr 13 '17 at 12:56 Thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurements performed with ImageJ to illustrate it. Edit: I recommend to use this methodthis method to change coordinate. Note you'll have to change the following line. {center, radius} = {ImageDimensions[img]/2, ImageDimensions[img][[1]]}; . Best, Louis. Thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurements performed with ImageJ to illustrate it. Edit: I recommend to use this method to change coordinate. Note you'll have to change the following line. {center, radius} = {ImageDimensions[img]/2, ImageDimensions[img][[1]]}; . Best, Louis. Thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurements performed with ImageJ to illustrate it. Edit: I recommend to use this method to change coordinate. Note you'll have to change the following line. {center, radius} = {ImageDimensions[img]/2, ImageDimensions[img][[1]]}; . Best, Louis. 2 added 159 characters in body edited Aug 18 '16 at 16:07 Cortes Louis 111 bronze badge thankThank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurementmeasurements performed with ImageJ to illustrate it.   Edit: I recommend to use this method to change coordinate. Note you'll have to change the following line. {center, radius} = {ImageDimensions[img]/2, ImageDimensions[img][[1]]}; . Best, Louis. thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurement performed with ImageJ to illustrate it.   Best, Louis. Thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurements performed with ImageJ to illustrate it. Edit: I recommend to use this method to change coordinate. Note you'll have to change the following line. {center, radius} = {ImageDimensions[img]/2, ImageDimensions[img][[1]]}; . Best, Louis. 1 answered Aug 18 '16 at 15:52 Cortes Louis 111 bronze badge thank you for this. However, there is a problem when going from Cartesian to polar coordinate. The image is distorted. On my image the peaks are shifted, I joined measurement performed with ImageJ to illustrate it. Best, Louis.