Image Processing Toolbox

Nesting Calls to Image Arithmetic Functions

You can use the image arithmetic functions in combination to perform a series of operations. For example, to calculate the average of two images,

You could enter

• I = imread('rice.tif');
  I2 = imread('cameraman.tif');
  K = imdivide(imadd(I,I2), 2); % not recommended 
  

However, when used with uint8 or uint16 data, each arithmetic function truncates its result before passing it on to the next operation. This truncation can significantly reduce the amount of information in the output image. A better way to perform this series of calculations is to use the imlincomb function. imlincomb performs all the arithmetic operations in the linear combination in double precision and only truncates the final result.

• K = imlincomb(.5,I,.5,I2); % recommended 
  

Dividing Images

Coordinate Systems