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mmaddm
Addition of two images, with saturation.

Synopsis

function y = mmaddm ( f1 , f2 )

Input

f1 Image Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image
f2 Image Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image

Or constant.

Output

y Image Unsigned gray-scale (uint8 or uint16), signed (int32) or binary image

Description

mmaddm creates the image y by pixelwise addition of images f1 and f2. When the addition of the values of two pixels saturates the image data type considered, the greatest value of this type is taken as the result of the addition.

Examples

f=uint8([255   255    0   10    0   255   250]);

g=uint8([ 0    40   80   140  250    10    30]);

y1=mmaddm(f,g)

y1 =
  255  255   80  150  250  255  255

y2=mmaddm(g,uint8(100))

y2 =
  100  140  180  240  255  110  130

a = mmreadgray('keyb.tif');

b = mmaddm(a,128);

Warning: converting image from scalar to uint8

mmshow(a); 

mmshow(b);
a b

Equation

Algorithm

function y = mmaddm_equ(f1,f2)
if (mmisbinary(f1) & mmisbinary(f2))
   k = 1;
elseif (isa(f1,'uint8') | isa(f2,'uint8'))
   k = 255;
else
   k = 65535;
end
y = min(min(f1+f2,k));

See also

mmfreedom Control automatic data type conversion.
mmsubm Subtraction of two images, with saturation.
mmlimits Get the possible minimum and maximum of an image.
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