Functions
>
Image Processing
>
Combinations of Images
>
Example: Replacing a Part of an Image
Example: Replacing a Part of an Image
Use the
putregion
function to insert matrix
N
into matrix
M
at position
(row, col)
. Matrix
M
must be large enough to contain all of
N
when inserted at the given position.
For information on using this example, refer to
About Image Processing Examples
.
1.
Read in a starting image.
<region id="ID0EVMZW" top="144" left="24" height="21.2" width="196.246666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">R</id> <apply> <id>READ_IMAGE</id> <str xml:space="preserve">camera.bmp</str> </apply> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EFNZW" top="168" left="24" height="21.2" width="88.5783333333333" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>rows</id> <id>R</id> </apply> <result> <real>256</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EVNZW" top="168" left="144" height="21.2" width="83.4416666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>cols</id> <id>R</id> </apply> <result> <real>256</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
2.
Create a second image, smaller than the first.
<region id="ID0EGPZW" top="240" left="24" height="21.2" width="340.846666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">N</id> <apply> <id>submatrix</id> <sequence> <apply> <id>READ_IMAGE</id> <str xml:space="preserve">mona.bmp</str> </apply> <real>70</real> <real>100</real> <real>60</real> <real>140</real> </sequence> </apply> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EWPZW" top="264" left="24" height="21.2" width="54.06" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">col</id> <real>170</real> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EGQZW" top="288" left="24" height="21.2" width="53.2133333333333" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">row</id> <real>90</real> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EWQZW" top="312" left="24" height="21.2" width="78.285" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>cols</id> <id>N</id> </apply> <result> <real>81</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EGRZW" top="336" left="24" height="21.2" width="83.4216666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>rows</id> <id>N</id> </apply> <result> <real>31</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
Make sure that
<region id="ID0E1RZW" top="408" left="24" height="21.2" width="128.798333333333" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <minus /> <apply> <plus /> <id>col</id> <apply> <id>cols</id> <id>N</id> </apply> </apply> <real>1</real> </apply> <result> <real>250</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
is less than
<region id="ID0EHSZW" top="408" left="264" height="21.2" width="83.4416666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>cols</id> <id>R</id> </apply> <result> <real>256</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0EXSZW" top="432" left="24" height="21.2" width="139.071666666667" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <minus /> <apply> <plus /> <id>row</id> <apply> <id>rows</id> <id>N</id> </apply> </apply> <real>1</real> </apply> <result> <real>120</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
is less than
<region id="ID0EETZW" top="432" left="264" height="21.2" width="88.5783333333333" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <eval xmlns="http://schemas.mathsoft.com/math50"> <apply> <id>rows</id> <id>R</id> </apply> <result> <real>256</real> </result> </eval> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
3.
Insert matrix
N
into
M
and view the resulting image:
<region id="ID0E4UZW" top="504" left="24" height="21.2" width="165.43" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">C</id> <apply> <id>putregion</id> <sequence> <id>R</id> <id>N</id> <id>row</id> <id>col</id> </sequence> </apply> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
<region id="ID0ENVZW" top="528" left="24" height="21.2" width="292.903333333333" xmlns="http://schemas.mathsoft.com/worksheet50"> <math> <define xmlns="http://schemas.mathsoft.com/math50"> <id label="None">DummyC</id> <apply> <id>WRITEBMP</id> <sequence> <str xml:space="preserve">mona_in_camera.bmp</str> <id>C</id> </sequence> </apply> </define> <resultFormat> <decimal precision="round-trip-decimal-places" show-trailing-zeros="false" radix="dec" imaginary-value="i" /> <matrix size="12,12" offset="0,0" /> </resultFormat> </math> </region>
(camera.bmp)
(mona_in_camera.bmp)
Copy Expressions
is less than 
is less than 
