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writeEncodedTile

Write data to specified tile

Description

example

writeEncodedTile(t,tileNumber,imageData) writes the data in imageData to the tile specified by tileNumber to the TIFF file associated with the Tiff object t.

example

writeEncodedTile(t,tileNumber,Y,Cb,Cr) writes the YCbCr component data to the tile specified by tileNumber to the TIFF file associated with the Tiff object t. To use this syntax, you must set the YCbCrSubSampling tag.

Examples

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Read two tiles from a TIFF file and write them to a new TIFF file in different positions.

Open a TIFF file with image data in tiled layout, get the image data and the number of tiles in the image.

tr = Tiff('peppers_RGB_tiled.tif','r');
imageR = read(tr);
nTiles = numberOfTiles(tr)
nTiles = 36

Read the 8th and 29th tiles of the image.

tile8 = readEncodedTile(tr,8);
tile29 = readEncodedTile(tr,29);

Create a Tiff object for a new file and copy the image and tag information from the first file.

tw = Tiff('write_tile.tif','w');
tagstruct.ImageLength = getTag(tr,'ImageLength');
tagstruct.ImageWidth =  getTag(tr,'ImageWidth');
tagstruct.Photometric = getTag(tr,'Photometric');
tagstruct.TileLength = getTag(tr,'TileLength');
tagstruct.TileWidth = getTag(tr,'TileWidth');
tagstruct.BitsPerSample = getTag(tr,'BitsPerSample');
tagstruct.SamplesPerPixel = getTag(tr,'SamplesPerPixel');
tagstruct.PlanarConfiguration = getTag(tr,'PlanarConfiguration');  
setTag(tw,tagstruct); 
write(tw,imageR)

Write tile29 in the position for tile number 8 and tile8 in the position for tile number 29.

writeEncodedTile(tw,8,tile29);
writeEncodedTile(tw,29,tile8);

Read and display the new image next to the original image.

imageW = read(tw);
subplot(121);
imshow(imageR); 
title('Original Image')
subplot(122);
imshow(imageW); 
title('Tiles Shuffled Image')

Close the Tiff objects.

close(tr);
close(tw);

Read two tiles from a YCbCr TIFF file and write them to a new TIFF file in different positions.

Open a TIFF file with image data in tiled layout, get the image data and the number of tiles in the image.

tr = Tiff('peppers_YCbCr_tiled.tif','r');
[Yr,Cbr,Crr] = read(tr);
nTiles = numberOfTiles(tr)
nTiles = 36

Read the 8th and 29th tiles of the image.

[Y8,Cb8,Cr8] = readEncodedTile(tr,8);
[Y29,Cb29,Cr29] = readEncodedTile(tr,29);

Create a Tiff object for a new file and copy the image and tag information from the first file.

tw = Tiff('write_tile.tif','w');
tagstruct.ImageLength = getTag(tr,'ImageLength');
tagstruct.ImageWidth =  getTag(tr,'ImageWidth');
tagstruct.SampleFormat = getTag(tr,'SampleFormat');
tagstruct.Photometric = getTag(tr,'Photometric');
tagstruct.TileLength = getTag(tr,'TileLength');
tagstruct.TileWidth = getTag(tr,'TileWidth');
tagstruct.BitsPerSample = getTag(tr,'BitsPerSample');
tagstruct.SamplesPerPixel = getTag(tr,'SamplesPerPixel');
tagstruct.YCbCrSubSampling = getTag(tr,'YCbCrSubSampling');
tagstruct.Compression = getTag(tr,'Compression');
tagstruct.PlanarConfiguration = getTag(tr,'PlanarConfiguration');  
setTag(tw,tagstruct); 
write(tw,Yr,Cbr,Crr)

Write tile number 29 in the position for tile number 8 and tile number 8 in the position for tile number 29.

writeEncodedTile(tw,8,Y29,Cb29,Cr29);
writeEncodedTile(tw,29,Y8,Cb8,Cr8);

Read and display the Y component of the new image next to the original image.

[Yw,Crw,Cbw] = read(tw);
subplot(121);
imshow(Yr); 
title('Original Image (Y)')
subplot(122);
imshow(Yw); 
title('Tiles Shuffled Image (Y)')

Close the Tiff objects.

close(tr);
close(tw);

Input Arguments

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Tiff object representing a TIFF file. Use the Tiff function to create the object.

Tile number, specified as a positive integer. Tile numbers are one-based numbers.

Example: 15

Data Types: double

Image data, specified as a numeric array.

  • If imageData has fewer number of bytes than the size of the tile, then writeEncodedTile silently pads the tile.

  • If imageData has more bytes than the size of the tile, then writeEncodedTile issues a warning and truncates the data.

To see the size of the image tile, get the values of the TileLength and TileWidth tags.

Data Types: double

Luma component of the image tile, specified as a two-dimensional numeric array.

Data Types: double

Blue-difference chroma component of the image tile, specified as a two-dimensional numeric array.

Data Types: double

Red-difference chroma component of the image tile, specified as a two-dimensional numeric array.

Data Types: double

Algorithms

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References

This function corresponds to the TIFFWriteEncodedTile function in the LibTIFF C API. To use this function, you must be familiar with the TIFF specification and technical notes. View this documentation at LibTIFF - TIFF Library and Utilities.

Introduced in R2009b