Leptonica 1.68
C Image Processing Library

Binary morphological (dwa) operations. More...
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Binary morphological (dwa) operations.
Binary morphological (dwa) ops with brick Sels PIX *pixDilateBrickDwa() PIX *pixErodeBrickDwa() PIX *pixOpenBrickDwa() PIX *pixCloseBrickDwa() Binary composite morphological (dwa) ops with brick Sels PIX *pixDilateCompBrickDwa() PIX *pixErodeCompBrickDwa() PIX *pixOpenCompBrickDwa() PIX *pixCloseCompBrickDwa() Binary extended composite morphological (dwa) ops with brick Sels PIX *pixDilateCompBrickExtendDwa() PIX *pixErodeCompBrickExtendDwa() PIX *pixOpenCompBrickExtendDwa() PIX *pixCloseCompBrickExtendDwa() l_int32 getExtendedCompositeParameters() These are higherlevel interfaces for dwa morphology with brick Sels. Because many morphological operations are performed using separable brick Sels, it is useful to have a simple interface for this. We have included all 58 of the brick Sels that are generated by selaAddBasic(). These are sufficient for all the decomposable bricks up to size 63, which is the limit for dwa Sels with origins at the center of the Sel. All three sets can be used as the basic interface for general brick operations. Here are the internal calling sequences: (1) If you try to apply a nondecomposable operation, such as pixErodeBrickDwa(), with a Sel size that doesn't exist, this calls a decomposable operation, pixErodeCompBrickDwa(), instead. This can differ in linear Sel size by up to 2 pixels from the request. (2) If either Sel brick dimension is greater than 63, the extended composite function is called. (3) The extended composite function calls the composite function a number of times with size 63, and once with size < 63. Because each operation with a size of 63 is done compositely with 7 x 9 (exactly 63), the net result is correct in length to within 2 pixels. For composite operations, both using a comb and extended (beyond 63), horizontal and vertical operations are composed separately and sequentially. We have also included use of all the 76 comb Sels that are generated by selaAddDwaCombs(). The generated code is in dwacomb.2.c and dwacomblow.2.c. These are used for the composite dwa brick operations. The noncomposite brick operations, such as pixDilateBrickDwa(), will call the associated composite operation in situations where the requisite brick Sel has not been compiled into fmorphgen*.1.c. If you want to use brick Sels that are not represented in the basic set of 58, you must generate the dwa code to implement them. You have three choices for how to use these: (1) Add both the new Sels and the dwa code to the library:  For simplicity, add your new brick Sels to those defined in selaAddBasic().  Recompile the library.  Make prog/fmorphautogen.  Run prog/fmorphautogen, to generate new versions of the dwa code in fmorphgen.1.c and fmorphgenlow.1.c.  Copy these two files to src.  Recompile the library again.  Use the new brick Sels in your program and compile it. (2) Make both the new Sels and dwa code outside the library, and link it directly to an executable:  Write a function to generate the new Sels in a Sela, and call fmorphautogen(sela, <N>, filename) to generate the code.  Compile your program that uses the newly generated function pixMorphDwa_<N>(), and link to the two new C files. (3) Make the new Sels in the library and use the dwa code outside it:  Add code in the library to generate your new brick Sels. (It is suggested that you NOT add these Sels to the selaAddBasic() function; write a new function that generates a new Sela.)  Recompile the library.  Write a small program that generates the Sela and calls fmorphautogen(sela, <N>, filename) to generate the code.  Compile your program that uses the newly generated function pixMorphDwa_<N>(), and link to the two new C files. As an example of this approach, see prog/dwamorph*_reg.c:  added selaAddDwaLinear() to sel2.c  wrote dwamorph1_reg.c, to generate the dwa code.  compiled and linked the generated code with the application, dwamorph2_reg.c. (Note: because this was a regression test, dwamorph1_reg also builds and runs the application program.)
Definition in file morphdwa.c.
#define DEBUG_SEL_LOOKUP 0 
Definition at line 124 of file morphdwa.c.
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement 2D brick Sels, using linear Sels generated with selaAddBasic(). (2) A brick Sel has hits for all elements. (3) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (4) Do separably if both hsize and vsize are > 1. (5) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (6) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (7) For clarity, if the case is known, use these patterns: (a) pixd = pixDilateBrickDwa(NULL, pixs, ...); (b) pixDilateBrickDwa(pixs, pixs, ...); (c) pixDilateBrickDwa(pixd, pixs, ...); (8) The size of pixd is determined by pixs. (9) If either linear Sel is not found, this calls the appropriate decomposible function.
Definition at line 162 of file morphdwa.c.
References ERROR_PTR, FALSE, FREE, L_INFO, L_MORPH_DILATE, NULL, pixAddBorder(), pixCopy(), pixDestroy(), pixDilateCompBrickDwa(), pixFMorphopGen_1(), pixGetDepth(), pixMorphDwa_1(), pixRemoveBorder(), pixTransferAllData(), PROCNAME, selaAddBasic(), selaDestroy(), selaGetBrickName(), and TRUE.
Referenced by DoComparisonDwa2(), DoComparisonDwa3(), main(), and pixMorphSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement 2D brick Sels, using linear Sels generated with selaAddBasic(). (2) A brick Sel has hits for all elements. (3) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (4) Do separably if both hsize and vsize are > 1. (5) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (6) Note that we must always set or clear the border pixels before each operation, depending on the the b.c. (symmetric or asymmetric). (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixErodeBrickDwa(NULL, pixs, ...); (b) pixErodeBrickDwa(pixs, pixs, ...); (c) pixErodeBrickDwa(pixd, pixs, ...); (9) The size of the result is determined by pixs. (10) If either linear Sel is not found, this calls the appropriate decomposible function.
Definition at line 264 of file morphdwa.c.
References ERROR_PTR, FALSE, FREE, L_INFO, L_MORPH_ERODE, NULL, pixAddBorder(), pixCopy(), pixDestroy(), pixErodeCompBrickDwa(), pixFMorphopGen_1(), pixGetDepth(), pixMorphDwa_1(), pixRemoveBorder(), pixTransferAllData(), PROCNAME, selaAddBasic(), selaDestroy(), selaGetBrickName(), and TRUE.
Referenced by DoComparisonDwa2(), DoComparisonDwa3(), main(), and pixMorphSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement 2D brick Sels, using linear Sels generated with selaAddBasic(). (2) A brick Sel has hits for all elements. (3) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (4) Do separably if both hsize and vsize are > 1. (5) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (6) Note that we must always set or clear the border pixels before each operation, depending on the the b.c. (symmetric or asymmetric). (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixOpenBrickDwa(NULL, pixs, ...); (b) pixOpenBrickDwa(pixs, pixs, ...); (c) pixOpenBrickDwa(pixd, pixs, ...); (9) The size of the result is determined by pixs. (10) If either linear Sel is not found, this calls the appropriate decomposible function.
Definition at line 366 of file morphdwa.c.
References ERROR_PTR, FALSE, FREE, L_INFO, L_MORPH_DILATE, L_MORPH_ERODE, L_MORPH_OPEN, NULL, pixAddBorder(), pixCopy(), pixDestroy(), pixFMorphopGen_1(), pixGetDepth(), pixOpenCompBrickDwa(), pixRemoveBorder(), pixTransferAllData(), PROCNAME, selaAddBasic(), selaDestroy(), selaGetBrickName(), and TRUE.
Referenced by DoComparisonDwa2(), DoComparisonDwa3(), main(), and pixMorphSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) This is a 'safe' closing; we add an extra border of 32 OFF pixels for the standard asymmetric b.c. (2) These implement 2D brick Sels, using linear Sels generated with selaAddBasic(). (3) A brick Sel has hits for all elements. (4) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (5) Do separably if both hsize and vsize are > 1. (6) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (7) Note that we must always set or clear the border pixels before each operation, depending on the the b.c. (symmetric or asymmetric). (8) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (9) For clarity, if the case is known, use these patterns: (a) pixd = pixCloseBrickDwa(NULL, pixs, ...); (b) pixCloseBrickDwa(pixs, pixs, ...); (c) pixCloseBrickDwa(pixd, pixs, ...); (10) The size of the result is determined by pixs. (11) If either linear Sel is not found, this calls the appropriate decomposible function.
Definition at line 473 of file morphdwa.c.
References ERROR_PTR, FALSE, FREE, getMorphBorderPixelColor(), L_INFO, L_MORPH_CLOSE, L_MORPH_DILATE, L_MORPH_ERODE, NULL, pixAddBorder(), pixCloseCompBrickDwa(), pixCopy(), pixDestroy(), pixFMorphopGen_1(), pixGetDepth(), pixRemoveBorder(), pixTransferAllData(), PROCNAME, selaAddBasic(), selaDestroy(), selaGetBrickName(), and TRUE.
Referenced by DoComparisonDwa2(), DoComparisonDwa3(), main(), and pixMorphSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement a separable composite dilation with 2D brick Sels. (2) For efficiency, it may decompose each linear morphological operation into two (brick + comb). (3) A brick Sel has hits for all elements. (4) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (5) Do separably if both hsize and vsize are > 1. (6) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixDilateCompBrickDwa(NULL, pixs, ...); (b) pixDilateCompBrickDwa(pixs, pixs, ...); (c) pixDilateCompBrickDwa(pixd, pixs, ...); (9) The size of pixd is determined by pixs. (10) CAUTION: both hsize and vsize are being decomposed. The decomposer chooses a product of sizes (call them 'terms') for each that is close to the input size, but not necessarily equal to it. It attempts to optimize: (a) for consistency with the input values: the product of terms is close to the input size (b) for efficiency of the operation: the sum of the terms is small; ideally about twice the square root of the input size. So, for example, if the input hsize = 37, which is a prime number, the decomposer will break this into two terms, 6 and 6, so that the net result is a dilation with hsize = 36.
Definition at line 600 of file morphdwa.c.
References ERROR_PTR, FREE, getCompositeParameters(), L_MORPH_DILATE, NULL, pixAddBorder(), pixCopy(), pixDestroy(), pixDilateCompBrickExtendDwa(), pixFMorphopGen_1(), pixFMorphopGen_2(), pixGetDepth(), pixRemoveBorder(), pixTransferAllData(), and PROCNAME.
Referenced by DoComparisonDwa3(), DoComparisonDwa4(), DoComparisonDwa5(), main(), pixDilateBrickDwa(), pixDilateCompBrickExtendDwa(), and pixMorphCompSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement a separable composite erosion with 2D brick Sels. (2) For efficiency, it may decompose each linear morphological operation into two (brick + comb). (3) A brick Sel has hits for all elements. (4) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (5) Do separably if both hsize and vsize are > 1. (6) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixErodeCompBrickDwa(NULL, pixs, ...); (b) pixErodeCompBrickDwa(pixs, pixs, ...); (c) pixErodeCompBrickDwa(pixd, pixs, ...); (9) The size of pixd is determined by pixs. (10) CAUTION: both hsize and vsize are being decomposed. The decomposer chooses a product of sizes (call them 'terms') for each that is close to the input size, but not necessarily equal to it. It attempts to optimize: (a) for consistency with the input values: the product of terms is close to the input size (b) for efficiency of the operation: the sum of the terms is small; ideally about twice the square root of the input size. So, for example, if the input hsize = 37, which is a prime number, the decomposer will break this into two terms, 6 and 6, so that the net result is a dilation with hsize = 36.
Definition at line 733 of file morphdwa.c.
References ERROR_PTR, FREE, getCompositeParameters(), getMorphBorderPixelColor(), L_MORPH_ERODE, NULL, pixAddBorder(), pixCopy(), pixDestroy(), pixErodeCompBrickExtendDwa(), pixFMorphopGen_1(), pixFMorphopGen_2(), pixGetDepth(), pixRemoveBorder(), pixTransferAllData(), and PROCNAME.
Referenced by DoComparisonDwa3(), DoComparisonDwa4(), DoComparisonDwa5(), main(), pixErodeBrickDwa(), pixErodeCompBrickExtendDwa(), and pixMorphCompSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) These implement a separable composite opening with 2D brick Sels. (2) For efficiency, it may decompose each linear morphological operation into two (brick + comb). (3) A brick Sel has hits for all elements. (4) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (5) Do separably if both hsize and vsize are > 1. (6) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixOpenCompBrickDwa(NULL, pixs, ...); (b) pixOpenCompBrickDwa(pixs, pixs, ...); (c) pixOpenCompBrickDwa(pixd, pixs, ...); (9) The size of pixd is determined by pixs. (10) CAUTION: both hsize and vsize are being decomposed. The decomposer chooses a product of sizes (call them 'terms') for each that is close to the input size, but not necessarily equal to it. It attempts to optimize: (a) for consistency with the input values: the product of terms is close to the input size (b) for efficiency of the operation: the sum of the terms is small; ideally about twice the square root of the input size. So, for example, if the input hsize = 37, which is a prime number, the decomposer will break this into two terms, 6 and 6, so that the net result is a dilation with hsize = 36.
Definition at line 862 of file morphdwa.c.
References ERROR_PTR, FREE, getCompositeParameters(), getMorphBorderPixelColor(), L_MORPH_DILATE, L_MORPH_ERODE, NULL, PIX_CLR, pixAddBorder(), pixCopy(), pixDestroy(), pixFMorphopGen_1(), pixFMorphopGen_2(), pixGetDepth(), pixOpenCompBrickExtendDwa(), pixRemoveBorder(), pixSetOrClearBorder(), pixTransferAllData(), and PROCNAME.
Referenced by DoComparisonDwa3(), DoComparisonDwa4(), DoComparisonDwa5(), main(), pixMorphCompSequenceDwa(), and pixOpenBrickDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) This implements a separable composite safe closing with 2D brick Sels. (2) For efficiency, it may decompose each linear morphological operation into two (brick + comb). (3) A brick Sel has hits for all elements. (4) The origin of the Sel is at (x, y) = (hsize/2, vsize/2) (5) Do separably if both hsize and vsize are > 1. (6) It is necessary that both horizontal and vertical Sels of the input size are defined in the basic sela. (7) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (8) For clarity, if the case is known, use these patterns: (a) pixd = pixCloseCompBrickDwa(NULL, pixs, ...); (b) pixCloseCompBrickDwa(pixs, pixs, ...); (c) pixCloseCompBrickDwa(pixd, pixs, ...); (9) The size of pixd is determined by pixs. (10) CAUTION: both hsize and vsize are being decomposed. The decomposer chooses a product of sizes (call them 'terms') for each that is close to the input size, but not necessarily equal to it. It attempts to optimize: (a) for consistency with the input values: the product of terms is close to the input size (b) for efficiency of the operation: the sum of the terms is small; ideally about twice the square root of the input size. So, for example, if the input hsize = 37, which is a prime number, the decomposer will break this into two terms, 6 and 6, so that the net result is a dilation with hsize = 36.
Definition at line 1034 of file morphdwa.c.
References ERROR_PTR, FREE, getCompositeParameters(), getMorphBorderPixelColor(), L_MORPH_CLOSE, L_MORPH_DILATE, L_MORPH_ERODE, NULL, PIX_SET, pixAddBorder(), pixCloseCompBrickExtendDwa(), pixCopy(), pixDestroy(), pixFMorphopGen_1(), pixFMorphopGen_2(), pixGetDepth(), pixRemoveBorder(), pixSetOrClearBorder(), pixTransferAllData(), and PROCNAME.
Referenced by DoComparisonDwa3(), DoComparisonDwa4(), DoComparisonDwa5(), main(), pixCloseBrickDwa(), and pixMorphCompSequenceDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) Ankur Jain suggested and implemented extending the composite DWA operations beyond the 63 pixel limit. This is a simplified and approximate implementation of the extension. This allows arbitrary Dwa morph operations using brick Sels, by decomposing the horizontal and vertical dilations into a sequence of 63element dilations plus a dilation of size between 3 and 62. (2) The 63element dilations are exact, whereas the extra dilation is approximate, because the underlying decomposition is in pixDilateCompBrickDwa(). See there for further details. (3) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (4) There is no need to call this directly: pixDilateCompBrickDwa() calls this function if either brick dimension exceeds 63.
Definition at line 1187 of file morphdwa.c.
References ERROR_PTR, getExtendedCompositeParameters(), NULL, pixClone(), pixCreateTemplateNoInit(), pixDestroy(), pixDilateCompBrickDwa(), pixGetDepth(), pixTransferAllData(), and PROCNAME.
Referenced by pixCloseCompBrickExtendDwa(), pixDilateCompBrickDwa(), and pixOpenCompBrickExtendDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
Notes: (1) See pixDilateCompBrickExtendDwa() for usage. (2) There is no need to call this directly: pixErodeCompBrickDwa() calls this function if either brick dimension exceeds 63.
Definition at line 1309 of file morphdwa.c.
References ERROR_PTR, getExtendedCompositeParameters(), NULL, pixClone(), pixCreateTemplateNoInit(), pixDestroy(), pixErodeCompBrickDwa(), pixGetDepth(), pixTransferAllData(), and PROCNAME.
Referenced by pixCloseCompBrickExtendDwa(), pixErodeCompBrickDwa(), and pixOpenCompBrickExtendDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
(1) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (2) There is no need to call this directly: pixOpenCompBrickDwa() calls this function if either brick dimension exceeds 63.
Definition at line 1433 of file morphdwa.c.
References ERROR_PTR, NULL, pixDestroy(), pixDilateCompBrickExtendDwa(), pixErodeCompBrickExtendDwa(), pixGetDepth(), and PROCNAME.
Referenced by pixOpenCompBrickDwa().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs (1 bpp) hsize (width of brick Sel) vsize (height of brick Sel) Return: pixd
(1) There are three cases: (a) pixd == null (result into new pixd) (b) pixd == pixs (inplace; writes result back to pixs) (c) pixd != pixs (puts result into existing pixd) (2) There is no need to call this directly: pixCloseCompBrickDwa() calls this function if either brick dimension exceeds 63.
Definition at line 1474 of file morphdwa.c.
References ERROR_PTR, getMorphBorderPixelColor(), L_MORPH_ERODE, NULL, pixAddBorderGeneral(), pixDestroy(), pixDilateCompBrickExtendDwa(), pixErodeCompBrickExtendDwa(), pixGetDepth(), pixRemoveBorderGeneral(), pixTransferAllData(), and PROCNAME.
Referenced by pixCloseCompBrickDwa().
l_int32 getExtendedCompositeParameters  (  l_int32  size, 
l_int32 *  pn,  
l_int32 *  pextra,  
l_int32 *  pactualsize  
) 
getExtendedCompositeParameters()
Input: size (of linear Sel) &pn (<return> number of 63 wide convolutions) &pextra (<return> size of extra Sel) &actualsize (<optional return>=""> actual size used in operation) Return: 0 if OK, 1 on error
Notes: (1) The DWA implementation allows Sels to be used with hits up to 31 pixels from the origin, either horizontally or vertically. Larger Sels can be used if decomposed into a set of operations with Sels not exceeding 63 pixels in either width or height (and with the origin as close to the center of the Sel as possible). (2) This returns the decomposition of a linear Sel of length into a set of
Sels of length 63 plus an extra Sel of length . (3) For notation, let w == , n ==
, and e == . We have 1 < e < 63.
Then if w < 64, we have n = 0 and e = w. The general formula for w > 63 is: w = 63 + (n  1) * 62 + (e  1)
Where did this come from? Each successive convolution with a Sel of length L adds a total length (L  1) to w. This accounts for using 62 for each additional Sel of size 63, and using (e  1) for the additional Sel of size e.
Solving for n and e for w > 63: n = 1 + Int((w  63) / 62) e = w  63  (n  1) * 62 + 1
The extra part is decomposed into two factors f1 and f2, and the actual size of the extra part is e' = f1 * f2 Then the actual width is: w' = 63 + (n  1) * 62 + f1 * f2  1
Definition at line 1561 of file morphdwa.c.
References ERROR_INT, L_MIN, PROCNAME, and selectComposableSizes().
Referenced by main(), pixDilateCompBrickExtendDwa(), and pixErodeCompBrickExtendDwa().