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Leptonica 1.68
C Image Processing Library
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Leptonica 1.68
C Image Processing Library
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Masking and logical ops, counting, mirrored tiling. More...
Go to the source code of this file.
Masking and logical ops, counting, mirrored tiling.
This file has these operations:
(1) Mask-directed operations
(2) Full-image bit-logical operations
(3) Foreground pixel counting operations on 1 bpp images
(4) Sum of pixel values
(5) Mirrored tiling of a smaller image
Masked operations
l_int32 pixSetMasked()
l_int32 pixSetMaskedGeneral()
l_int32 pixCombineMasked()
l_int32 pixCombineMaskedGeneral()
l_int32 pixPaintThroughMask()
PIX *pixPaintSelfThroughMask()
PIX *pixMakeMaskFromLUT()
PIX *pixSetUnderTransparency()
One and two-image boolean operations on arbitrary depth images
PIX *pixInvert()
PIX *pixOr()
PIX *pixAnd()
PIX *pixXor()
PIX *pixSubtract()
Foreground pixel counting in 1 bpp images
l_int32 pixZero()
l_int32 pixCountPixels()
NUMA *pixaCountPixels()
l_int32 pixCountPixelsInRow()
NUMA *pixCountPixelsByRow()
NUMA *pixCountPixelsByColumn()
NUMA *pixSumPixelsByRow()
NUMA *pixSumPixelsByColumn()
l_int32 pixThresholdPixelSum()
l_int32 *makePixelSumTab8()
l_int32 *makePixelCentroidTab8()
Sum of pixel values
l_int32 pixSumPixelValues()
Mirrored tiling
PIX *pixMirroredTiling()
Static helper function
static l_int32 findTilePatchCenter()
Definition in file pix3.c.
| static l_int32 findTilePatchCenter | ( | PIX * | pixs, |
| BOX * | box, | ||
| l_int32 | searchdir, | ||
| l_uint32 | targdist, | ||
| l_uint32 * | pdist, | ||
| l_int32 * | pxc, | ||
| l_int32 * | pyc | ||
| ) | [static] |
Input: pixs (8 or 16 bpp; distance function of a binary mask) box (region of pixs to search around) searchdir (L_HORIZ or L_VERT; direction to search) targdist (desired distance of selected patch center from fg) &dist (<return> actual distance of selected location) &xc, &yc (<return> location of selected patch center) Return: 0 if OK, 1 on error
Notes: (1) This looks for a patch of non-masked image, that is outside but near the input box. The input pixs is a distance function giving the distance from the fg in a binary mask. (2) The target distance implicitly specifies a desired size for the patch. The location of the center of the patch, and the actual distance from fg are returned. (3) If the target distance is larger than 255, a 16-bit distance transform is input. (4) It is assured that a square centered at (xc, yc) and of size 'dist' will not intersect with the fg of the binary mask that was used to generate pixs. (5) We search away from the component, in approximately the center 1/3 of its dimension. This gives a better chance of finding patches that are close to the component.
Definition at line 2061 of file pix3.c.
References boxGetGeometry(), ERROR_INT, L_HORIZ, NULL, pixGetDimensions(), pixGetPixel(), and PROCNAME.
Referenced by pixPaintSelfThroughMask().
Input: pixd (1, 2, 4, 8, 16 or 32 bpp; or colormapped) pixm (<optional> 1 bpp mask; no operation if NULL) val (value to set at each masked pixel) Return: 0 if OK; 1 on error
Notes: (1) In-place operation. (2) NOTE: For cmapped images, this calls pixSetMaskedCmap(). must be the 32-bit color representation of the RGB pixel. It is not the index into the colormap! (2) If pixm == NULL, a warning is given. (3) This is an implicitly aligned operation, where the UL corners of pixd and pixm coincide. A warning is issued if the two image sizes differ significantly, but the operation proceeds. (4) Each pixel in pixd that co-locates with an ON pixel in pixm is set to the specified input value. Other pixels in pixd are not changed. (5) You can visualize this as painting the color through the mask, as a stencil. (6) If you do not want to have the UL corners aligned, use the function pixSetMaskedGeneral(), which requires you to input the UL corner of pixm relative to pixd. (7) Implementation details: see comments in pixPaintThroughMask() for when we use rasterop to do the painting.
Definition at line 115 of file pix3.c.
References ERROR_INT, extractRGBValues(), GET_DATA_BIT, L_ABS, L_MIN, L_WARNING, NULL, PIX_MASK, PIX_PAINT, pixDestroy(), pixGetColormap(), pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), pixInvert(), pixRasterop(), pixSetMaskedCmap(), pixUnpackBinary(), PROCNAME, SET_DATA_BYTE, SET_DATA_DIBIT, SET_DATA_QBIT, and SET_DATA_TWO_BYTES.
Referenced by pixColorSegmentClean(), pixColorSegmentRemoveColors(), pixColorsForQuantization(), pixDistanceFunction(), pixSeedfillGrayBasin(), pixSeedspread(), pixSetUnderTransparency(), pixSnapColorCmap(), pixWriteSegmentedPageToPS(), and TestDistance().
Input: pixd (8, 16 or 32 bpp) pixm (<optional> 1 bpp mask; no operation if null) val (value to set at each masked pixel) x, y (location of UL corner of pixm relative to pixd; can be negative) Return: 0 if OK; 1 on error
Notes: (1) This is an in-place operation. (2) Alignment is explicit. If you want the UL corners of the two images to be aligned, use pixSetMasked(). (3) A typical use would be painting through the foreground of a small binary mask pixm, located somewhere on a larger pixd. Other pixels in pixd are not changed. (4) You can visualize this as painting the color through the mask, as a stencil. (5) This uses rasterop to handle clipping and different depths of pixd. (6) If pixd has a colormap, you should call pixPaintThroughMask(). (7) Why is this function here, if pixPaintThroughMask() does the same thing, and does it more generally? I've retained it here to show how one can paint through a mask using only full image rasterops, rather than pixel peeking in pixm and poking in pixd. It's somewhat baroque, but I found it amusing.
Definition at line 252 of file pix3.c.
References ERROR_INT, NULL, PIX_DST, PIX_SRC, pixAnd(), pixCreateTemplate(), pixDestroy(), pixGetDepth(), pixGetDimensions(), pixInvert(), pixRasterop(), pixSetAllArbitrary(), pixUnpackBinary(), and PROCNAME.
Referenced by kernelDisplayInPix(), and main().
Input: pixd (1 bpp, 8 bpp gray or 32 bpp rgb; no cmap) pixs (1 bpp, 8 bpp gray or 32 bpp rgb; no cmap) pixm (<optional> 1 bpp mask; no operation if NULL) Return: 0 if OK; 1 on error
Notes: (1) In-place operation; pixd is changed. (2) This sets each pixel in pixd that co-locates with an ON pixel in pixm to the corresponding value of pixs. (3) pixs and pixd must be the same depth and not colormapped. (4) All three input pix are aligned at the UL corner, and the operation is clipped to the intersection of all three images. (5) If pixm == NULL, it's a no-op. (6) Implementation: see notes in pixCombineMaskedGeneral(). For 8 bpp selective masking, you might guess that it would be faster to generate an 8 bpp version of pixm, using pixConvert1To8(pixm, 0, 255), and then use a general combine operation d = (d & ~m) | (s & m) on a word-by-word basis. Not always. The word-by-word combine takes a time that is independent of the mask data. If the mask is relatively sparse, the byte-check method is actually faster!
Definition at line 328 of file pix3.c.
References ERROR_INT, GET_DATA_BIT, GET_DATA_BYTE, L_MIN, NULL, PIX_DST, PIX_NOT, PIX_SRC, pixAnd(), pixDestroy(), pixGetColormap(), pixGetData(), pixGetDimensions(), pixGetWpl(), pixRasterop(), PROCNAME, and SET_DATA_BYTE.
Referenced by main(), pixMaskedThreshOnBackgroundNorm(), pixMorphSequenceMasked(), pixThresholdSpreadNorm(), QuantizeNonImageRegion(), and wshedRenderColors().
Input: pixd (1 bpp, 8 bpp gray or 32 bpp rgb) pixs (1 bpp, 8 bpp gray or 32 bpp rgb) pixm (<optional> 1 bpp mask) x, y (origin of pixs and pixm relative to pixd; can be negative) Return: 0 if OK; 1 on error
Notes: (1) In-place operation; pixd is changed. (2) This is a generalized version of pixCombinedMasked(), where the source and mask can be placed at the same (arbitrary) location relative to pixd. (3) pixs and pixd must be the same depth and not colormapped. (4) The UL corners of both pixs and pixm are aligned with the point (x, y) of pixd, and the operation is clipped to the intersection of all three images. (5) If pixm == NULL, it's a no-op. (6) Implementation. There are two ways to do these. In the first, we use rasterop, ORing the part of pixs under the mask with pixd (which has been appropriately cleared there first). In the second, the mask is used one pixel at a time to selectively replace pixels of pixd with those of pixs. Here, we use rasterop for 1 bpp and pixel-wise replacement for 8 and 32 bpp. To use rasterop for 8 bpp, for example, we must first generate an 8 bpp version of the mask. The code is simple:
Pix *pixm8 = pixConvert1To8(NULL, pixm, 0, 255); Pix *pixt = pixAnd(NULL, pixs, pixm8); pixRasterop(pixd, x, y, wmin, hmin, PIX_DST & PIX_NOT(PIX_SRC), pixm8, 0, 0); pixRasterop(pixd, x, y, wmin, hmin, PIX_SRC | PIX_DST, pixt, 0, 0); pixDestroy(&pixt); pixDestroy(&pixm8);
Definition at line 446 of file pix3.c.
References ERROR_INT, GET_DATA_BIT, GET_DATA_BYTE, L_MIN, NULL, PIX_DST, PIX_NOT, PIX_SRC, pixAnd(), pixDestroy(), pixGetColormap(), pixGetData(), pixGetDimensions(), pixGetWpl(), pixRasterop(), PROCNAME, and SET_DATA_BYTE.
Referenced by main(), and pixPaintSelfThroughMask().
Input: pixd (1, 2, 4, 8, 16 or 32 bpp; or colormapped) pixm (<optional> 1 bpp mask) x, y (origin of pixm relative to pixd; can be negative) val (pixel value to set at each masked pixel) Return: 0 if OK; 1 on error
Notes: (1) In-place operation. Calls pixSetMaskedCmap() for colormapped images. (2) For 1, 2, 4, 8 and 16 bpp gray, we take the appropriate number of least significant bits of val. (3) If pixm == NULL, it's a no-op. (4) The mask origin is placed at (x,y) on pixd, and the operation is clipped to the intersection of rectangles. (5) For rgb, the components in val are in the canonical locations, with red in location COLOR_RED, etc. (6) Implementation detail 1: For painting with val == 0 or val == maxval, you can use rasterop. If val == 0, invert the mask so that it's 0 over the region into which you want to write, and use PIX_SRC & PIX_DST to clear those pixels. To write with val = maxval (all 1's), use PIX_SRC | PIX_DST to set all bits under the mask. (7) Implementation detail 2: The rasterop trick can be used for depth > 1 as well. For val == 0, generate the mask for depth d from the binary mask using pixmd = pixUnpackBinary(pixm, d, 1); and use pixRasterop() with PIX_MASK. For val == maxval, pixmd = pixUnpackBinary(pixm, d, 0); and use pixRasterop() with PIX_PAINT. But note that if d == 32 bpp, it is about 3x faster to use the general implementation (not pixRasterop()). (8) Implementation detail 3: It might be expected that the switch in the inner loop will cause large branching delays and should be avoided. This is not the case, because the entrance is always the same and the compiler can correctly predict the jump.
Definition at line 569 of file pix3.c.
References ERROR_INT, extractRGBValues(), GET_DATA_BIT, NULL, PIX_MASK, PIX_PAINT, pixDestroy(), pixGetColormap(), pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), pixInvert(), pixRasterop(), pixSetMaskedCmap(), pixUnpackBinary(), PROCNAME, SET_DATA_BYTE, SET_DATA_DIBIT, SET_DATA_QBIT, and SET_DATA_TWO_BYTES.
Referenced by kernelDisplayInPix(), main(), pixClipMasked(), pixDisplayDiffBinary(), pixSetTextline(), pixSmoothConnectedRegions(), selaAddCrossJunctions(), selaAddTJunctions(), and wshedRenderFill().
| l_int32 pixPaintSelfThroughMask | ( | PIX * | pixd, |
| PIX * | pixm, | ||
| l_int32 | x, | ||
| l_int32 | y, | ||
| l_int32 | tilesize, | ||
| l_int32 | searchdir | ||
| ) |
Input: pixd (8 bpp gray or 32 bpp rgb; not colormapped) pixm (1 bpp mask) x, y (origin of pixm relative to pixd; must not be negative) tilesize (requested size for tiling) searchdir (L_HORIZ, L_VERT) Return: 0 if OK; 1 on error
Notes: (1) In-place operation; pixd is changed. (2) If pixm == NULL, it's a no-op. (3) The mask origin is placed at (x,y) on pixd, and the operation is clipped to the intersection of pixd and the fg of the mask. (4) The tilesize is the the requested size for tiling. The actual size for each c.c. will be bounded by the minimum dimension of the c.c. and the distance at which the tile center is located. (5) searchdir is the direction with respect to the b.b. of each mask component, from which the square patch is chosen and tiled onto the image, clipped by the mask component. (6) Specifically, a mirrored tiling, generated from pixd, is used to construct the pixels that are painted onto pixd through pixm.
Definition at line 703 of file pix3.c.
References boxaDestroy(), boxCreate(), boxDestroy(), boxGetGeometry(), ERROR_INT, findTilePatchCenter(), L_BOUNDARY_BG, L_CLONE, L_HORIZ, L_MAX, L_MIN, L_VERT, L_WARNING, NULL, PIX_SRC, pixaDestroy(), pixaGetBox(), pixaGetCount(), pixaGetPix(), pixClipRectangle(), pixCombineMaskedGeneral(), pixConnComp(), pixCopy(), pixCreate(), pixDestroy(), pixDistanceFunction(), pixGetColormap(), pixGetDimensions(), pixInvert(), pixMirroredTiling(), pixRasterop(), and PROCNAME.
Input: pixs (2, 4 or 8 bpp; can be colormapped) tab (256-entry LUT; 1 means to write to mask) Return: pixd (1 bpp mask), or null on error
Notes: (1) This generates a 1 bpp mask image, where a 1 is written in the mask for each pixel in pixs that has a value corresponding to a 1 in the LUT. (2) The LUT should be of size 256.
Definition at line 821 of file pix3.c.
References ERROR_PTR, GET_DATA_BYTE, GET_DATA_DIBIT, GET_DATA_QBIT, NULL, pixCreate(), pixGetData(), pixGetDimensions(), pixGetWpl(), PROCNAME, and SET_DATA_BIT.
Referenced by pixColorSegmentRemoveColors(), and pixSnapColorCmap().
Input: pixs (32 bpp rgba) val (32 bit unsigned color to use where alpha == 0) debugflag (generates intermediate images) Return: pixd (32 bpp rgba), or null on error
Notes: (1) This is one of the few operations in leptonica that uses the alpha blending component in rgba images. It sets the r, g and b components under every fully transparent alpha component to . (2) Full transparency is denoted by alpha == 0. By setting all pixels to where alpha == 0, this can improve compressibility by reducing the entropy. (3) The visual result depends on how the image is displayed. (a) For display devices that respect the use of the alpha layer, this will not affect the appearance. (b) For typical leptonica operations, alpha is ignored, so there will be a change in appearance because this resets the rgb values in the fully transparent region. (4) For reading and writing rgba pix in png format, use pixReadRGBAPng() and pixWriteRGBAPng(). (5) For example, if you want to rewrite all fully transparent pixels in a png file to white: pixs = pixReadRGBAPng(<infile>); // special read pixd = pixSetUnderTransparency(pixs, 0xffffff00, 0); Then either use a normal write if you won't be using transparency: pixWrite(<outfile>, pixd, IFF_PNG); or an RGBA write if you want to preserve the transparency layer pixWriteRGBAPng(<outfile>, pixd); // special write (6) Caution. Because rgb images in leptonica typically have value 0 in the alpha channel, this function would interpret the entire image as fully transparent, and set every pixel to . Because this is not desirable, instead we issue a warning and return a copy of the input pix. If you really want to set every pixel to the same value, use pixSetAllArbitrary().
Definition at line 903 of file pix3.c.
References COLOR_BLUE, COLOR_GREEN, COLOR_RED, ERROR_PTR, extractRGBValues(), IFF_PNG, L_ALPHA_CHANNEL, L_WARNING, NULL, pixaCreate(), pixaDestroy(), pixaDisplay(), pixCopy(), pixCreateRGBImage(), pixDestroy(), pixGetDepth(), pixGetRGBComponent(), pixSaveTiled(), pixSetMasked(), pixSetRGBComponent(), pixThresholdToBinary(), pixWriteTempfile(), pixZero(), and PROCNAME.
Referenced by main().
Input: pixd (<optional>; this can be null, equal to pixs, or different from pixs) pixs Return: pixd, or null on error
Notes: (1) This inverts pixs, for all pixel depths. (2) There are 3 cases: (a) pixd == null, ~src --> new pixd (b) pixd == pixs, ~src --> src (in-place) (c) pixd != pixs, ~src --> input pixd (3) For clarity, if the case is known, use these patterns: (a) pixd = pixInvert(NULL, pixs); (b) pixInvert(pixs, pixs); (c) pixInvert(pixd, pixs);
Definition at line 1002 of file pix3.c.
References ERROR_PTR, NULL, PIX_DST, PIX_NOT, pixCopy(), pixGetHeight(), pixGetWidth(), pixRasterop(), and PROCNAME.
Referenced by ccbaDisplayImage1(), ccbaDisplayImage2(), DoPageSegmentation(), main(), pixBackgroundNorm(), pixBackgroundNormGrayArray(), pixBackgroundNormGrayArrayMorph(), pixBackgroundNormMorph(), pixBackgroundNormRGBArrays(), pixBackgroundNormRGBArraysMorph(), pixBlockrank(), pixClipMasked(), pixColorsForQuantization(), pixConformsToRectangle(), pixConvertTo1(), pixFillClosedBorders(), pixGenerateSelRandom(), pixGenerateSelWithRuns(), pixGenTextlineMask(), pixGetBackgroundGrayMap(), pixGetBackgroundGrayMapMorph(), pixGetBackgroundRGBMap(), pixGetBackgroundRGBMapMorph(), pixHolesByFilling(), pixLocalExtrema(), pixLocateBarcodes(), pixMaskedThreshOnBackgroundNorm(), pixPaintSelfThroughMask(), pixPaintThroughMask(), pixReadFromTiffStream(), pixReadStreamPng(), pixRemoveColormap(), pixRunHistogramMorph(), pixRunlengthTransform(), pixSeedfillBinaryRestricted(), pixSeedfillGrayBasin(), pixSetMasked(), pixSetMaskedGeneral(), PixTestEqual(), pixThinGeneral(), pixThresholdForFgBg(), pixThresholdSpreadNorm(), pixWriteSegmentedPageToPS(), pixWriteStreamBmp(), pixWriteStreamPng(), and TestDistance().
Input: pixd (<optional>; this can be null, equal to pixs1, different from pixs1) pixs1 (can be == pixd) pixs2 (must be != pixd) Return: pixd always
Notes: (1) This gives the union of two images with equal depth, aligning them to the the UL corner. pixs1 and pixs2 need not have the same width and height. (2) There are 3 cases: (a) pixd == null, (src1 | src2) --> new pixd (b) pixd == pixs1, (src1 | src2) --> src1 (in-place) (c) pixd != pixs1, (src1 | src2) --> input pixd (3) For clarity, if the case is known, use these patterns: (a) pixd = pixOr(NULL, pixs1, pixs2); (b) pixOr(pixs1, pixs1, pixs2); (c) pixOr(pixd, pixs1, pixs2); (4) The size of the result is determined by pixs1. (5) The depths of pixs1 and pixs2 must be equal. (6) Note carefully that the order of pixs1 and pixs2 only matters for the in-place case. For in-place, you must have pixd == pixs1. Setting pixd == pixs2 gives an incorrect result: the copy puts pixs1 image data in pixs2, and the rasterop is then between pixs2 and pixs2 (a no-op).
Definition at line 1051 of file pix3.c.
References ERROR_PTR, L_WARNING, NULL, PIX_DST, PIX_SRC, pixCopy(), pixGetDepth(), pixGetHeight(), pixGetWidth(), pixRasterop(), pixSizesEqual(), and PROCNAME.
Referenced by DoPageSegmentation(), main(), pixGenerateBarcodeMask(), pixGetRegionsBinary(), pixHolesByFilling(), pixMirrorDetect(), pixMirrorDetectDwa(), pixThinGeneral(), pixUnionOfMorphOps(), pixUpDownDetectGeneral(), and pixUpDownDetectGeneralDwa().
Input: pixd (<optional>; this can be null, equal to pixs1, different from pixs1) pixs1 (can be == pixd) pixs2 (must be != pixd) Return: pixd always
Notes: (1) This gives the intersection of two images with equal depth, aligning them to the the UL corner. pixs1 and pixs2 need not have the same width and height. (2) There are 3 cases: (a) pixd == null, (src1 & src2) --> new pixd (b) pixd == pixs1, (src1 & src2) --> src1 (in-place) (c) pixd != pixs1, (src1 & src2) --> input pixd (3) For clarity, if the case is known, use these patterns: (a) pixd = pixAnd(NULL, pixs1, pixs2); (b) pixAnd(pixs1, pixs1, pixs2); (c) pixAnd(pixd, pixs1, pixs2); (4) The size of the result is determined by pixs1. (5) The depths of pixs1 and pixs2 must be equal. (6) Note carefully that the order of pixs1 and pixs2 only matters for the in-place case. For in-place, you must have pixd == pixs1. Setting pixd == pixs2 gives an incorrect result: the copy puts pixs1 image data in pixs2, and the rasterop is then between pixs2 and pixs2 (a no-op).
Definition at line 1113 of file pix3.c.
References ERROR_PTR, L_WARNING, NULL, PIX_DST, PIX_SRC, pixCopy(), pixGetDepth(), pixGetHeight(), pixGetWidth(), pixRasterop(), pixSizesEqual(), and PROCNAME.
Referenced by DoPageSegmentation(), main(), pixaClipToPix(), pixaMorphSequenceByRegion(), pixCombineMasked(), pixCombineMaskedGeneral(), pixCorrelationBinary(), pixDisplayDiffBinary(), pixGetBackgroundGrayMapMorph(), pixGetBackgroundRGBMapMorph(), pixIntersectionOfMorphOps(), pixMirrorDetect(), pixMirrorDetectDwa(), pixSeedfillMorph(), pixSelectedLocalExtrema(), pixSetMaskedGeneral(), pixUpDownDetectGeneral(), and pixUpDownDetectGeneralDwa().
Input: pixd (<optional>; this can be null, equal to pixs1, different from pixs1) pixs1 (can be == pixd) pixs2 (must be != pixd) Return: pixd always
Notes: (1) This gives the XOR of two images with equal depth, aligning them to the the UL corner. pixs1 and pixs2 need not have the same width and height. (2) There are 3 cases: (a) pixd == null, (src1 ^ src2) --> new pixd (b) pixd == pixs1, (src1 ^ src2) --> src1 (in-place) (c) pixd != pixs1, (src1 ^ src2) --> input pixd (3) For clarity, if the case is known, use these patterns: (a) pixd = pixXor(NULL, pixs1, pixs2); (b) pixXor(pixs1, pixs1, pixs2); (c) pixXor(pixd, pixs1, pixs2); (4) The size of the result is determined by pixs1. (5) The depths of pixs1 and pixs2 must be equal. (6) Note carefully that the order of pixs1 and pixs2 only matters for the in-place case. For in-place, you must have pixd == pixs1. Setting pixd == pixs2 gives an incorrect result: the copy puts pixs1 image data in pixs2, and the rasterop is then between pixs2 and pixs2 (a no-op).
Definition at line 1175 of file pix3.c.
References ERROR_PTR, L_WARNING, NULL, PIX_DST, PIX_SRC, pixCopy(), pixGetDepth(), pixGetHeight(), pixGetWidth(), pixRasterop(), pixSizesEqual(), and PROCNAME.
Referenced by DoComparisonDwa1(), DoComparisonDwa3(), DoPageSegmentation(), main(), pixColorSegmentClean(), pixCompareBinary(), pixConnCompPixa(), pixExtractBoundary(), pixFindAreaPerimRatio(), pixFindPerimSizeRatio(), pixGenerateBarcodeMask(), pixGenerateSelBoundary(), pixMirrorDetect(), pixMirrorDetectDwa(), pixQualifyLocalMinima(), pixRemoveBorderConnComps(), pixRemoveSeededComponents(), ptaGetBoundaryPixels(), RotateOrthTest(), and selDisplayInPix().
Input: pixd (<optional>; this can be null, equal to pixs1, equal to pixs2, or different from both pixs1 and pixs2) pixs1 (can be == pixd) pixs2 (can be == pixd) Return: pixd always
Notes: (1) This gives the set subtraction of two images with equal depth, aligning them to the the UL corner. pixs1 and pixs2 need not have the same width and height. (2) Source pixs2 is always subtracted from source pixs1. The result is pixs1 \ pixs2 = pixs1 & (~pixs2) (3) There are 4 cases: (a) pixd == null, (src1 - src2) --> new pixd (b) pixd == pixs1, (src1 - src2) --> src1 (in-place) (c) pixd == pixs2, (src1 - src2) --> src2 (in-place) (d) pixd != pixs1 && pixd != pixs2), (src1 - src2) --> input pixd (4) For clarity, if the case is known, use these patterns: (a) pixd = pixSubtract(NULL, pixs1, pixs2); (b) pixSubtract(pixs1, pixs1, pixs2); (c) pixSubtract(pixs2, pixs1, pixs2); (d) pixSubtract(pixd, pixs1, pixs2); (5) The size of the result is determined by pixs1. (6) The depths of pixs1 and pixs2 must be equal.
Definition at line 1238 of file pix3.c.
References ERROR_PTR, L_WARNING, NULL, PIX_DST, PIX_NOT, PIX_SRC, pixCopy(), pixGetDepth(), pixGetDimensions(), pixRasterop(), pixSizesEqual(), and PROCNAME.
Referenced by DoPageSegmentation(), main(), pixCompareBinary(), pixDisplayDiffBinary(), pixFillClosedBorders(), pixGenHalftoneMask(), pixGenTextblockMask(), pixGenTextlineMask(), pixGetRegionsBinary(), pixSelectedLocalExtrema(), pixThinGeneral(), and selDisplayInPix().
Input: pix (all depths; not colormapped) &empty (<return> 1 if all bits in image are 0; 0 otherwise) Return: 0 if OK; 1 on error
Notes: (1) For a binary image, if there are no fg (black) pixels, empty = 1. (2) For a grayscale image, if all pixels are black (0), empty = 1. (3) For an RGB image, if all 4 components in every pixel is 0, empty = 1.
Definition at line 1299 of file pix3.c.
References ERROR_INT, NULL, pixGetColormap(), pixGetData(), pixGetDepth(), pixGetHeight(), pixGetWidth(), pixGetWpl(), and PROCNAME.
Referenced by DoPageSegmentation(), jbGetComponents(), main(), pixBackgroundNorm(), pixBackgroundNormGrayArray(), pixBackgroundNormGrayArrayMorph(), pixBackgroundNormMorph(), pixBackgroundNormRGBArrays(), pixBackgroundNormRGBArraysMorph(), pixCompareGray(), pixCompareRGB(), pixConformsToRectangle(), pixConnCompBB(), pixConnCompPixa(), pixCountConnComp(), pixFindSkewSweep(), pixFindSkewSweepAndSearchScorePivot(), pixGenHalftoneMask(), pixGenTextlineMask(), pixGetBackgroundGrayMap(), pixGetBackgroundGrayMapMorph(), pixGetBackgroundRGBMap(), pixGetBackgroundRGBMapMorph(), pixGetCCBorders(), pixGetOuterBorderPta(), pixHaustest(), pixSelectByAreaFraction(), pixSelectByAreaPerimRatio(), pixSelectBySize(), pixSelectByWidthHeightRatio(), pixSetUnderTransparency(), pixSmoothConnectedRegions(), pixWriteSegmentedPageToPS(), and RotateOrthTest().
Input: pix (1 bpp) &count (<return> count of ON pixels) tab8 (<optional> 8-bit pixel lookup table) Return: 0 if OK; 1 on error
Definition at line 1352 of file pix3.c.
References ERROR_INT, FREE, makePixelSumTab8(), NULL, pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Referenced by boxaGetCoverage(), finalPositioningForAlignment(), main(), pixaCountPixels(), pixCompareBinary(), pixConnCompBB(), pixConnCompPixa(), pixCorrelationBinary(), pixCorrelationScoreSimple(), pixFillHolesToBoundingRect(), pixFindAreaFraction(), pixFindAreaPerimRatio(), pixFindOverlapFraction(), pixFindPerimSizeRatio(), pixGetGrayHistogram(), pixMirrorDetect(), pixMirrorDetectDwa(), pixRunHistogramMorph(), pixUpDownDetectGeneral(), pixUpDownDetectGeneralDwa(), and RotateOrthTest().
Input: pixa (array of 1 bpp pix) Return: na of ON pixels in each pix, or null on error
Definition at line 1418 of file pix3.c.
References ERROR_PTR, FREE, L_CLONE, makePixelSumTab8(), NULL, numaAddNumber(), numaCreate(), pixaGetCount(), pixaGetPix(), pixCountPixels(), pixDestroy(), pixGetDepth(), and PROCNAME.
Referenced by jbClassifyRankHaus().
Input: pix (1 bpp) row number &count (<return> sum of ON pixels in raster line) tab8 (<optional> 8-bit pixel lookup table) Return: 0 if OK; 1 on error
Definition at line 1464 of file pix3.c.
References ERROR_INT, FREE, makePixelSumTab8(), NULL, pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Referenced by pixCountPixelsByRow().
Input: pix (1 bpp) tab8 (<optional> 8-bit pixel lookup table) Return: na of counts, or null on error
Definition at line 1532 of file pix3.c.
References ERROR_PTR, FREE, makePixelSumTab8(), NULL, numaAddNumber(), numaCreate(), pixCountPixelsInRow(), pixGetDepth(), pixGetHeight(), and PROCNAME.
Referenced by pixFindBaselines(), pixFindDifferentialSquareSum(), pixFindNormalizedSquareSum(), pixGetTextBaseline(), and pixSumPixelsByRow().
Input: pix (1 bpp) Return: na of counts in each column, or null on error
Definition at line 1571 of file pix3.c.
References ERROR_PTR, GET_DATA_BIT, L_NOCOPY, NULL, numaCreate(), numaGetFArray(), numaSetCount(), pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Referenced by pixSumPixelsByColumn().
Input: pix (1, 8 or 16 bpp; no colormap) tab8 (<optional> lookup table for 1 bpp; use null for 8 bpp) Return: na of pixel sums by row, or null on error
Notes: (1) To resample for a bin size different from 1, use numaUniformSampling() on the result of this function.
Definition at line 1614 of file pix3.c.
References ERROR_PTR, GET_DATA_BYTE, GET_DATA_TWO_BYTES, NULL, numaAddNumber(), numaCreate(), pixCountPixelsByRow(), pixGetColormap(), pixGetData(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Input: pix (1, 8 or 16 bpp; no colormap) Return: na of pixel sums by column, or null on error
Notes: (1) To resample for a bin size different from 1, use numaUniformSampling() on the result of this function.
Definition at line 1670 of file pix3.c.
References ERROR_PTR, GET_DATA_BYTE, GET_DATA_TWO_BYTES, L_NOCOPY, NULL, numaCreate(), numaGetFArray(), numaSetCount(), pixCountPixelsByColumn(), pixGetColormap(), pixGetData(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Input: pix (1 bpp) threshold &above (<return> 1 if above threshold; 0 if equal to or less than threshold) tab8 (<optional> 8-bit pixel lookup table) Return: 0 if OK; 1 on error
Notes: (1) This sums the ON pixels and returns immediately if the count goes above threshold. It is therefore more efficient for matching images (by running this function on the xor of the 2 images) than using pixCountPixels(), which counts all pixels before returning.
Definition at line 1730 of file pix3.c.
References ERROR_INT, FREE, makePixelSumTab8(), NULL, pixGetData(), pixGetDepth(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Referenced by pixRankHaustest().
| l_int32* makePixelSumTab8 | ( | void | ) |
Input: void Return: table of 256 l_int32, or null on error
Notes: (1) This table of integers gives the number of 1 bits in the 8 bit index.
Definition at line 1807 of file pix3.c.
References CALLOC, ERROR_PTR, NULL, and PROCNAME.
Referenced by jbClassifyCorrelation(), jbClassifyRankHaus(), jbGetULCorners(), pixaCentroids(), pixaCountPixels(), pixaFindAreaFraction(), pixaFindAreaPerimRatio(), pixaFindPerimSizeRatio(), pixaGenerateFont(), pixCentroid(), pixCorrelationBinary(), pixCountPixels(), pixCountPixelsByRow(), pixCountPixelsInRow(), pixFillHolesToBoundingRect(), pixFindAreaFraction(), pixFindAreaPerimRatio(), pixFindOverlapFraction(), pixFindPerimSizeRatio(), pixGetTextBaseline(), pixScaleToGray16(), pixScaleToGray6(), pixScaleToGray8(), and pixThresholdPixelSum().
| l_int32* makePixelCentroidTab8 | ( | void | ) |
Input: void Return: table of 256 l_int32, or null on error
Notes: (1) This table of integers gives the centroid weight of the 1 bits in the 8 bit index. In other words, if sumtab is obtained by makePixelSumTab8, and centroidtab is obtained by makePixelCentroidTab8, then, for 1 <= i <= 255, centroidtab[i] / (float)sumtab[i] is the centroid of the 1 bits in the 8-bit index i, where the MSB is considered to have position 0 and the LSB is considered to have position 7.
Definition at line 1851 of file pix3.c.
References CALLOC, ERROR_PTR, NULL, and PROCNAME.
Referenced by jbClassifyCorrelation(), pixaCentroids(), and pixCentroid().
Input: pix (1, 2, 4, 8, 16, 32 bpp; not cmapped) box (<optional> if null, use entire image) &sum (<return> sum of pixel values in region) Return: 0 if OK; 1 on error
Definition at line 1901 of file pix3.c.
References boxClipToRectangle(), boxDestroy(), boxGetGeometry(), ERROR_INT, GET_DATA_BIT, GET_DATA_BYTE, GET_DATA_DIBIT, GET_DATA_QBIT, GET_DATA_TWO_BYTES, NULL, pixGetColormap(), pixGetData(), pixGetDimensions(), pixGetWpl(), and PROCNAME.
Input: pixs (8 or 32 bpp, small tile; to be replicated) w, h (dimensions of output pix) Return: pixd (usually larger pix, mirror-tiled with pixs), or null on error
Notes: (1) This uses mirrored tiling, where each row alternates with LR flips and every column alternates with TB flips, such that the result is a tiling with identical 2 x 2 tiles, each of which is composed of these transforms: ----------------- | 1 | LR | ----------------- | TB | LR/TB | -----------------
Definition at line 1989 of file pix3.c.
References ERROR_PTR, NULL, nx, ny, PIX_SRC, pixCreate(), pixDestroy(), pixFlipLR(), pixFlipTB(), pixGetDimensions(), pixRasterop(), and PROCNAME.
Referenced by pixPaintSelfThroughMask().
1.7.3