#include <thresholder.h>
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ImageThresholder () | |
virtual | ~ImageThresholder () |
virtual void | Clear () |
Destroy the Pix if there is one, freeing memory. More... | |
bool | IsEmpty () const |
Return true if no image has been set. More... | |
void | SetImage (const unsigned char *imagedata, int width, int height, int bytes_per_pixel, int bytes_per_line) |
void | SetRectangle (int left, int top, int width, int height) |
virtual void | GetImageSizes (int *left, int *top, int *width, int *height, int *imagewidth, int *imageheight) |
bool | IsColor () const |
Return true if the source image is color. More... | |
bool | IsBinary () const |
Returns true if the source image is binary. More... | |
int | GetScaleFactor () const |
void | SetSourceYResolution (int ppi) |
int | GetSourceYResolution () const |
int | GetScaledYResolution () const |
void | SetEstimatedResolution (int ppi) |
int | GetScaledEstimatedResolution () const |
void | SetImage (const Pix *pix) |
virtual bool | ThresholdToPix (PageSegMode pageseg_mode, Pix **pix) |
Returns false on error. More... | |
virtual Pix * | GetPixRectThresholds () |
Pix * | GetPixRect () |
virtual Pix * | GetPixRectGrey () |
Protected Member Functions | |
virtual void | Init () |
Common initialization shared between SetImage methods. More... | |
bool | IsFullImage () const |
Return true if we are processing the full image. More... | |
void | OtsuThresholdRectToPix (Pix *src_pix, Pix **out_pix) const |
void | ThresholdRectToPix (Pix *src_pix, int num_channels, const int *thresholds, const int *hi_values, Pix **pix) const |
Protected Attributes | |
Pix * | pix_ |
int | image_width_ |
int | image_height_ |
int | pix_channels_ |
int | pix_wpl_ |
int | scale_ |
int | yres_ |
int | estimated_res_ |
int | rect_left_ |
int | rect_top_ |
int | rect_width_ |
int | rect_height_ |
Base class for all tesseract image thresholding classes. Specific classes can add new thresholding methods by overriding ThresholdToPix. Each instance deals with a single image, but the design is intended to be useful for multiple calls to SetRectangle and ThresholdTo* if desired.
tesseract::ImageThresholder::ImageThresholder | ( | ) |
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Destroy the Pix if there is one, freeing memory.
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Get enough parameters to be able to rebuild bounding boxes in the original image (not just within the rectangle). Left and top are enough with top-down coordinates, but the height of the rectangle and the image are needed for bottom-up.
Pix * tesseract::ImageThresholder::GetPixRect | ( | ) |
Get a clone/copy of the source image rectangle. The returned Pix must be pixDestroyed. This function will be used in the future by the page layout analysis, and the layout analysis that uses it will only be available with Leptonica, so there is no raw equivalent.
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Common initialization shared between SetImage methods.
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Returns true if the source image is binary.
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Return true if the source image is color.
bool tesseract::ImageThresholder::IsEmpty | ( | ) | const |
Return true if no image has been set.
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Return true if we are processing the full image.
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void tesseract::ImageThresholder::SetImage | ( | const unsigned char * | imagedata, |
int | width, | ||
int | height, | ||
int | bytes_per_pixel, | ||
int | bytes_per_line | ||
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SetImage makes a copy of all the image data, so it may be deleted immediately after this call. Greyscale of 8 and color of 24 or 32 bits per pixel may be given. Palette color images will not work properly and must be converted to 24 bit. Binary images of 1 bit per pixel may also be given but they must be byte packed with the MSB of the first byte being the first pixel, and a one pixel is WHITE. For binary images set bytes_per_pixel=0.
void tesseract::ImageThresholder::SetImage | ( | const Pix * | pix | ) |
Pix vs raw, which to use? Pix is the preferred input for efficiency, since raw buffers are copied. SetImage for Pix clones its input, so the source pix may be pixDestroyed immediately after, but may not go away until after the Thresholder has finished with it.
void tesseract::ImageThresholder::SetRectangle | ( | int | left, |
int | top, | ||
int | width, | ||
int | height | ||
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Store the coordinates of the rectangle to process for later use. Doesn't actually do any thresholding.
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Threshold the rectangle, taking everything except the src_pix from the class, using thresholds/hi_values to the output pix. NOTE that num_channels is the size of the thresholds and hi_values
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Returns false on error.
Threshold the source image as efficiently as possible to the output Pix. Creates a Pix and sets pix to point to the resulting pointer. Caller must use pixDestroy to free the created Pix. Returns false on error.
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Clone or other copy of the source Pix. The pix will always be PixDestroy()ed on destruction of the class.
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