215 lines
6.3 KiB
Python
215 lines
6.3 KiB
Python
import numpy.core.multiarray # important this comes before cv!
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import ClientConstants as CC
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import cv2
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import HydrusImageHandling
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import HydrusGlobals
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if cv2.__version__.startswith( '2' ):
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IMREAD_UNCHANGED = cv2.CV_LOAD_IMAGE_UNCHANGED
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else:
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IMREAD_UNCHANGED = cv2.IMREAD_UNCHANGED
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cv_interpolation_enum_lookup = {}
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cv_interpolation_enum_lookup[ CC.ZOOM_NEAREST ] = cv2.INTER_NEAREST
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cv_interpolation_enum_lookup[ CC.ZOOM_LINEAR ] = cv2.INTER_LINEAR
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cv_interpolation_enum_lookup[ CC.ZOOM_AREA ] = cv2.INTER_AREA
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cv_interpolation_enum_lookup[ CC.ZOOM_CUBIC ] = cv2.INTER_CUBIC
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cv_interpolation_enum_lookup[ CC.ZOOM_LANCZOS4 ] = cv2.INTER_LANCZOS4
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def EfficientlyResizeNumpyImage( numpy_image, ( target_x, target_y ) ):
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( im_y, im_x, depth ) = numpy_image.shape
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if target_x >= im_x and target_y >= im_y: return numpy_image
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# this seems to slow things down a lot, at least for cv!
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#if im_x > 2 * target_x and im_y > 2 * target_y: result = cv2.resize( numpy_image, ( 2 * target_x, 2 * target_y ), interpolation = cv2.INTER_NEAREST )
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return cv2.resize( numpy_image, ( target_x, target_y ), interpolation = cv2.INTER_AREA )
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def EfficientlyThumbnailNumpyImage( numpy_image, ( target_x, target_y ) ):
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( im_y, im_x, depth ) = numpy_image.shape
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if target_x >= im_x and target_y >= im_y: return numpy_image
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( target_x, target_y ) = HydrusImageHandling.GetThumbnailResolution( ( im_x, im_y ), ( target_x, target_y ) )
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return cv2.resize( numpy_image, ( target_x, target_y ), interpolation = cv2.INTER_AREA )
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def GenerateNumpyImage( path ):
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if HydrusGlobals.client_controller.GetNewOptions().GetBoolean( 'load_images_with_pil' ):
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# a regular cv.imread call, can crash the whole process on random thumbs, hooray, so have this as backup
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# it was just the read that was the problem, so this seems to work fine, even if pil is only about half as fast
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pil_image = HydrusImageHandling.GeneratePILImage( path )
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numpy_image = GenerateNumPyImageFromPILImage( pil_image )
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else:
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numpy_image = cv2.imread( path, flags = IMREAD_UNCHANGED )
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if numpy_image.dtype == 'uint16':
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numpy_image /= 256
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numpy_image = numpy.array( numpy_image, dtype = 'uint8' )
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if numpy_image is None: # doesn't support static gifs and some random other stuff
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pil_image = HydrusImageHandling.GeneratePILImage( path )
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numpy_image = GenerateNumPyImageFromPILImage( pil_image )
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else:
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shape = numpy_image.shape
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if len( shape ) == 2:
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# monochrome image
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convert = cv2.COLOR_GRAY2RGB
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else:
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( im_y, im_x, depth ) = shape
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if depth == 4:
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convert = cv2.COLOR_BGRA2RGBA
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else:
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convert = cv2.COLOR_BGR2RGB
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numpy_image = cv2.cvtColor( numpy_image, convert )
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return numpy_image
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def GenerateNumPyImageFromPILImage( pil_image ):
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pil_image = HydrusImageHandling.Dequantize( pil_image )
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( w, h ) = pil_image.size
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s = pil_image.tobytes()
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return numpy.fromstring( s, dtype = 'uint8' ).reshape( ( h, w, len( s ) // ( w * h ) ) )
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def GeneratePerceptualHash( path ):
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numpy_image = GenerateNumpyImage( path )
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( y, x, depth ) = numpy_image.shape
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if depth == 4:
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# create weight and transform numpy_image to greyscale
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numpy_alpha = numpy_image[ :, :, 3 ]
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numpy_alpha_float = numpy_alpha / 255.0
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numpy_image_bgr = numpy_image[ :, :, :3 ]
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numpy_image_gray_bare = cv2.cvtColor( numpy_image_bgr, cv2.COLOR_RGB2GRAY )
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# create a white greyscale canvas
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white = numpy.ones( ( y, x ) ) * 255.0
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# paste the grayscale image onto the white canvas using: pixel * alpha + white * ( 1 - alpha )
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numpy_image_gray = numpy.uint8( ( numpy_image_gray_bare * numpy_alpha_float ) + ( white * ( numpy.ones( ( y, x ) ) - numpy_alpha_float ) ) )
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else:
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numpy_image_gray = cv2.cvtColor( numpy_image, cv2.COLOR_RGB2GRAY )
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numpy_image_tiny = cv2.resize( numpy_image_gray, ( 32, 32 ), interpolation = cv2.INTER_AREA )
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# convert to float and calc dct
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numpy_image_tiny_float = numpy.float32( numpy_image_tiny )
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dct = cv2.dct( numpy_image_tiny_float )
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# take top left 8x8 of dct
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dct_88 = dct[:8,:8]
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# get mean of dct, excluding [0,0]
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mask = numpy.ones( ( 8, 8 ) )
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mask[0,0] = 0
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average = numpy.average( dct_88, weights = mask )
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# make a monochromatic, 64-bit hash of whether the entry is above or below the mean
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bytes = []
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for i in range( 8 ):
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byte = 0
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for j in range( 8 ):
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byte <<= 1 # shift byte one left
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value = dct_88[i,j]
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if value > average: byte |= 1
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bytes.append( byte )
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answer = str( bytearray( bytes ) )
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# we good
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return answer
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def ResizeNumpyImage( mime, numpy_image, ( target_x, target_y ) ):
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new_options = HydrusGlobals.client_controller.GetNewOptions()
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( scale_up_quality, scale_down_quality ) = new_options.GetMediaZoomQuality( mime )
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( im_y, im_x, depth ) = numpy_image.shape
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if ( target_x, target_y ) == ( im_x, im_y ):
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return numpy_image
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else:
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if target_x > im_x or target_y > im_y:
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interpolation = cv_interpolation_enum_lookup[ scale_up_quality ]
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else:
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interpolation = cv_interpolation_enum_lookup[ scale_down_quality ]
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return cv2.resize( numpy_image, ( target_x, target_y ), interpolation = interpolation )
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