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264
utils/image_utils.py
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264
utils/image_utils.py
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import sys
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from utils import random_utils
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import numpy as np
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import cv2
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import localization
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from scipy.spatial import Delaunay
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from PIL import Image, ImageDraw, ImageFont
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def channel_hist_match(source, template, mask=None):
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# Code borrowed from:
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# https://stackoverflow.com/questions/32655686/histogram-matching-of-two-images-in-python-2-x
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masked_source = source
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masked_template = template
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if mask is not None:
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masked_source = source * mask
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masked_template = template * mask
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oldshape = source.shape
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source = source.ravel()
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template = template.ravel()
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masked_source = masked_source.ravel()
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masked_template = masked_template.ravel()
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s_values, bin_idx, s_counts = np.unique(source, return_inverse=True,
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return_counts=True)
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t_values, t_counts = np.unique(template, return_counts=True)
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ms_values, mbin_idx, ms_counts = np.unique(source, return_inverse=True,
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return_counts=True)
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mt_values, mt_counts = np.unique(template, return_counts=True)
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s_quantiles = np.cumsum(s_counts).astype(np.float64)
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s_quantiles /= s_quantiles[-1]
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t_quantiles = np.cumsum(t_counts).astype(np.float64)
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t_quantiles /= t_quantiles[-1]
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interp_t_values = np.interp(s_quantiles, t_quantiles, t_values)
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return interp_t_values[bin_idx].reshape(oldshape)
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def color_hist_match(src_im, tar_im, mask=None):
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h,w,c = src_im.shape
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matched_R = channel_hist_match(src_im[:,:,0], tar_im[:,:,0], mask)
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matched_G = channel_hist_match(src_im[:,:,1], tar_im[:,:,1], mask)
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matched_B = channel_hist_match(src_im[:,:,2], tar_im[:,:,2], mask)
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to_stack = (matched_R, matched_G, matched_B)
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for i in range(3, c):
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to_stack += ( src_im[:,:,i],)
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matched = np.stack(to_stack, axis=-1).astype(src_im.dtype)
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return matched
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pil_fonts = {}
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def _get_pil_font (font, size):
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global pil_fonts
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try:
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font_str_id = '%s_%d' % (font, size)
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if font_str_id not in pil_fonts.keys():
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pil_fonts[font_str_id] = ImageFont.truetype(font + ".ttf", size=size, encoding="unic")
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pil_font = pil_fonts[font_str_id]
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return pil_font
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except:
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return ImageFont.load_default()
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def get_text_image( shape, text, color=(1,1,1), border=0.2, font=None):
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try:
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size = shape[1]
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pil_font = _get_pil_font( localization.get_default_ttf_font_name() , size)
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text_width, text_height = pil_font.getsize(text)
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canvas = Image.new('RGB', shape[0:2], (0,0,0) )
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draw = ImageDraw.Draw(canvas)
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offset = ( 0, 0)
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draw.text(offset, text, font=pil_font, fill=tuple((np.array(color)*255).astype(np.int)) )
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result = np.asarray(canvas) / 255
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if shape[2] != 3:
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result = np.concatenate ( (result, np.ones ( (shape[1],) + (shape[0],) + (shape[2]-3,)) ), axis=2 )
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return result
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except:
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return np.zeros ( (shape[1], shape[0], shape[2]), dtype=np.float32 )
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def draw_text( image, rect, text, color=(1,1,1), border=0.2, font=None):
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h,w,c = image.shape
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l,t,r,b = rect
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l = np.clip (l, 0, w-1)
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r = np.clip (r, 0, w-1)
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t = np.clip (t, 0, h-1)
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b = np.clip (b, 0, h-1)
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image[t:b, l:r] += get_text_image ( (r-l,b-t,c) , text, color, border, font )
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def draw_text_lines (image, rect, text_lines, color=(1,1,1), border=0.2, font=None):
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text_lines_len = len(text_lines)
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if text_lines_len == 0:
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return
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l,t,r,b = rect
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h = b-t
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h_per_line = h // text_lines_len
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for i in range(0, text_lines_len):
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draw_text (image, (l, i*h_per_line, r, (i+1)*h_per_line), text_lines[i], color, border, font)
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def get_draw_text_lines ( image, rect, text_lines, color=(1,1,1), border=0.2, font=None):
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image = np.zeros ( image.shape, dtype=np.float )
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draw_text_lines ( image, rect, text_lines, color, border, font)
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return image
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def draw_polygon (image, points, color, thickness = 1):
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points_len = len(points)
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for i in range (0, points_len):
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p0 = tuple( points[i] )
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p1 = tuple( points[ (i+1) % points_len] )
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cv2.line (image, p0, p1, color, thickness=thickness)
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def draw_rect(image, rect, color, thickness=1):
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l,t,r,b = rect
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draw_polygon (image, [ (l,t), (r,t), (r,b), (l,b ) ], color, thickness)
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def rectContains(rect, point) :
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return not (point[0] < rect[0] or point[0] >= rect[2] or point[1] < rect[1] or point[1] >= rect[3])
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def applyAffineTransform(src, srcTri, dstTri, size) :
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warpMat = cv2.getAffineTransform( np.float32(srcTri), np.float32(dstTri) )
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return cv2.warpAffine( src, warpMat, (size[0], size[1]), None, flags=cv2.INTER_LINEAR, borderMode=cv2.BORDER_REFLECT_101 )
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def morphTriangle(dst_img, src_img, st, dt) :
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(h,w,c) = dst_img.shape
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sr = np.array( cv2.boundingRect(np.float32(st)) )
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dr = np.array( cv2.boundingRect(np.float32(dt)) )
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sRect = st - sr[0:2]
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dRect = dt - dr[0:2]
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d_mask = np.zeros((dr[3], dr[2], c), dtype = np.float32)
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cv2.fillConvexPoly(d_mask, np.int32(dRect), (1.0,)*c, 8, 0);
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imgRect = src_img[sr[1]:sr[1] + sr[3], sr[0]:sr[0] + sr[2]]
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size = (dr[2], dr[3])
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warpImage1 = applyAffineTransform(imgRect, sRect, dRect, size)
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dst_img[dr[1]:dr[1]+dr[3], dr[0]:dr[0]+dr[2]] = dst_img[dr[1]:dr[1]+dr[3], dr[0]:dr[0]+dr[2]]*(1-d_mask) + warpImage1 * d_mask
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def morph_by_points (image, sp, dp):
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if sp.shape != dp.shape:
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raise ValueError ('morph_by_points() sp.shape != dp.shape')
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(h,w,c) = image.shape
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result_image = np.zeros(image.shape, dtype = image.dtype)
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for tri in Delaunay(dp).simplices:
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morphTriangle(result_image, image, sp[tri], dp[tri])
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return result_image
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def equalize_and_stack_square (images, axis=1):
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max_c = max ([ 1 if len(image.shape) == 2 else image.shape[2] for image in images ] )
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target_wh = 99999
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for i,image in enumerate(images):
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if len(image.shape) == 2:
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h,w = image.shape
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c = 1
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else:
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h,w,c = image.shape
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if h < target_wh:
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target_wh = h
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if w < target_wh:
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target_wh = w
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for i,image in enumerate(images):
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if len(image.shape) == 2:
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h,w = image.shape
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c = 1
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else:
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h,w,c = image.shape
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if c < max_c:
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if c == 1:
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if len(image.shape) == 2:
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image = np.expand_dims ( image, -1 )
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image = np.concatenate ( (image,)*max_c, -1 )
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elif c == 2: #GA
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image = np.expand_dims ( image[...,0], -1 )
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image = np.concatenate ( (image,)*max_c, -1 )
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else:
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image = np.concatenate ( (image, np.ones((h,w,max_c - c))), -1 )
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if h != target_wh or w != target_wh:
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image = cv2.resize ( image, (target_wh, target_wh) )
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h,w,c = image.shape
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images[i] = image
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return np.concatenate ( images, axis = 1 )
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def bgr2hsv (img):
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return cv2.cvtColor(img, cv2.COLOR_BGR2HSV)
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def hsv2bgr (img):
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return cv2.cvtColor(img, cv2.COLOR_HSV2BGR)
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def bgra2hsva (img):
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return np.concatenate ( (cv2.cvtColor(img[...,0:3], cv2.COLOR_BGR2HSV ), np.expand_dims (img[...,3], -1)), -1 )
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def bgra2hsva_list (imgs):
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return [ bgra2hsva(img) for img in imgs ]
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def hsva2bgra (img):
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return np.concatenate ( (cv2.cvtColor(img[...,0:3], cv2.COLOR_HSV2BGR ), np.expand_dims (img[...,3], -1)), -1 )
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def hsva2bgra_list (imgs):
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return [ hsva2bgra(img) for img in imgs ]
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def gen_warp_params (source, flip, rotation_range=[-10,10], scale_range=[-0.5, 0.5], tx_range=[-0.05, 0.05], ty_range=[-0.05, 0.05] ):
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h,w,c = source.shape
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if (h != w) or (w != 64 and w != 128 and w != 256 and w != 512 and w != 1024):
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raise ValueError ('TrainingDataGenerator accepts only square power of 2 images.')
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rotation = np.random.uniform( rotation_range[0], rotation_range[1] )
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scale = np.random.uniform(1 +scale_range[0], 1 +scale_range[1])
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tx = np.random.uniform( tx_range[0], tx_range[1] )
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ty = np.random.uniform( ty_range[0], ty_range[1] )
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#random warp by grid
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cell_size = [ w // (2**i) for i in range(1,4) ] [ np.random.randint(3) ]
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cell_count = w // cell_size + 1
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grid_points = np.linspace( 0, w, cell_count)
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mapx = np.broadcast_to(grid_points, (cell_count, cell_count)).copy()
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mapy = mapx.T
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mapx[1:-1,1:-1] = mapx[1:-1,1:-1] + random_utils.random_normal( size=(cell_count-2, cell_count-2) )*(cell_size*0.24)
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mapy[1:-1,1:-1] = mapy[1:-1,1:-1] + random_utils.random_normal( size=(cell_count-2, cell_count-2) )*(cell_size*0.24)
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half_cell_size = cell_size // 2
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mapx = cv2.resize(mapx, (w+cell_size,)*2 )[half_cell_size:-half_cell_size-1,half_cell_size:-half_cell_size-1].astype(np.float32)
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mapy = cv2.resize(mapy, (w+cell_size,)*2 )[half_cell_size:-half_cell_size-1,half_cell_size:-half_cell_size-1].astype(np.float32)
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#random transform
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random_transform_mat = cv2.getRotationMatrix2D((w // 2, w // 2), rotation, scale)
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random_transform_mat[:, 2] += (tx*w, ty*w)
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params = dict()
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params['mapx'] = mapx
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params['mapy'] = mapy
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params['rmat'] = random_transform_mat
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params['w'] = w
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params['flip'] = flip and np.random.randint(10) < 4
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return params
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def warp_by_params (params, img, warp, transform, flip):
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if warp:
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img = cv2.remap(img, params['mapx'], params['mapy'], cv2.INTER_LANCZOS4 )
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if transform:
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img = cv2.warpAffine( img, params['rmat'], (params['w'], params['w']), borderMode=cv2.BORDER_CONSTANT, flags=cv2.INTER_LANCZOS4 )
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if flip and params['flip']:
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img = img[:,::-1,:]
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return img
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