You've already forked DataMate
init datamate
This commit is contained in:
71
runtime/ops/mapper/img_enhanced_contrast/process.py
Normal file
71
runtime/ops/mapper/img_enhanced_contrast/process.py
Normal file
@@ -0,0 +1,71 @@
|
||||
# -- encoding: utf-8 --
|
||||
|
||||
"""
|
||||
Description: 图片对比度自适应增强
|
||||
Version:
|
||||
Create: 2025/01/13
|
||||
"""
|
||||
|
||||
import time
|
||||
|
||||
from typing import Dict, Any
|
||||
|
||||
import cv2
|
||||
import numpy as np
|
||||
from loguru import logger
|
||||
|
||||
from datamate.common.utils import bytes_transform
|
||||
from datamate.core.base_op import Mapper
|
||||
|
||||
|
||||
class ImgContrast(Mapper):
|
||||
"""图片对比度自适应增强"""
|
||||
|
||||
def __init__(self, *args, **kwargs):
|
||||
super(ImgContrast, self).__init__(*args, **kwargs)
|
||||
# 自适应增强参数
|
||||
self.clip_limit = 2 # 指定对比度限制阈值, 较大的值会产生更大的对比度增强效(不作为参数传入)。
|
||||
self.tile_grid = 16 # 指定图像划分的网格大小,较小的网格大小会导致更局部的均衡化效果(不作为参数传入)。
|
||||
self.standard_mean = 100 # 图片增强后的平均对比度(不作为参数传入)。
|
||||
self.eps = 0.5 # 小值,计算图像对比度增强因子的时候,防止全黑图片导致的除零错(不作为参数传入)。
|
||||
|
||||
@staticmethod
|
||||
def _get_contrast(image: np.ndarray):
|
||||
"""计算图像所有通道的平均标准差"""
|
||||
_, stddev = cv2.meanStdDev(image)
|
||||
contrast_std = np.mean(stddev)
|
||||
return contrast_std
|
||||
|
||||
def enhance_contrast(self, image_data: np.ndarray, file_name):
|
||||
"""对比度自适应增强方法"""
|
||||
|
||||
contrast_std = self._get_contrast(image_data)
|
||||
contrast_factor = self.standard_mean / (contrast_std + self.eps)
|
||||
|
||||
# 图片对比度较高,不需要增强对比度
|
||||
if contrast_factor <= 1:
|
||||
logger.info(f"fileName: {file_name}, method: ImgContrast not need enhancement")
|
||||
return image_data
|
||||
# 将彩色图像转换为Lab颜色空间
|
||||
cv2.cvtColor(image_data, cv2.COLOR_BGR2Lab, dst=image_data)
|
||||
|
||||
# 使用局部自适应直方图均衡化进行对比度调整。
|
||||
clahe = cv2.createCLAHE(clipLimit=self.clip_limit, tileGridSize=(self.tile_grid, self.tile_grid))
|
||||
image_data[:, :, 0] = clahe.apply(image_data[:, :, 0])
|
||||
|
||||
# 将增强后的Lab图像转换回BGR颜色空间
|
||||
cv2.cvtColor(image_data, cv2.COLOR_Lab2BGR, dst=image_data)
|
||||
return image_data
|
||||
|
||||
def execute(self, sample: Dict[str, Any]):
|
||||
start = time.time()
|
||||
img_bytes = sample[self.data_key]
|
||||
file_name = sample[self.filename_key]
|
||||
file_type = "." + sample[self.filetype_key]
|
||||
if img_bytes:
|
||||
# 进行图片增强
|
||||
img_data = bytes_transform.bytes_to_numpy(img_bytes)
|
||||
img_data = self.enhance_contrast(img_data, file_name)
|
||||
sample[self.data_key] = bytes_transform.numpy_to_bytes(img_data, file_type)
|
||||
logger.info(f"fileName: {file_name}, method: ImgContrast costs {time.time() - start:6f} s")
|
||||
return sample
|
||||
Reference in New Issue
Block a user