CV之FD之HOG:圖像檢測之基於HOG算法、簡介、代碼實現(計算圖像相似度)之詳細攻略
圖像檢測之基於HOG算法、簡介、代碼實現(計算圖像相似度)之詳細攻略
相關文章:CV之FD之HOG:圖像檢測之基於HOG算法、簡介、代碼實現(計算圖像相似度)之詳細攻略
1、手寫Hog特徵提取算法
import numpy as np
import cv2
#1、灰度圖像gamma校正
def gamma(img):
return np.power(img / 255.0, 1)
#2、獲取梯度值cell圖像,梯度方向cell圖像
def div(img, cell_x, cell_y, cell_w):
cell = np.zeros(shape=(cell_x, cell_y, cell_w, cell_w))
img_x = np.split(img, cell_x, axis=0)
for i in range(cell_x):
img_y = np.split(img_x[i], cell_y, axis=1)
for j in range(cell_y):
cell[i][j] = img_y[j]
return cell
#3、獲取梯度方向直方圖圖像,每個像素點有9個值
def get_bins(grad_cell, ang_cell):
bins = np.zeros(shape=(grad_cell.shape[0], grad_cell.shape[1], 9))
for i in range(grad_cell.shape[0]):
for j in range(grad_cell.