Wie speichere ich Punkte pro Zoll (DPI)-Informationen in py-opencv? ⇐ Python

[Anonymous]

Code: Select all

import cv2

def clear(img):
back = cv2.imread("back.png", cv2.IMREAD_GRAYSCALE)
img = cv2.bitwise_xor(img, back)
ret, img = cv2.threshold(img, 120, 255, cv2.THRESH_BINARY_INV)
return img

def threshold(img):
ret, img = cv2.threshold(img, 120, 255, cv2.THRESH_BINARY_INV)
img = cv2.cvtColor(img, cv2.COLOR_RGB2GRAY)
ret, img = cv2.threshold(img, 248, 255, cv2.THRESH_BINARY)
return img

def formatImage(img):
img = threshold(img)
img = clear(img)
return img

img = formatImage(cv2.imread("1566135246468.png",cv2.IMREAD_COLOR))
cv2.imwrite("aa.png",img)
```python

This is my code. But when I tried to identify it with `tesseract-ocr`, I got a warning.

`Warning: Invalid resolution 0 dpi. Using 70 instead.`

How should I set up `dpi`?