Image segmentation for extracting letters

Question

I am trying to extract the individual letters from the below image

Below is the code which I implemented for the segmentation

img = cv.imread('image10.jpg')

img_gray = cv.cvtColor(img, cv.COLOR_BGR2GRAY)
ret, thresh2 = cv.threshold(img_gray, 150, 255, cv.THRESH_BINARY_INV)
kernel = cv.getStructuringElement(cv.MORPH_RECT, (1,1))
mask = cv.morphologyEx(thresh2, cv.MORPH_DILATE, kernel)
bboxes = []
bboxes_img = img.copy()
contours = cv.findContours(mask, cv.RETR_EXTERNAL, cv.CHAIN_APPROX_SIMPLE)
contours = imutils.grab_contours(contours)
contours = sort_contours(contours, method= "left-to-right")[0]
for cntr in contours:
    x,y,w,h = cv.boundingRect(cntr)
    cv.rectangle(bboxes_img, (x, y), (x+w, y+h), (0,0,255), 1)
    bboxes.append((x,y,w,h))

cv.imshow('Image', bboxes_img)
cv.waitKey(0)

Below is the final output

Is there any way to segment the sentence perfectly to get all letters?

Any help or suggestion would be very helpful