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I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file : answer with source code

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file : answer with source code

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)
norm_coeff = 255 / disparity.max()

cv2.namedWindow("disparity_tsukuba", 0)
cv2.imshow('disparity_tsukuba', disparity*norm_coeff/255)

cv2.waitKey(0)

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file :

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)
norm_coeff = 255 / disparity.max()

cv2.namedWindow("disparity_tsukuba", 0)
cv2.imshow('disparity_tsukuba', disparity*norm_coeff/255)

cv2.waitKey(0)

The problem is indeed that imshow() can only read CV_8U file when some functions like StereoBM or other produce CV_32F file : doc . So we need to convert from a CV_32F to a readable format for imshow()

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file :

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)
norm_coeff = 255 / disparity.max()

cv2.namedWindow("disparity_tsukuba", 0)
cv2.imshow('disparity_tsukuba', disparity*norm_coeff/255)
disparity/norm_coeff)

cv2.waitKey(0)

The problem is indeed that imshow() can only read CV_8U file when some functions like StereoBM or other produce CV_32F file : doc. So we need to convert from a CV_32F to a readable format for imshow()

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file :

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)
norm_coeff = disparity.max()

cv2.namedWindow("disparity_tsukuba", 0)
res = cv2.convertScaleAbs(disparity)
cv2.imshow('disparity_tsukuba', disparity/norm_coeff)
res)

cv2.waitKey(0)

The problem is indeed that imshow() can only read CV_8U file when some functions like StereoBM or other produce CV_32F file : doc. So we need to convert from a CV_32F to a readable format for imshow()

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file :

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)

cv2.namedWindow("disparity_tsukuba", 0)
res = cv2.convertScaleAbs(disparity)
cv2.imshow('disparity_tsukuba', res)

cv2.waitKey(0)

The problem is indeed that imshow() can only read works badly with files other than CV_8U file and can result in wrong image (like all gray images) when given 32F file, which are produced by some functions like StereoBM or other produce CV_32F file : doc. So we need to convert from a CV_32F to a readable format for imshow()

I've got the same problem with cv2.imshow(). I found a solution by modifying the data type, and imshow() can now read the file :

import numpy as np
import cv2

imgL = cv2.imread('tsukuba_l.png', 0)
imgR = cv2.imread('tsukuba_r.png', 0)

stereo = cv2.createStereoBM(numDisparities=16, blockSize=15)
disparity = stereo.compute(imgL, imgR, cv2.CV_32F)

cv2.namedWindow("disparity_tsukuba", 0)
res = cv2.convertScaleAbs(disparity)
cv2.imshow('disparity_tsukuba', res)

cv2.waitKey(0)

The problem is indeed that imshow() works badly with files other than CV_8U file and can result in wrong image (like all gray images) when given 32F file, which are produced by some functions like StereoBM or other produce CV_32F file : doc. So we need to convert from a CV_32F to a readable format for imshow()