Joining Multiple Images to Display [5] | OpenCV Python Tutorials for Beginners

In this video, we look at how images and webcam feed can be joined together. This can be done using Matplotlib but it does not provide a decent frame rate for webcams. Therefore we use the NumPy library to join images together. Moreover to simply this process a function is created that will help images with just 1 line of code.

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[sahoromiyaki]

For anyone looking for this version of the function here it is:

def stackImages(scale, imgArray):
rows = len(imgArray)
cols = len(imgArray[0])
rowsAvailable = isinstance(imgArray[0], list)
width = imgArray[0][0].shape[1]
height = imgArray[0][0].shape[0]
if rowsAvailable:
for x in range ( 0, rows):
for y in range(0, cols):
if imgArray[x][y].shape[:2] == imgArray[0][0].shape [:2]:
imgArray[x][y] = cv2.resize(imgArray[x][y], (0, 0), None, scale, scale)
else:
imgArray[x][y] = cv2.resize(imgArray[x][y], (imgArray[0][0].shape[1], imgArray[0][0].shape[0]), None, scale, scale)
if len(imgArray[x][y].shape) == 2: imgArray[x][y] = cv2.cvtColor(imgArray[x][y], cv2.COLOR_GRAY2BGR)
imageBlank = np.zeros((height, width, 3), np.uint8)
hor = [imageBlank]*rows
hor_con = [imageBlank]*rows
for x in range(0, rows):
hor[x] = np.hstack(imgArray[x])
ver = np.vstack(hor)
else:
for x in range(0, rows):
if imgArray[x].shape[:2] == imgArray[0].shape[:2]:
imgArray[x] = cv2.resize(imgArray[x], (0, 0), None, scale, scale)
else:
imgArray[x] = cv2.resize(imgArray[x], (imgArray[0].shape[1], imgArray[0].shape[0]), None, scale, scale)
if len(imgArray[x].shape) == 2: imgArray[x] = cv2.cvtColor(imgArray[x], cv2.COLOR_GRAY2BGR)
hor = np.hstack(imgArray)
ver = hor
return ver

[sinozino]

dude your channel is GOLD!! thank you so much!

[GJ-iykj]

wooo! I just realized that you have steam! :D ... gamer and programming teacher = AWESOME

[tkinter]

"FIVE HUNDRED DIFFERENT IMAGES... It really heated up my PC but still it works" :) Thanks for the tutorial Murtaza.

[samadams]

I love your tutorial. It would be great if you can create tutorial for the math topics which is used in open Cv?

[AhmedAli-jjcq]

awesome, please tell me how to get the code of this function.

[maYYidtS]

videos are so expressive....can anyone share the exact function code...because 6:17 is different in Github.

[yubrajupadhayaplays]

You can use this function which is same as his but is simple to understand.

def stackImage(scale, images):
width = images[0][0].shape[1]
height = images[0][0].shape[0]
ver = None
for img in images:
hor = None
for i in img:
if i.shape[:2] == images[0][0].shape[:2]:
i = cv2.resize(i, (0, 0), None, scale, scale)
else:
i = cv2.resize(i, (width, height), None, scale, scale)

if len(i.shape) == 2:
i = cv2.cvtColor(i, cv2.COLOR_GRAY2BGR)

if hor is not None:
hor = np.hstack((hor, i))
else:
hor = i
if ver is not None:
ver = np.vstack((ver, hor))
else:
ver = hor
return ver

[eljangoolak]

Hi, what if we wanted to overlap all the photos, lets say I have different functions drawing rectangles around different objects, but then I wanted to show everything

[moustafamahmoud]

Hi, how can I fix (ValueError: all the input arrays must have same number of dimensions, but the array at index 0 has 3 dimension(s) and the array at index 2 has 2 dimension(s))

[irfan]

Thanks... Scaling not working in video stacking then i make (sizeW, sizeH) to (0, 0) in stacking function. is it ok????

[robot]

Hello my friend, I do not found the definition by you for multi images.
please help me

[risnandar]

I have some problem when I tried the code. This is the following problem:
cv2.imshow('Stacked Images', StackedImages)
TypeError: 'tuple' object is not callable
[ WARN:1] terminating async callback

Could you help me how to fix the tuple object is not callable ?
As your information, I used Windows 10, python 3.7...

[maihongngoc]

This tutorial was great, hope u'll create more video ~

[rzubruweczka]

what if i get this error error: (-215:Assertion failed) size.width>0 && size.height>0 in function 'cv::imshow'

[koraksengupta]

Sir, from where to get the stacking function?

[tkinter]

Can you apply this technic for webcam source? For example, there are two camera sources in one horizontal frame or four sources in one square frame... I have two webcam sources in different frames separately at the same time. I try to connect them in one frame or else I try to adjust position of the frames via mouse again and again, it is boring. Thanks again.

[relationshipdestiny]

How do we get access to the code you wrote that does the stacking?

[funlearn]

sit there is no source code in your channel link
we have to sighin the go

[aykutsirma]

Amazing tutorials, gj friend.

I have a question: "When I try to add more images, I still get x6 joint display; instead of 12 joints display. Do you know where do I do wrong"? thank you.

StackedImages = myUtlis.stackImages(([img, imgGray, imgBlur], # add more images horizontally inside of the array
[imgCanny, imgDilation, imgEroded],
[imgCanny, imgDilation, imgEroded],
[imgCanny, imgDilation, imgEroded]), 0.3) # Add more images vertically, and 0.3 is the scale