Converting images to csv file in python

Question

I have converted my image into a csv file and it's like a matrix but I want it to be a single row. How can I convert all of the images in dataset into a csv file (each image into one line).

Here's the code I've used:

from PIL import Image
import numpy as np
import os, os.path, time

format='.jpg'
myDir = "Lotus1"
def createFileList(myDir, format='.jpg'):
    fileList = []
    print(myDir)
    for root, dirs, files in os.walk(myDir, topdown=False):
            for name in files:
               if name.endswith(format):
                  fullName = os.path.join(root, name)
                  fileList.append(fullName)
                  return fileList

fileList = createFileList(myDir)
fileFormat='.jpg'
for fileFormat in fileList:
 format = '.jpg'
 # get original image parameters...
 width, height = fileList.size
 format = fileList.format
 mode = fileList.mode
 # Make image Greyscale
 img_grey = fileList.convert('L')
 # Save Greyscale values
 value = np.asarray(fileList.getdata(),dtype=np.float64).reshape((fileList.size[1],fileList.size[0]))
 np.savetxt("img_pixels.csv", value, delimiter=',')

input : http://uupload.ir/files/pto0_lotus1_1.jpg

output:http://uupload.ir/files/huwh_output.png

Answer 1

From your question, I think you want to know about numpy.flatten(). You want to add

value = value.flatten()

right before your np.savetxt call. It will flatten the array to only one dimension and it should then print out as a single line.

The rest of your question is unclear bit it implies you have a directory full of jpeg images and you want a way to read through them all. So first, get a file list:

def createFileList(myDir, format='.jpg'):
fileList = []
print(myDir)
for root, dirs, files in os.walk(myDir, topdown=False):
    for name in files:
        if name.endswith(format):
            fullName = os.path.join(root, name)
            fileList.append(fullName)
return fileList

The surround your code with a for fileName in fileList:

Edited to add complete example Note that I've used csv writer and changed your float64 to ints (which should be ok as pixel data is 0-255

from PIL import Image
import numpy as np
import sys
import os
import csv

#Useful function
def createFileList(myDir, format='.jpg'):
fileList = []
print(myDir)
for root, dirs, files in os.walk(myDir, topdown=False):
    for name in files:
        if name.endswith(format):
            fullName = os.path.join(root, name)
            fileList.append(fullName)
return fileList

# load the original image
myFileList = createFileList('path/to/directory/')

for file in myFileList:
    print(file)
    img_file = Image.open(file)
    # img_file.show()

    # get original image parameters...
    width, height = img_file.size
    format = img_file.format
    mode = img_file.mode

    # Make image Greyscale
    img_grey = img_file.convert('L')
    #img_grey.save('result.png')
    #img_grey.show()

    # Save Greyscale values
    value = np.asarray(img_grey.getdata(), dtype=np.int).reshape((img_grey.size[1], img_grey.size[0]))
    value = value.flatten()
    print(value)
    with open("img_pixels.csv", 'a') as f:
        writer = csv.writer(f)
        writer.writerow(value)