Color detection of object in Image

Question

I am using opencv and python .

I need to detect color of object in image for example given below image , the color of shirt is red.

On this link i found something useful but its detecting image of skin . http://lokeshdhakar.com/projects/color-thief/

I think i will have to use image contour extraction and then carry out color detection for that .

score 6 · Accepted Answer · edited May 23 '17 at 11:46

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Getting the dominant colors may be achieved using the following simple approach:

from sklearn.cluster import KMeans
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.patches as patches

img = cv2.imread('red_shirt.jpg')
height, width, dim = img.shape

EDIT: take only the center of the image:

img = img[(height/4):(3*height/4), (width/4):(3*width/4), :]
height, width, dim = img.shape

img_vec = np.reshape(img, [height * width, dim] )

kmeans = KMeans(n_clusters=3)
kmeans.fit( img_vec )

EDIT: count cluster pixels, order clusters by cluster size

unique_l, counts_l = np.unique(kmeans.labels_, return_counts=True)
sort_ix = np.argsort(counts_l)
sort_ix = sort_ix[::-1]

fig = plt.figure()
ax = fig.add_subplot(111)
x_from = 0.05

for cluster_center in kmeans.cluster_centers_[sort_ix]:
    ax.add_patch(patches.Rectangle( (x_from, 0.05), 0.29, 0.9, alpha=None,
                                    facecolor='#%02x%02x%02x' % (cluster_center[2], cluster_center[1], cluster_center[0] ) ) )
    x_from = x_from + 0.31

plt.show()

You can remove BG and skin pixels with this kind of preprocessing

edited May 23 '17 at 11:46

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answered May 04 '16 at 10:12

Rosa Gronchi

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Nice ill check that out , this is the thing i was looking for – usernan May 04 '16 at 11:44
if you only need a single color you can use several heuristics for choosing the right color based on location, saturation and pixel count, but that depends on the appearance of your input and the exact requirements – Rosa Gronchi May 05 '16 at 06:21
I am removing background image and then trying to find out the color , bez most of the time its giving me white as first choice – usernan May 05 '16 at 06:28
I have modified the code to use only the image center and order the clusters by size – Rosa Gronchi May 05 '16 at 07:27
ohh thanks i was trying to do using background subtraction – usernan May 05 '16 at 08:45
Rosa Gronchi thanks for help but problem is sometimes when i want to check for pant bez of gay the main color is picked as white which i dont want , any suggestion alternative – usernan May 05 '16 at 08:54
do you have an example? – Rosa Gronchi May 05 '16 at 08:56
is the bg always white? can the items be completely white? can you ignore white pixels? – Rosa Gronchi May 05 '16 at 09:16
Problem if t shirt is white – usernan May 05 '16 at 09:18
background can be anycolor – usernan May 05 '16 at 09:19
Let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/111104/discussion-between-rosa-gronchi-and-usernan). – Rosa Gronchi May 05 '16 at 09:36
Nice ! Thanks ! How do you get the color as an object you can compare with others images ? – Revolucion for Monica Nov 17 '18 at 21:08

score 1 · Answer 2 · edited May 23 '17 at 12:00

1

Load the frame
Convert BGR to HSV
Range the value of pixel

also check out this link Color detection in opencv

edited May 23 '17 at 12:00

Community

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answered May 04 '16 at 09:32

kini_dot

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Above sol which u said is when u want to detect given color example detect blue color in image . but i want find out what is color of image – usernan May 04 '16 at 09:46

Color detection of object in Image

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