How to remove background from an image ?

How to remove the artificial background colors and characters from an image and only remain the main object ?

I attached a sample image

Answer 1

[Image Analyst]

What are you calling background? And what is "artificial"? What is your definition of "artificial"? You can mask out parts of the image. See my attached demo for that. Can the item for sale in the middle of the picture be any wild colors? Or will they always be grayscale? Please upload 2 or 3 images along with desired output images.

[Victor Yi]

the item for sale in the middle of the sample picture can be any color, it is a photo of the item. "background" and "artificial" in my question means they are not the item or a part of the item. Here is another sample image.

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[Image Analyst]

What you might try is to convert the RGB image into HSV color space with rgb2hsv(). Then threshold at some high s value because the computer graphics will all be highly saturated, pure colors. Then set those pixels to white or something. Something like

% Convert RGB image into HSV color space.
hsvImage = rgb2hsv(rgbImage);
% Extract individual H, S, and V images.
h = hsvImage(:,:, 1);
s = hsvImage(:,:, 2);
v = hsvImage(:,:, 3);
% Threshold to find vivid colors.
mask = v > 0.7;
% Make image white in mask areas:
h(mask) = 0;
s(mask) = 0;
v(mask) = 1;
% Convert back to RGB
hsvImage = cat(3, h, s, v);
newRGB = hsv2rgb(hsvImage);

[Victor Yi]

Thank you for the sample code ! however it turned out that characters and some of the edges in sample images still remained, is there anything else I should try ?

[Image Analyst]

Try adjusting the saturation threshold. Or use bwareaopen() to get rid of small blobs.