MATLAB - How to eliminate a shaded background in an image

Question

I am trying to process an image. There is a photograph of the RGB leaves, and I want to extract only the sheet.

The following procedure is

• I read an image from a file
• Convert to Grayscale
• Apply a 5x5 median filter.
• Convert to BW

As you can see, the shadow in the lower right corner is attached to the BW image. Is there a way to select only a sheet.

I = imread(files{404}); hcsc = vision.ColorSpaceConverter; hcsc.Conversion = 'RGB to intensity'; Ig = step(hcsc, I); medFilt= vision.MedianFilter([ff]); Ig = step(medFilt, Ig); at = vision.Autothresholder; Ibw = step(at, Ig); 

Answer 1

Instead of converting to a grayscale image, I convert it to HSV and take it V. Now the result is better.

 I = imread(files{404}); I = rgb2hsv(I); Ig = I(:,:,3); medFilt= vision.MedianFilter([ff]); Ig = step(medFilt, Ig); at = vision.Autothresholder; Ibw = step(at, Ig);