added tv_denoise.py viewer example using the CheckBox

viewer_examples/plugins/tv_denoise.py

@@ -0,0 +1,25 @@
+from skimage import data
+from skimage.restoration import denoise_tv_chambolle
+from numpy import random, clip, uint8
+
+from skimage.viewer import ImageViewer
+from skimage.viewer.widgets import Slider, CheckBox, OKCancelButtons, SaveButtons
+from skimage.viewer.plugins.base import Plugin
+
+
+image = data.chelsea()
+sigma = 30
+
+image = image + random.normal(loc=0, scale=sigma, size=image.shape)
+image = clip(image,0,255).astype(uint8)
+viewer = ImageViewer(image)
+
+plugin = Plugin(image_filter=denoise_tv_chambolle)
+plugin += Slider('weight', 0, 5, value=0.3, value_type='float')
+plugin += Slider('n_iter_max', 1, 1000, value=100, value_type='int')
+plugin += CheckBox('multichannel',value=True)
+plugin += SaveButtons()
+plugin += OKCancelButtons()
+
+viewer += plugin
+viewer.show()