Convert Grayscale Image to a Black and White Image by Certain Threshold Number
169 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
Sarah
el 14 de Sept. de 2018
Respondida: Image Analyst
el 15 de Sept. de 2018
I have a greyscale image where the matrix contains numbers between 0 (black) to 255 (white). I want to convert this image/matrix to a black and white image where certain values are white (here, 0 - 127) and the rest to be black (128 - 255). How do I do this? What functions can I use??
1 comentario
Walter Roberson
el 15 de Sept. de 2018
I am confused about whether low values are black as in your first description, or are white as in your second description? Are is the idea that you want the values to be thresholded and you want low values to become white? Or is the idea that you want to threshold and have low value stay low values and high value stay high values (but quantized) but that you want the colormap to switch so that low values are displayed in white and high values are displayed in black even though it was the other way around in the original data?
Respuesta aceptada
Más respuestas (1)
KALYAN ACHARJYA
el 15 de Sept. de 2018
Editada: KALYAN ACHARJYA
el 15 de Sept. de 2018
bw_image=im2bw(gray_image); %By Default here threshold is 0.5
Or
bw_image=im2bw(gray_image,threshold_value);
Choose threshold_value as per your requirements (In between 0 and 1)
Your case: Therefore, a level value of 0.5 corresponds to an intensity value halfway between the minimum and maximum value of the class. (0-127-255), Mid 127, so threshold value 0.5 (By default).
0 comentarios
Ver también
Categorías
Más información sobre White en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!