How can you identify two black points in an white background
in [Matlab]
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From: Siddharth Magazine on 8 Jun 2010 22:59 Yes..that is similar to what i was referring too. Once i have got the image acquired, with two points in the image, i would like to identify the two points with a "+" symbol or "*" symbol. Thanks for your response on my question. It seems like i am on the right track now. Also, if you could help me drawing a line between the two black points in the same image and calculating the distane between them using matlab codes, that would be great. So far, i can calculate the distance between the pixels of the two black points in the image manually, but i need to calculate the distance between the two black points automatically in pixels, if possible. Please help me on that too asap. Thanks. ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <22ee7549-ceea-49a0-b38b-d4d5d27a6def(a)c10g2000yqi.googlegroups.com>... > You mean like putting crosshairs over them?: > > % Read in standard MATLAB grayscale demo image. > grayImage = imread('cameraman.tif'); > imshow(grayImage, []); > title('Original Grayscale Image'); > set(gcf, 'Position', get(0,'Screensize')); % Enlarge figure to full > screen. > > x1 = 115; > y1 = 50; > hold on; % Prevent image from getting blown away when we plot. > plot(x1, y1, 'r+', 'MarkerSize', 30); > > x2 = 70; > y2 = 150; > plot(x2, y2, 'r+', 'MarkerSize', 30);
From: ImageAnalyst on 9 Jun 2010 07:26 Just use the line() command to draw the line, and use hypot() to calculate the distance using the Pythagorean Theorem.
From: Siddharth Magazine on 10 Jun 2010 06:52
Thanks a lot for your response. It was really helpful. ImageAnalyst <imageanalyst(a)mailinator.com> wrote in message <f4f8e6f0-d31a-4056-bcc6-84e00c18cdde(a)r27g2000yqb.googlegroups.com>... > Just use the line() command to draw the line, and use hypot() to > calculate the distance using the Pythagorean Theorem. |