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[Windows Develop] a DL : 0: NAME: bpass PURPOSE: Implements a real-space bandpass filter which suppress pixel noise and long-wavelength image variations while retaining information of a characteristic size. CATEGORY: Image Processing CALLING SEQUENCE: res = bpass( image, lnoise, lobject ) INPUTS: image: The two-dimensional array to be filtered. lnoise: Characteristic lengthscale of noise in pixels. Additive noise averaged over this length should vanish. MAy assume any positive floating value. lobject: A length in pixels somewhat larger than a typical object. Must be an odd valued integer. OUTPUTS: res: filtered image. PROCEDURE: simple wavelet convolution yields spatial bandpass filtering. NOTES:-NAME: bpass PURPOSE: Implements a real-space bandpass filter which suppress pixel noise and long-wavelength image variations while retaining information of a characteristic size. CATEGORY: Image Processing CALLING SEQUENCE: res = bpass( image, lnoise, lobject ) INPUTS: image: The two-dimensional array to be filtered. lnoise: Characteristic lengthscale of noise in pixels. Additive noise averaged over this length should vanish. MAy assume any positive floating value. lobject: A length in pixels somewhat larger than a typical object. Must be an odd valued integer. OUTPUTS: res: filtered image. PROCEDURE: simple wavelet convolution yields spatial bandpass filtering. NOTES:
Date : 2026-01-10 Size : 2kb User : santhu
[Windows Develop] b DL : 0: cntrd: calculates the centroid of bright spots to sub-pixel accuracy. Inspired by Grier & Crocker s feature for IDL, but greatly simplified and optimized for matlab INPUTS: im: image to process, particle should be bright spots on dark background with little noise ofen an bandpass filtered brightfield image or a nice fluorescent image mx: locations of local maxima to pixel-level accuracy from pkfnd.m sz: diamter of the window over which to average to calculate the centroid. should be big enough to capture the whole particle but not so big that it captures others. if initial guess of center (from pkfnd) is far from the centroid, the window will need to be larger than the particle size. RECCOMMENDED size is the long lengthscale used in bpass plus 2. interactive: OPTIONAL INPUT set this variable to one and it will show you the image used to calculate each centroid, the pixel-level peak and the centroid- cntrd: calculates the centroid of bright spots to sub-pixel accuracy. Inspired by Grier & Crocker s feature for IDL, but greatly simplified and optimized for matlab INPUTS: im: image to process, particle should be bright spots on dark background with little noise ofen an bandpass filtered brightfield image or a nice fluorescent image mx: locations of local maxima to pixel-level accuracy from pkfnd.m sz: diamter of the window over which to average to calculate the centroid. should be big enough to capture the whole particle but not so big that it captures others. if initial guess of center (from pkfnd) is far from the centroid, the window will need to be larger than the particle size. RECCOMMENDED size is the long lengthscale used in bpass plus 2. interactive: OPTIONAL INPUT set this variable to one and it will show you the image used to calculate each centroid, the pixel-level peak and the centroid
Date : 2026-01-10 Size : 2kb User : santhu