Amn = mean (A,1); Amn = imclamp (Amn-mean (Amn,2)); B = A-Amn; imshow (B) You could also restrict your sample region to the lower half of the image:Dear @jepperaskdk, this is the datamatrix, which contain only the number of the processed part. All scale information is lost. You can use the "imflatfield" function of MATLAB for the flat-field correction which can help rectify this. I have an image (attached) containing a rough rod. I was able to divide the grayImage from the background b. 1 1 1. . Learn more about image processing, image analysisCan I convert one image in grayscale to. Load a color image that has vignetting, or darkening of the corners. I was able to divide the grayImage from the background b. I am currently trying to isolate the objects using imgradi. I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. . This has values between 0 and 1 (im2double). I=imcomplement(imflatfield(r. . . . Contrast adjustment is performed on the luminosity layer L* only, and then the image is converted back to the RGB color space. It was recorded between December 1979 and July 1980 and was released on 3 November 1980 by record label 4AD the first full-length release on that label. You have 2,000 characters of MATLAB code to show off your most interesting and beautiful animation. Choose a web site to get translated content where available and see local events and offers. I was able to divide the grayImage from the background b. I am currently trying to isolate the objects using imgradi. Learn more about grayscale, monochrome, background correction, field flattening, background division Image Processing ToolboxI have an x-ray image and need to segment it using k-mean clustering method. Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. I have processed the following image and need to identify the cells- location of cells and the count. , can be defined via PARAM,TABS. Description. To homogenize the brightness of the image blocks so that the false detection rate of tar spot stromata can be minimized, MATLAB built-in function imflatfield() was utilized (Figure 2B). Using imflatfield() directly on the RGB image flattens V in HSV. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. Connect segments in 7-segment digits. Try applying flat-field correction to the entire image. I am trying to find the values of radius along the rod's length. The Imfeld family name was found in the USA, and Canada between 1880 and 1920. I was able to divide the grayImage from the background b. sigma = 25; Iflatfield = imflatfield (I,25); imshow (Iflatfield) title ( [ 'Flat-Field Corrected Image, \sigma = ' ,num2str (sigma)]) The shading defect in the corner is corrected, but the center of the image is too bright and the hand has changed color. I have processed the following image and need to identify the cells- location of cells and the count. . sigma = 25; Iflatfield = imflatfield (I,25); imshow (Iflatfield) title ( [ 'Flat-Field Corrected Image, \sigma = ' ,num2str (sigma)]) The shading defect in the corner is corrected, but the center of the image is too bright and the hand has changed color. Can a. . I have a 2 pic. . 2). I = imread ( 'fabric. Higher limits result in more contrast. Melden Sie sich bei Ihrem MathWorks Konto an; Eigener Account; Mein Community Profil; Lizenz zuordnen; AbmeldenMATALB imflatfield和Python 之间的最大绝对差imflatfield为1。 将完整的MATLAB代码转换为Python： sigma = 30 out2 = imflatfield ( I , sigma ) # Conver out2 to float32 before converting to LAB out2 = out2 . Learn more about imflatfield, digital image processing, gaussian filter . Translating the task to MATLAB is going to be difficult, since basic color adjustment, blending and compositing tools don't exist in base MATLAB or IPT. . First, we flattened the ROI with the MATLAB function imflatfield with radii 20 for the TCB set and radii 10 for the clinical set. For example, instead of performing flattening via a single 'grain extract' blend, we could use multiple techniques and combine them. I was able to divide the grayImage from the background b. However, it's often undesired to simply blur the mask, as that would allow a halo of background content to be included (e. I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. fimplicit (f) plots the implicit function defined by f (x,y) = 0 over the default interval [-5 5] for x and y. I was able to divide the grayImage from the background b. Learn more about imflatfield, digital image processing, gaussian filter . An alternative would be to use imflatfield(). I=imcomplement(imflatfield(r. B = imfilter (A,h,options,…)根据一个或多个指定的选项进行多维滤波。. Can a. I=imcomplement(imflatfield(rgb2gray(imread('well1. Probably close enough to be useful, but not quite exactly the same as what imflatfield () does. I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. I have an x-ray image and need to segment it using k-mean clustering method. I am currently trying to isolate the objects using imgradient but the vignette hinders the ability to distinguish a gradient. What would be a good/ eleg. If I apply corr_img = imflatfield(bad_i. Idiffuseest = imdiffusefilt (Inoisy, 'GradientThreshold',. idea","path":". Once identified, I would like to fill the cells . That is the filter in matlab: imfilter (im2double (image),k,'same','replicate'); That is my kernel k: k = fspecial ('disk',3) The result of this line is a 7x7 matrix with values between 0 - 1. I found the either of following ways give di. I am creating an algorithm that can count in-focus pieces of sand. B = imadjust(B,[0. I am creating an algorithm that can count in-focus pieces of sand. . I would like to have two main clusters, (1) the background in blue color and (2) the circles (bubbles)+ long keyhole sha. Once identified, I would like to fill the cells . MATLAB Flipbook Mini Hack. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. Integral Image. Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; Products; SolutionsToggle Main Navigation. I have a section of code that modifies an image and I want to convert it to Python. The biomedical translational applications of functionalized nanoparticles require comprehensive studies on their effect on human stem cells. It's also worth noting that since V is a poor measure of perceived lightness, the operation doesn't really accomplish much perceived flattening. Toggle Main Navigation. . To avoid this brightening artifact. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. To avoid this brightening artifact. Yes, I assume that is what it does. The resulting image no longer works with the original colormap. I am currently trying to isolate the objects using imgradi. I am currently trying to isolate the objects using imgradi. . Learn more about imflatfield, digital image processing, gaussian filter . A lot of the times people are intent on finding a way to segment an image or find an edge, they actually only have one or two images to process. I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. B = imflatfield(B,40); % try to suppress the glare. 65]); % adjust levels. Brown part should look like as a whole. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. This functionality is available only when the MATLAB engine is available in MEX functions. . fimplicit (f,interval) specifies the plotting interval for x and y. Learn more about imflatfield, digital image processing, gaussian filter . To avoid this brightening artifact. Here, we have tested neat star-shaped mesoporous silica nanoparticles (s-MSN) and their chemically functionalized derivates; we examined nanoparticles (NPs) with similar dimensions but. 3). The compression artifacts are really going to end up being a limiting factor. I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. It corrects image distortion by transforming th. . Learn more about imflatfield, digital image processing, gaussian filter . I have processed the following image and need to identify the cells- location of cells and the count. . I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. A lot of the times people are intent on finding a way to segment an image or find an edge, they actually only have one or two images to process. Toggle Sub Navigation. I am creating an algorithm that can count in-focus pieces of sand. Try applying flat-field correction to the entire image. J = imflatfield(I,sigma) applies flat-field correction to the grayscale or RGB image I. To avoid this brightening artifact. . This functionality is available only when the MATLAB engine is available in MEX functions. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. If I apply corr_img = imflatfield(bad_i. Based on your location, we recommend that you select: . The hand is not a region of interest in the mask, therefore flat-field correction is not applied to pixels in the hand. Try changing the check to x (2,:) and inputting a 2x5 matrix that contains NaN in the second row. I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. . What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. . 3. To call the unsupported function in a MEX, declare the function as an extrinsic in your MATLAB code. Apply Multiple Filters to Integral Image. An alternative would be to use imflatfield(). Contrast enhancement limit, specified as a number in the range [0, 1]. Second, to create a background image to be subtracted from the original image, an opening morphological operation was performed on each image, using a disk of 20-pixel diameter (imopen function implemented in Matlab). Brown part should look like as a whole. (ɪnˈsʌf leɪt, ˈɪn səˌfleɪt) v. I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. The corrected image has more uniform brightness. Can a. Once identified, I would like to fill the cells . I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. The result is darker, but otherwise identical. You can add the code before the implementation of your algorithm and use this output as the "grayImage" in your algorithm. imshow(B) You might be able to clean it up a bit further with some morphological operations. 65]); % adjust levels. . I was able to divide the grayImage from the background b. Integral images are a quick way to represent images for filtering. I wat the item to be inside the background to feel a part of it. a white ring around the basketball). Recherchez dans Answers Effacer les filtres. Learn more about image processing, error, undefined function or variable, mac Image Processing ToolboxI have an x-ray image and need to segment it using k-mean clustering method. Because of this, you will need to reference the name field of the resulting struct to access the filename. Hi i have two images that i want to combine, one of a background and one with an item. cvtColor ( out2 , cv2 . and projections has a value of 367X180 double. . R","contentType":"file"},{"name":"aaa. I have processed the following image and need to identify the cells- location of cells and the count. I was able to divide the grayImage from the background b. MIMT tools are generally dependent on other MIMT tools, so isolating a subset of MIMT tools to. I=imcomplement(imflatfield(r. If I apply corr_img = imflatfield(bad_i. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. . Flat has a value of 367X1 double. I am creating an algorithm that can count in-focus pieces of sand. It's also worth noting that since V is a poor measure of perceived lightness, the operation doesn't really. Note that imfilter is more memory efficient than some other filtering functions in that it outputs an array of the same data type as the input image array. Once identified, I would like to fill the cells . The function bypasses code generation and instead uses the MATLAB engine to execute the call. . If you specify an even-sized kernel h, then the center. I have the Image Processing toolbox on my computer. Hello, everyone, I want to make an application just like camScanner which lets the user to select the corners of the object and then straights the image according to those corners in such a way tha. I have processed the following image and need to identify the cells- location of cells and the count. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. If I apply corr_img = imflatfield(bad_i. 4 0. This can be implemented as follows: % Read the raw image. . imflatfield: 2-D image flat-field correction: imlocalbrighten: Brighten low-light image (Since R2019b) imreducehaze: Reduce atmospheric haze: locallapfilt: Fast local Laplacian filtering of images: localcontrast: Edge-aware local contrast manipulation of images: localtonemap: Render HDR image for viewing while enhancing local contrast: histeqThe biomedical translational applications of functionalized nanoparticles require comprehensive studies on their effect on human stem cells. To call the unsupported function in a MEX, declare the function as an extrinsic in your MATLAB code. . I have processed the following image and need to identify the cells- location of cells and the count. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. correlate and scipy. Toggle Main Navigation. I found that following gives same result as MATLAB: import scipy. The 'grain extract' method has weakness in some of the dark regions, whereas other regions tend to cause problems for the division used by imflatfield(). I am currently trying to isolate the objects using imgradi. This MATLAB function applies flat-field correction to the grayscale or RGB image I. . I am currently trying to isolate the objects using imgradi. You signed in with another tab or window. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. All scale information is lost. . Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. I=imcomplement(imflatfield(r. . I am trying to find the values of radius along the rod's length. I was able to divide the grayImage from the background b. To homogenize the brightness of the image blocks so that the false detection rate of tar spot stromata can be minimized, MATLAB built-in function imflatfield() was utilized (Figure 2B). A = im2single (A); % non-double images are converted to single. I found the either of following ways give di. Try applying flat-field correction to the entire image. Once identified, I would like to fill the cells . My original image is RGB image and the image processing for my project is done on grayscale image. My major issue has been counting in-focus pieces of sand in the vignette. The resulting image no longer works with the original colormap. Load a color image that has vignetting, or darkening of the corners. Can a. . . Brown part should look like as a whole. Answers. This can be implemented as follows: % Read the raw image. 2 Illumination and imaging. Can a. . I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. imflatfield: 2-D image flat-field correction: imlocalbrighten: Brighten low-light image (Since R2019b) imreducehaze: Reduce atmospheric haze: locallapfilt: Fast local Laplacian filtering of images: localcontrast: Edge-aware local contrast manipulation of images: localtonemap: Render HDR image for viewing while enhancing local contrast: histeq Description. My major issue has been counting in-focus pieces of sand in the vignette. The immediate issue is because the variable, VideoInfo (returned from dir) is a struct not a cell array of strings. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. Answers. Based on your location, we recommend that you select: . Choose a web site to get translated content where available and see local events and offers. It cancels the artefacts caused by variations in the pixel-to-pixel sensitivity of the detector and by distortions in the optical path. . . Thanks in advance. Contribute to yoshikisd/P3B-Auto-Aligner development by creating an account on GitHub. You can specify the range of the input and output values. Can a. I have processed the following image and need to identify the cells- location of cells and the count. filteredRGB = imfilter (originalRGB, h); figure, imshow (filteredRGB)To homogenize the brightness of the image blocks so that the false detection rate of tar spot stromata can be minimized, MATLAB built-in function imflatfield() was utilized . To avoid this brightening artifact. J = imflatfield(I,sigma) applies flat-field correction to the grayscale or RGB image I. The equivalent function of Matlab imfilter in Python. I have processed the following image and need to identify the cells- location of cells and the count. Project: In X-ray imaging, the acquired projection images generally suffer from fixed-pattern noise, which is one of the limiting factors of image quality. . Learn more about imflatfield, digital image processing, gaussian filter What formula does the imflatfield function use when used with a matrix as input?Taking the averages of the pixel intensities of the images If requested, doing a 2D Gaussian fit Normalizing, so that the maximum of the Gaussian or of the average image (if on Gaussian fit was performed) equals 1. Toggle Main Navigation. I am currently trying to isolate the objects using imgradi. My major issue has been counting in-focus pieces of sand in the vignette. {"payload":{"allShortcutsEnabled":false,"fileTree":{"R":{"items":[{"name":"RcppExports. . My major issue has been counting in-focus pieces of sand in the vignette. Learn more about imflatfield, digital image processing, gaussian filter What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. sigma = 25; Iflatfield = imflatfield (I,25); imshow (Iflatfield) title ( [ 'Flat-Field Corrected Image, \sigma = ' ,num2str (sigma)]) The shading defect in the corner is corrected, but the center of the image is too bright and the hand has changed color. It's also worth noting that since V is a poor measure of perceived lightness, the operation doesn't really accomplish much perceived flattening. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. J = imflatfield(I,sigma) applies flat-field correction to the grayscale or RGB image I. Learn more about imflatfield, digital image processing, gaussian filter . . You can confirm this sequence using edit command. Any suggestions would be greatly appreciated. . The most Imfeld families were found in USA in 1920. . Use cv2. The resulting image no longer works with the original colormap. I am currently trying to isolate the objects using imgradi. If I apply corr_img = imflatfield(bad_i. Moreover, to prevent false-positive detections, such as the salt-and-pepper noises, MATLAB built-in function imgaussfilt() was used to apply the Gaussian filter. A valid ROI has these characteristics: Topographically flat Spectrally flat (uniform spectral response) Taking the averages of the pixel intensities of the images If requested, doing a 2D Gaussian fit Normalizing, so that the maximum of the Gaussian or of the average image (if on Gaussian fit was performed) equals 1. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. Once identified, I would like to fill the cells . I=imcomplement(imflatfield(r. Learn more about imflatfield, digital image processing, gaussian filter What formula does the imflatfield function use when used with a matrix as input? correctedData = flatField (inputData,roi) applies flat field correction to the hyperspectral data, inputData , using the flat field mean spectrum calculated in the specified region of interest (ROI) of the hyperspectral data. Ultimately, I have to ask what the goal is here. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. You have two options: 1) values should. r","path":"R/aaa. still has shading distortions. If I apply corr_img = imflatfield(bad_i. Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; Products; SolutionsI am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. I am doing research where my goal is to remove out of focus particles of sand, and count in focus particles of sand that I capture in lab. Specify the axes as the first input argument, prior to any of. What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. 4 0. Cambiar a Navegación Principal. C = imflatfield(A,30);How does imflatfield work?. The corrected image has more uniform. The resulting image no longer works with the original colormap. The function bypasses code generation and instead uses the MATLAB engine to execute the call. If I apply corr_img = imflatfield(bad_i. An alternative would be to use imflatfield(). I have an image (attached) containing a rough rod. Try applying flat-field correction to the entire image. If I apply corr_img = imflatfield(bad_i. Automatic detection of flying drones is a key issue where its presence, specially if unauthorized, can create risky situations or compromise security. Once identified, I would like to fill the cells . g. The definition of almost-sure boundedness, or essential boundedness is the following (see also this definition ): Y: (Ω,F,P) → R Y: ( Ω, F, P) → R is an essentially bounded random variable if there is a M ≥ 0 M ≥ 0 so that P[|X| > M] = 0 P [ | X | > M] = 0, i. Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. B = imflatfield(B,40); % try to suppress the glare. Select a Web Site. Once identified, I would like to fill the cells . I=imcomplement(imflatfield(r. I am currently trying to isolate the objects using imgradient but the vignette hinders the ability to distinguish a gradient. This would be essentially identical, except the result would be scaled by the mean of the background estimate instead of being normalized as with mat2gray(). New Jersey had. . Recently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. . Once identified, I would like to fill the cells . . Try applying flat-field correction to the entire image. Meaning of flatfield. correctedData = flatField (inputData,roi) applies flat field correction to the hyperspectral data, inputData , using the flat field mean spectrum calculated in the specified region of interest (ROI) of the hyperspectral data. So the filter gets an input image. . example J = imbilatfilt (I,degreeOfSmoothing) specifies the amount of smoothing. . B = imadjust(B,[0. Look at what others have done and leverage what you see to make something unique. 我们可以从应用imflatfield（2-D图像平场校正）开始，然后应用降噪和锐化。 请注意，建议的解决方案不能保证改善条形码检测，也不能保证适用于所有图像。 建议阶段： 应用2-D图像平场校正。 我们可以使用我的following answer中的Python实现。 J = imflatfield(I,sigma) applies flat-field correction to the grayscale or RGB image I. imflatfield: 2-D image flat-field correction: imlocalbrighten: Brighten low-light image （自 R2019b 起） imreducehaze: Reduce atmospheric haze: locallapfilt: Fast local Laplacian filtering of images: localcontrast: Edge-aware local contrast manipulation of images: localtonemap: Render HDR image for viewing while enhancing local contrast: histeqHow does imflatfield work?. I was able to divide the grayImage from the background b. Learn more about 7-segment, connect regions, remove gaps, fill gap, join regions, join digit segments MATLAB, Image Processing ToolboxI have processed the following image and need to identify the cells- location of cells and the count. Can a. correlate(A, B, mode='constant'). I did some pre-processing and those were Converted the Image to grayscale S. This would be essentially identical, except the result would be scaled by the mean of the background estimate instead of being normalized as with mat2gray(). . How I can remove these red rectangles by using a Matlab code?imfilter函数imfilter函数是对图像进行滤波的函数，matlab语句格式为：B = imfilter (A,h)，使用多维滤波器hhh对多维数组AAA进行滤波，并在BBB中返回结果。. Can I convert one image in grayscale to. 05 for the TCB set and 0. Toggle Main Navigation. Filter and subtract - filter image and subtract the result from the unfiltered image. 0 or in the case of single molecule data by fitting a. Theme. . to blow (air or a medicinal substance) into some opening or upon some part of the body. . What formula does the imflatfield function use when used with a matrix as input? For example, I have an image of surface temperature (attached) = bad_img. This git repo is created to control version of AI-innovate Dental Imaging Project and make project management - AI-innovate-Dental-Imaging/PreProcessing. Copy. sigma = 25; Iflatfield = imflatfield (I,25); imshow (Iflatfield) title ( [ 'Flat-Field Corrected Image, \sigma = ' ,num2str (sigma)]) The shading defect in the corner is corrected, but the center of the image is too bright and the hand has changed color. J = imflatfield(I,sigma) はフラットフィールド補正をグレースケール イメージまたは RGB イメージ I に適用します。 この補正は、標準偏差が sigma のガウス平滑化を使用して I のシェーディング成分を近似します。 補正後のイメージが J に返されます。Smart Living Transform Your Home with These Cutting-Edge GadgetsRecently i took this picture with a thermocamera, the color of the background should be homogeneus and more or less similir to the one in the center (red/orange), but on the corners of the picture. If I apply corr_img = imflatfield(bad_i. I was able to divide the grayImage from the background b. Brown part should look like as a whole. Perform the flat-field correction on the background of the image using the mask maskBackground. Once identified, I would like to fill the cells . Based on the input temperature units, the absolute temperature scale factor, T abs. Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; Products; SolutionsI have an x-ray image and need to segment it using k-mean clustering method. imshow(B) You might be able to clean it up a bit further with some morphological operations. . Haupt-Navigation ein-/ausblenden. Can a. . fimplicit (ax, ___) plots into the axes specified by ax instead of into the current axes. If I apply corr_img = imflatfield(bad_i. Manipulating luminosity affects the. Toggle Main Navigation. I was able to divide the grayImage from the background b. . I need to do a project that can identify the position and orientation of object on the conveyor so that the object will be in a right position/posture before being grab by the robotic arm. Learn more about imflatfield, digital image processing, gaussian filter . Select a Web Site. How does imflatfield work?. The imfilter function computes the value of each output pixel using double-precision, floating-point arithmetic. The correction uses Gaussian smoothing with a standard deviation of sigma to approximate the shading component of I. The true radius at the edge of the rod is known to me. The result is darker, but otherwise identical. C = imflatfield(A,30);Using imflatfield() directly on the RGB image flattens V in HSV. Look at what others have done and leverage what you see to make something unique. The corrected image is returned in J. Imflatfield June 06, 2022 Post a Comment It may be given more than once in a single im_file module instance. If I apply corr_img = imflatfield(bad_i.