How to apply a Color Thresholder function in Image Batch Processor
How to apply a Color Thresholder function in Image Batch Processor to get masked RGB Images instead of binary ones? function [BW,maskedRGBImage] = createMask(RGB) %createMask Threshold RGB image using auto-generated code from colorThresholder app. % [BW,MASKEDRGBIMAGE] = createMask(RGB) thresholds image RGB using % auto-generated code from the colorThresholder app. The colorspace and % range for each channel of the colorspace were set within the app. The % segmentation mask is returned in BW, and a composite of the mask and % original RGB images is returned in maskedRGBImage. % Auto-generated by colorThresholder app on 07-Oct-2021 %------------------------------------------------------ % Convert RGB image to chosen color space I = RGB; % Define thresholds for channel 1 based on histogram settings channel1Min = 23.000; channel1Max = 80.000; % Define thresholds for channel 2 based on histogram settings channel2Min = 33.000; channel2Max = 84.000; % Define thresholds for channel 3 based on histogram settings channel3Min = 0.000; channel3Max = 34.000; % Create mask based on chosen histogram thresholds sliderBW = (I(:,:,1) >= channel1Min ) & (I(:,:,1) <= channel1Max) & ... (I(:,:,2) >= channel2Min ) & (I(:,:,2) <= channel2Max) & ... (I(:,:,3) >= channel3Min ) & (I(:,:,3) <= channel3Max); BW = sliderBW; % Initialize output masked image based on input image. maskedRGBImage = RGB; % Set background pixels where BW is false to zero. maskedRGBImage(repmat(~BW,[1 1 3])) = 0; end However, when I apply this function for a batch of images in Image batch processor, I'm only getting the binary masks (the selected objects are white and a black background) as outputs. Can you tell me how to get the objects in my image batch as RGB with black background?
John Williams answered .
2025-11-20
folder = pwd; % Whatever.
filePattern = fullfile(folder, '*.webp');
fileList = dir(filePattern);
for k = 1 : numImages
% Read in original image
thisFileName = fullfile(fileList(k).folder, fileList(k).name);
fprintf('Reading "%s".\n', thisFileName);
rgbImage = imread(thisFileName);
% Do color segmentation.
[mask, maskedRGBImage] = createMask(rgbImage);
% Now display the three images
subplot(2, 2, 1);
imshow(rgbImage)
subplot(2, 2, 2);
imshow(mask);
subplot(2, 2, 3);
imshow(maskedRGBImage);
drawnow;
end
Or if you're using the batch processing app, maybe it's using only the first output. Try reversing the outputs:
function [maskedRGBImage, BW] = createMask(RGB)