create Facerecognition dataset [closed]

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I have created facerecognition sample(javacv) where i can detect and save images of faces real time. when i tried to recognize this faces again that time got this error: OpenCV Error: Unsupported format or combination of formats (In the Eigenfaces method all input samples (training images) must be of equal size! Expected 26896 pixels, but was 26244 pixels.) in cv::face::Eigenfaces::train, file

is there any way where i can use this images for recognition(or training)

how can i make all captured images with same size and pixel Highgui.imwrite(String.valueOf(System.currentTimeMillis()) + ".jpg", faceImage); am using above statment to save detectd faces.

how can i convert captured images in to dataset