An image output method for an image capturing device, the image output method comprising the steps of: capturing a first test image at a first time point and a second test image at a second time point; and calculating a first image feature value of the first test image and a second image feature value of the second test image; characterized in that the image output method further comprises the steps of: determining whether to output images generated by the image capturing device according to the first image feature value of the first test image and the second image feature value of the second test image, comprising: calculating an image difference value of the first image feature value and the second image feature value, where the first image feature value of the first test image is associated with a brightness value of the first test image and the second image feature value of the second test image is associated with a brightness value of the second test image; and comparing the image difference value with a threshold value, and outputting the images generated by image capturing device when the image difference value is greater than the threshold value. capturing a first test image at a first time point and a second test image at a second time point; and calculating a first image feature value of the first test image and a second image feature value of the second test image; characterized in that the image output method further comprises the steps of: determining whether to output images generated by the image capturing device according to the first image feature value of the first test image and the second image feature value of the second test image, comprising: calculating an image difference value of the first image feature value and the second image feature value, where the first image feature value of the first test image is associated with a brightness value of the first test image and the second image feature value of the second test image is associated with a brightness value of the second test image; and comparing the image difference value with a threshold value, and outputting the images generated by image capturing device when the image difference value is greater than the threshold value. determining whether to output images generated by the image capturing device according to the first image feature value of the first test image and the second image feature value of the second test image, comprising: calculating an image difference value of the first image feature value and the second image feature value, where the first image feature value of the first test image is associated with a brightness value of the first test image and the second image feature value of the second test image is associated with a brightness value of the second test image; and comparing the image difference value with a threshold value, and outputting the images generated by image capturing device when the image difference value is greater than the threshold value. calculating an image difference value of the first image feature value and the second image feature value, where the first image feature value of the first test image is associated with a brightness value of the first test image and the second image feature value of the second test image is associated with a brightness value of the second test image; and comparing the image difference value with a threshold value, and outputting the images generated by image capturing device when the image difference value is greater than the threshold value.