我想從tensorflow中使用tf.train.shuffle_batch函數,然後我需要先使用tf.image.decode_jpeg(或其他類似的函數來加載png和jpg)加載圖像。但是我發現圖像被加載爲概率圖,這意味着像素值的最大值爲1,像素值的最小值爲0.下面是我從github回購庫更新的代碼。我不知道爲什麼像素的值被歸一化爲[0,1],並且我沒有找到張量流的相關文檔。任何人都可以幫我嗎?謝謝。爲tf.image.decode_jpeg和tf.train.shuffle_batch規範化了圖像像素值?
def load_examples(self, input_dir, flip, scale_size, batch_size, min_queue_examples):
input_paths = get_image_paths(input_dir)
with tf.name_scope("load_images"):
path_queue = tf.train.string_input_producer(input_paths)
reader = tf.WholeFileReader()
paths, contents = reader.read(path_queue)
# note this is important for truncated images
raw_input = tf.image.decode_jpeg(contents,try_recover_truncated = True, acceptable_fraction=0.5)
raw_input = tf.image.convert_image_dtype(raw_input, dtype=tf.float32)
raw_input.set_shape([None, None, 3])
# break apart image pair and move to range [-1, 1]
width = tf.shape(raw_input)[1] # [height, width, channels]
a_images = preprocess(raw_input[:, :width // 2, :])
b_images = raw_input[:, width // 2:, :]
inputs, targets = [a_images, b_images]
def transform(image):
r = image
r = tf.image.resize_images(r, [self.image_height, self.image_width], method=tf.image.ResizeMethod.AREA)
return r
def transform_gaze(image):
r = image
r = tf.image.resize_images(r, [self.gaze_height, self.gaze_width], method=tf.image.ResizeMethod.AREA)
return r
with tf.name_scope("input_images"):
input_images = transform(inputs)
with tf.name_scope("target_images"):
target_images = transform(targets)
total_image_count = len(input_paths)
# target_images = tf.image.per_image_standardization(target_images)
target_images = target_images[:,:,0]
target_images = tf.expand_dims(target_images, 2)
inputs_batch, targets_batch = tf.train.shuffle_batch([input_images, target_images],
batch_size=batch_size,
num_threads=1,
capacity=min_queue_examples + 3 * batch_size,
min_after_dequeue=min_queue_examples)
# inputs_batch, targets_batch = tf.train.batch([input_images, target_images],batch_size=batch_size)
return inputs_batch, targets_batch, total_image_count
嗨我還有一個問題,我添加輸入數據的圖像摘要,就像這樣:tf.summary.image('training_truth',self.targets,4)它在我看來,在張量板,圖像顯示在[0,255]範圍內。那麼這是否意味着對我的模型的圖像批處理被標準化,而張量板可視化仍然是[0,255]?謝謝 –
是的,圖像彙總檢查輸入類型。如果它是浮動的,那麼它會將這些值縮放到0.255範圍內,以便可視化 – nessuno
太棒了,謝謝你的回答! –