我想从tensorflow中使用tf.train.shuffle_batch函数,然后我需要先使用tf.image.decode_jpeg(或其他类似的函数来加载png和jpg)加载图像。但是我发现图像被加载为概率图,这意味着像素值的最大值为1,像素值的最小值为0.下面是我从github回购库更新的代码。我不知道为什么像素的值被归一化为[0,1],并且我没有找到张量流的相关文档。任何人都可以帮我吗?谢谢。为tf.image.decode_jpeg和tf.train.shuffle_batch规范化了图像像素值?
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
嗨我还有一个问题,我添加输入数据的图像摘要,就像这样:tf.summary.image('training_truth',self.targets,4)它在我看来,在张量板,图像显示在[0,255]范围内。那么这是否意味着对我的模型的图像批处理被标准化,而张量板可视化仍然是[0,255]?谢谢 –
是的,图像汇总检查输入类型。如果它是浮动的,那么它会将这些值缩放到0.255范围内,以便可视化 – nessuno
太棒了,谢谢你的回答! –