image - 不是JPEG文件:开头为0x0a 0x4c错误

Question

我正在尝试导入一堆.jpeg文件格式的图像。
但是我得到了错误
Not a JPEG file: starts with 0x0a 0x4c
现在，我知道0x89 0x50是.png文件的启动方式。但是我不明白0x0a 0x4c代表什么。

我还在终端上运行了file image001.jpeg命令，它给了我
JPEG image data, JFIF standard 1.01。

另外，当我导入这些图像组时，每次都会针对不同的文件(而不是相同的文件)抛出此错误。因此，我想这不是文件损坏的问题。

如果有帮助，则通过imwrite()的opencv函数生成图像文件并将其保存在硬盘上。

谢谢

使用ImageMagick，获得以下详细输出。

Image: /Users/deathstroke/Desktop/lipRead/VidTIMIT/mwbt0/video/sx383/roi081.jpeg
  Format: JPEG (Joint Photographic Experts Group JFIF format)
  Mime type: image/jpeg
  Class: DirectClass
  Geometry: 68x39+0+0
  Units: Undefined
  Type: TrueColor
  Endianess: Undefined
  Colorspace: sRGB
  Depth: 8-bit
  Channel depth:
    red: 8-bit
    green: 8-bit
    blue: 8-bit
  Channel statistics:
    Pixels: 2652
    Red:
      min: 0 (0)
      max: 223 (0.87451)
      mean: 139.207 (0.54591)
      standard deviation: 44.1822 (0.173263)
      kurtosis: 0.798663
      skewness: -1.01178
      entropy: 0.942718
    Green:
      min: 0 (0)
      max: 159 (0.623529)
      mean: 87.1161 (0.341632)
      standard deviation: 33.4156 (0.131041)
      kurtosis: -0.162594
      skewness: -0.485596
      entropy: 0.955489
    Blue:
      min: 0 (0)
      max: 249 (0.976471)
      mean: 73.9367 (0.289948)
      standard deviation: 43.7079 (0.171403)
      kurtosis: 2.38585
      skewness: 1.43844
      entropy: 0.917047
  Image statistics:
    Overall:
      min: 0 (0)
      max: 249 (0.976471)
      mean: 100.087 (0.392496)
      standard deviation: 40.7392 (0.159761)
      kurtosis: 2.09684
      skewness: 0.445232
      entropy: 0.938418
  Rendering intent: Perceptual
  Gamma: 0.454545
  Chromaticity:
    red primary: (0.64,0.33)
    green primary: (0.3,0.6)
    blue primary: (0.15,0.06)
    white point: (0.3127,0.329)
  Background color: white
  Border color: srgb(223,223,223)
  Matte color: grey74
  Transparent color: black
  Interlace: None
  Intensity: Undefined
  Compose: Over
  Page geometry: 68x39+0+0
  Dispose: Undefined
  Iterations: 0
  Compression: JPEG
  Quality: 95
  Orientation: Undefined
  Properties:
    date:create: 2016-04-15T23:19:32+06:00
    date:modify: 2016-04-15T23:19:32+06:00
    jpeg:colorspace: 2
    jpeg:sampling-factor: 2x2,1x1,1x1
    signature: d3f2c14b57043efd4edbf719dfe769aded504df16c5b9fc8ee436d7551993221
  Artifacts:
    filename: /Users/deathstroke/Desktop/lipRead/VidTIMIT/mwbt0/video/sx383/roi081.jpeg
    verbose: true
  Tainted: False
  Filesize: 1.81KB
  Number pixels: 2.65K
  Pixels per second: 265KB
  User time: 0.000u
  Elapsed time: 0:01.009
  Version: ImageMagick 6.9.3-7 Q16 x86_64 2016-03-27 http://www.imagemagick.org

Answer 1

JPEG流以SOI标记FF D8开始。 JFIF文件后跟一个APP0标记FF E0。

您很有可能在数据中的某处嵌入了有效的JPEG流，并且某些应用程序正在跳过非jpeg数据，直到它们到达SOI标记，而其他应用程序则在抽取无关数据。