Function blobFromImages

  • blobFromImages(images, scaleFactor?, size?, mean?, swapRB?, crop?, ddepth?): Mat

  • Creates 4-dimensional blob from series of images. Optionally resizes and crops images from center, subtract mean values, scales values by scalefactor, swap Blue and Red channels.

    if crop is true, input image is resized so one side after resize is equal to corresponding dimension in size and another one is equal or larger. Then, crop from the center is performed. If crop is false, direct resize without cropping and preserving aspect ratio is performed.

    https://docs.opencv.org/4.x/d6/d0f/group__dnn.html#ga0b7b7c3c530b747ef738178835e1e70f

    Parameters

    • images: Mat[]

      input images (all with 1-, 3- or 4-channels).

    • Optional scaleFactor: number
    • Optional size: Size

      spatial size for output image

    • Optional mean: Vec3

      scalar with mean values which are subtracted from channels. Values are intended to be in (mean-R, mean-G, mean-B) order if image has BGR ordering and swapRB is true.

    • Optional swapRB: boolean

      flag which indicates that swap first and last channels in 3-channel image is necessary.

    • Optional crop: boolean

      flag which indicates whether image will be cropped after resize or not

    • Optional ddepth: number

      Depth of output blob. Choose CV_32F or CV_8U.

    Returns Mat

    4-dimensional Mat with NCHW dimensions order.

  • blobFromImages(images, opts): Mat

  • Parameters

    • images: Mat[]
    • opts: {
          crop?: boolean;
          ddepth?: number;
          mean?: Vec3;
          scaleFactor?: number;
          size?: Size;
          swapRB?: boolean;
      }
      • Optional crop?: boolean
      • Optional ddepth?: number
      • Optional mean?: Vec3
      • Optional scaleFactor?: number
      • Optional size?: Size
      • Optional swapRB?: boolean

    Returns Mat

Settings

Member Visibility

Theme