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    Function blobFromImage

    • Creates 4-dimensional blob from image. Optionally resizes and crops image 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#ga29f34df9376379a603acd8df581ac8d7

      Parameters

      • image: Mat
      • OptionalscaleFactor: number
      • Optionalsize: Size
      • Optionalmean: Vec3
      • OptionalswapRB: boolean
      • Optionalcrop: boolean
      • Optionalddepth: number

      Returns Mat

      4-dimensional Mat with NCHW dimensions order.

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

      scalefactor multiplier for image values.

      size spatial size for output image

      mean 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.

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

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

      ddepth Depth of output blob. Choose CV_32F or CV_8U.

    • Creates 4-dimensional blob from image. Optionally resizes and crops image 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#ga29f34df9376379a603acd8df581ac8d7

      Parameters

      • image: Mat
      • opts: {
            crop?: boolean;
            ddepth?: number;
            mean?: Vec3;
            scaleFactor?: number;
            size?: Size;
            swapRB?: boolean;
        }

      Returns Mat

      4-dimensional Mat with NCHW dimensions order.

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

      scalefactor multiplier for image values.

      size spatial size for output image

      mean 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.

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

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

      ddepth Depth of output blob. Choose CV_32F or CV_8U.

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