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2 Intel ® Integrated Performance <strong>Primitives</strong> Developer Reference, Volume 2: Image Processing The scale factor can be negative, positive, or zero. Scaling is applied because internal computations are generally performed with a higher precision than the data types used for input and output images. NOTE The result of integer operations is always saturated to the destination data type range even when scaling is used. The scaling of an integer result is done by multiplying the output pixel values by 2 -scaleFactor before the function returns. This helps retain either the output data range or its precision. Usually the scaling with a positive factor is performed by the shift operation. The result is rounded off to the nearest even integer number (see Rounding Mode). For example, the integer Ipp16s result of the square operation ippiSqr for the input value 200 is equal to 32767 instead of 40000, that is, the result is saturated and the exact value cannot be restored. The scaling of the output value with the factor scaleFactor = 1 yields the result 20000, which is not saturated, and the exact value can be restored as 20000*2. Thus, the output data range is retained. The following example shows how the precision can be partially retained by means of scaling. The integer square root operation ippiSqr (without scaling) for the input value 2 gives the result equal to 1 instead of 1.414. Scaling of the internally computed output value with the factor scaleFactor = -3 gives the result 11, and permits the more precise value to be restored as 11*2 -3 = 1.375. Error Reporting The Intel IPP functions return status codes of the performed operation to report errors and warnings to the calling program. Thus, it is up to the application to perform error-related actions and/or recover from the error. The last value of the error status is not stored, and the user is to decide whether to check it or not as the function returns. The status codes are of IppStatus type and are global constant integers. The status codes and corresponding messages reported by Intel IPP for image and video processing are listed in Table . Status Codes and Messages Status Code Message ippStsNotSupportedModeErr The requested mode is currently not supported. ippStsDecimateFractionErr Unsupported fraction in decimate. ippStsWeightErr Incorrect value for weight. ippStsQualityIndexErr Quality Index cannot be calculated for an image filled with a constant. ippStsResizeNoOperationErr One of the output image dimensions is less than 1 pixel. ippStsBlockStepErr Step for Block is less than 8. ippStsMBStepErr Step for MB is less than 16. ippStsNoiseRangeErr Noise value for Wiener Filter is out of range. ippStsLPCCalcErr Cannot evaluate linear prediction. ippStsJPEG2KBadPassNumber Pass number exceeds the limits of [0,nOfPasses-1]. ippStsJPEG2KDamagedCodeBlock Codeblock for decoding is damaged. ippStsH263CBPYCodeErr Illegal Huffman code is detected during CBPY stream processing. ippStsH263MCBPCInterCodeErr Illegal Huffman code is detected during MCBPC Inter stream processing. ippStsH263MCBPCIntraCodeErr Illegal Huffman code is detected during MCBPC Intra stream processing. ippStsNotEvenStepErr Step value is not pixel multiple. ippStsHistoNofLevelsErr Number of levels for histogram is less than 2. ippStsLUTNofLevelsErr Number of levels for LUT is less than 2. ippStsMP4BitOffsetErr Incorrect value for bit offset. ippStsMP4QPErr Incorrect value for quantization parameter. ippStsMP4BlockIdxErr Incorrect value for block index. 28
Status Code Message Intel ® Integrated Performance <strong>Primitives</strong> Concepts 2 ippStsMP4BlockTypeErr Incorrect block type. ippStsMP4MVCodeErr Illegal Huffman code is detected during MV stream processing. ippStsMP4VLCCodeErr Illegal Huffman code is detected during VLC stream processing. ippStsMP4DCCodeErr Illegal code is detected during DC stream processing. ippStsMP4FcodeErr Incorrect value for fcode. ippStsMP4AlignErr Incorrect buffer alignment. ippStsMP4TempDiffErr Incorrect temporal difference. ippStsMP4BlockSizeErr Incorrect size of block or macroblock. ippStsMP4ZeroBABErr All BAB values are equal to zero. ippStsMP4PredDirErr Incorrect prediction direction. ippStsMP4BitsPerPixelErr Incorrect number of bits per pixel. ippStsMP4VideoCompModeErr Incorrect video component mode. ippStsMP4LinearModeErr Incorrect DC linear mode. ippStsH263PredModeErr Incorrect value for Prediction Mode. ippStsH263BlockStepErr The step value is less than 8. ippStsH263MBStepErr The step value is less than 16. ippStsH263FrameWidthErr The frame width is less than 8. ippStsH263FrameHeightErr The frame height is less than, or equal to zero. ippStsH263ExpandPelsErr The expand pixels number is less than 8. ippStsH263PlaneStepErr Step value is less than the plane width. ippStsH263QuantErr Quantizer value is less than, or equal to zero, or more than 31. ippStsH263MVCodeErr Illegal Huffman code is detetcted during MV stream processing. ippStsH263VLCCodeErr Illegal Huffman code is detetcted during VLC stream processing. ippStsH263DCCodeErr Illegal code is detetcted during DC stream processing. ippStsH263ZigzagLenErr Zigzag compact length is more than 64. ippStsJPEGHuffTableErr JPEG Huffman table is destroyed. ippStsJPEGDCTRangeErr JPEG DCT coefficient is out of range. ippStsJPEGOutOfBufErr An attempt to access out of the buffer. ippStsChannelOrderErr Incorrect order of the destination channels. ippStsZeroMaskValueErr All values of the mask are equal to zero. ippStsRangeErr Incorrect values for bounds: the lower bound is greater than the upper bound. ippStsQPErr Incorrect value for a quantizer parameter. ippStsQuadErr The quadrangle is nonconvex or degenerates into triangle, line, or point. ippStsRectErr Size of the rectangular region is less than, or equal to 1. ippStsCoeffErr Incorrect values for the transformation coefficients. ippStsNoiseValErr Incorrect value for the noise amplitude for dithering. ippStsDitherLevelsErr Number of dithering levels is out of range. ippStsNumChannelsErr Incorrect or unsupported number of channels. ippStsDataTypeErr Incorrect or unsupported data type. ippStsCOIErr COI is out of range. ippStsOutOfRangeErr Argument is out of range or point is outside the image. ippStsDivisorErr Divisor is equal to zero, function is aborted. ippStsAlphaTypeErr Illegal type of image composition operation. ippStsGammaRangeErr Gamma range bound is less than, or equal to zero. ippStsGrayCoefSumErr Sum of the conversion coefficients must be less than, or equal to 1. ippStsChannelErr Illegal channel number. ippStsJaehneErr Magnitude value is negative. ippStsStepErr Step value is less than, or equal to zero. ippStsStrideErr Stride value is less than the row length. 29
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